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QUARTERLY GROUNDWATER MONITORING REPORT <br /> THIRD QUARTER 1995 <br /> ' QUIK STOP MARKET NO. 132 <br /> 3555 WEST HAMMER LANE <br /> ' STOCKTON, CALIFORNIA <br /> ' 1 .0 INTRODUCTION <br /> Smith Environmental Technologies Corporation is pleased to present this report of the <br /> results of the third quarter 1995 groundwater monitoring conducted at the subject site <br /> ' in Stockton, San Joaquin County, California (Figure 1 ). The site plan (Figure 2) shows <br /> the location of the station building, adjacent streets, Monitoring Wells, and other site- <br /> specific features. Background information on the site was included in Appendix A of <br /> the quarterly groundwater monitoring report for September 1993 (RESNA, December <br /> ,1993). <br /> The monitoring wells are sampled quarterly to monitor two shallow groundwater <br /> 4� aquifers underlying the site. The program objectives are listed below: <br /> ' • Measure depth of groundwater. <br /> • Sample and analyze groundwater samples for selected petroleum <br /> hydrocarbon 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 <br /> a site is evaluated by (1) the presence of the free-floating product and (2) laboratory <br /> analyses of groundwater samples to evaluate concentrations of total petroleum <br /> hydrocarbons as gasoline (TPH-G), and for benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX). <br /> • <br /> M'AWA94-27313-q[r.,pi Mov 7.961 SWTH <br />