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QUARTERLY MON11 ORING REPORT January 1999 CANCPA S CAR WASH 6230 Pacific Avenue,Stock-ton,C.A. 1 ebruary 10 1998 Page -5 TABLE 2 LABORATORY ANALYSES (.Tanuary, 1998) B T E X TPH-G MTBE Other Oxygenates* Detection Inuits 03 03 0 3 06 005 to See Labortary Monitor Well µg/1 µg/1 pg/1 µg/1 mg/l pg/l Report Sheets 1707-MWI-1/21/98 6,800 590 6I0 770 19 570 ND 1707-MW2-1/21/98 5,900 1100 520 1,400 17 ND** ND** 1707-MW3-1/21/98 ND ND ND ND I ND 1 — 137 ND ' 1707-MW4-1/20/98 ND 20 ND ND 0 11 ND ND 1707-MW5-1/20/98 ND ND LND I ND I ND ND ND 1707-10W`6-1/20=98ND ND ND ND ND ND ND 1707-MW7-1/21/98 ND ND ND ND ND ND ND 1707-MW8-1/20/98 ND ND ND ND ND ND ND 1707-SV8-1/21/98 87,000 67,000 3,200 17,000 310 6,400 ND** I esend TYH G =total pvrSeahle pe[roiwm hydrocarbons yuanUfied as gasoline B T E X—benxcne toluene ethyl benzene xylene MTBE =methyl lerttary butyl ether • Other Oxyycnates include ethanol tertiary butanol DIPE=di isopropyl ether ETBE=ethyl tertiary butyl ether I TAMI =ternary amyl methyl ether AID—none detected at or above laboritory detection limn ND**—detection 4mot raised due to elevated roncentranons(See Lahoratory Report Sheets) .5.0 DISCUSSION OF RESULTS The average depth to groundwater was approximately 39 1 feet bgs at the site The groundwater relevation ranged from 26 68 to 25 67 feet below sea level (bmsl) During the past four years, the depth 1 to groundwater at the site has ranged from approximately 53 feet to 39 feet bgs The groundwater elevation contour map (Figure 3, Appendix A) indicates groundwater mounding in the center of the site in the vicinity of MW-I and MW-? This is generally consistent with rnrPcnnijig mnnitnriniv r�cidty The results of the laboratory analyses during the January, 1998, monitoring event indicate that groundwater samples collected from MW-I, MW-2, MW-4, and SV-8 contained TPH-G and BTEX above the laboratory detection limits In addition, MTBE was detected In the groundwater samples collected from MW-1, MW-3, and SV-8 The gasoline oxygenates/additives, exr,ludmg MTBE, were not detected at or above the laboratory reported detection limits in any of the samples analyzed No TPH-G, gasoline oxygenates/additives, or BTEX were detected at or above the laboratory reported detection limits In the groundwater samples collected froin MW-5, MW-6, MW-7 or MW-8 I �� CONDOR