Laserfiche WebLink
t <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> FIRST QUARTER 2006 <br /> QUIK STOP MARKET NO. 132 <br /> 3555 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> lA INTRODUCTION <br /> ATC Associates Inc. (ATC) is pleased to present this report for the First Quarter 2006 groundwater <br /> monitoring condur*Pd.at the subject site in Stockton, San Joaquin County, Cali-Fomia (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. 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 /> 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-ter -butyl ether (ETBE), and benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX). <br /> 2.0 GROUNDWATER SAMPLING <br /> On March 13, 2006, in accordance with ATC's field protocols (Appendix A), groundwater samples were <br /> collected from on-site groundwater monitoring wells MW-111, MW-2, MW-4, and MW-5 and off-site <br /> wells MW-9 and MW-10. Groundwater purged from the wells and equipment decontamination water <br /> was placed in Department of Transportation (DOT) approved 17H drums and stored on site pending <br /> analytical results and disposal by licensed waste hauler. The volume of groundwater removed from the <br /> wells and other measured sampling parameters are noted on the field sampling logs included in Appendix <br /> B. <br /> i <br /> s <br /> Quarterly GW Monitoring Report---Ist Qtr 2006 <br /> OhTc <br /> Quik Stop No. 132 <br /> Quik Stop Markets,Inc. <br /> ATC Project No,75.62503.3206 <br /> June 1,2006 <br /> Page 1 of 4 <br />