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• STT.TE OF CALIFORNIA �/• GEORGE DEUKMEJIAN, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION aj <br /> 3443 ROUTIER ROAD, SUITE A y� �,jTtt pppttt,,,... <br /> SACRAMENTO. CA 95827-3098 9 9 �9 t, <br /> July 16, 1990 J U L 18 1991 CERTIFIED MAIL <br /> ENVIRONMENTAL HEALTi-. P 354 403 640 <br /> PERWT%SERV!CES <br /> Mr. Kirk Moon <br /> U. S. Chemical Company <br /> 1448 Shaw Road <br /> Stockton, California 95205 <br /> TOXIC PITS CLEANUP ACT REQUIREMENTS AND NOTIFICATAVIIT-r, Of HYDROGEOLUGICAL <br /> ASSESSMENT REPORT DUE BY 31 JANUARY 1991, U. S. CHEMICAL COMPANY (USC) , <br /> STOCKTON, TPCA #05-014 <br /> We have reviewed the recent waste characterization and aquatic toxicity <br /> testing of the surface impoundment wastewater and sludges performed by both <br /> the Regional Board and the California Department of Health Services. Based on <br /> the data, we have determined that your facility is regulated by the Toxic Pits <br /> Cleanup Act (TPCA) , Section 25208 et al . , California Health and Safety Code <br /> (H&SC) . <br /> This letter is to inform you of the regulations contained in the TPCA and your <br /> obligations incurred under the act. Under this law owners/operators of <br /> surface impoundments containing hazardous wastes were required to comply with <br /> the following: <br /> (1) Submit a complete Hydrogeological Assessment Report by 1 January <br /> 1988, pursuant to Section 25208.7(b) ; <br /> (2) Cease discharge by 30 June 1988 and close the surface impoundment <br /> if the impoundment leaked, pursuant to Section 25208.4(a) ; <br /> (3) Pay required fees, Section 25208.3. <br /> The statutory deadlines for these requirements has obviously passed. During <br /> the 1 June 1990 meeting held at your office we agreed to allow USC reasonable <br /> time to complete a Hydrogeological Assessment Report. Also discussed was <br /> closure of the surface impoundment and possible retrofitting to Class II <br /> standards if the waste stream can be managed to preclude hazardous <br /> constituents from accumulating. <br /> USC's consultant, Harding Lawson Associates, submitted a Revised Waste <br /> Characterization Work Plan on 2 July 1990. We have approved the work plan and <br /> have provided comments under separate correspondence. A time schedule within <br /> the characterization work plan proposed field investigations, technical <br /> reports and dates. Laboratory analysis of the wastewater and sludge is <br /> scheduled to be completed in August 1990. The field investigation is <br /> scheduled to be submitted by 1 September 1990. The field investigation, which <br /> needs to include ground water and vadose zone data, is scheduled for <br /> completion during October 1990. The technical report evaluating the waste <br />