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QUARTERLY GROUNDWATER MONITORING REPORT <br /> SECOND QUARTER 2003 <br /> ' QUIK STOP MARKET NO. 932 <br /> 3j"39�� 355SWEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> ' 1,0 INTRODUCTION <br /> ATC Associates Inc. (ATC) is pleased to present this report of the results of the Second Quarter 2003 <br /> groundwater monitoring conducted at the subject site in Stockton, San Joaquin County, California <br /> (Figure 1). The site pian (Figure 2) shows the location of the station building, adjacent streets, <br /> 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 scope of work is as follows: <br /> r • 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 /> i <br /> 2.0 GROUNDWATER SAMPLING <br /> ' On March 6, 2003, in accordance with ATC's Field Protocol (Appendix A), groundwater samples were <br /> collected from on-site groundwater monitoring wells MWAR, MW-2, MWA, 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 drums. The contents of the drums were transported by a licensed hauler for disposal at a <br /> licensed waste treatment site. The volume of groundwater removed from the wells and other measured <br /> sampling parameters are noted on the water sampling logs included in Appendix B. <br /> 3.0 LABORATORY ANALYSIS <br /> The groundwater samples were transported to STL Chromalab Analytical Labs, Inc., a state-certified <br /> ' laboratory, located in Pleasanton, California. The groundwater samples were analyzed for the presence <br /> of total petroleum hydrocarbon compounds in the gasoline range (TPH-G), benzene, toluene, ethyl <br /> benzene, and total xylenes (BTEX), five fuel oxygenates, 1,2-Dichloroethane (1,2-DCA) and ethylene <br /> dibromide (EDB) in accordance with USEPA Method 8260B. Copies of the laboratory analytical report <br /> and chain-of-custody record are provided in Appendix C. <br /> Quarterly GW Monitoring Report-2°d Qtr 2003 <br /> Quik Stop No. 132 <br /> v Quik Stop Markets, Inc. <br /> J 7ROJECTS411IK STOP 1JKT=S t321Reparts@00312M 012613Rp1 ATC Project No.75.62503.3204 <br /> October 30,2003 <br /> Page 1 of 3 <br />