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I QUARTERLY MONITORING REPORT AUGUST 1996 CANEPA'S CAR WASH 6230 Pacific Avenue Stockton CA September 11 1996 ' EPA Method 602, and for methyl tertiary butyl ether (MTBE) by EPA Method 602 If MTBE was detected In a sample using EPA Method 602, the result was confirmed using EPA Method 8260 The laboratory certificates of analyses and chain-of-custody are located in Appendix C 4 2 Results of Analyses ' TPH-G was detected 1n the groundwater samples from MW-1 at 14 mg/L, MW-2 at 71 mg/L, MW-6 at 0 18 mg/L, and SV-7 at 360 mg/L BTEX constituents were detected in groundwater ' samples from MW-1, MW-2, MW-6, MW-7, and SV-7 ranging from 0 9 pg/l, to 91,000 µg/l, MTBE was detected in groundwater samples from MW-1 at 480 µg/L, MW-3 at 18 µg/L, and SV-7 at 7,800 pg/L TPH-G was not detected at or above the reported laboratory detection limit 1n the groundwater samples collected from MW-3, MW-4, MW-5, MW-7, or MW-8 BTEX constituents were not detected at or above the reported laboratory detection limits In groundwater samples collected from MW-3, MW-4, MW-5, or MW-8 MTBE was not detected at or above the laboratory reported detection limit in groundwater samples collected from MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, or MW-8 The laboratory results are presented in Table 1, below, and Figure 2, Appendix A TABLE 1 Groundwater Analytical Results (August, 1996) MW-1 through, MW-8, SV-7 B T E X nal BE TPH-G MONITOR Detection Limits 03 03 03 06 1 0 005 ' WELL/SAMPLE DATE Sample I D µgel µall µg/l µall µgel mg/l IFMW-1 8/!/96 1707AYM11-811196 4400 2400 280 1200 480 14 MW-2 8/1/96 1707-MW2-8/]/96 18 000 5,000 820 2 900 ND 50* 71 MW-3 8/1/96 1707-NRN'3-811196 ND ND ND ND 18 ND MW-4 811/96 1707-MW4-8!1196 ND ND ND ND ND ND NNl'-5 811196 1707-NfW5-8/l/96 ND ND ND ND ND ND IMW-6 811196 1707-MW6-8/1196 38 09 62 1 0 ND 018 MW-7 811196 1707-MW7-8/1/96 ND ND 30 ND ND ND IMW-8 811196 1707-MW8-8/1196 ND ND ND ND ND ND SV-7 $/1/96 1707-SV7-8/1196 _ 91 000 75 000 3 000 18 000 7,800 360 IUnit Conversions Analvtical µall parts per bil€ion (ppb) B,T E,X = benzene toluene ethyl benzene, and xvlene mgt!parts per million(ppm) TPH-G =total petroleum hydrocarbons quantified as gasoline MTBE =methyl tertiary butyl ether ND=none detected at or above reported lahoratory detection limn ND X=none detected to a le4eI of X " =detection limits raised due to gasoline background Page -3- L� CONDOR