RULE 414 Wastewater Separators - Adopted 4/18/72, Amended
                   6/26/79, 6/29/81, Renumbered 5/89, Amended 5/6/91

          I.    Applicability

                This Rule applies to wastewater separators as defined in
                this Rule.  The requirements of this Rule are not intended
                to apply to the separation of crude oil and water prior to
                custody transfer.

          II.   Definitions

                A.  Air Flotation Unit:  equipment used to remove
                    suspended matter, both oil and solid, from water by
                    dissolving air under pressure and then releasing the 
                    air at atmospheric pressure in a tank or basin.

                B.  Volatile Organic Compound (VOC):  any compound
                    containing at least one atom of carbon except for
                    the following exempt compounds:

                         Carbon Monoxide,
                         Carbon Dioxide,
                         Carbonic Acid,
                         Metallic Carbides or Carbonates,
                         Ammonium Carbonates,
                         Methylene Chloride,
                         Methyl Chloroform (1,1,1-trichloroethane),
                         CFC-113 (trichlorotrifluoroethane),
                         CFC-11 88, (2trichlorofluoromethane),
                         CFC-12 (dichlorodifluoromethane),
                         CFC-22 (chlorodifluoromethane),
                         FC-23 (trifluoromethane),
                         CFC-114 (dichlorotetrafluoroethane),
                         CFC-115 (chloropentafluoroethane),
                         HCFC-123 (dichlorotrifluoroethane),
                         HFC-134a (tetrafluoroethane),
                         HCFC-141b (dichlorofluoroethane), and
                         HCFC-142b (chlorodifluoroethane).

                C.  Wastewater Separator:  any device or piece of equipment
                    that is used to remove oil and associated chemicals 
                    from water, or any device, such as a flocculation tank,
                    clarifier, etc. that removes petroleum-derived compounds
                    from wastewater.

                D.  Wastewater Separator Forbay:  that section of a 
                    gravity-type wastewater separator which:  (a) receives 
                    the untreated, oil-water waste from the pre-separator 
                    flume; and (b) acts as a header which distributes the 
                    influent to the separator channels.

          III.  Exemptions

                A.  This Rule shall not apply to any wastewater separator
                    for which:

                                 f  x  v   exceeds 420,


                    A = the area to be covered in square feet

                    V = the oil recovery rate in gallons/day on a annual

                    f = the estimated fractional volume loss of oil and is
                          computed as:

                      = -.0663 + .000319 x (annual mean ambient
                          temperature F)

                        -[.000286 x (10% true boiling point, degree F)]

                        +[.00215 x (annual average influent
                          temperature F)]

                B.  Air Flotation Units

          IV.   Requirements

                A.  A person shall not use any compartment of any vessel 
                    or device operated for the recovery of oil or tar 
                    from effluent water, from any equipment which 
                    processes, refines, stores or handles petroleum or 
                    coal tar products unless such compartments is equipped 
                    with one of the following vapor loss control devices, 
                    except when gauging or sampling is taking place:

                    1.  A solid cover with all openings sealed and totally
                        enclosing the liquid contents of the compartment,
                        except for such breathing vents as are structurally
                        necessary; or

                    2.  A floating pontoon or double-deck type cover,
                        equipped with closure seals that have no holes or
                        tears, installed and maintained so that gaps 
                        between the compartment wall and seal shall not 
                        exceed 0.32 centimeters (1/8 inch) for an 
                        accumulative length of 97 percent of the perimeter 
                        of the tank, and shall not exceed 1.3 centimeters 
                        (1/2 inch) for an accumulative length of the 
                        remaining 3 percent of the perimeter of the tank.  
                        No gap between the compartment wall and the seal 
                        shall exceed 1.3 centimeters (1/2 inch); or

                    3.  A vapor recovery system with a combined collection
                        and control efficiency of at least 90% by weight.
                B.  Any gauging and sampling device in the compartment 
                    cover shall be equipped with a cover or lid.  The cover 
                    shall be in a closed position at all times, except when 
                    the device is in actual use.

                C.  All wastewater separator forbays shall be covered

                D.  Skimmed oil or tar removed from wastewater separating
                    devices shall be either charged to process units with
                    feed or transferred to a container with a control 
                    system with at least 90% control efficiency by weight.  
                    Control device must be under District permit.

          V.    Administrative Requirements

                A.  Test Methods

                    1.  Efficiency of VOC control device shall be 
                        determined by EPA Test Method 25 and analysis of 
                        halogenated exempt compounds shall be by ARB 
                        Method 422.

                    2.  Analysis of halogenated exempt compounds shall be 
                        by ARB Method 432.

                    3.  Where add-on control equipment is utilized,
                        collection efficiency shall be determined by the 
                        EPA document "Model Regulatory Language for Capture
                        Efficiency Testing" dated 8/3/90.

          VI.   Compliance Schedule

                A.  The owner or operator of any existing wastewater
                    separator, not previously subject to the requirements 
                    of this Rule, which requires modification to comply 
                    with this Rule must meet the following compliance 
                    1.  Submit applications for Authority to Construct by
                        January 1, 1992.

                    2.  Complete on site construction and achieve final
                        compliance by July 1, 1993.