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(a) All machine shops shall be operated in accordance with the following standards:
(1) No person shall dispose of, nor permit the disposal, directly or indirectly, of machine shop fluids, hazardous materials, mop water, or rinse water from parts cleaning or deburring/tumbling operations into storm drains;
(2) No person shall dispose of machine shop fluids or rinse water from parts cleaning or deburring/tumbling operations into the sanitary sewer system except pursuant to an industrial waste discharge permit obtained in accordance with this chapter;
(3) No machine shop shall contain floor drains, excepting only such floor drains as are connected to wastewater pretreatment systems for which an industrial waste discharge permit has been obtained in accordance with this chapter;
(4) Machine shops shall be cleaned using only those methods of cleaning which ensure that no materials are discharged to the storm drain system or to the sanitary sewer system, except for wastewater that is discharged to the sanitary sewer system pursuant to an industrial waste discharge permit obtained in accordance with this chapter; provided, however, that a permit shall not be required for facilities that use the following three-step sequence for cleaning floors, or an approved equivalent:
(A) Clean up spills with rags or other absorbent materials;
(B) Sweep floor using dry absorbent material; and
(C) Mop floor. Mop water shall be discharged to the sanitary sewer via a toilet or sink;
(5) All owners and operators or machine shops shall ensure that spill prevention, clean-up equipment and absorbent materials are kept in stock at all times and are readily available for use;
(6) All owners and operators of machine shops shall post or cause to be posted signs on all storm drain inlets located on the property of the facility with the words “No Dumping - Flows to Bay” or equivalent; and
(7) All owners and operators of machine shops shall ensure that all employees who work directly on machine operations or clean up of such facilities are trained, upon hiring and annually thereafter, regarding best management practices for machine shops in accordance with guidelines issued and published by the superintendent.
(b) The maximum allowable limit for copper for machine shop discharge shall be 2.0 mg/liter.
(Ord. 5084 § 2 (part), 2010)