98-29307. Final NPDES General Permit for New and Existing Sources and New Dischargers in the Offshore Subcategory of the Oil and Gas Extraction Category for the Western Portion of the Outer Continental Shelf of the Gulf of Mexico (GMG290000)  

  • [Federal Register Volume 63, Number 211 (Monday, November 2, 1998)]
    [Notices]
    [Pages 58722-58738]
    From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
    [FR Doc No: 98-29307]
    
    
    -----------------------------------------------------------------------
    
    ENVIRONMENTAL PROTECTION AGENCY
    
    [FRL-6182-7]
    
    
    Final NPDES General Permit for New and Existing Sources and New 
    Dischargers in the Offshore Subcategory of the Oil and Gas Extraction 
    Category for the Western Portion of the Outer Continental Shelf of the 
    Gulf of Mexico (GMG290000)
    
    AGENCY: Environmental Protection Agency (EPA).
    
    ACTION: Notice of Final NPDES General Permit.
    
    -----------------------------------------------------------------------
    
    SUMMARY: EPA Region 6 today issues in part the National Pollutant 
    Discharge
    
    [[Page 58723]]
    
    Elimination System (NPDES) general permit for the Western Portion of 
    the Outer Continental Shelf of the Gulf of Mexico (No. GMG290000) for 
    discharges from new sources, existing sources, and new dischargers in 
    the Offshore Subcategory of the Oil and Gas Extraction Point Source 
    Category (40 CFR part 435, subpart A). The existing permit published in 
    the Federal Register at 61 FR 41609 on August 9, 1996 authorized 
    discharges from exploration, development, and production facilities 
    located in and discharging to Federal waters of the Gulf of Mexico 
    seaward of the outer boundary of the territorial seas offshore off 
    Louisiana and Texas. The discharge of produced water to that portion of 
    the Outer Continental Shelf from Offshore Subcategory facilities 
    located in the territorial seas off Louisiana and Texas was also 
    authorized by that permit.
    
    FOR FURTHER INFORMATION CONTACT: Ms. Wilma Turner, EPA Region 6, 1445 
    Ross Avenue, Dallas, Texas 75202, Telephone: (214) 665 7516, or via 
    EMAIL to the following address: turner.wilma@epamail.epa.gov
    
    SUPPLEMENTAL INFORMATION:
    
    Regulated Entities
    
        Entities potentially regulated by this action are those which 
    operate offshore oil and gas extraction facilities located in the Outer 
    Continental Shelf Offshore of Louisiana and Texas.
    
    ------------------------------------------------------------------------
                                                    Examples of regulated
                     Category                             entities
    ------------------------------------------------------------------------
    Industry..................................  Offshore Oil and Gas
                                                 Extraction Platforms.
    ------------------------------------------------------------------------
    
        This table lists the types of entities that EPA is now aware could 
    potentially be regulated by this action. Other types of entities not 
    listed in the table could also be regulated. To determine whether your 
    [facility, company, business, organization, etc.] is regulated by this 
    action, you should carefully examine the applicability criteria in part 
    I, section A.1. of the general permit. If you have questions regarding 
    the applicability of this action to a particular entity, consult the 
    person listed in the preceding FOR FURTHER INFORMATION CONTACT section.
        Pursuant to section 402 of the Clean Water Act (CWA), 33 U.S.C. 
    1342, EPA proposed and solicited comments on NPDES general permit 
    GMG290000 at 63 FR 2238 (January 14, 1998). Notice of this proposed 
    permit was also published in the New Orleans Times Picayune on January 
    24, 1998. The comment period closed on March 16, 1998.
        Region 6 received comments from the Offshore Operators Committee, 
    American Petroleum Institute, Willie R. Taylor--United States 
    Department of Interior, Shell Offshore, Inc., BP Exploration, Inc., and 
    Exxon Company, U.S.A.
        EPA Region 6 has considered all comments received. In response to 
    those comments, the final decision to authorize the discharge of 
    produced water is being postponed and will not be made at this time; 
    however, all other discharges which were proposed are being authorized 
    by the permit issued today. Due to the complexity of comments regarding 
    produced water discharges, the Region could not adequately respond and 
    issue the permit in a timely manner. A final decision on produced water 
    discharges will be issued as soon as the Region can adequately respond 
    to the related comments.
        One of the comments concerning the produced water toxicity 
    requirements raised the same issue with respect to the toxicity 
    requirements for seawater and freshwater to which treatment chemicals 
    have been added. That issue concerns Version 3.20 of CORMIX, the 
    computer model which was used to calculate the proposed permit's 
    toxicity limits. The Region is, nevertheless, authorizing in today's 
    permit the discharge of freshwater and seawater to which treatment 
    chemicals have been added with the limits as stated in the proposed 
    permit. The Region has decided to go forward with the limits for 
    discharges of freshwater and seawater to which treatment chemicals have 
    been added for a number of reasons. First, the Region believes these 
    limits are technically defensible and reasonable. The Region also 
    recognizes an environmental need to issue standards for the discharge 
    of freshwater and seawater to which treatment chemicals have been 
    added, because such discharges are not currently authorized. Finally, 
    if modifications to the limits are warranted after further review and 
    analysis of the CORMIX computer model, the Region expects to make such 
    modifications in the near future.
        The Offshore Operators Committee (OOC) has indicated its support of 
    the Region's approach, since a number of their members indicated a 
    desire to discharge those waste streams as soon as possible. The OOC 
    has stated they have no objection to including in today's permit of all 
    of the proposed effluent limits for the freshwater and seawater to 
    which treatment chemicals have been added, with the understanding that 
    (1) when the Agency develops the second phase of the permit; i.e., 
    authorizes the discharge of produced water, it will investigate all 
    issues raised in OOC's comments regarding the use of the dispersion 
    model used to derive the toxicity limits, and (2) if the Agency 
    determines the model is inappropriate, it will modify the associated 
    limits as a part of issuance of the second phase of the permit.
        In response to other comments received, only minor changes in the 
    permit's wording were made in the final permit. A copy of the Response 
    to Comments may be obtained from Wilma Turner at the address listed 
    above.
    
    Other Legal Requirements
    
    Ocean Discharge Criteria Evaluation
    
        At 63 FR 2238, EPA Region 6 determined that discharges in 
    compliance with the proposed general permit for the Western Gulf of 
    Mexico Outer Continental Shelf general permit (GMG290000) would not 
    cause unreasonable degradation of the marine environment. No comments 
    have been received which disagree with that determination.
    
    Coastal Zone Management Act
    
        The Region found the proposed general permit consistent with 
    approved Coastal Zone Management Plans for Louisiana and Texas and 
    submitted those determinations to the appropriate State agencies for 
    certification. Such certification was received from the Coastal 
    Management Division of the Louisiana Department of Natural Resources. 
    However, the Texas General Land Office informed EPA that this action is 
    not subject to their consistency review, since the area covered under 
    the permit is outside the Texas Coastal Management Program's boundary.
    
    Marine Protection, Research, and Sanctuaries Act
    
        The Marine Protection, Research and Sanctuaries Act (MPRSA) of 1972 
    regulates the dumping of all types of materials into ocean waters and 
    establishes a permit program for ocean dumping. In addition the MPRSA 
    establishes Marine Sanctuaries Program, implemented by the National 
    Oceanographic and Atmospheric Administration (NOAA), which requires 
    NOAA to designate ocean waters as marine sanctuaries for the purpose of 
    preserving or restoring their conservation, recreational, ecological or 
    aesthetic values. Pursuant to the Marine Protection and Sanctuaries 
    Act, the National Oceanographic and Atmospheric Administration has 
    designated the Flower Garden Banks, an area within the coverage of the 
    OCS
    
    [[Page 58724]]
    
    general permit, a marine sanctuary. The OCS general permit prohibits 
    discharges in areas of biological concern, including marine 
    sanctuaries. No change adopted today affects that prohibition.
    
    Endangered Species Act
    
        As explained at 63 FR 2238, EPA has found that issuance of the 
    General Permit for the Outer Continental for the Western Gulf of Mexico 
    will not adversely affect any listed threatened or endangered species 
    or designated critical habitat and requested written concurrence on 
    that determination from the National Marine Fisheries Service. The 
    National Marine Fisheries Service provided such concurrence on the 
    proposed NPDES General Permit for the Western Portion of the Outer 
    Continental Shelf of the Gulf of Mexico.
    
    State Water Quality Standards and State Certification
    
        Because state waters are not included in the area covered by this 
    NPDES general permit, no state waters are affected by the discharges it 
    authorizes. Thus, the state water quality certification provisions of 
    CWA section 401 do not apply to this permit.
    
    Executive Order 12866
    
        The Office of Management and Budget (OMB) has exempted this action 
    from the review requirements of Executive Order 12291 pursuant to 
    section 8(b) of that order. Guidance on Executive Order 12866 contain 
    the same exemptions on OMB review as existed under Executive Order 
    12291. In fact, however, EPA prepared a regulatory impact analysis in 
    connection with its promulgation of guidelines on which a number of the 
    permit's provisions are based and submitted it to OMB for review. See 
    58 FR 12494.
    
    Paperwork Reduction Act
    
        The information collection required by this permit has been 
    approved by the Office of Management and Budget (OMB) under the 
    provisions of the Paperwork Reduction Act, 44 U.S.C. 3501 et seq., in 
    submission made for the NPDES permit program and assigned OMB control 
    numbers 2040-0086 (NPDES permit application) and 2040-0004 (discharge 
    monitoring reports).
        Since this permit is very similar in reporting and application 
    requirements and in discharges which are required to be monitored as 
    the previous Western Gulf of Mexico Outer Continental Shelf (OCS) 
    general permit (GMG290000) the paperwork burdens are expected to be 
    nearly identical. When it issued the previous OCS general permit, EPA 
    estimated it would take an affected facility three hours to prepare the 
    request for coverage and 38 hours per year to prepare discharge 
    monitoring reports. Although produced water discharges are not 
    authorized by the permit at this time, it is estimated that the time 
    required to prepare the request for coverage and discharge monitoring 
    reports for the reissued permit will be approximately the same.
    
    Regulatory Flexibility Act
    
        The Regulatory Flexibility Act, 5 U.S.C. 601 et seq,io0 requires 
    that EPA prepare a regulatory flexibility analysis for regulations that 
    have a significant impact on a substantial number of small entities. As 
    indicated below, the permit issued today is not a ``rule'' subject to 
    the Regulatory Flexibility Act . EPA prepared a regulatory flexibility 
    analysis, however, on the promulgation of the Offshore Subcategory 
    guidelines on which many of the permit's effluent limitations are 
    based. That analysis shows that issuance of this permit will not have a 
    significant impact on a substantial number of small entities.
    
    Unfunded Mandates Reform Act
    
        Section 201 of the Unfunded Mandates Reform Act (UMRA), Public Law 
    104-4, generally requires Federal agencies to assess the effects of 
    their ``regulatory actions'' on State, local, and tribal governments 
    and the private sector. As stated in the Federal Register document for 
    the proposed permit, this permit is not a rule which is subject to the 
    requirements of the UMRA. The permit also would not uniquely affect 
    small governments because compliance with the proposed permit 
    conditions affects small governments in the same manner as any other 
    entities seeking coverage under the permit. Additionally, EPA does not 
    expect small governments to operate facilities authorized to discharge 
    by this permit. No comments were received which challenge EPA's 
    interpretation of the Unfunded Mandates Reform Act, as it applies to 
    this permit.
    
