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' QUARTERLY GROUNDWATER MONITORING REPORT <br /> SECOND QUARTER 2004 <br /> ' QUIK STOP MARKET NO. 132 <br /> 3555 WEST HAMMER LANE <br /> ' STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc. (ATC) is pleased to present this report for the Second Quarter 2004 groundwater <br /> monitoring conducted at the subject site in Stockton, San Joaquin County, California(Figure 1). The site <br /> plan (Figure 2) shows the location of the station building, adjacent streets, monitoring wells, and other <br /> site-specific features. <br /> ' The monitoring wells have been sampled quarterly to monitor two shallow groundwater aquifers <br /> underlying the site. The program scope of work is as follows: <br /> • Measure depth to groundwater in site wells; <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 groundwater underlying the site is evaluated by <br /> (1)the presence of free-floating product and (2) laboratory analysis of groundwater samples analyzed for <br /> ' total petroleum hydrocarbon compounds in the gasoline range (TPH-g), and benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX). Included with this report and in compliance with the March 24, <br /> 2004 request of the San Joaquin County Environmental Health Department, are results of analyses for the <br /> ' fuel oxygenates methyl-tert-butyl ether (MTBE) (a non-metallic antiknock and oxygenating compound <br /> used in gasoline), di-isopropyl ether (DIPE), ethyl-tert-butyl ether (ETBE), tert-amyl methyl ether <br /> (TAME) and tert-butanol (TBA) by United States Environmental Protection Agency (USEPA) Method <br /> ' 8260B for samples collected from selected groundwater monitoring wells. <br /> 2.0 GROUNDWATER SAMPLING <br /> ' On June 17, 2004, in accordance with ATC's Field Protocol (Appendix A), groundwater samples were <br /> collected from on-site groundwater monitoring wells MW-1R, MW-2, MW-3, MW-4, MW-5, and off- <br /> site groundwater monitoring wells MW-6, MW-7, MW-8, MW-9 and MW-10. Groundwater purged <br /> ' from the wells and equipment decontamination water was placed in Department of Transportation(DOT) <br /> approved 17H drums. The contents of the drums were transported by a licensed waste hauler for disposal <br /> at a licensed waste treatment facility. The volume of groundwater removed from the wells and other <br /> ' measured sampling parameters are noted on the water sampling logs included in Appendix B. <br /> ' Quarterly GW Monitoring Report-2" Qtr2004 <br /> y Quik Stop No. 132 <br /> Quik Stop Markets, Inc. <br /> ATC Project No,75.62503.3205 <br /> August 12,2004 <br /> Page 1 of 3 <br />