SCAQMD RULE 1176 SUMPS AND WASTEWATER SEPARATORS
LAST REVISED 05/13/94 


(Adopted November 3, 1989)(Amended January 5, 1990)
 (Amended May 13, 1994)
 
Rule 1176.     Sumps and Wastewater Separators 
               
 (a)     Purpose
     This rule is intended to limit volatile organic compound
      emissions from sumps, wastewater separators, separator
      forebays, process drains, sewer lines, and junction boxes
      located at oil production fields, refineries, chemical
      plants, and industrial facilities handling petroleum
      liquids.
       
(b)     Definitions
     (1)  CATCH BASIN is an open basin which serves as a single
           collection point for rainwater or stormwater run-off
           directly from ground surfaces, or for wastewater.
     (2)  CHEMICAL PLANT is any facility engaged in producing
           organic or inorganic chemicals, and/or manufacturing
           products by chemical processes.  Any facility or
           operation that has 282 as the first three digits in
           their Standard Industrial Classification Code as
           defined in the Standard Industrial Classification
           Manual is included.
          (3)  Closed Vent System is a system that is not open to the
           atmosphere and is composed of piping, connections,
           and, if necessary, flow-inducing devices that
           transport gas or vapor from an emission source to an
           air pollution control device.
            (4)  EXEMPT COMPOUNDS are any of the following
             compounds:
                (A)  Group I (General)
                    trifluoromethane (HFC-23)
                    pentafluoroethane (HFC-125)
                    1,1,2,2-tetrafluoroethane (HFC-134)
                    tetrafluoroethane (HFC-134a)
                    1,1,1-trifluoroethane (HFC-143a)
                    1,1-difluoroethane (HFC-152a)
                    chlorodifluoromethane (HCFC-22)
                    dichlorotrifluoroethane (HCFC-123)
                    2-chloro-1,1,1,2-tetrafluoroethane (HCFC-124)
                    dichlorofluoroethane (HCFC-141b)
                    chlorodifluoroethane (HCFC-142b)
                    cyclic, branched, or linear, completely
                       fluorinated alkanes
                    cyclic, branched, or linear, completely
                       fluorinated ethers with no unsaturations
                    cyclic, branched, or linear, completely
                       fluorinated tertiary amines with no
                       unsaturations
                    sulfur-containing perfluorocarbons with no
                       unsaturations and with sulfur bonds only to
                       carbon and fluorine
                        (B)  Group II 
                    methylene chloride
                    1,1,1-trichloroethane (methyl chloroform)
                    trifluoromethane (FC-23)
                    trichlorotrifluoroethane (CFC-113)
                    dichlorodifluoromethane (CFC-12)
                    trichlorofluoromethane (CFC-11)
                    dichlorotetrafluoroethane (CFC-114)
                    chloropentafluoroethane (CFC-115)
          The use of Group II compounds and/or carbon
          tetrachloride may be restricted in the future 
           because they are toxic, potentially toxic, upper-
           atmosphere ozone depleters, or cause other
           environmental impacts.  By January 1, 1996,
           chlorofluorocarbons (CFC), 1,1,1,-trichloroethane
           (methyl chloroform), and carbon tetrachloride will be
           phased out in accordance with the Code of Federal
           Regulations Title 40, Part 82 (December 10, 1993).
          (5)  Fixed Cover is any cover made out of metal(s),
           polymer(s), or other material, and installed in a
           permanent position over the liquid.
          (6)  Floating Cover is any cover made out of metal(s),
           polymer(s), or other material, which is in contact
           with a liquid surface at all times.
          (7)  INDUSTRIAL FACILITIES are those engaged in the
           production and distribution of natural gas, pipeline
           distribution or wholesale distribution of crude
           petroleum and petroleum products except gasoline, as
           classified under the Standard Industrial
           Classification group numbers 492, 461, or 517,
           respectively, of the Standard Industrial
           Classification Manual.
          (8)  JUNCTION BOX is a manhole or access point to a
           wastewater sewer system line.
          (9)  OIL PRODUCTION FIELD is a facility on which crude
           petroleum production and handling are conducted, as
           defined in the Standard Industrial Classification
           Manual as Industry No. 1311, Crude Petroleum and
           Natural Gas.
          (10) REFINERY is a facility that processes petroleum, as
           defined in the Standard Industrial Classification
           Manual as Industry No. 2911, Petroleum Refining.
          (11) RIGID FLOATING COVER is a floating cover made out of