    National Environmental Policy Act (NEPA)
    
        As stated in the Federal Register notice for the proposed permit 
    (see 63 FR 2238, January 14, 1998) EPA determined that reissuance of 
    this NPDES general permit will not result in any new impacts which were 
    not subjected to NEPA analysis in either Mineral Management Service's 
    EIS or the SEIS produced by EPA Region 6. All discharges authorized by 
    this reissued permit were addressed in that NEPA Review. Thus EPA did 
    not prepare a supplemental environmental impact statement for this 
    action. No comments, on the proposed permit, were received which would 
    suggest additional actions are required to meet the requirements of 
    NEPA.
    
    Authorization To Discharge Under the National Pollutant Discharge 
    Elimination System
    
        In compliance with the Federal Water Pollution Control Act, as 
    amended (33 U.S.C. 1251 et. seq. the ``Act''), operators of lease 
    blocks in the Oil and Gas Extraction Point Source Category which are 
    located in Federal waters of the Western Portion of the Gulf of Mexico 
    (defined as seaward of the outer boundary of the territorial seas off 
    Louisiana and Texas) are authorized to discharge to the Western Portion 
    of the Federal Waters of the Gulf of Mexico in accordance with effluent 
    limitations, monitoring requirements, and other conditions set forth in 
    parts I, II, and III hereof.
        Operators of lease blocks located within the general permit area 
    must submit written notification to the Regional Administrator that 
    they intend to be covered (see part I.A.2). Unless otherwise notified 
    in writing by the Regional Administrator after submission of the 
    notification, owners or operators requesting coverage are authorized to 
    discharge under this general permit. Operators of lease blocks within 
    the general permit area who fail to notify the Regional Administrator 
    of intent to be covered by this general permit are not authorized under 
    this general permit to discharge pollutants from those facilities. 
    Operators who have previously submitted a written notification of 
    intent to be covered by a subsequent permit, as required by the 
    previous permit, need not submit an additional notification of intent 
    to be covered.
        Facilities which adversely affect properties listed or eligible for 
    listing in the National Register of Historic Places are not authorized 
    to discharge under this permit.
        This permit shall become effective at Midnight Central Daylight 
    Savings Time on November 2, 1998.
        This permit and the authorization to discharge shall expire at 
    midnight,
    
    [[Page 58725]]
    
    Central Standard Time, November 3, 2003.
    William B. Hathaway,
    Director, Water Quality Protection Division, Region 6.
    
    Part I. Requirements for NPDES Permits
    
    Section A. Permit Applicability and Coverage Conditions
    
    1. Operations Covered
        This permit establishes effluent limitations, prohibitions, 
    reporting requirements, and other conditions on discharges from oil and 
    gas facilities engaged in production, field exploration, developmental 
    drilling, well completion, well treatment operations, and well workover 
    and abandonment operations.
        The permit coverage area consists of lease blocks located in and 
    discharging to Federal waters in the Gulf of Mexico seaward of the 
    outer boundary of the territorial seas offshore of Louisiana and Texas 
    and shall include lease blocks west of the western boundary of the 
    outer continental shelf lease areas defined as: Mobile, Viosca Knoll 
    (north part), Destin Dome, Desoto Canyon, Lloyd, and Henderson. In 
    Texas, where the state has mineral rights to 3 leagues, some operators 
    with state lease tracts are required to request coverage under this 
    Federal NPDES general permit. This permit does not authorize discharges 
    from facilities located in or discharging to the territorial seas of 
    Louisiana or Texas or from facilities defined as ``coastal,'' 
    ``onshore,'' or ``stripper'' (see 40 CFR part 435, subparts C, D, and 
    E).
    2. Notification Requirements
        Written notification of intent to be covered including the legal 
    name and address of the operator, the lease block number assigned by 
    the Department of Interior or the state or, if none, the name commonly 
    assigned to the lease area shall be submitted at least fourteen days 
    prior to the commencement of discharge. If the lease block was 
    previously covered by this or another permit, the operator shall also 
    include the previous permit number in the notification. The notice of 
    intent must also identify any facility which is a New Source and state 
    the date on which the facility's protection from more stringent new 
    source performance standards or technology based limitations ends. That 
    date is the soonest of: ten years from the date that construction is 
    completed, ten years from the date the source begins to discharge 
    process or non-construction related waste water, or the end of the 
    period of depreciation or amortization of the facility for the purposes 
    of section 167 or 169 (or both) of the Internal Revenue code of 1954.
        Additionally, if an application for an individual permit for the 
    activity was previously submitted to EPA Region 6, the notice of intent 
    shall include the application/permit number of that application or the 
    permit number of any individual NPDES permit issued by EPA Region 6 for 
    this activity.
        Permittees located in lease blocks that (a) are neither in nor 
    adjacent to MMS-defined ``no activity'' areas, or (b) do not require 
    live-bottom surveys are required only to submit a notice of intent to 
    be covered by this general permit. Permittees who are located in lease 
    blocks that are either in or adjacent to ``no activity'' areas or 
    require live bottom surveys are required to submit both a notice of 
    intent to be covered that specifies they are located in such a lease 
    block, and in addition are required to submit a notice of commencement 
    of operations.
        Permittees located in lease blocks either in or immediately 
    adjacent to MMS-defined ``no activity'' areas, shall be responsible for 
    determining whether a controlled discharge rate is required. The 
    maximum discharge rate for drilling fluids is determined by the 
    distance from the facility to the ``no activity'' area boundary and the 
    discharge rate equation provided in part I.B.1.b. of this permit. The 
    permittee shall report the distance from the permitted facility to the 
    ``no activity'' area boundary and the calculated maximum discharge rate 
    to EPA with its notice of commencement of operations.
        For permittees located in lease blocks that require live-bottom 
    surveys, the final determination of the presence or absence of live-
    bottom communities, the distance of the facility from identified live-
    bottom areas, and the calculated maximum discharge rate shall be 
    reported with the notice of commencement of operations.
        All notifications of intent to be covered and any subsequent 
    reports under this permit shall be sent to the following address: Water 
    Enforcement Branch (6EN-WC), Region 6, U.S. Environmental Protection 
    Agency, P.O. Box 50625, Dallas, TX 75250. Operators who have previously 
    submitted a written notification of intent to be covered by a 
    subsequent permit, as required by the previous permit, need not submit 
    an additional notification of intent to be covered.
    3. Termination of Operations
        Lease block operators shall notify the Regional Administrator 
    within 60 days after the permanent termination of discharges from their 
    facilities within the lease block.
    
    Section B. Effluent Limitations and Monitoring Requirements
    
    1. Drilling Fluids
        The discharge of drilling fluids shall be limited and monitored by 
    the permittee as specified in Table 2 of appendix A and as below.
    
        Special Note: The permit prohibitions and limitations that apply 
    to drilling fluids, also apply to fluids that adhere to drill 
    cuttings. Any permit condition that may apply to the drilling fluid 
    discharges, therefore, also applies to cuttings discharges.
    
        [Exception] The discharge rate limit for drilling fluids does not 
    apply to drill cuttings.
    a. Prohibitions
        Oil-Based Drilling Fluids. The discharge of oil-based drilling 
    fluids and inverse emulsion drilling fluids is prohibited.
        Oil Contaminated Drilling Fluids. The discharge of drilling fluids 
    which contain waste engine oil, cooling oil, gear oil or any lubricants 
    which have been previously used for purposes other than borehole 
    lubrication, is prohibited.
        Diesel Oil. Drilling fluids to which any diesel oil has been added 
    as a lubricant may not be discharged.
    b. Limitations
        Mineral Oil. Mineral oil may be used only as a carrier fluid 
    (transporter fluid), lubricity additive, or pill.
        Cadmium and Mercury in Barite. There shall be no discharge of 
    drilling fluids to which barite has been added, if such barite contains 
    mercury in excess of 1.0 mg/kg (dry weight) or cadmium in excess of 3.0 
    mg/kg (dry weight). The permittee shall analyze a representative sample 
    of all stock barite used once, prior to drilling each well, and submit 
    the results for total mercury and cadmium in the Discharge Monitoring 
    Report (DMR).
        If more than one well is being drilled at a site, new analyses are 
    not required for subsequent wells, provided that no new supplies of 
    barite have been received since the previous analysis. In this case, 
    the results of the previous analysis should be used on the DMR.
        Alternatively, the permittee may provide certification, as 
    documented by the supplier(s), that the barite being used on the well 
    will meet the above limits. The concentration of the mercury and 
    cadmium in the barite shall be reported on the DMR as documented by the 
    supplier.
        Analyses shall be conducted by absorption spectrophotometry (see 40
    
    [[Page 58726]]
    
    CFR part 136, flame and flameless AAS) and the results expressed in mg/
    kg (dry weight).
        Toxicity. Discharged drilling fluids shall meet both a daily 
    minimum and a monthly average minimum 96-hour LC50 of at least 30,000 
    ppm in a 9:1 seawater to drilling fluid suspended particulate phase 
    (SPP) volumetric ratio using Mysidopsis bahia. Monitoring shall be 
    performed at least once per month for both a daily minimum and the 
    monthly average. In addition, an end-of-well sample is required for a 
    daily minimum. The type of sample required is a grab sample, taken from 
    beneath the shale shaker, or if there are no returns accross the shale 
    shaker, the sample must be taken from a location that is characteristic 
    of the overall mud system to be discharged. Permittees shall report 
    pass or fail on the DMR using either the full toxicity test or the 
    partial toxicity test as specified at 58 FR 12512; however, if the 
    partial toxicity test shows a failure, all testing of future samples 
    from that well shall be conducted using the full toxicity test method 
    to determine the 96-hour LC50.
        Free Oil. No free oil shall be discharged. Monitoring shall be 
    performed using the static sheen method once per week when discharging. 
    The number of days a sheen is observed must be recorded.
        Discharge Rate. All facilities are subject to a maximum discharge 
    rate of 1,000 barrels per hour.
        For those facilities subject to the discharge rate limitation 
    requirement because of their proximity to areas of biological concern, 
    the discharge rate of drilling fluids shall be determined by the 
    following equation:
    
    R = 10 [3 Log (d/15) + Tt]
    Where:
    R = discharge rate (bbl/hr)
    d = distance (meters) from the boundary of a controlled discharge rate 
    area
    Tt
        = toxicity-based discharge rate term
        = [log (LC50 x 8 x 10-6)] / 0.3657
    
