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QUARTERLY MONITORING REPORT APRIL 1997 <br /> CANEPA 5 CAR WASH <br /> 248 E Park Street Stockton CA <br /> April 23 1997 <br />' 4 2 Results of Analyses <br /> Gasoline was detected in the groundwater samples from MW-1 at 0 92 mg/L, MW-2 at 20 <br />' mg/L, MW-3 at 0 89 mg/L, MW-5 at 20 mg/L, MW-6 at I 8 Ing/L, and MW-7 at 0 19 mg/L <br /> Gasoline was not detected at or above the laboratory reported detection limits in the sample from MW- <br /> 4 BTEX constituents were detected in groundwater samples from MW-1, MW-2, MW-3, MW-4, <br />' MW-5, MW-6, and MW-7 ranging from 0 3 pg/L to 3,800 µg/L MTBE was detected in groundwater <br /> samples from MW-1 through MW-7 using EPA Method 602 However, EPA Method 8260 was used <br /> to attempt confirmation of MTBE In the sample from MW-2 but did not comfirm its presence This <br />' Indicated that MTBE was not detected in the sample from MW-2 at or above the laboratory reported <br /> detection limit It is possible that MTBE confirmation attempts using EPA 8260 in future monitoring <br /> events wllI indicate that MTBE is also not present in samples from the other wells The laboratory <br />' results are presented in Table 1, below, and Figure 2, Appendix A <br /> TABLE 1 <br />' Groundwater Analytical Results (April, 1997) <br /> y MW-1 through MW-7 <br /> B T E X NITBE TPH-G <br />' MONITOR Detection 03 03 03 06 1 0 005 <br /> WELL/SAMPLE DATE Limits— µg/l ug/l pgA 110 µg/[ mall <br /> Sample I D <br /> MW-1 413197 2038-MW 1-413/97 1 6 5 6 34 3 8 [8 41 092 <br />' MW-2 4/3197 2038-MW2-413197 690 500 580 1400 ND 20 <br /> MW-3 413197 2038-MW3-4/3/97 12 30 35 0 3 [10] 089 <br /> NMI-4 4/3197 2038-MW4-4/3197 03 ND ND ND [1 31 ND <br />' MW-5 413197 2038-MW5-4/3/97 640 3,800 770 1600 [180] 20 <br /> MW-6 413197 2038-MW6413197 ND 15* 280 66 180 [23] 1 8 <br />' MW-7 4/3197 2038-MW7-4/3197 1 06 1 22 ND ND 1481 019 <br /> Unit Conversions Analytical <br />' µg11 parts per billion (ppb) B,T E,X =benzene toluene, ethyl benzene and xvlene <br /> mg/l parts per million(ppm) TPH-G=total petroleum hydrocarbons quantified as gasoline <br /> MTBE =methy[tertiary butyl ether <br /> ND=none detected at or above reported laboraton detection limit <br />' * =none detected to a level of X Detection limit raised due to elevated petroleum hydrocarbon <br /> concentrations <br /> [x]=EPA Method 602 analysts indicates a concentration of a,result is not confirmed by EPA <br /> Method 8260 however Future analysts by EPA Method 8260 may indicate that MTBE is not <br />' present <br /> 1 <br /> Page -3- <br />' t� CONDOR <br />