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3315 Almaden Expressway, suite 34 Working To Restore Nature <br /> San Jose,CA 95118 <br />' Phone (408)264-7723 <br /> FAX (408) 264-2435 <br /> January 27, 1994 <br /> Project No F7120 93 <br /> Mr Michael Karvelot <br /> Director of Environmental Affairs <br /> Quik Stop Markets, Inc <br /> 4567 Enterprise Street <br /> Fremont, California 94538 <br />' Subject Letter Report, Semiannual Groundwater Monitoring, Second Half 1993 <br /> Quik Stop Market No 120 <br /> 9321 North Thornton Road, Stockton, California <br /> Mr Karvelot <br /> RESNA Industries Inc (RESNA), is pleased to present this report of the results of the <br /> semiannual groundwater monitoring for the second half of 1993 conducted at the subject site <br /> in Stockton, San Joaquin County, California (Plate 1) The site plan (Plate 2) shows the <br /> location of the station building, adjacent streets, monitoring wells, and other site-specific <br /> features Background information on the site was included in Appendix A of our <br />' semiannual groundwater monitoring report for June 1993 (RESNA, August 1993) <br /> The monitoring wells are sampled semiannually to monitor the shallow groundwater <br />' underlying the site The program objectives are listed below <br /> • Measure depth of groundwater <br />' • Sample and analyze groundwater samples for specified petroleum <br /> hydrocarbons constituents <br /> • Construct groundwater elevation contour maps within the study area <br />' boundaries <br /> • Compare current and past data <br /> The existence and degree of petroleum hydrocarbons in the groundwater underlying a site <br /> is evaluated by (1) the presence of the free-floating product, and (2) laboratory analyses of <br /> groundwater samples to determine concentrations of total petroleum hydrocarbons as diesel <br />