        Drilling fluids discharges (based on a mud toxicity of 30,000 ppm) 
    equal to or less than 544 meters from areas of biological concern shall 
    comply with the discharge rate obtained from the equation above. 
    Drilling fluids discharges which are shunted to the bottom as required 
    by MMS lease stipulation are not subject to this discharge rate control 
    requirement.
        All discharged drilling fluids, including those fluids adhering to 
    cuttings must meet the limitations of this section except that 
    discharge rate limitations do not apply before installation of the 
    marine riser.
    C. Monitoring Requirements
        Drilling Fluids Inventory. The permittee shall maintain a precise 
    chemical inventory of all constituents and their total volume or mass 
    added downhole for each well.
    2. Drill Cuttings
        The discharge of drill cuttings shall be limited and monitored by 
    the permittee as specified in appendix A, Table 2 and as below.
    a. Prohibitions
        Cuttings from Oil Based Drilling Fluids. The discharge of cuttings 
    that are generated while using an oil-based or invert emulsion mud is 
    prohibited.
        Cuttings from Oil Contaminated Drilling Fluids. The discharge of 
    cuttings that are generated using drilling fluids which contain waste 
    engine oil, cooling oil, gear oil or any lubricants which have been 
    previously used for purposes other than borehole lubrication, is 
    prohibited.
        Cuttings Generated Using Drilling Fluids which Contain Diesel Oil. 
    Drill cuttings generated using drilling fluids to which any diesel oil 
    has been added as a lubricant may not be discharged.
        Cuttings Generated Using Mineral Oil. The discharge of cuttings 
    generated using drilling fluids which contain mineral oil is prohibited 
    except when the mineral oil is used as a carrier fluid (transporter 
    fluid), lubricity additive, or pill.
        Cadmium and Mercury in Barite. Drill cuttings generated using 
    drilling fluids to which barite has been added shall not be discharged 
    if such barite contains mercury in excess of 1.0 mg/kg (dry weight) or 
    cadmium in excess of 3.0 mg/kg (dry weight).
        Toxicity. Drill cuttings generated using drilling fluids with a 
    daily minimum or a monthly average minimum 96-hour LC50 of less than 
    30,000 ppm in a 9:1 seawater to drilling fluid suspended particulate 
    phase (SPP) volumetric ratio using Mysidopsis bahia shall not be 
    discharged.
    b. Limitations
        Free Oil. No free oil shall be discharged. Monitoring shall be 
    performed using the static sheen test method once per week when 
    discharging. The number of days a sheen is observed must be recorded.
    3. Deck Drainage
    a. Limitations
        Free Oil. No free oil shall be discharged, as determined by the 
    visual sheen method on the surface of the receiving water. Monitoring 
    shall be performed once per day when discharging, during conditions 
    when an observation of a visual sheen on the surface of the receiving 
    water is possible in the vicinity of the discharge, and the facility is 
    manned. The number of days a sheen is observed must be recorded.
    4. Produced Sand
        There shall be no discharge of produced sand.
    5. Well Treatment Fluids, Completion Fluids, and Workover Fluids
    a. Limitations
        Free Oil. No free oil shall be discharged. Monitoring shall be 
    performed using the static sheen test method once per day when 
    discharging and the facility is manned. The number of days a sheen is 
    observed must be recorded.
        Oil and Grease. Well treatment, completion, and workover fluids 
    must meet both a daily maximum of 42 mg/l and a monthly average of 29 
    mg/l limitation for oil and grease. The sample type may be either grab, 
    or a 24-hour composite consisting of the arithmetic average of the 
    results of 4 grab samples taken within the 24-hour period. If only one 
    sample is taken for any one month, it must meet both the daily and 
    monthly limits. The analytical method is that specified at 40 CFR part 
    136 or the alternate method described in part I.D.5 of this permit.
        Priority Pollutants. For well treatment fluids, completion fluids, 
    and workover fluids, the discharge of priority pollutants is prohibited 
    except in trace amounts. Information on the specific chemical 
    composition of any additives containing priority pollutants shall be 
    recorded.
        [Note] If materials added downhole as well treatment, completion, 
    or workover fluids contain no priority pollutants, the discharge is 
    assumed not to contain priority pollutants except possibly in trace 
    amounts.
    b. Monitoring Requirements
        This discharge shall be considered produced water for monitoring 
    purposes when commingled with produced water.
    6. Sanitary Waste (Facilities Continuously Manned by 10 or More 
    Persons)
    a. Prohibitions
        Solids. No floating solids may be discharged to the receiving 
    waters. An observation must be made once per day for floating solids. 
    Observation must be made during daylight in the vicinity of sanitary 
    waste outfalls following either
    
    [[Page 58727]]
    
    the morning or midday meal and at a time during maximum estimated 
    discharge. The number of days solids are observed must be recorded.
    b. Limitations
        Residual Chlorine. Total residual chlorine is a surrogate parameter 
    for fecal coliform. Discharge of residual chlorine must meet a minimum 
    of 1 mg/l and shall be maintained as close to this concentration as 
    possible. A grab sample must be taken once per month and the 
    concentration recorded (approved method, Hach CN-66-DPD).
        [Exception] Any facility which properly operates and maintains a 
    marine sanitation device (MSD) that complies with pollution control 
    standards and regulations under section 312 of the Act shall be deemed 
    in compliance with permit limitations for sanitary waste. The MSD shall 
    be tested yearly for proper operation and the test results maintained 
    at the facility.
    7. Sanitary Waste (Facilities Continuously Manned by 9 or Fewer Persons 
    or Intermittently by Any Number)
    Prohibitions
        Solids. No floating solids may be discharged to the receiving 
    waters. An observation must be made once per day for floating solids. 
    Observation must be made during daylight in the vicinity of sanitary 
    waste outfalls following either the morning or midday meal and at a 
    time during maximum estimated discharge. The number of days solids are 
    observed must be recorded.
        [Exception] Any facility which properly operates and maintains a 
    marine sanitation device (MSD) that complies with pollution control 
    standards and regulations under section 312 of the Act shall be deemed 
    to be in compliance with permit limitations for sanitary waste. The MSD 
    shall be tested yearly for proper operation and the test results 
    maintained at the facility.
    8. Domestic Waste
    a. Prohibitions
        Solids. No floating solids or foam shall be discharged.
    b. Monitoring Requirements
        An observation shall be made once per day during daylight in the 
    vicinity of domestic waste outfalls following the morning or midday 
    meal and at a time during maximum estimated discharge. The number of 
    days solids are observed must be recorded.
    9. Miscellaneous Discharges
    Desalination Unit Discharge
    Diatomaceous Earth Filter Media
    Blowout Preventer Fluid
    Uncontaminated Ballast Water
    Uncontaminated Bilge Water
    Mud, Cuttings, and Cement at the Seafloor
    Uncontaminated Freshwater
    Uncontaminated Seawater
    Boiler Blowdown
    Source Water and Sand
    Excess Cement Slurry
    Limitations
        Free Oil. No free oil shall be discharged. Discharge is limited to 
    those times that a visual sheen observation is possible unless the 
    operator uses the static sheen method. Monitoring shall be performed 
    using the visual sheen method on the surface of the receiving water 
    once per week when discharging, or by use of the static sheen method at 
    the operator's option. The number of days a sheen is observed must be 
    recorded.
        [Exceptions] Uncontaminated seawater, uncontaminated freshwater, 
    source water and source sand, uncontaminated bilge water, and 
    uncontaminated ballast water may be discharged from platforms that are 
    on automatic purge systems without monitoring for free oil when the 
    facilities are not manned. Additionally, discharges at the seafloor of: 
    muds and cuttings prior to installation of the marine riser, cement, 
    and blowout preventer fluid may be discharged without monitoring with 
    the static sheen test when conditions make observation of a visual 
    sheen on the surface of the receiving water impossible.
    10. Miscellaneous Discharges of Seawater and Freshwater Which Have Been 
    Chemically Treated
    Excess seawater which permits the continuous operation of fire control 
    and utility lift pumps
    Excess seawater from pressure maintenance and secondary recovery 
    projects
    Water released during training of personnel in fire protection
    Seawater used to pressure test new piping and new pipelines
    Ballast water
    Once Through Non-contact cooling water
    Desalinization unit discharge
    a. Limitations
        Treatment Chemicals. The concentration of treatment chemicals in 
    discharged seawater or freshwater shall not exceed the most stringent 
    of the following three constraints:
        (1) The maximum concentrations and any other conditions specified 
    in the EPA product registration labeling if the chemical is an EPA 
    registered product.
        (2) The maximum manufacturer's recommended concentration.
        (3) 500 mg/l.
        Free Oil. No free oil shall be discharged. Discharge is limited to 
    those times that a visible sheen observation is possible unless the 
    operator uses the static sheen method. Monitoring shall be performed 
    using the visual sheen method on the surface of the receiving water 
    once per week when discharging, or by use of the static sheen method at 
    the operator's option. The number of days a sheen is observed must be 
    recorded.
        Toxicity. The 48-hour minimum and monthly average minimum No 
    Observable Effect Concentration (NOEC), or if specified the 7-day 
    average minimum and monthly average minimum NOEC, must be equal to or 
    greater than the critical dilution concentration specified in this 
    permit in Table 3-A for seawater discharges and 3-B for freshwater 
    discharges. Critical dilution shall be determined using Table 3 of this 
    permit and is based on the discharge rate, discharge pipe diameter, and 
    water depth between the discharge pipe and the bottom. The monthly 
    average minimum NOEC value is defined as the arithmetic average of all 
    48-hour average NOEC (or 7-day average minimum NOEC) values determined 
    during the month.
    b. Monitoring Requirements
        Flow. Once per month, an estimate of the flow (MGD) must be 
    recorded.
        Toxicity. The required frequency of testing for continuous 
    discharges shall be determined as follows:
    
    ------------------------------------------------------------------------
                Discharge rate                 Toxicity testing frequency
    ------------------------------------------------------------------------
    0--499 bbl/day.......................  Once per year.
    500--4,599 bbl/day...................  Once per quarter.
    4,600 bbl/day and above..............  Once per month.
    ------------------------------------------------------------------------
    
        Intermittent or batch discharges shall be monitored once per 
    discharge but are required to be monitored no more frequently than the 
    corresponding frequencies shown above for continuous discharges.
        Samples shall be collected after addition of any added substances, 
    including seawater that is added prior to discharge, and before the 
    flow is split for multiple discharge ports. Samples also shall be 
    representative of the discharge. Methods to increase dilution 
    previously described for produced water in part I.B.4.a also apply to 
    seawater and freshwater discharges which have been chemically treated.
    
    [[Page 58728]]
    
        If the permittee has been compliant with this toxicity limit for 
    one full year (12 consecutive months) for a continuous discharge of 
    chemically treated seawater or freshwater, the required testing 
    frequency shall be reduced to once per year for that discharge.
    
