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I QUARTERLY MONITORING REPORT JANUARY 1997 CANEPA S CAR WASH . 6230 Pacific Avenue Stockton CA Januvy 27 1997 ' August, 1996, monitoring event Because of this August, 1996, background data, the presence of MTBE in groundwater samples collected during this monitoring event was not confirmed using EPA Method 8260 The laboratory certificates of analyses and chain-ot-custody are located in Appendix C 4 2 Results of Analyses ' Gasoline was detected in the groundwater samples from MW-1 at 6 5 mg/L, MW-2 at 16 mg/L, and SV-1 at 120 mg/L BTEX constituents were detected in groundwater samples from MW-1, I MW-2, MW-7 and SV-1 ranging from 3 6 pg/L to 41,000 µg/L MTBE was detected in groundwater samples from MW-i at 110 µg/L, MW-2 at 60 pg/L, MW-3 at 12 µg/L, and SV-1 at 1,400 µg/L TPH-G was not detected at or above the reported laboratory detection limit in the groundwater samples collected from MW-3, MW-4, MW-5, MW-6 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, MW-6, and MW-8 MTBE was not detected at or above the laboratory reported detection limit in groundwater samples collected from 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 ITABLE 1 Groundwater Analytical Results (January, 1997) MW-1 through MW-8, SV-1 B T E X NNE TPH-G MONITOR Detection 03 03 03 06 1 0 005 WELL/SAMPLE DATE Limits µg/1 µg11 µg/1 µg11 µ811 mg/1 Sample i D MW-1 1/16/97 1707-MWI-1/16/97 2200 1500 260 870 110 65 MW-2 1/16/97 1707-MW2-1/16/97 6 300 1200 ND 300* ND 600* 60 16 MW-3 1/15/97 1707-MW3-l/la/97 ND ND ND ND 12 ND MW4 1/15/97 1707-MW4-1115/97 ND ND ND ND ND ND MW-5 1/15/97 1707-MWS-1/15197 ND ND ND ND ND ND MW-6 1/16/97 1707-MW6-1/16/97 ND ND ND ND ND ND MW-7 1/16/97 1707-MW7-1/16/97 ND ND 36 ND ND ND MW-8 1115/97 1707-MW8-1/15/97 ND Ni) ND ND ND ND SV-1 1/16197 1 707-5V i-];16197 41 00U 1 700 3 300 6200 1 400 120 Unit Conversions Analvtical PgA parts per billion (ppb) B T EA =benzene toluene ethyl benzene and xylene mg/l parts per million(ppm) TPH-G =total petroleum hydrocarbons quantified as gasoline NITBE =methyl tertiary butyl ether ND=none detected at or above reported laboratory detection limit * =none detected to a level of X Detection limit raised due to elevated petroleum llvdrocarbon • concentrations Page -3- Ne�-w �� CONDOR