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QUARTERLY GROUNDWATER MONITORING REPORT <br /> THIRD QUARTER 1996 <br /> QUIK STOP MARKET NO. 132 <br /> 3555 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> ' 1. INTRODUCTION <br /> Smith Technology Corporation is pleased to present this report of the results of the <br /> third quarter 1996 groundwater monitoring conducted at the subject site in Stockton, <br /> San Joaquin County, California (Figure 1). The site plan (Figure 2) shows the location <br /> of the station building, adjacent streets, Monitoring Wells, and other site-specific <br /> 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 /> • 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 <br /> area boundaries <br /> • Compare current and past data <br /> I <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 /> MVtW 124 2731QVIK 132 RPT 123 Apr 961 <br /> �i <br />