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§ 52.016  NATIONAL CATEGORICAL PRETREATMENT STANDARDS.
   The categorical pretreatment standards found at 40 C.F.R. Chapter I, Subchapter N, parts 405 through 471 are hereby incorporated.
   (A)   Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the Wastewater Superintendent may impose equivalent concentration or mass limits in accordance with 40 C.F.R. § 403.6(c).
   (B)   When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Wastewater Superintendent shall impose an alternate limit using the combined waste stream formula in 40 C.F.R. § 403.6(e).
   (C)   A user may obtain a variance from a categorical pretreatment standard if the user can prove, pursuant to the procedural and substantive provisions in 40 C.F.R. § 403.13, that factors relating to its discharge are fundamentally different from the factors considered by EPA when developing the categorical pretreatment standard.
   (D)   A user may obtain a net gross adjustment to a categorical standard in accordance with 40 C.F.R. § 403.15.
(1996 Code, § 168-6)  Penalty, see § 52.999
§ 52.017  STATE PRETREATMENT STANDARDS.
   In the event that pretreatment standards are adopted by the state, this chapter shall incorporate the stricter of the standards.
(1996 Code, § 168-7)
§ 52.018  LOCAL LIMITS.
   (A)   The town may apply local limits through issuance of industrial user permits as provided in this chapter.
   (B)   The town may apply local limits based on EPA categorical pretreatment standards, water quality standards or criteria, treatment plant process inhibitions, or sludge disposal standards as necessary to comply with the general prohibitions against pass-through, interference and sludge contamination in 40 C.F.R. part 403 and VR 680-14-01, part VII.
(1996 Code, § 168-8)
§ 52.019  RIGHT OF REVISION.
   The town reserves the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the POTW.
(1996 Code, § 168-9)
§ 52.020  DILUTION.
   (A)   No industrial user shall ever increase the use of process water, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limitation unless expressly authorized by an applicable pretreatment standard or requirement.
   (B)   The Wastewater Superintendent may impose mass limitations on industrial users which are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.
(1996 Code, § 168-10)  Penalty, see § 52.999
PRETREATMENT OF WASTEWATER
§ 52.035  PRETREATMENT FACILITIES.
   (A)   Industrial users shall provide wastewater treatment as necessary to comply with this chapter and shall achieve compliance with all categorical pretreatment standards, local limits and the prohibitions set out in §§ 52.015 through 52.020 within the time limitations specified by the EPA, the commonwealth or the Wastewater Superintendent, whichever is more stringent.
   (B)   Any facilities necessary for compliance shall be provided, operated and maintained at the user’s expense. Detailed plans describing the pretreatment facilities and operating procedures shall be submitted to the Wastewater Superintendent for review and approval, and shall be acceptable to the Wastewater Superintendent before construction of the facilities begin.
   (C)   The review of such plans and operating procedures will in no way relieve the user from the responsibility of modifying the facilities as necessary to produce a discharge acceptable to the town under the provisions of this chapter.
(1996 Code, § 168-11)  Penalty, see § 52.999
§ 52.036  ADDITIONAL PRETREATMENT MEASURES.
   (A)   Whenever deemed necessary, the Wastewater Superintendent may require industrial users to restrict their discharge during peak flow periods, designate that certain wastewater be discharged only into specific sewers, relocate and/or consolidate points of discharge, separate sewage waste streams from industrial waste streams, and such other conditions as may be necessary to protect the POTW and determine the industrial user’s compliance with the requirements of this chapter.
   (B)   The Wastewater Superintendent may require any person discharging into the POTW to install and maintain, on their property and at their expense, a suitable storage and flow-control facility to ensure equalization of flow. A wastewater discharge permit may be issued solely for flow equalization.
   (C)   Grease, oil and sand interceptors shall be provided when, in the opinion of the Wastewater Superintendent, they are necessary for the proper handling of wastewater containing excessive amounts of grease and oil, or sand; except that such interceptors shall not be required for residential users. All interception units shall be of type and capacity approved by the Wastewater Superintendent and shall be so located to be easily accessible for cleaning and inspection. Such interceptors shall be inspected, cleaned and repaired regularly, as needed, by the user at his or her expense.
   (D)   Users with the potential to discharge flammable substances may be required to install and maintain one or more approved combustible gas detection meters.
(1996 Code, § 168-12)  Penalty, see § 52.999
§ 52.037  ACCIDENTAL DISCHARGE/SLUG CONTROL PLANS.
   (A)   At least once every two years, the Wastewater Superintendent shall evaluate whether each user needs an accidental discharge/slug control plan.
   (B)   The Wastewater Superintendent may require any user to develop, submit for approval and implement such a plan.
   (C)   Alternatively, the Wastewater Superintendent may develop such a plan for any user.
   (D)   An accidental discharge/slug control plan shall address, at a minimum, the following:
      (1)   Description of discharge practices, including non-routine batch discharges;
      (2)   Description of stored chemicals;
      (3)   Procedures for immediately notifying the POTW of any accidental or slug discharge. As required by §§ 52.090 through 52.103, such notification must also be given for any discharge which would violate any of the prohibited discharges in §§ 52.015 through 52.020; and
      (4)   Procedures to prevent adverse impact from any accidental or slug discharge. Such procedures include, but are not limited to, inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants, including solvents, and/or measures and equipment for emergency response.
(1996 Code, § 168-13)  Penalty, see § 52.999
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