           non-flexible materials.
          (12) Separator Forebay is that section of a gravity-type
           separator which receives the untreated contaminated
           waste water from the preseparator flume and acts as
           a header which distributes the influent to the
           separator channels.
          (13) SEWER LINE is a lateral trunk line, branch line,
           ditch, channel, or other conduit used to convey
           wastewater to downstream oil-water separators.
          (14) Sump is a surface impoundment or excavated depression
           in the ground, lined or unlined, that is used for
           separating oil or other organic liquids, water, and
           solids.  A sump is classified as:
                   (A)  Primary or First Stage Production Sump is any sump
                which receives a stream of crude oil and
                produced water directly from oil production
                wells or field gathering systems.
               (B)  Secondary or Second Stage Sump is any sump which
                receives a waste water stream from one or more
                primary sumps, a free water knockout device, or
                a tank as well as intermittent or emergency
                streams.
               (C)  Tertiary or Third Stage Sump is any sump which
                receives a waste water stream from the secondary
                sump or other separation processes.
           (15) volatile Organic Compound (VOC) is a chemical compound of
           carbon, excluding carbon monoxide, carbon dioxide,
           carbonic acid, metallic carbides or carbonates,
           ammonium carbonate, and the exempt compounds listed
           in subparagraph (b)(4) above.
           (16) Wastewater Separator is any device used to separate VOCs
           from the waste water.
 (c) General Requirements
     (1)  Primary sumps shall not be used.
           (2)  Secondary sumps, tertiary sumps, or wastewater
           separators shall be replaced by covered tanks which
           are approved by the Executive Officer's designee; or
           provided with any one of the following:
                (A)  A floating cover equipped with seals.  The
                floating cover and/or seals shall be replaced
                every five (5) years, unless the owner/operator
                can demonstrate to the satisfaction of the
                Executive Officer's designee that the floating
                cover and/or seals has never been in violation
                with the provisions of this rule.
               (B)  A fixed cover, equipped with a closed vent
                system that directs vapors to an air pollution
                control device, with a control efficiency of 95
                percent by weight or greater, measured according
                to the test method specified in subparagraph
                (g)(2).  The closed vent system shall not
                produce detectable VOC emissions in excess of
                500 ppm above background, measured according to
                the test method specified in subparagraph
                (g)(1).
               (C)  Any measure which is equivalent to, or more
                effective in reducing VOC emissions than the
                requirements of subparagraphs (c)(2)(A) or
                (c)(2)(B), with a control efficiency of 95
                percent by weight or greater, measured according
                to the test method specified in subparagraph
                (g)(2), as demonstrated by the applicant to the
                satisfaction of the Executive Officer's
                designee.
          (3)  The following shall not be used unless equipped and
           operated as specified below:
                 (A)  Separator forebays and sewer lines:
                    All interconnections with the receiving
                 wastewater separators shall be enclosed by fixed
                covers such that no liquid surface is exposed to
                the atmosphere.
               (B)  Process drains:
                    At any drain opening to the atmosphere, VOC
                emissions shall not exceed 500 ppm above
                background, measured according to the test
                method specified in subparagraph (g)(1).
               (C)  Junction boxes:
                    Junction boxes shall be totally enclosed with a
                solid, gasketed, fixed cover or a manhole cover. 
                Each fixed cover shall be permitted to have an
                open vent pipe no more than four (4) inches in
                diameter and at least three (3) feet in length. 
                Each manhole cover shall be permitted to have an
                opening no more than four (4) inches in
                diameter.
          (4)  Slop oil, oil-contaminated wastewater, or tar from a
           sump or wastewater separator shall be handled in a
           manner approved in writing by the Executive Officer's
           designee.
            
