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AGRICULTURAL PRODUCTS. COMPANY. Inc. 10144 EAST FRENCH CAMP ROAD MANTECA.CA 95336 209:952-1031 June 5, 1986 Renaldo Crooks, R.S. Environmental Health Division San Joaquin Local Health District 1601 E. Hazelton Avenue P.O. Box 2009 Stockton, CA. 95201 Dear Sir: The following is a proposal to begin closure procedures for the underground pesticide rinse water tank located at the Union Carbide Research Station, 10144 E. French Camp Road, Manteca, CA. 95336. The engineering firm we are proposing to use for the tank closure and laboratory analysis of soil samples is J. H. Kleinfelder and Associates, 9795 Business Park Drive, Suite D, Sacramento, Ca. 95827. Their classification number is C61D09 and license number is 467252. The tank in question is a 1250 gallon fiberglass tank located underneath one of the buildings at the above site. This tank was installed in 1980 prior to construction of the building in 1981 and has been used each year to temporarily store very dilute quantities of pesticide rinse water. The contents of the tank varied from year to year and consisted of very dilute mixtures of various pesticides and water. The pesticides were predominately carbamates and organochlorines and various solvents. Our last shipment of pesticide rinse water from the tank was removed by Chemical Waste Management, Inc. of Kettleman. City, CA on April 11, 1986. Since that date the tank has been left unused and we are proposing to close the tank in place. Enclosed please find a diagram of the location of the tank and the location of the building which is situated above the underground tank. Following soil boring and sampling beneath the tank and labora- tory analysis of the soil and we propose to fill the tank with an inert substance such as sand or cement.