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i <br /> 16 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> FOURTH 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 /> fourth quarter 1996 groundwater monitoring conducted at the subject site in <br /> ' 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. <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 /> 1 <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 /> Mv1W 184 27310UIK 132 RPT 123 Apr 881 S � <br /> 1 <br />