    Section C. Other Discharge Limitations
    
    1. Floating Solids or Visible Foam
        There shall be no discharge of floating solids or visible foam from 
    any source in other than trace amounts.
        [Exception] For new sources, this limitation only applies to 
    miscellaneous discharges and domestic waste discharges.
    2. Halogenated Phenol Compounds
        There shall be no discharge of halogenated phenol compounds as a 
    part of any waste stream authorized in this permit.
    3. Dispersants, Surfactants, and Detergents
        The facility operator shall minimize the discharge of dispersants, 
    surfactants and detergents except as necessary to comply with the 
    safety requirements of the Occupational Safety and Health 
    Administration and the Minerals Management Service. This restriction 
    applies to tank cleaning and other operations which do not directly 
    involve the safety of workers. The restriction is imposed because 
    detergents disperse and emulsify oil, thereby increasing toxicity and 
    making the detection of a discharge of oil more difficult.
    4. Garbage
        The discharge of garbage (see part II.G.32) is prohibited .
        [Exception] Comminuted food waste (able to pass through a screen 
    with a mesh no larger than 25 mm, approx. 1 inch) may be discharged 
    when 12 nautical miles or more from land.
    5. Area of Biological Concern
        There shall be no discharge in Areas of Biological Concern, 
    including marine sanctuaries. The Flower Garden Banks has been 
    determined to be a Marine Sanctuary and is within the geographical area 
    covered under this permit.
    
    Section D. Other Conditions
    
    1. Samples of Wastes
        If requested, the permittee shall provide EPA with a sample of any 
    waste in a manner specified by the Agency.
    2. Drilling Fluids Toxicity Test
        The approved test method for permit compliance is identified as: 
    Drilling Fluids Toxicity Test at 40 CFR part 435, subpart A, appendix 
    2.
    3. Chemically Treated Seawater and Freshwater Toxicity Testing 
    Requirements (48-Hour Acute NOEC Marine Limits)
        The approved test methods for permit compliance are identified in 
    40 CFR part 136.
        a. The permittee shall utilize the Mysidopsis bahia (Mysid shrimp) 
    acute static renewal 48-hour definitive toxicity test using EPA/600/4-
    90/027F.
        b. Menidia beryllina (Inland Silverside minnow) acute static 
    renewal 48-hour definitive toxicity test using EPA/600/4-90/027F.
        c. The NOEC (No observable Effect Concentration) is defined as the 
    greatest effluent dilution which does not result in lethality that is 
    statistically different from the control (0% effluent) at the 95% 
    confidence level.
        d. If the effluent fails the survival endpoint at the critical 
    dilution, the permittee shall be considered in violation of this permit 
    limit. Also, when the testing frequency stated above is less than 
    monthly and the effluent fails the survival endpoint at the critical 
    dilution, the monitoring frequency for the affected species will 
    increase to monthly until such time as compliance with the Lethal No 
    Observed Effect Concentration (NOEC) effluent limitation is 
    demonstrated for a period of three consecutive months, at which time 
    the permittee may return to the testing frequency stated in part 
    I.B.11.b of this permit. During the period the permittee is out of 
    compliance, test results shall be reported on the DMR for that 
    reporting period.
        e. This permit may be reopened to require chemical specific 
    effluent limits, additional testing, and/or other appropriate actions 
    to address toxicity.
        f. Test Acceptance. The permittee shall repeat a test, including 
    the control and all effluent dilutions, if the procedures and quality 
    assurance requirements defined in the test methods or in this permit 
    are not satisfied, including the following additional criteria:
        (1) Each toxicity test control (0% effluent) must have a survival 
    equal to or greater than 90%.
        (2) The percent coefficient of variation between replicates shall 
    be 40% or less in the control (0% effluent) for the Mysid shrimp 
    survival test and the Inland Silverside minnow survival test.
        (3) The percent coefficient of variation between replicates shall 
    be 40% or less in the critical dilution, unless significant lethal 
    effects are exhibited for the Mysid shrimp survival test and the Inland 
    Silverside minnow survival test.
        Test failure may not be construed or reported as invalid due to a 
    coefficient of variation value of greater than 40%. A repeat test shall 
    be conducted within the required reporting period of any test 
    determined to be invalid.
        g. Statistical Interpretation. For the Mysid shrimp survival test 
    and the Inland Silverside minnow survival test, the statistical 
    analyses used to determine if there is a statistically significant 
    difference between the control and the critical dilution shall be in 
    accordance with the methods for determining the No Observed Effect 
    Concentration (NOEC) as described in EPA/600/4-90/027F or the most 
    recent update thereof.
        If the conditions of Test Acceptability are met in Item 4.f above 
    and the percent survival of the test organism is equal to or greater 
    than 80% in the critical dilution concentration and all lower dilution 
    concentrations, the test shall be considered to be a passing test, and 
    the permittee shall report an NOEC of not less than the critical 
    dilution for the DMR reporting requirements found in Item i below.
        h. The permittee shall prepare a full report of the results of all 
    tests conducted pursuant to this section in accordance with the Report 
    Preparation section of ``Methods for Measuring the Acute Toxicity of 
    Effluents and Receiving Waters to Freshwater and Marine Organisms,'' 
    EPA/600/4-90/027F, or the latest update thereof, for every valid or 
    invalid toxicity test initiated whether carried to completion or not. 
    The permittee shall retain each full report pursuant to the provisions 
    of part II.C.3 of this permit. The permittee shall submit full reports 
    only upon the specific request of the Agency.
        i. In accordance with part II.D.4 of this permit, the permittee 
    shall report on the DMR for the reporting period whether the lowest 
    Whole Effluent Lethality values determined for either species passed 
    the 30-Day Average Minimum and 48-Hour Minimum NOEC. In addition, the 
    permittee shall report on the DMR the lowest NOEC survival value of the 
    two species.
    4. Oil and Grease Alternative Test Procedure: Interim Limited Use 
    Approval
        Proposed Method 1664 (61 FR 1730, January 23, 1996) may be used as 
    an alternative test procedure for NPDES permit compliance monitoring 
    purposes. This approval shall expire at
    
    [[Page 58729]]
    
    the time of the publication in the Federal Register of the final rule 
    governing the use of Method 1664. This approval includes all of the 
    analytical options within Method 1664 provided the equivalency 
    demonstration is performed and all performance specifications are met.
    5. Visual Sheen Test
        The visual sheen test is used to detect free oil by observing the 
    surface of the receiving water for the presence of a sheen while 
    discharging. The operator must conduct a visual sheen test only at 
    times when a sheen could be observed. This restriction eliminates 
    observations when atmospheric or surface conditions prohibit the 
    observer from detecting a sheen (e.g., overcast skies, rough seas, 
    etc.).
        The observer must be positioned on the rig or platform, relative to 
    both the discharge point and current flow at the time of discharge, 
    such that the observer can detect a sheen should it surface down 
    current from the discharge. For discharges that have been occurring for 
    a least 15 minutes previously, observations may be made any time 
    thereafter. For discharges of less than 15 minutes duration, 
    observations must be made during both discharge and at 5 minutes after 
    discharge has ceased.
    6. Static Sheen Test
        The approved test method for permit compliance is identified as: 
    Static Sheen Test at 40 CFR part 435, subpart A, appendix 1.
    
    Part II. Standard Conditions for NPDES Permits
    
    Section A. General Conditions
    
    1. Introduction
        In accordance with the provisions of 40 CFR part 122.41, et. seq., 
    this permit incorporates by reference ALL conditions and requirements 
    applicable to NPDES permits set forth in the Clean Water Act, as 
    amended, (herein-after known as the ``Act'') as well as ALL applicable 
    regulations.
    2. Duty to Comply
        The permittee must comply with all conditions of this permit. Any 
    permit noncompliance constitutes a violation of the Act and is grounds 
    for enforcement action or for requiring a permittee to apply and obtain 
    an individual NPDES permit.
    3. Toxic Pollutants
        a. Notwithstanding part II.A.4, if any toxic effluent standard or 
    prohibition (including any schedule of compliance specified in such 
    effluent standard or prohibition) is promulgated under section 307(a) 
    of the Act for a toxic pollutant which is present in the discharge and 
    that standard or prohibition is more stringent than any limitation on 
    the pollutant in this permit, this permit shall be modified or revoked 
    and reissued to conform to the toxic effluent standard or prohibition.
        b. The permittee shall comply with effluent standards or 
    prohibitions established under section 307(a) of the Act for toxic 
    pollutants within the time provided in the regulations that established 
    those standards or prohibitions, even if the permit has not yet been 
    modified to incorporate the requirement.
    4. Permit Flexibility
        This permit may be modified, revoked and reissued, or terminated 
    for cause in accordance with 40 CFR 122.62-64. The filing of a request 
    for a permit modification, revocation and reissuance, or termination, 
    or a notification of planned changes or anticipated noncompliance, does 
    not stay any permit condition.
    5. Property Rights
        This permit does not convey any property rights of any sort, or any 
    exclusive privilege.
    6. Duty to Provide Information
        The permittee shall furnish to the Director, within a reasonable 
    time, any information which the Director may request to determine 
    whether cause exists for modifying, revoking and reissuing, or 
    terminating this permit, or to determine compliance with this permit. 
    The permittee shall also furnish to the Director, upon request, copies 
    of records required to be kept by this permit.
    7. Criminal and Civil Liability
        Except as provided in permit conditions on ``Bypassing'' and 
    ``Upsets,'' nothing in this permit shall be construed to relieve the 
    permittee from civil or criminal penalties for noncompliance. Any false 
    or materially misleading representation or concealment of information 
    required to be reported by the provisions of the permit, the Act, or 
    applicable regulations, which avoids or effectively defeats the 
    regulatory purpose of the permit may subject the permittee to criminal 
    enforcement pursuant to 18 U.S.C. 1001.
    8. Oil and Hazardous Substance Liability
        Nothing in this permit shall be construed to preclude the 
    institution of any legal action or relieve the permittee from any 
    responsibilities, liabilities, or penalties to which the permittee is 
    or may be subject under section 311 of the Act.
    9. State Laws
        Nothing in this permit shall be construed to preclude the 
    institution of any legal action or relieve the permittee from any 
    responsibilities, liabilities, or penalties established pursuant to any 
    applicable State Law or regulation under authority preserved by section 
    510 of the Act.
    10. Severability
        The provisions of this permit are severable, and if any provision 
    of this permit or the application of any provision of this permit to 
    any circumstance is held invalid, the application of such provision to 
    other circumstances, and the remainder of this permit, shall not be 
    affected thereby.
    
