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r <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> FIRST QUARTER 2002 <br /> QUIK STOP MARKET NO. 132 <br /> r 355 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> 1 <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc. (ATC) is pleased to present this report of the results of the First Quarter <br /> 2002 groundwater monitoring conducted at the subject site in Stockton, San Joaquin County, <br /> California (Figure 1). The site plan (Figure 2) shows the location of the station building, <br /> adjacent streets, monitoring wells, and other site-specific features. <br /> The monitoring wells have been sampled quarterly to monitor two shallow groundwater aquifers <br /> underlying the site. The program objectives are listed below: <br /> • Measure depth of groundwater; <br /> • Analyze groundwater samples for select petroleum hydrocarbon constituents; <br /> • Construct groundwater elevation contour maps within the study area boundaries; and <br /> Compare current and past data. <br /> The existence and degree of petroleum hydrocarbons in the groundwater underlying the site is <br /> evaluated by (1) the presence of the free-floating product and (2) laboratory analyses of <br /> groundwater samples to evaluate concentrations of total petroleum hydrocarbons as gasoline <br /> (TPH-G), and for benzene, toluene, ethylbenzene, and total xylenes (BTEX). Also in compliance <br /> with the request of the California Regional Water Quality Control Board (RWQCB, state of <br /> California, May 2, 1995), we are including reporting of methyl-tert-butyl ether (MTBE) (a non- <br /> metallic antiknock and oxygenating compound used in gasoline). Included with this report, in <br /> compliance with the July 18, 1997 request of the RWQCB-Central Valley Region, are results of <br /> analysis for the fuel oxygenates, di-isopropyl ether (DIPS), ethyl-tert-butyl ether (ETRE), MTBE, <br /> i <br /> tert-amyl methyl ether (TAME), tert-butanol (TBA), and 1,2-dichloroethane (1,2-DCA) by <br /> Quarterly GW Monitoring Report-1st Qtr 2002 <br /> NATC Quik Stop i 3. 132 <br /> ATC Project No. 75.62503.3203 <br /> June 3, 2002 <br /> JAPROJECTSIOUX STOP MKTSIOS 1321Reports1200M1s10tr2002Rpt Page 1 of 6 <br />