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Quarterly Monitoring Report July 1999 Canepa s Car Wash(Pacific Avenue) August 20, 1999 6 page -4 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-7, and MW-8 BTEX constituents were detected in the groundwater samples collected from MW-1 and MW-2 at concentrations ranging from 84 to 84,000 µg11 Toluene was detected in the groundwater samples collected from monitor wells MW-4 and MW-6 at concentrations of 1 9 and 0 6 µg11, respectively 1PH- G was detected in the groundwater samples collected from MW-1 and MW-2 at concentrations of 8 8 and 180 milligrams per liter (ing/1), respectively A summary of the laboratory 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 Table A, Appendix B TABLE 2 LABORATORY ANALYTICAL RESULTS (JULY 1999) I16 T EXTTPH- Detection G MTBE Other Oxygenates*limits 03 0 3 03 06 005 3 0 See Labot-atory Monitor Well I D µg/l µg11 µg/l µg11 ing/I µg11 Report Sheets 1707-MW1-7127/99 2,600 1 300 84 600 8 8 3,800 ND1 1707-MW2-7127/99 84,000 11,000 2,900 14,000 180 130 NDt 1707-MW3-7/27199 ND ND ND ND ND 86 ND 1707-MW4-7/26/99 ND 19 ND ND ND ND ND F1707-MW5-7/]26/99 ND ND ND ND ND ND ND 7-MW6-7199 ND 06 NDND ND ND ND 7-MW7-7/27/99 ND ND ND ND ND ND ND 1707-MW8-7/27/99 ND ND ND ND ND ND ND Unit Convcrsionc Analytical µg11 p irts per b1111011(ppb) B T F A=benzene,toluene ethyl benzene,and xylene mg/1 parts per million(ppm) TPH-(j=total petroleum hydrocarbons,quantified as gasoline MTBE=Methyl tertiary Butyl Ether *Other Oxygen-Ars/Additives=ethanol Di-isoprop)I ether Ethyl tertiary- Buryl Ether,tertiary-1nnyl Meth)I Ether and tertiarv-Butanol ND=not detected it or above reported laboratory detection limit $=reported laboratory detection limits raised due to elevated concentrations of 0(iier petroleum h)drocarbons in the sample 5 0 DISCUSSION OF RESULTS The aVLiage depth to groundwater measured during the July 1999 groundwater monitoring event was approximately 33 7 Leet below the rnOnrtor well mc,asurfng points The groundwater elevation ranged from 20 27 to 2 l 28 feet bmsl S1itLe November 1994, the depth to groundwater at the site has ranged _ hom approximately 53 feet to 32 5 feet bgs rhe groundwater elevation contour inap (Figure 3, Appendix A) indicate,, groundwater mounding in the cLntei of the site in tine vicinity o1 MW-I and MW- 2 The tiioundwater mounding effect identified during the July 1990, quarterly groundwater monitoring event is generally consistent with previous monitoring result,, Li CONDOR