    Section B. Proper Operation and Maintenance
    
    1. Need to Halt or Reduce Not a Defense
        It shall not be a defense for a permittee in an enforcement action 
    that it would have been necessary to halt or reduce the permitted 
    activity in order to maintain compliance with the conditions of this 
    permit. The permittee is responsible for maintaining adequate 
    safeguards to prevent the discharge of untreated or inadequately 
    treated wastes during electrical power failure either by means of 
    alternate power sources, standby generators or retention of 
    inadequately treated effluent.
    2. Duty to Mitigate
        The permittee shall take all reasonable steps to minimize or 
    prevent any discharge in violation of this permit which has a 
    reasonable likelihood of adversely affecting human health or the 
    environment.
    3. Proper Operation and Maintenance
        a. The permittee shall at all times properly operate and maintain 
    all facilities and systems of treatment and control (and related 
    appurtenances) which are installed or used by permittee as efficiently 
    as possible and in a manner which will minimize upsets and discharges 
    of excessive pollutants and will achieve compliance with the conditions 
    of this permit. Proper operation and maintenance also includes adequate 
    laboratory controls and appropriate quality assurance procedures. This 
    provision requires the operation of backup or auxiliary facilities or 
    similar systems which are
    
    [[Page 58730]]
    
    installed by a permittee only when the operation is necessary to 
    achieve compliance with the conditions of this permit.
        b. The permittee shall provide an adequate operating staff which is 
    duly qualified to carry out operation, maintenance and testing 
    functions required to insure compliance with the conditions of this 
    permit.
    4. Bypass of Treatment Facilities
        a. Bypass not exceeding limitations. The permittee may allow any 
    bypass to occur which does not cause effluent limitations to be 
    exceeded, but only if it also is for essential maintenance to assure 
    efficient operation. These bypasses are not subject to the provisions 
    of parts II.B.4.b and 4.c.
        b. Notice.
        (1) Anticipated bypass. If the permittee knows in advance of the 
    need for a bypass, it shall submit prior notice, if possible at least 
    ten days before the date of the bypass.
        (2) Unanticipated bypass. The permittee shall, within 24 hours, 
    submit notice of an unanticipated bypass as required in part II.D.7.
        c. Prohibition of Bypass.
        (1) Bypass is prohibited, and the Director may take enforcement 
    action against a permittee for bypass, unless:
        (a) Bypass was unavoidable to prevent loss of life, personal 
    injury, or severe property damage;
        (b) There were no feasible alternatives to the bypass, such as the 
    use of auxiliary treatment facilities, retention of untreated wastes, 
    or maintenance during normal periods of equipment downtime. This 
    condition is not satisfied if adequate back-up equipment should have 
    been installed in the exercise of reasonable engineering judgement to 
    prevent a bypass which occurred during normal periods of equipment 
    downtime or preventive maintenance; and,
        (c) The permittee submitted notices as required by part II.B.4.b.
        (2) The Director may allow an anticipated bypass after considering 
    its adverse effects, if the Director determines that it will meet the 
    three conditions listed at part II.B.4.c(1).
    5. Upset Conditions
        a. Effect of an upset. An upset constitutes an affirmative defense 
    to an action brought for noncompliance with such technology-based 
    permit effluent limitations if the requirements of part II.B.5.b. are 
    met. No determination made during administrative review of claims that 
    noncompliance was caused by upset, and before an action for 
    noncompliance, is final administrative action subject to judicial 
    review.
        b. Conditions necessary for a demonstration of upset. A permittee 
    who wishes to establish the affirmative defense of upset shall 
    demonstrate, through properly signed, contemporaneous operating logs, 
    or other relevant evidence that:
        (1) An upset occurred and that the permittee can identify the 
    cause(s) of the upset;
        (2) The permitted facility was at the time being properly operated;
        (3) The permittee submitted notice of the upset as required by part 
    II.D.7; and,
        (4) The permittee complied with any remedial measures required by 
    part II.B.2.
        c. Burden of proof. In any enforcement proceeding, the permittee 
    seeking to establish the occurrence of an upset has the burden of 
    proof.
    6. Removed Substances
        Solids, sewage sludges, filter backwash, or other pollutants 
    removed in the course of treatment or wastewater control shall be 
    disposed of in a manner such as to prevent any pollutant from such 
    materials from entering navigable waters. Any substance specifically 
    listed within this permit may be discharged in accordance with 
    specified conditions, terms, or limitations.
    
    Section C. Monitoring and Records
    
    1. Inspection and Entry
        The permittee shall allow the Director, or an authorized 
    representative, upon the presentation of credentials and other 
    documents as may be required by the law to:
        a. Enter upon the permittee's premises where a regulated facility 
    or activity is located or conducted, or where records must be kept 
    under the conditions of this permit;
        b. Have access to and copy, at reasonable times, any records that 
    must be kept under the conditions of this permit;
        c. Inspect at reasonable times any facilities, equipment (including 
    monitoring and control equipment), practices or operations regulated or 
    required under this permit; and
        d. Sample or monitor at reasonable times, for the purpose of 
    assuring permit compliance or as otherwise authorized by the Act, any 
    substances or parameters at any location.
    2. Representative Sampling
        Samples and measurements taken for the purpose of monitoring shall 
    be representative of the monitored activity.
    3. Retention of Records
        The permittee shall retain records of all monitoring information, 
    including all calibration and maintenance records and all original 
    strip chart recordings for continuous monitoring instrumentation, 
    copies of all reports required by this permit, and records of all data 
    used to complete the application for this permit, for a period of at 
    least 3 years from the date of the sample, measurement, report, or 
    application. This period may be extended by request of the Director at 
    any time.
        The operator shall maintain records at development and production 
    facilities for 3 years, wherever practicable and at a specific shore-
    based site whenever not practicable. The operator is responsible for 
    maintaining records at exploratory facilities while they are 
    discharging under the operators control and at a specific shore-based 
    site for the remainder of the 3-year retention period.
    4. Record Contents
        Records of monitoring information shall include:
        a. The date, exact place, and time of sampling or measurements;
        b. The individual(s) who performed the sampling or measurements;
        c. The date(s) and time(s) analyses were performed;
        d. The individual(s) who performed the analyses;
        e. The analytical techniques or methods used; and
        f. The results of such analyses.
    5. Monitoring Procedures
        a. Monitoring must be conducted according to test procedures 
    approved under 40 CFR part 136, unless other test procedures have been 
    specified in this permit or approved by the Regional Administrator.
        b. The permittee shall calibrate and perform maintenance procedures 
    on all monitoring and analytical instruments at intervals frequent 
    enough to insure accuracy of measurements and shall maintain 
    appropriate records of such activities.
        c. An adequate analytical quality control program, including the 
    analyses of sufficient standards, spikes, and duplicate samples to 
    insure the accuracy of all required analytical results shall be 
    maintained by the permittee or designated commercial laboratory.
    6. Flow Measurements
        Appropriate flow measurement devices and methods consistent with 
    accepted scientific practices shall be selected and used to ensure the
    
    [[Page 58731]]
    
    accuracy and reliability of measurements of the volume of monitored 
    discharges. The devices shall be installed, calibrated, and maintained 
    to insure that the accuracy of the measurements is consistent with the 
    accepted capability of that type of device. Devices selected shall be 
    capable of measuring flows with a maximum deviation of less than 10% 
    from true discharge rates throughout the range of expected discharge 
    volumes.
    
    Section D. Reporting Requirements
    
    1. Planned Changes
        The permittee shall give notice to the Director as soon as possible 
    of any planned physical alterations or additions to the permitted 
    facility. Notice is required only when:
        (1) The alteration or addition to a permitted facility may meet one 
    of the criteria for determining whether a facility is a new source in 
    40 CFR part 122.29(b); or,
        (2) The alteration or addition could significantly change the 
    nature or increase the quantity of pollutants discharged. This 
    notification applies to pollutants which are subject neither to 
    effluent limitations in the permit, nor to notification requirements 
    listed at part II.D.10.a.
    2. Anticipated Noncompliance
        The permittee shall give advance notice to the Director of any 
    planned changes in the permitted facility or activity which may result 
    in noncompliance with permit requirements.
    3. Transfers
        This permit is not transferable to any person except after notice 
    to the Regional Administrator. The Regional Administrator may require 
    modification or revocation and reissuance of the permit to change the 
    name of the permittee and to incorporate such requirements as may be 
    necessary under the Act.
    4. Discharge Monitoring Reports and Other Reports
        The operator of each lease block shall be responsible for 
    submitting monitoring results for all facilities within each lease 
    block. The monitoring results for the facilities (platform, drilling 
    ship, or semisubmersible) within the particular lease block shall be 
    summarized on the annual Discharge Monitoring Report for that lease 
    block.
        Monitoring results obtained during the previous 12 months shall be 
    summarized and reported on a Discharge Monitoring Report (DMR) form 
    (EPA No. 3320-1).
        If any category of waste (discharge) is not applicable for all 
    facilities within the lease block, due to the type of operations (e.g., 
    drilling, production) no reporting is required; however, ``no 
    discharge'' must be recorded for those categories on the DMR. Operators 
    may list a summary of all lease blocks where there is no activity in 
    lieu of DMRs for those lease blocks. The summary must state each lease 
    block name and outfall number and must include the monitoring period. 
    All pages of the DMR, or summary of no activity lease blocks, must be 
    signed and certified as required by part II.D.11 of this permit and 
    returned when due.
        Additionally, the lease block number assigned by the Department of 
    the Interior shall be listed on all Discharge Monitoring Reports.
    5. Additional Monitoring by the Permittee
        If the permittee monitors any pollutant more frequently than 
    required by this permit, using test procedures approved under 40 CFR 
    part 136 or as specified in this permit, the results of this monitoring 
    shall be included in the calculation and reporting of the data 
    submitted in the Discharge Monitoring Report (DMR). Such increased 
    monitoring frequency shall also be indicated on the DMR.
    6. Averaging of Measurements
        Calculations for all limitations which require averaging of 
    measurements shall utilize an arithmetic mean unless otherwise 
    specified.
    7. Twenty-Four Hour Reporting
        a. The permittee shall report any noncompliance which may endanger 
    health or the environment. Any information shall be provided orally 
    within 24 hours from the time the permittee becomes aware of the 
    circumstances. Alternatively to oral reporting, the permittee may 
    report by EMAIL at the following address: [email protected] 
    A written submission shall be provided within 5 days of the time the 
    permittee becomes aware of the circumstances. The report shall contain 
    the following information:
        (1) A description of the noncompliance and its cause;
        (2) The period of noncompliance including exact dates and times, 
    and if the noncompliance has not been corrected, the anticipated time 
    it is expected to continue; and,
        (3) Steps being taken to reduce, eliminate, and prevent recurrence 
    of the noncomplying discharge.
        b. The following shall be included as information which must be 
    reported within 24 hours:
        (1) Any unanticipated bypass which exceeds any effluent limitation 
    in the permit;
        (2) Any upset which exceeds any effluent limitation in the permit; 
    and,
        (3) Violation of a maximum daily discharge limitation for any of 
    the pollutants listed by the Director in Part II of the permit to be 
    reported within 24 hours.
        c. The Director may waive the written report on a case-by-case 
    basis if the oral report has been received within 24 hours.
    8. Other Noncompliance
        The permittee shall report all instances of noncompliance not 
    reported under parts II.D.4 and D.7 at the time monitoring reports are 
    submitted. The reports shall contain the information listed at part 
    II.D.7.
    9. Other Information
        Where the permittee becomes aware that he failed to submit any 
    relevant facts in a permit application, or submitted incorrect 
    information in a permit application or in any report to the Director, 
    he shall promptly submit such facts or information.
    10. Signatory Requirements
        All applications, reports, or information submitted to the Director 
    shall be signed and certified.
        a. All permit applications shall be signed as follows:
        (1) For a corporation--by a responsible corporate officer. For the 
    purpose of this section, a responsible corporate officer means:
        (a) A president, secretary, treasurer, or vice-president of the 
    corporation in charge of a principal business function, or any other 
    person who performs similar policy or decision making functions for the 
    corporation; or,
        (b) The manager of one or more manufacturing, production, or 
    operating facilities employing more than 250 persons or having gross 
    annual sales or expenditures exceeding $25 million (in second-quarter 
    1980 dollars), if authority to sign documents has been assigned or 
    delegated to the manager in accordance with corporate procedures.
        (2) For a partnership or sole proprietorship--by a general partner 
    or the proprietor, respectively.
        (3) For a municipality, State, Federal, or other public agency--by 
    either a principal executive officer or ranking elected official. For 
    purposes of this election, a principal executive officer of a Federal 
    agency includes:
    
