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Working to Restore Nature 42501 Albrae Street Fremont,California 94538 Phone:(510)651-1906 FAX:(510)651-8647 March 17, 19921D Project No, 3-49132-31 Lh Lt San Joaquin County MAR 18 1992 Public Health Services Environmental Health Division ENVIRONMENTAL HEALTH P.O. Box 2009 PERMITlSERVICES Stockton, CA 95701 Attention: Mr. Steven K. Schneider Environmental Health Specialist Subject: Environmental Investigation (Phase 4), Quik Stop Market No. 132 3555 W. Hammer Lane, Stockton, California Dear Mr. Schneider: As we discussed by phone on Thursday, February 27, 1992, RESNA Industries Inc. (RESNA) and Quik Stop Markets, Inc. (Quik Stop) would lake to proceed with the investigation at the Quik Stop Market located at 3555 W. Hammer Lane, Stockton,California (Figure 1). You are aware of the problems we have been having obtianing permission to enter the adjacent Taco Bell property. From recent discussions we have had with Taco Bell representatives, it appears that permission to enter their property will not be granted. We would,therefore, like to proceed with a downgradient investigation around the Taco Bell site. Information obtained from previous investigations indicate the presence of a perched aquifer on the east side of the site. Quarterly groundwater monitoring has revealed that total petroleum hydrocarbons as gasoline (TPHG)and benzene, toluene, ethyl benzene and total xylenes (BTEX) have not been detected in groundwater samples from the local upper aquifer. Anlaysis of groundwater samples obtained from the perched aquifer has revealed the presence of TPHG and BTEX. Groundwater elevation measurements obtained during this monitoring have indicated that the groundwater flow direction is easterly at a gradient of approximately 0.003. This would indicate that the flow direction would be from the Quik Stop Market site to the Taco Bell site. It should be noted, however,that this gradient and flow direction represent localized conditions in the upper aquifer. Conditions in the perched aquifer may vary, however. We have no information at this time which would indicate a variance. It is the desire of both Quik Stop and RESNA to delineate the extent of the contaminant plume and begin remedial activities. RESNA has received permission to enter the Burger King property on the other side (east) of the Taco Bell property and the City of Stockton has stated they would . approve an encroachment permit for us to work on W. Hammer Lane. It is our intention to conduct a shallow groundwater survey adjacent to the Taco Bell along W. Hammer Lane and the Burger King property to the east, as shown in Figure 2.