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I <br /> 1 <br /> QUARTERLY GROUNDWATER MONITORING REPORT 6 <br /> SECOND QUARTER 1996 <br /> QUIK STOP MARKET NO. 132 <br /> 3555 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> 1. INTRODUCTION <br /> Smith Environmental Technologies Corporation is pleased to present this report of the <br /> ■ results of the second quarter 1996 groundwater monitoring conducted at the subject <br /> site in Stockton, San Joaquin County, California (Figure 1 ) The site plan (Figure 2) <br /> I shows the location of the station building, adjacent streets, Monitoring Wells, and <br /> 1 <br /> other site-specific features <br /> The monitoring wells are sampled quarterly to monitor two shallow groundwater <br /> aquifers underlying the site The program objectives are listed below <br /> 0 Measure depth of groundwater <br /> 0 Sample and analyze groundwater samples for selected petroleum <br /> hydrocarbon constituents <br /> • Construct groundwater elevation contour maps within the study <br /> area boundaries <br /> • Compare current and past data <br /> The existence and degree of petroleum hydrocarbons in the groundwater underlying a <br /> 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) Also in compliance with the request of the California Regional Water <br /> Quality Control Board (State of California, May 2, 1995) we are including reporting of <br /> methyl-tert-butyl ether (MTBE) (a non metallic antiknock and oxygenating compound <br /> used in gasoline) <br /> • <br /> 611AW 194 273111UIK 132 RPT 123 Apr 86� s H <br />