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F CALIFORNIA GEORGE DEUKMEJIAN.Governor <br /> .ALIFORNIA REGIONAL WATEI'UALITY CONTROL BOARD— i =� <br /> 7ENTRAL VALLEY REGION <br /> 'ROUTIER ROAD <br /> h"RAMENTO,CA 95827-3098 <br /> 6 September 1988 <br /> I V <br /> Mr. Charles Nichols <br /> USA Petroleum Corporation �. <br /> P.O. Box 1839 <br /> Santa Monica, CA 90406 <br /> GROUND WATER CONTAMINATION AT USA FUEL STATIONS, SAN JOAQUIN dMffMENTAL HEALTH <br /> i ERM III/SERVICES <br /> Our files indicate that the following USA stations have ground water <br /> contamination: <br /> 1. USA Station #65, 2500 West Lodi Avenue, Lodi <br /> 2. USA Station #110, 2132 East Mariposa Road, Stockton <br /> Reports submitted in October 1987 by your consultant, Applied GeoSystems, <br /> demonstrate that petroleum hydrocarbons have leaked into the environment from <br /> your storage or distribution systems. Our concerns are that the extent of <br /> contamination has not been determined at these sites and the lack of activity by <br /> USA Petroleum to complete the work. Following are our reviews of the reports <br /> and additional investigations necessary at each site: <br /> 1. USA Station #65 <br /> The "Delineation of Hydrocarbon Contamination and Hydrogeoiogic <br /> Characterization" report prepared by Applied GeoSystems (13 October <br /> 1987) with excerpts of a Pacific Environmental Group report, indicates <br /> that contaminated ground water exists beneath the product storage area <br /> and extends south at least 120 feet (MW-3) . The lack of any <br /> additional monitoring wells in the indicated ground water flow <br /> direction (S400E) makes it impossible to determine the actual extent <br /> of contamination at this time. To further define the extent of <br /> contamination, USA Petroleum Corporation is requested to submit a <br /> Preliminary Report by 30 September 1988. Included in the report is to <br /> be a time schedule for completing a Problem Assessment Report by <br /> 30 December 1988, <br /> 2. USA Station #110 <br /> The "Installation of Two Ground Water Monitoring Wells" report <br /> prepared by Applied GeoSystems (7 October 1987) shows ground water <br /> contamination at this site (an excess of two feet of free product in <br /> monitoring well S-2 adjacent to the tanks and sheens in the other two <br /> monitoring wells) . Ground water gradients at the site may be affected <br /> by the number of domestic wells within a 2000-foot radius of the site. <br /> USA Petroleum is to contact the County Health District concerning the <br /> need to monitor domestic wells on a regular basis. Please submit a <br /> Preliminary Report for this facility by 26 September 1988. In the <br /> report include a time schedule for completing a Problem Assessment <br /> Report by 12 December 1988. <br />