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1 Quarterly Monitoring Report April 1999 ` Canepa s Car Wash(Pacific Avenue) Mai 31 1999 ' Page -4 Laboratory analyses indicated that the selected gasoline oxygenates/additives, excluding MTBE, were not detected, at or above the laboratory reported detection limits in any of the groundwater samples ' MTBE was detected in the groundwater samples collected from monitor wells MW-I MW-2, MW-3, and soil vapor extraction well SVE-6 at concentrations of 680, 71, 16, and 8,600 micrograms per liter (µg/I), respectively BTEX constituents were not detected at or above laboratory reported detection limits in the ' groundwater samples collected from monitor wells MW-3, MW-5, MW-6, MW-7, and MW-8 BTEX constituents were detected in the groundwater samples collected from MW-1, MW-2, and SVE-6 at concentrations ranging from 120 to 65,000 µg/1 Toluene was detected in the groundwater sample ' collected fiorn monitor well MW-4 at a concentration of 3 5 lig/1 TPH-G was detected in the groundwater samples collected from MW-I, MW-2, MW-4, and SVE-6 at concentrations of 5 4, 67, 0 1, and 200 milligrams per liter (ing/1), respectively A summary of the Iaboratory analytical results is ' presented in Table 2, below, and in Figure 2, Appendix A Laboratory report sheets indicating analytical methods used, detection limits, and the results of the analyses are included in Appendix C Historical groundwater analyses are presented in fable A, Appendix B TABLE 2 LABORATORY ANALYSES(APRIL 1999) B T E X TPH-G MTBE Other Oxygenates* Detection limits 03 03 0 3 06 005 1 0 See Laboratory Monitor Well I D µg/1 Ag/1 µg/1 mg/1 Ag/1 Report Sheets 1707-MW1-4/21/99 1,100 620 120 370 54 680 ND ' I707-MW2-4/21/99 2,100 2,700 950 3,700 67 7I ND 1707-MW3-4/21/99 ND ND ND ND ND 16 ND ' 1707-MW4-4/20199 ND 3 5 ND ND 01 ND ND 1707-MW5-4/20/99 ND ND NDFND ND ND ND1707-MW6-4/21/99 ND ND ND ND ND ND 1707-MW7-4121/99 ND ND ND ND ND ND END 1707-MW8-4/20/99 ND ND ND ND ND ND ND 1707-SVE6-4/21/99 65,000 27,000 2,800 13,000 200 8,600 ND Unrt Conversions Anal tical µg/1 parts per billion(ppb) 13 T E a=benzene,toluene eth71 benzene and x)lene mJl parts Der million{ppm) TPl-1-0=total petroleum hti drocarbons quantified as gasoline NITBE=Meths I tertian Butyl Ether *Other 0xvgenates/Additives=ethanol Di-esoprop}I ether,hth}1 tertrar)- But)I Ether krtiar}-aMNI Methyl Ether and tertiary-Butanol ND=not detected at or above reported laboratot3 detection lunit 5 0 DISCUSSION OF RESULTS IThe avcraae depth to groundwater measurc,d during the April 1999 groundwater monitoring events approximately 32 5 fec,t below the monitoi well measuring points The groundwater elevation rangy from 19 07 to 20 12 feet bmsl Since November 1994 the depth to groundwater at the site has range �� CONDOR