    [[Page 58732]]
    
        (a) The chief executive officer of the agency, or
        (b) A senior executive officer having responsibility for the 
    overall operations of a principal geographic unit of the agency.
         b. All reports required by the permit and other information 
    requested by the Director shall be signed by a person described above 
    or by a duly authorized representative of that person. A person is a 
    duly authorized representative only if:
        (1) The authorization is made in writing by a person described 
    above;
        (2) The authorization specifies either an individual or a position 
    having responsibility for the overall operation of the regulated 
    facility or activity, such as the position of plant manager, operator 
    of a well or a well field, superintendent, or position of equivalent 
    responsibility, or an individual or position having overall 
    responsibility for environmental matters for the company. A duly 
    authorized representative may thus be either a named individual or an 
    individual occupying a named position; and,
        (3) The written authorization is submitted to the Director.
        c. Certification. Any person signing a document under this section 
    shall make the following certification:
        ``I certify under penalty of law that this document and all 
    attachments were prepared under my direction or supervision in 
    accordance with a system designed to assure that qualified personnel 
    properly gather and evaluate the information submitted. Based on my 
    inquiry of the person or persons who manage the system, or those 
    persons directly responsible for gathering the information, the 
    information submitted is, to the best of my knowledge and belief, true, 
    accurate, and complete. I am aware that there are significant penalties 
    for submitting false information, including the possibility of fine and 
    imprisonment for knowing violations.''
    11. Availability of Reports
        Except for applications, effluent data, permits, and other data 
    specified in 40 CFR 122.7, any information submitted pursuant to this 
    permit may be claimed as confidential by the submitter. If no claim is 
    made at the time of submission, information may be made available to 
    the public without further notice.
    
    Section E. Penalties for Violations of Permit Conditions
    
    1. Criminal
    a. Negligent Violations
        The Act provides that any person who negligently violates permit 
    conditions implementing sections 301, 302, 306, 307, 308, 318, or 405 
    of the Act is subject to a fine of not less $2,500 nor more then 
    $25,000 per day of violation, or by imprisonment for not more than 1 
    year, or both.
    b. Knowing Violations
        The Act provides that any person who knowingly violates permit 
    conditions implementing sections 301, 302, 306, 307, 308, 318 or 405 of 
    the Act is subject to a fine of not less than $5,000 nor more than 
    $50,000 per day of violation, or by imprisonment for not more than 3 
    years, or both.
    c. Knowing Endangerment
        The Act provides that any person who knowingly violates permit 
    conditions implementing sections 301, 302, 303, 306, 307, 308, 318, or 
    405 of the Act and who knows at that time that he is placing another 
    person in imminent danger of death or serious bodily injury is subject 
    to a fine of not more than $250,000, or by imprisonment for not more 
    than 15 years, or both.
     d. False Statements
        The Act provides that any person who knowingly makes any false 
    material statement, representation, or certification in any 
    application, record report, plan, or other document filed or required 
    to be maintained under the Act or who knowingly falsifies, tampers 
    with, or renders inaccurate, any monitoring device or method required 
    to be maintained under the Act, shall upon conviction, be punished by a 
    fine of not more than $10,000, or by imprisonment for not more than 2 
    years, or by both. If a conviction of a person is for a violation 
    committed after a first conviction of such person under this paragraph, 
    punishment shall be by a fine of not more than $20,000 per day of 
    violation, or by imprisonment of not more than 4 years, or by both (see 
    section 309.c.4 of the Clean Water Act).
    2. Civil Penalties
        The Act provides that any person who violates a permit condition 
    implementing sections 301, 302, 306, 307, 308, 318, or 405 of the Act 
    is subject to a civil penalty not to exceed $27,500 per day for each 
    violation.
    3. Administrative Penalties
        The Act provides that any person who violates a permit conditions 
    implementing sections 301, 302, 306, 307, 308, 318, or 405 of the Act 
    is subject to an administrative penalty, as follows:
    a. Class I Penalty
        Not to exceed $11,000 per violation nor shall the maximum amount 
    exceed $27,500.
    b. Class II Penalty
        Not to exceed $11,000 per day for each day during which the 
    violation continues nor shall the maximum amount exceed $137,500.
    
    Section F. Additional General Permit Conditions
    
    1. When the Regional Administrator May Require Application for an 
    Individual NPDES Permit
        The Regional Administrator may require any person authorized by 
    this permit to apply for and obtain an individual NPDES permit when:
        a. The discharge(s) is a significant contributor of pollution;
        b. The discharger is not in compliance with the conditions of this 
    permit;
        c. A change has occurred in the availability of the demonstrated 
    technology or practices for the control or abatement of pollutants 
    applicable to the point sources;
        d. Effluent limitations guidelines are promulgated for point 
    sources covered by this permit;
        e. A Water Quality Management Plan containing requirements 
    applicable to such point source is approved;
        f. The point source(s) covered by this permit no longer:
        (1) Involve the same or substantially similar types of operations;
        (2) Discharge the same types of wastes;
        (3) Require the same effluent limitations or operating conditions;
        (4) Require the same or similar monitoring; and
        (5) In the opinion of the Regional Administrator, are more 
    appropriately controlled under an individual permit than under a 
    general permit.
        g. The bioaccumulation monitoring results show concentrations of 
    the listed pollutants in excess of levels safe for human consumption.
        The Regional Administrator may require any operator authorized by 
    this permit to apply for an individual NPDES permit only if the 
    operator has been notified in writing that a permit application is 
    required.
    2. When an Individual NPDES Permit May be Requested
        a. Any operator authorized by this permit may request to be 
    excluded from the coverage of this general permit by applying for an 
    individual permit.
        b. When an individual NPDES permit is issued to an operator 
    otherwise
    
    [[Page 58733]]
    
    subject to this general permit, the applicability of this permit to the 
    owner or operator is automatically terminated on the effective date of 
    this individual permit.
        c. A source excluded from coverage under this general permit solely 
    because it already has an individual permit may request that its 
    individual permit be revoked, and that it be covered by this general 
    permit. Upon revocation of the individual permit, this general permit 
    shall apply to the source.
    3. Permit Reopener Clause
        If applicable new or revised effluent limitations guidelines or New 
    Source Performance Standards covering the Offshore Subcategory of the 
    Oil and Gas Extraction Point Source Category (40 CFR part 435) are 
    promulgated in accordance with sections 301(b), 304(b)(2), and 
    307(a)(2), and the new or revised effluent limitations guidelines or 
    New Source Performance Standards are more stringent than any effluent 
    limitations in this permit or control a pollutant not limited in this 
    permit, the permit may, at the Director's discretion, be modified to 
    conform to the new or revised effluent limitations guidelines.
        Notwithstanding the above, if an offshore oil and gas extraction 
    point source discharge facility is subject to the ten year protection 
    period for new source performance standards under the Clean Water Act 
    section 306(d), this reopener clause may not be used to modify the 
    permit to conform to more stringent new source performance standards or 
    technology based standards developed under section 301(b)(2) during the 
    ten year period specified in 40 CFR part 122.29(d).
        The Director may modify this permit upon meeting the conditions set 
    forth in this reopener clause.
    
    Section G. Definitions
    
        All definitions contained in section 502 of the Act shall apply to 
    this permit and are incorporated herein by references. Unless otherwise 
    specified in this permit, additional definitions of words or phrases 
    used in this permit are as follows:
        1. ``Act'' means the Clean Water Act (33 U.S.C. 1251 et. seq.), as 
    amended.
        2. ``Administrator'' means the Administrator of the U.S. 
    Environmental Protection Agency.
        3. ``Annual Average'' means the average of all discharges sampled 
    and/or measured during a calendar year in which daily discharges are 
    sampled and/or measured, divided by the number of discharges sampled 
    and/or measured during such year.
        4. ``Applicable effluent standards and limitations'' means all 
    state and Federal effluent standards and limitations to which a 
    discharge is subject under the Act, including, but not limited to, 
    effluent limitations, standards or performance, toxic effluent 
    standards and prohibitions, and pretreatment standards.
        5. ``Applicable water quality standards'' means all water quality 
    standards to which a discharge is subject under the Act.
        6.``Areas of Biological Concern'' means a portion of the OCS 
    identified by EPA, in consultation with the Department of Interior as 
    containing potentially productive or unique biological communities or 
    as being potentially sensitive to discharges associated with oil and 
    gas activities.
        7. ``Blow-Out Preventer Control Fluid'' means fluid used to actuate 
    the hydraulic equipment on the blow-out preventer or subsea production 
    wellhead assembly.
        8. ``Boiler Blowdown'' means discharges from boilers necessary to 
    minimize solids build-up in the boilers, including vents from boilers 
    and other heating systems.
        9. ``Bulk Discharge'' any discharge of a discrete volume or mass of 
    effluent from a pit tank or similar container that occurs on a one-
    time, infrequent or irregular basis.
        10. ``Bypass'' means the intentional diversion of waste streams 
    from any portion of a treatment facility.
        11. ``Completion Fluids'' means salt solutions, weighted brines, 
    polymers and various additives used to prevent damage to the well bore 
    during operations which prepare the drilled well for hydrocarbon 
    production. These fluids move into the formation and return to the 
    surface as a slug with the produced water. Drilling muds remaining in 
    the wellbore during logging, casing, and cementing operations or during 
    temporary abandonment of the well are not considered completion fluids 
    and are regulated by drilling fluids requirements.
        12. ``Controlled Discharge Rates Areas'' means zones adjacent to 
    areas of biological concern.
        13. ``Daily Discharge'' means the discharge of a pollutant measured 
    during a calendar day or any 24-hour period that reasonably represents 
    the calendar day for purposes of sampling. For pollutants with 
    limitations expressed in terms of mass, the daily discharge is 
    calculated as the total mass of the pollutant discharged over the 
    sampling day. For pollutants with limitations expressed in other units 
    of measurement, the daily discharge is calculated as the average 
    measurement of the pollutant over the sampling day. Daily discharge 
    determination of concentration made using a composite sample shall be 
    the concentration of the composite sample. When grab samples are used, 
    the daily discharge determination of concentration shall be arithmetic 
    average (weighted by flow value) of all samples collected during that 
    sampling day.
        14. ``Daily Average'' (also known as monthly average) discharge 
    limitations means the highest allowable average of daily discharge(s) 
    over a calendar month, calculated as the sum of all daily discharge(s) 
    measured during a calendar month divided by the number of daily 
    discharge(s) measured during that month. When the permit establishes 
    daily average concentration effluent limitations or conditions, the 
    daily average concentration means the arithmetic average (weighted by 
    flow) of all daily discharge(s) of concentration determined during the 
    calendar month where C = daily concentration, F = daily flow, and n = 
    number of daily samples; daily average discharge =
    [GRAPHIC] [TIFF OMITTED] TN02NO98.276
    
        15. ``Daily Maximum'' discharge limitations means the highest 
    allowable ``daily discharge'' during the calendar month.
        16. ``Desalinization Unit Discharge'' means wastewater associated 
    with the process of creating freshwater from seawater.
        17. ``Deck Drainage'' means any waste resulting from deck washings, 
    spillage, rainwater, and runoff from gutters and drains including drip 
    pans and work areas within facilities covered under this permit.
        18. ``Development Drilling'' means the drilling of wells required 
    to efficiently produce a hydrocarbon formation or formations.
        19. ``Development Facility'' means any fixed or mobile structure 
    that is engaged in the drilling of productive wells.
        20. ``Diatomaceous Earth Filter Media'' means filter media used to 
    filter seawater or other authorized completion fluids and subsequently 
    washed from the filter.
        21. ``Diesel Oil'' means the grade of distillate fuel oil, as 
    specified in the American Society for Testing and Materials Standard 
    Specification D975-81, that is typically used as the continuous phase 
    in conventional oil-based drilling fluids.
    
