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j QUARTERLY GROUNDWATER MONITORING REPORT <br /> SECOND QUARTER 2006 <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 2006 groundwater <br /> monitoring conducted at the subject site in Stockton, San Joaquin County, California(Figure 1). The site <br /> plan (Figure 2) snows the location of the station building, adjacent streets, monitoring wells, and other <br /> site-specific features. Sampling this quarter employed low-flow / low-purge sampling using a peristaltic <br /> pump. <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 /> This quarter ATC re-instituted sampling for TPH-G, BTEX, and five fuel oxygenates as approved in an <br /> updated letter from the San Joaquin County Environmental Health Department received on November 17, <br /> �. 2005. <br /> f <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), the five fuel oxygenates; tert- <br /> Amyl methyl ether (TAME), Methyl Tertiary-Butyl Ether (MtBE), tert-Butanol (TBA), Diisopryopyl <br /> ether (DIPE), and Ethyl-tert-butyl ether (ETBE), and benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX). <br /> 2.0 GROUNDWATER SAMPLING <br /> On June 14, 2006, in accordance with ATC's field protocols (Appendix A), groundwater samples were <br /> collected from on-site groundwater monitoring wells MW-1R, MW-2, MW-4, and MW-5. Due to recent <br /> off-site redevelopment, monitoring wells MW-9 and MW-10 were damaged and can no longer serve as <br /> active monitoring wells. ATC has submitted a workplan for well destruction to San Joaquin County <br /> Environmental Health Department and is currently under review. Groundwater purged from the wells and <br /> equipment decontamination water was placed in Department of Transportation (DOT) approved 17H <br /> drums and stored on site pending analytical results and disposal by licensed waste hauler. The volume of <br /> groundwater removed from the wells and other measured sampling parameters are noted on the field <br /> sampling logs included in Appendix B. <br /> Quarterly GW Monitoring ReporE-2nd Qtr 2006 <br /> Quik Stop No. 132 <br /> VQuik Stop Markets,Inc. <br /> ATC Project No.75.62503.3206 <br /> July°5,2006 <br /> Page l of 4 <br />