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f Quarlerly Monitoring Report January 1999 Canepa s Car Wash(Pacific Avenue) February 8, 1999 Page -4 ' µg/1 Toluene was detected in the groundwater sample collected from monitor well MW-4 at a concentration of 1 7 µg/l TPH-G was detected in the groundwater samples collected from MW-1, MW- 2, and MW-3 at concentrations of 12, 110, and 0 08 milligrams per liter(mg/1), respectively A summary of the laboratory analytical results is presented to Table 2, below, and to 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 int. Table A, Appendix B ITABLE 2 LABORATORY ANALYSES (JANUARY 1999) B T E X TPH-G MTBE Other Oxygenates* Detection limits 0 3 03 03 06 005 10 See laboratory Monitor Well I D µg/1 }tg/l µg/1 µg/1 ing/1 µg/l Report Sheets 1707-MW 1-1/2 2/99 5,100 460 470 222 12 300 ND I 1707-MW2-1/22/99 32,000 5,600 1,600 5,500 I10 94 ND 1707-MW3-1/22199 ND ND ND ND 008 10 ND 1707-MW4-1/21/99 ND 17 ND ND ND ND ND 1707-MW5-1/21/99 ND ND ND ND ND ND ND 1707-MW6-1/21/99 ND ND ND ND ND ND ND 1707-MW7-I/22/99 ND ND ND ND ND ND ND I I1707-MW8-1/21/99 ND ND ND I ND ND ND ND Unit Conversions Analytical µg/1 p iris per billion(ppb) B,T E,X=benzene,tofuene,ethyl benzene,and x}levc mg/I parts per million(ppm) rPli-G—total petroleum hydrocarbons quantified as gasoline MTBE=Methyl tertiary Butyl Ether *Other Oxygenates/Additives=ethanol,Di-isopropyl ether,Ethyl tertiary- Butyl Ether tertiary-amyl Methyl Ether and tertiary-Butanol IND=not detected at or above reported laboratory detection limit 5 0 DISCUSSION OF RESULTS T ue average dc,pth to groundwater measured during the .ianuary 1999 groundwater monitoring event was approximately 34 2 feet below the monitor well measuring points The groundwater elevation ranged from 20 63 to 21 67 feet binsl Since November 1994, the depth to groundwater at the site has ranged from approximately 53 feet to 34 feet bgs The groundwater elevation contour map (Figure 3, Appendix A) indicates groundwater mounding in the center of the site in the vicinity ofMW-1 and MW-2 This is ceiterally consistent with previous mouttoring results I'he fiist quarter, 1999, laboratory analytical results are consistent with recent historical laboratory analytical results The laboratory analytical results indicate that the selected gasoline Ioxygenates/additives, excluding MTBE, were not detected at or above the laboratory reported defiftorl linins in any of the groundwater samples BTEX, TPH-G, and M1'BE were detected in the groundw I �� CONDOR