    [[Page 58734]]
    
        22. ``Director'' means the U.S. Environmental Protection Agency 
    Regional Administrator or an authorized representative.
        23. ``Domestic Waste'' means material discharged from galleys, 
    sinks, showers, safety showers, eye wash stations, hand washing 
    stations, fish cleaning stations, and laundries.
        24. ``Drill Cuttings'' means particles generated by drilling into 
    the subsurface geological formations including cured cement carried to 
    the surface with the drilling fluid.
        25. ``Drilling Fluids'' means the circulating fluid (mud) used in 
    the rotary drilling of wells to clean and condition the hole and to 
    counterbalance formation pressure. A water-based drilling fluid is the 
    conventional drilling mud in which water is the continuous phase and 
    the suspending medium for solids, whether or not oil is present. An oil 
    based drilling fluids has diesel oil, mineral oil, or some other oil as 
    its continuous phase with water as the dispersed phase.
        26. ``End of well Sample'' means the sample taken after the final 
    log run is completed and prior to bulk discharge.
        27. ``Environmental Protection Agency'' (EPA) means the U.S. 
    Environmental Protection Agency.
        28. ``Excess Cement Slurry'' means the excess mixed cement, 
    including additives and wastes from equipment washdown, after a 
    cementing operation.
        29. ``Exploratory Facility'' means any fixed or mobile structure 
    that is engaged in the drilling of wells to determine the nature of 
    potential hydrocarbon reservoirs.
        30. ``Fecal Coliform Bacteria Sample'' consists of one effluent 
    grab portion collected during a 24-hour period at peak loads.
        31. ``Grab sample'' means an individual sample collected in less 
    than 15 minutes.
        32. ``Garbage'' means all kinds of food waste, wastes generated in 
    living areas on the facility, and operational waste, excluding fresh 
    fish and parts thereof, generated during the normal operation of the 
    facility and liable to be disposed of continuously or periodically, 
    except dishwater, graywater, and those substances that are defined or 
    listed in other Annexes to MARPOL 73/78.
        33. ``Graywater'' means drainage from dishwater, shower, laundry, 
    bath, and washbasin drains and does not include drainage from toilets, 
    urinals, hospitals, and cargo spaces.
        34. ``Inverse Emulsion Drilling Fluids'' means an oil-based 
    drilling fluid which also contains a large amount of water.
        35. ``Live bottom areas'' means those areas which contain 
    biological assemblages consisting of such sessile invertebrates as seas 
    fans, sea whips, hydroids, anemones, ascideians sponges, bryozoans, 
    seagrasses, or corals living upon and attached to naturally occurring 
    hard or rocky formations with fishes and other fauna.
        36. ``Maintenance waste'' means materials collected while 
    maintaining and operating the facility, including, but not limited to, 
    soot, machinery deposits, scraped paint, deck sweepings, wiping wastes, 
    and rags.
        37. ``Maximum Hourly Rate'' means the greatest number of barrels of 
    drilling fluids discharged within one hour, expressed as barrels per 
    hour.
        38. ``Muds, Cuttings, and Cement at the Seafloor'' means discharges 
    that occur at the seafloor prior to installation of the marine riser 
    and during marine riser disconnect, well abandonment and plugging 
    operations.
        39. ``National Pollutant Discharge Elimination System'' (NPDES) 
    means the national program for issuing, modifying, revoking, and 
    reissuing, terminating, monitoring, and enforcing permits, and imposing 
    and enforcing pretreatment requirements, under section 307, 318, 402, 
    and 405 of the Act.
        40. ``New Source'' means any facility or activity that meets the 
    definition of ``new source'' under 40 CFR 122.2 and meets the criteria 
    for determination of new sources under 40 CFR 122.29(b) applied 
    consistently with all of the following definitions:
        a. The term ``water area'' as used in the term ``site'' in 40 CFR 
    122.29 and 122.2 shall mean the water area and ocean floor beneath any 
    exploratory, development, or production facility where such facility is 
    conducting its exploratory, development, or production activities.
        b. The term ``significant site preparation work'' as used in 40 CFR 
    122.29 shall mean the process of surveying, clearing, or preparing an 
    area of the ocean floor for the purpose of constructing or placing a 
    development or production facility on or over the site.
        41. ``No Activity Zones'' means those areas identified by the 
    Minerals Management Service (MMS) where no structures, drilling rigs, 
    or pipelines will be allowed. Those zones are identified as lease 
    stipulations in U.S. Department of Interior, MMS, August, 1990, 
    Environmental Impact Statement for Sales 131, 135, and 137, Western, 
    Central, and Eastern Gulf of Mexico. Additional no activity areas may 
    be identified by MMS during the life of this permit.
        42. ``Operational waste'' means all cargo associated waste, 
    maintenance waste, cargo residues, and ashes and clinkers from 
    incinerators and coal burning boilers.
        43. ``Packer Fluid'' means low solids fluids between the packer, 
    production string and well casing. They are considered to be workover 
    fluids.
        44. ``Priority Pollutants'' means those chemicals or elements 
    identified by EPA, pursuant to section 307 of the Clean Water Act and 
    40 CFR 401.15.
        45. ``Produced Sand'' means slurried particles used in hydraulic 
    fracturing, the accumulated formation sands, and scale particles 
    generated during production. Produced sand also includes desander 
    discharge from produced water waste stream and blowdown of water phase 
    from the produced water treating system.
        46. ``Produced Water'' means the water (brine) brought up from the 
    hydrocarbon-bearing strata during the extraction of oil and gas, and 
    can include formation water, injection water, and any chemicals added 
    downhole or during the oil/water separation process.
        47. ``Production Facility'' means any fixed or mobile structure 
    that is either engaged in well completion or used for active recovery 
    of hydrocarbons from producing formations.
        48. ``Sanitary Waste'' means human body waste discharged from 
    toilets and urinals.
        49. ``Severe property damage'' means substantial physical damage to 
    property, damage to the treatment facilities which cause them to become 
    inoperable, or substantial and permanent loss of natural resources 
    which can reasonably be expected to occur in the absence of a bypass. 
    Severe property damage does not mean economic loss caused by delays in 
    production.
        50. ``Sheen'' means a silvery or metallic sheen, gloss, or 
    increased reflectivity, visual color or iridescence on the water 
    surface.
        51. ``Source Water and Sand'' means water from non-hydrocarbon 
    bearing formations for the purpose of pressure maintenance or secondary 
    recovery including the entrained solids.
        52. ``Spotting'' means the process of adding a lubricant (spot) 
    downhole to free stuck pipe.
        53. Synthetic Drilling Fluid'' means a drilling fluids which has 
    synthetic material as its continuous phase with water as the dispersed 
    phase.
        54. ``Territorial Seas'' means the belt of the seas measured from 
    the line of ordinary low water along that portion of the coast which is 
    in direct contact with the open sea and the line marking the
    
    [[Page 58735]]
    
    seaward limit of inland waters, and extending seaward a distance of 
    three miles.
        55. ``Trace Amounts'' means that if materials added downhole as 
    well treatment, completion, or workover fluids do not contain priority 
    pollutants then the discharge is assumed not to contain priority 
    pollutants, except possibly in trace amounts.
        56. ``Treatment Chemicals'' means biocides, corrosion inhibitors, 
    or other chemicals which are used to treat seawater or freshwater to 
    prevent corrosion or fouling of piping or equipement.
        57. ``Uncontaminated Ballast/Bilge Water'' means seawater added or 
    removed to maintain proper draft.
        58. ``Uncontaminated Freshwater'' means freshwater which is 
    discharged without the addition of chemicals; included are (1) 
    discharges of excess freshwater that permit the continuous operation of 
    fire control and utility lift pumps, (2) excess freshwater from 
    pressure maintenance and secondary recovery projects, (3) water red 
    during training and testing of personnel in fire protection, and (4) 
    water used to pressure test new piping.
        59. ``Uncontaminated Seawater'' means seawater which is returned to 
    the sea without the addition of chemicals. Included are (1) discharges 
    of excess seawater which permit the continuous operation of fire 
    control and utility lift pumps (2) excess seawater from pressure 
    maintenance and secondary recovery projects (3) water red during the 
    training and testing of personnel in fire protection (4) seawater used 
    to pressure test piping, and (5) once through noncontact cooling water 
    which has not been treated with biocides.
        60. ``Upset'' means an exceptional incident in which there is 
    unintentional and temporary noncompliance with technology-based permit 
    effluent limitations because of factors beyond the reasonable control 
    of the permittee. An upset does not include noncompliance to the extent 
    caused by operational error, improperly designed treatment facilities, 
    inadequate treatment facilities, lack of preventive maintenance, or 
    careless or improper operation.
        61. ``Well Treatment Fluids'' mean any fluid used to restore or 
    improve productivity by chemically or physically altering hydrocarbon-
    bearing strata after a well has been drilled. These fluids move into 
    the formation and return to the surface as a slug with the produced 
    water. Stimulation fluids include substances such as acids, solvents, 
    and propping agents.
        62. ``Workover Fluids'' mean salt solutions, weighted brines, 
    polymers, and other specialty additives used in a producing well to 
    allow safe repair and maintenance or abandonment procedures. High 
    solids drilling fluids used during workover operations are not 
    considered workover fluids by definition and therefore must meet 
    drilling fluid effluent limitations before discharge may occur. Packer 
    fluids, low solids fluids between the packer, production string and 
    well casing, are considered to be workover fluids and must meet only 
    the effluent requirements imposed on workover fluids.
        63. The term ``MGD'' shall mean million gallons per day.
        64. The term ``mg/l'' shall mean milligrams per liter or parts per 
    million (ppm).
        65. The term ``ug/l'' shall mean micrograms per liter or parts per 
    billion (ppb).
    
