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1 � _ <br /> Quarterly Monitoring Report, July 2000 <br /> Canepa's Car Wash (Pacific Avenue) <br /> Page -6 <br /> TABLE 3 <br /> l LABORATORY ANALYTICAL RESULTS FOR SOIL VAPOR EXTRACTION WELLS <br /> Constituent: B T E X MTBE TPA-G <br /> EPA Method: (602)/ (602)/ (602)/ (602)/ (602N(8260) (5030) <br /> (80218) (8021B) (8021B) (8021B) /(8021B) <br /> Detection Limits: 0.3 0.3 0.3 0.6 1 .0 0.05 <br /> Pg/L Itl;/L I19/L 1tg/L pg/L mg/L <br /> .� SV-1 1 /16/97 417000 17,000 33300 62200 [1 ,4001 120 <br /> 1/15/00 1 , 100 34 120 250 1 ,100v 4. 1 <br /> SV-2 4/23/98 49,000 66,000 37200 17,000 261000* v 270 <br /> !� SV-3 7/18/97 719000 733000 3,900 195000 [35,0001 280 <br /> 10/14/99 9,600 21100 440 13400 14,000♦ 25 <br /> SV-4 7/22/98 717000 473000 12700 92400. 170,000*v 390 <br /> 7/11/00 5601 1101 341 60P 4670001 0.8 <br /> SV-5 10/22/97 55,000 732000 31900 19,000 371000* v 290 <br /> FSV-7 <br /> SV-6 ,00 <br /> 4/21/99 650 273000 2,800 13,000 8,600*v 200 <br /> 8/1/96 912000 759000 35000 18,000 7,800 360 <br /> 10/23/98 90,000 779000 3,300 185000 1,800* v 360 <br /> SV-8 1/21/98 875000 672000 34200 17,000 6,400*v 310 <br /> SV-9 4/2/97 253000 ND 25300 19900 793000 53 <br /> 4/12/00 ND(I50) ND(150) ND(150) ND(300) 9,700 • ND(25) <br /> B,T,E,X = benzene, toluene, ethyl benzene, and xylene. ND = none detected at or above laboratory reported detection limit. <br /> TPH-G = total petroleum hydrocarbons, quantified as gasoline. ND (X) = none detected to a level of X. <br /> MTBE = methyl tertiary butyl ether. * = detection limit raised due to elevated petroleum hydrocarbon result. <br /> NA = nottested for this analyte. <br /> [x1 = EPA Method 602 analysis indicates a concentration of x; result is not confirmed by EPA Method 8260, however. Future analysis by EPA <br /> Method 8260 may indicate that MTBE is not present <br /> - v =other oxygenates/additives were analyzed by EPA Method 8260 and were not detected at or above the laboratory reported detection limits. <br /> • = as of the fourth quarter 1999, MTBE was analyzed by EPA Method 602; groundwater monitoring for gasoline oxygenates/additives other <br /> than MTBE was discontinued. <br /> 1 = as of the third quarter 2000, MTBE and BTEX were analyzed by EPA Method 9021B <br /> 5.2.3 DISCUSSION OF OTHER ANALYTES CONCENTRATIONS <br /> Concentrations of toluene, ethyl benzene, total xylenes, and TPH-G in MW- 1 have decreased over time, <br /> while concentrations of toluene have decreased for MW-2. Concentrations of ethyl benzene, total <br /> xylenes, and TPH-G have shown slight increases in monitor well MW-2. Therefore these increased <br /> concentrations with higher groundwater elevations indicate groundwater contact with an additive source. <br /> As the wells are drowned, we are not sampling the first water in contact with this additive source. <br /> n <br /> L ♦ CONDOR <br />