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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER NO <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> CARPENTER COMPANY <br /> TRUCK WASH WATER DISPOSAL SITE <br /> LATHROP. SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board. Central Valley_ Region. (hereafter Board) finds f�\i <br /> that: <br /> 1. Carpenter Company (hereafter Discharger) submitted a Report of Waste Discharge, dated <br /> 28 June 1995, for its wastewater and disposal facility. The property (Assessor's Parcel No. 198- <br /> 12-04) is owned by Carpenter Company. <br /> 2. The Discharger proposes to discharge 400 gallons.of wash water from truck washing once every <br /> two weeks to an existing storm water detention pond. The detention pond has a surface area of <br /> 5.5 acres and a capacity of 16.4 acre-ft (5.3 million gallons). The percolation rate was estimated /L\ <br /> at 15 to 17 gallons per square foot per day. The detention pond has the capacity to retain 218 /o <br /> of a 48-hour duration storm with a 10 year frequency. Depth to the ground water is :7, <br /> approximately 8.0 feet. Detergents will be used in washing the trucks and trailers. The following <br /> is a grab sample characteristics of the wash water: <br /> Constituents Results <br /> pH 7.1 <br /> Suspended Solids 250 med <br /> Electrical Conductivity 2500 µmhosicm <br /> Oil and Grease 17 m`_wl <br /> r <br /> Arsenic 4 7 ug,l = <br /> Chromium 58 4iLd <br /> Copper 0.1 uz l <br /> Cadmium 120 ugii <br /> Lead ''20 µg 1 \` <br /> Nickel 72 ugil <br /> 3. Annual precipitation in the area is approximately 13.95 inches. The State Water Resources <br /> Control Board adopted Water Quality Order No. 92-12-DWQ on 18 September 1992 which = <br /> amended Waste Discharge Requirements Water Quality Order No. 91-13-DWQ. NPDES General!= <br /> Permit No. CAS000001. for Discharges of Storm Water Associated with Industrial Activities <br /> (hereafter General Permit). Facilities requiring coverage by the General Permit are listed by <br /> Standard Industrial Classification (SIC) in 40 Code of Federal Regulations (CFR), Section 122.26 <br /> (b) (14). and are required to submit a Notice of Intent (NOD to comply with the terms of the <br />