              Table 1-A.--Critical Dilutions (Percent Effluent) for Toxicity Limitations for Seawater to Which Treatment Chemicals Have Been Added
    --------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                     Pipe diameter
              Depth difference** (meters)                  Discharge rate (bbl/day)       ------------------------------------------------------------------
                                                                                             >0'' to 2''      >2'' to 4''      >4'' to 6''         >6''
    --------------------------------------------------------------------------------------------------------------------------------------------------------
    0 to 5........................................  0 to 1,000...........................             15.6             19.4            6.15             15.4
                                                    >1,000 to 10,000.....................             22.6             29.5          *10.3              56
                                                    >10,000..............................  ...............             31             46.3              46
    >5 to 10......................................  0 to 1,000...........................             15.3             33             59                10.3
                                                    >1,000 to 10,000.....................             11.2             25             44                73.3
                                                    >10,000..............................  ...............             24.7           39.6              78
    >10 to 20.....................................  0 to 1,000...........................             15               32.4           56.5            * 12.3
                                                    >1,000 to 10,000.....................             11.3             25             40                56.5
                                                    >10,000..............................  ...............             22.6           36.2              57
    >20...........................................  0 to 1,000...........................             16.3             33             57              * 10.7
                                                    >1,000 to 10,000.....................             11.6             25.6           39.6              57.8
                                                    >10,000..............................  ...............             22.6           36.6              51
    --------------------------------------------------------------------------------------------------------------------------------------------------------
    * Those critical dilutions which are followed by an asteric are required to be monitored using a chronic test.
    ** Depth Difference means the distance in water depth between the discharge pipe and the seafloor.
    
    
             Table 1-B.-- Critical Dilutions (Percent Effluent) for Toxicity Limitations for Freshwater to Which Treatment Chemicals Have Been Added
    --------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                     Pipe diameter
              Depth difference  (meters)                  Discharge rate (bbl/day)       -------------------------------------------------------------------
                                                                                            >0'' to 2''      >2'' to 4''      >4'' to 6''          >6''
    --------------------------------------------------------------------------------------------------------------------------------------------------------
    All..........................................  0 to 1,000...........................              7.2              8.2             17.4             18
                                                   >1,000 to 10,000.....................             17               76             * 11.4           * 13.1
                                                   >10,000..............................  ...............             64               93             * 18
    --------------------------------------------------------------------------------------------------------------------------------------------------------
    * Those critical dilutions which are followed by an asteric are required to be monitored using a chronic test.
    
    
    [[Page 58736]]
    
    
                                            Table 2.--Effluent Limitations, Prohibitions and Monitoring Requirements
    --------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                  Monitoring requirement
                                        Regulated and monitored     Discharge limitation/   ----------------------------------------------------------------
                Discharge                 discharged parameter           prohibition              Measurement
                                                                                                   frequency        Sample type method    Recorded value(s)
    --------------------------------------------------------------------------------------------------------------------------------------------------------
    Drilling Fluids..................  Free Oil.................  No free oil..............  Onceweek(*1)........  Static sheen........  Number of days
                                                                                                                                          sheen observed.
                                       Toxicity(*2) 96-hr LC50..  30,000 ppm daily minimum.  Once/month..........  Grab................  96-hr LC50.
                                                                  30,000 ppm monthly         Once/end well(*3)...  Grab................  96-hr LC50.
                                                                   average minimum.
                                                                                             Once/month..........  Grab................  96-hr LC50.
                                       Discharge Rate...........  1,000 barrels/hour.......  Once/hour(*1).......  Estimate............  Max hourly rate.
                                       Discharge Rate for         (*4).....................  Once/hour(*1).......  Measure.............  Max hourly rate.
                                        controlled discharge
                                        rate areas.
                                       Mercury and cadmium......  No discharge of drilling   Once prior to         Absorption Spectro-   mg mercury/kg
                                                                   fluids to which barite     drilling each well    photometry.           barite.
                                                                   has been added, if such    (*6).                                      mg cadmium/kg
                                                                   barite contains mercury                                                barite.
                                                                   in excess of 1.0 mg/kg
                                                                   or cadmium in excess of
                                                                   3.0 mg/kg (dry weight).
                                       Oil Based or Inverse       No discharge.............
                                        Emulsion Drilling Fluids.
                                       Oil Contaminated Drilling  No discharge.............
                                        Fluids.
                                       Diesel Oil...............  No discharge of drilling
                                                                   fluids to which diesel
                                                                   oil has been added.
                                       Mineral Oil..............  Mineral oil may be used
                                                                   only as a carrier fluid
                                                                   (transporter fluid),
                                                                   lubricity additive, or
                                                                   pill.
    Drilling Cuttings................  Free oil.................  No free oil..............  Once/week(*1).......  Static sheen........  Number of days
                                                                                                                                          sheen observed.
                                       Toxicity(*2) 96-hr LC50..  No discharge of cuttings
                                                                   generated using drilling
                                                                   fluids which exhibit a
                                                                   toxicity of less than
                                                                   30,000 ppm daily minimum
                                                                   or 30,000 ppm monthly
                                                                   avg minimum.
                                       Mercury and cadmium......  No discharge of cuttings
                                                                   generated using drilling
                                                                   fluids to which barite
                                                                   has been added, if such
                                                                   barite contains mercury
                                                                   in excess of 1.0 mg/kg
                                                                   or cadmium in excess of
                                                                   3.0 mg/kg (dry weight).
                                       Cuttings generated using   No discharge.
                                        Oil Based or Inverse
                                        Emulsion Drilling Fluids.
                                       Cuttings generated using   No discharge.
                                        Oil Contaminated
                                        Drilling Fluids.
                                       Cuttings generated using   No discharge.
                                        drilling fluids to which
                                        Diesel Oil has been
                                        added.
                                       Cuttings generated using   Mineral oil may be used
                                        drilling fluids to which   only as a carrier fluid
                                        Mineral Oil has been       (transporter fluid),
                                        added.                     lubricity additive, or
                                                                   pill.
    Deck Drainage....................  Free Oil.................  No free oil..............  Once/day (*7).......  Visual sheen........  Number of days
                                                                                                                                          sheen observed.
    Produced Sand....................  No Discharge.
    Well treatment fluids, completion  Free oil.................  No free oil..............  Once/Day (*1).......  Static sheen........  Number of days
     fluids, and workover fluids                                                                                                          sheen observed.
     (includes packer fluids) (*10).
    
    [[Page 58737]]
    
                                       Oil and Grease...........  42 mg/l daily max.,......  Once/month..........  Grab (*8)...........  Daily max, monthly
                                                                  29 mg/l monthly avg.                                                    average.
    Sanitary waste (*12) continuously  Residual chlorine (*13)..  1 mg/l (minimum).........  Once/month..........  Grab................  Concentration.
     manned by 10 or more persons.
                                       Solids...................  No Floating Solids.......  Once/Day............  Observation(*15)....  Number of days
                                                                                                                                          solids observed.
    Sanitary waste (*12) continuously  Solids...................  No floating solids.......  Once/day............  Observation (*15)...  Number of days
     manned by 9 or fewer persons or                                                                                                      solids observed.
     intermittently by any number.
    Domestic waste (*14).............  Solids...................  No floating solids or      Once/day............  Observation(*15)....  Number of days
                                                                   foam.                                                                  observed.
    Miscellaneous discharges:          Free oil.................  No free oil..............  Once/week (*11).....  Visual sheen........  Number of days
     Desalinization unit discharge;                                                                                                       sheen observed.
     blowout pre-venter fluid;
     uncontaminated ballast water;
     uncontaminated bilge water;
     uncontaminated freshwater; mud,
     cuttings and cement at seafloor;
     uncontaminated seawater; boiler
     blow-down; source water and
     sand; diatomaceous earth filter
     media; excess cement slurry.
    Miscellaneous discharges of        Treatment chemicals......  Most stringent of: EPA
     seawater and freshwater to which                              label registration,
     treatment chemicals have been                                 maximum manufacturers
     added: excess seawater which                                  recommended dose, or 500
     permits the continuous operation                              mg/l.
     of fire control and utility lift
     pumps, excess seawater from
     pressure maint. and secondary
     recovery prjcts, water red
     during training of personnel in
     fire protection, seawater used
     to pressure test new piping and
     new pipelines, ballast water,
     once-through non-contact cooling
     water, desalinization unit.
                                       Free oil.................  No free oil..............  1/Week..............  Visible sheen.......  Number of days
                                                                                                                                          sheen observed.
                                       Toxicity.................  48-hour average min NOEC   Rate Dependent (*17)  Grab................  Lowest NOEC
                                                                   and monthly avg minimum                                                observed for
                                                                   NOEC (*5).                                                             either of the two
                                                                                                                                          species.
    --------------------------------------------------------------------------------------------------------------------------------------------------------
    *1 When discharging.
    *2 Suspended particulate phase (SPP) with Mysidopsis bahia following approved test method. The sample shall be taken beneath the shale shaker; or if
      there are no returns across the shaker then the sample must be taken from a location that is characteristic of the overall mud system to be
      discharged.
    *3 Sample shall be taken after the final log run is completed and prior to bulk discharge.
    *4 See Part I.B.1.b of this permit.
    *5 See Appendix A, Table 1 of this permit.
    *6 Analyses shall be conducted on each new stock of barite used.
    *7 When discharging and facility is manned. Monitoring shall be accomplished during times when observation of a visual sheen on the surface of the
      receiving water is possible in the vicinity of the discharge.
    *8 May be based on the arithmetic average of four grab sample results in a 24 hr. period.
    *10 No discharge of priority pollutants except in trace amounts. Information on the specific chemical composition shall be recorded but not reported
      unless requested by EPA.
    
    [[Page 58738]]
    
    *11 When discharging for muds, cuttings, and cement at the seafloor and blowout preventer fluid. All other miscellaneous discharges: when discharging,
      discharge is authorized only during times when visual sheen observation is possible, unless the static sheen method is used. Uncontaminated seawater
      uncontaminated freshwater, source water and source sand, uncontaminated bilge water, and uncontaminated ballast water from platforms on automatic
      purge systems may be discharged without monitoring from platforms which are not manned.
    *12 Any facility which properly operates and maintains a marine sanitation device (MSD) that complies with pollution control standards and regulations
      under section 312 of the Act shall be deemed to be in compliance with permit limitations for sanitary waste. The MSD shall be tested yearly for proper
      operation, and test results maintained at the facility.
    *13 Hach method CN-66 DPD approved. Minimum of 1 mg/l and maintained as close to this concentration as possible.
    *14 The discharge of food waste is prohibited within 12 nautical miles from nearest land. Comminuted food waste able to pass through a 25 mm mesh screen
      (approximately 1 inch) may be discharged more than 12 nautical miles from nearest land.
    *15 Monitoring shall be accomplished during daylight by visual observation of the surface of the receiving water in the vicinity of sanitary and
      domestic waste outfalls. Observations shall be made following either the morning or midday meals at a time of maximum estimated discharge.
    *16 Once/year for discharges from 0 bbl/day to 4599 bbl/day, once/calendar quarter for discharges of 4,600 bbl/day and greater.
    *17 See Part I.B.1.1b of this permit.
    
    [FR Doc 98-29307 Filed 10-30-98; 8:45 am]
    BILLING CODE 6560-50-P
    
    
    

Document Information

Published:
11/02/1998
Department:
Environmental Protection Agency
Entry Type:
Notice
Action:
Notice of Final NPDES General Permit.
Document Number:
98-29307
Pages:
58722-58738 (17 pages)
Docket Numbers:
FRL-6182-7
PDF File:
98-29307.pdf