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Stockton Pl ting, Inc. also repairs urethane bumpers in the south building. The bumpers ar reformed into the desired shape, sanded, cleaned, and painted. The "job sh p" is located near the aluminum shop in the central north area of the facility. Cu tom parts are manufactured, repaired, cleaned and prepared for plating. Th "job shop" is a metal shop with lathes, drill presses, and all the necessary m chinery required for metal working and parts manufacturing. VI. HAZARDO S WASTE ACTIVITY DESCRIPTION: The plating peration generates the majority of the manifested hazardous waste at this facility. To a lesser extent, hazardous waste is generated by grinding and sanding met 1 bumpers and parts; painting urethane bumpers, machine maintenanc and facility maintenance, upgrade, and repair. The plating peration generates a liquid wastestream which flows to an onsite pretreatmen system. The waste consists of rinsewater, drag out, and cleaners. The wastest ams are individually piped from the production departments directly to the pretr atment area. Two of the three wastestreams, cyanide and chromium drag out, ar piped through a separate four-inch line into a cyanide sump and a chromium a id sump. The cleaners and the heavy metals, copper and nickel, are piped throu a six-inch line into a heavy metal sump. This is the beginning of the pretreat ent process. The wastes are recycled into usable products or converted to a sludge which is pressed to form a filter cake. The wastewater is treated and isposed of to the sanitary sewer system and the filter cake is manifested o site as hazardous waste to Encycle/Texas Inc., 5500 Up River Rd., Corpus Chri ty, TX 78407. The waste is transported by Great Western Chemical, CAD 981382 43. In 1993, 39.951 tons of filter cake was manifested for recycling. The grinding and sanding of metal coated bumpers and other parts generates a metal contarr inated dust or sandy waste. These wastestreams were characterized as hazardous waste by An Lab, 1910 S St., Sacramento, CA 95814 (report date-- May 10, 199 ). Prior test results, prepared by Canonie Lab, were submitted by Robert Hunt ey on June 8, 1993. These results also indicate that a sample obtained fro the "Job Production" line on January 28, 1991, was above the Total Threshold Li it Concentration (TTLC) for copper and zinc. Levels are reported at 7860 and 490 mg/kg, respectively. The TTLC values set in 22 CCR, Chapter 11, Article 3, Section 66261.24 (a) (2) (A) Table II are 2,500 mg/kg for copper and 5,000 mg1g for zinc. In addition tc the Canonie Lab and An Lab results, Roy F. Weston Lab prepared a report date July 13, 1992, which indicates zinc at 3100 mg/kg. This sample was obtained frothe "Job Production" polishing area and analyzed using the Waste Extraction T t (WET). Constituent levels above the Soluble Threshold Limit Concentratio (STLC) are considered hazardous. The STLC for zinc is 250 mg/1. On the June , 1992 inspection conducted by Eleanor Ratliff, Robert Huntley stated that n analysis had been performed to determine if the sand blast sand or 3