 (d)     Requirements for Covers
     Covers for secondary and tertiary sumps, and wastewater
      separators shall meet all of the following requirements:
          (1)  The cover material shall be impermeable to VOCs, and
           free from holes, tears, or openings.
          (2)  Drains on covers shall be provided with a slotted
           membrane fabric cover, or equivalent, over at least
           90 percent of the open area.
          (3)  Gauging or sampling devices on the compartment cover
           shall be covered.  The latter cover shall be kept
           closed, with no visible gaps between the cover and
           the compartment, except when the sampling device is
           being used.
          (4)  Hatches on covers shall be kept closed and free of
           gaps, except when opened for inspection, maintenance,
           or repair.
          (5)  The perimeter of a cover, except for a rigid floating
           cover, shall form a seal free of gaps with the
           foundation to which it is attached.
          (6)  A rigid floating cover shall be installed and 
           maintained such that the gap between the compartment
           or sump wall and the seal does not exceed 1/8 inch
           for a cumulative length of 97 percent of the
           perimeter of the compartment.  No gap between the
           wall and the seal shall exceed 1/2 inch.
(e) Operator Inspection and Maintenance Requirements
         (1)  Air pollution control device(s) required in
           subparagraph (c)(2)(B) shall be subjected to
           performance tests semiannually, for verification of
           control efficiency according to the test method
           specified in subparagraph (g)(2).
          (2)  Closed vent systems required in subparagraph
           (c)(2)(B) and process drains shall be inspected
           monthly for VOC emissions, according to the test
           method specified in subparagraph (g)(1).
          (3)  Defect(s) or leak(s) detected through either operator
           inspection or District inspection shall be repaired
           or rectified within three (3) calendar days of
           detection.  The repaired or replaced component shall
           be reinspected within 15 calendar days after the
           repair or replacement.
            
 (f)     Recordkeeping Requirements
     All records of operator inspections, performance tests,
      repairs, replacements, and reinspections shall be
      maintained at the facility for a period of two (2) years
      and made available to the District staff upon request.
       
 (g)     Test Methods
         (1)  Measurement of gaseous VOC concentration shall be
           conducted according to EPA Reference Method 21, using
           an appropriate analyzer calibrated with methane, at
           a distance of 1 cm or less from the source.  If the
           analyzer reading exceeds 500 ppm, an appropriate
           sample shall be taken for laboratory analysis
           according to EPA Method 25, as it exists on May 13,
           1994, and test procedures shall be performed in
           accordance with a protocol approved by the Executive
           Officer's designee.
          (2)  Measurement of control efficiency of an air pollution
           control device shall be conducted according to EPA
           Reference Method 25, as it exists on May 13, 1994,
           and test procedures shall be performed in accordance
           with a protocol approved by the Executive Officer's
           designee.
            
 (h)     Exemptions
     The provisions of this rule shall not apply to the
      following:
        (1)  Equipment which, if covered, would present safety
           hazards to plant personnel, as documented and
           established in a previous safety manual or policy,
           subject to approval by the Executive Officer's
           designee.
          (2)  Tanks, pressure-vacuum valves on tanks, and impound
           basins or spill containments around tanks.
          (3)  Hatches, which are subject to Rule 1173.
          (4)  Equipment that exclusively receive, hold, or
           discharge rainwater, stormwater runoff, or non-
           contact cooling water.
          (5)  Well cellars used in emergencies at oil production
           fields, if clean-up procedures are implemented within
           24 hours after each emergency occurrence and
           completed within ten (10) calendar days.
          (6)  Sumps or wastewater separators, if the VOC content of
           the liquid entering is less than 5 mg per liter, as
           determined by EPA Test Method 8240.  Sampling shall
           occur at the inlet to the sump or wastewater
           separator.
            
 (i)     Violation
     Any defect, leak, or condition detected through District
      inspection, that does not comply with the provisions of
      paragraphs (c) General Requirements, (d) Requirements for
      Covers, or (e) Operator Inspection and Maintenance
      Requirements, shall be a violation of this rule.
       
 (j)     Compliance Schedule
         (1)  Compliance with this rule shall be achieved no later
           than November 1, 1990, except where air pollution
           control device(s) must be constructed and operated to
           achieve compliance.
          (2)  Applications for permits to construct air pollution
           control device(s) must be submitted no later than May
           1, 1990.  For such cases, compliance shall be
           achieved no later than May 1, 1991.
            
 (k)     Rule 464 Applicability
      The provisions of Rule 464 shall be applicable to
      wastewater separators until full compliance with this rule
      is achieved, or until the dates specified in paragraph (j)
      Compliance Schedule, whichever is earlier.