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1 <br />' Quarterly Monitoring Report April 2001 <br /> Canepa's Car Wash(Pacitic Avenue) <br />' TABLE 3 <br /> GROUNDWATER SAMPLE ANALYTICAL RESULTS FOR SOIL VAPOR <br /> EXTRACTION WELLS <br />' B T E r <br /> CuntitttuetntMTBE TPH-G <br /> (602)/ (602)/ (602)/ (602)1 (602)/(8260)/(8021B <br /> CPA Method <br /> (8021 B) (80218) (8021 B) (802113) ) (5030) <br /> Detectwn Limits t)3 0 3 03 06 1 0 005 <br /> )ig/L µg/L µg/L Fig/L µg/L mg/L <br /> 5V-1 1/16/97 41 000 17 000 3 300 6200 [1 400] 120 <br /> 1/15/00 1 100 34 120 250 1 100 v 4 1 <br /> SV-2 4/23198 49 000 66 000 3200 17,000 26 000*v 270 <br /> SV-3 7118197 71 000 73 000 3 900 19 000 [35 0001 280 <br /> 10/14/99 9 600 2 100 440 1 400 14 000♦ 25 <br /> IW-4 7/22/98 71 000 47 000 1 700 9400 170,000*v 390 <br /> 7/11/00 5601 1101 341 601' 46 000: 0 8 <br /> sV-5 10/22/97 55,000 73 000 3,900 19,000 37 000*v 290 <br /> 5V-6 4/21/99 65 000 27 000 2 800 13 000 8,600*v 200 <br /> SV-7 8/1/96 91,000 75 000 3,000 18,000 7 800 360 <br /> 10/23/98 90 000 77 000 3,300 18,000 l 800*v 360 <br /> 5V-8 1/21198 87 000 67 000 3,200 17,000 6,400*v 310 <br /> SV-9 4/2/97 25 000 ND 2 300 1 900 79,000 53 <br /> 4/12100 ND(150) ND(150) ND(150) ND(300) 9700♦ ND(25) <br /> iB,TEX=benzene toluene ethylhenzene ind xylene ND = none detected at or above laboratory reported detection <br /> lit-nit <br /> TPH-G=total petroleum hydrocarbons quantified as gasoline ND(X)�none detected to a level of X <br /> MTBE=methyl tertiary bury]ether *=detection limit raised due to elevated petroleum hydrocarbon result <br /> NA=not tested for this analyte <br /> [xl=EPA Method 602 aiiolysis indicates a concentration of x recuit is not cootirmed by EPA Method 8260 however Future analysis by EPA <br /> Method 8260 may indicate that MTBE is not present <br />' v—other o\ygenatcn/addittves were analyzed by EPA Method 8260 and were not detected at or above the laboratory reported detection limits <br /> * =as of tine IOUrth cluaitei 1999 MTBE war analyzed by EPA Method 602 groundwater monitoring tar gasoline oxygenates/additives other <br /> than MTBE was diticontmued <br /> P=-s o1 the third quarter 2000 MTBE and BTEX were analyzed by EPA Method 8021 B <br /> 523 DISCUSSION OF OTHER ANALYTE CONCENTRATIONS <br /> Concentrations of toluene, etnyl benzene, total xylenes, ano TPH-G lil groundwdier sdiuples wllectau <br /> from MW-1 have decreased over time, while only concentrations of toluene have decreased in <br /> groundwater samples collected from MW-2 Concentrations of ethyl benzene, total xylenes, and TPH-G <br /> have shown increases in groundwater samples collected from monitor well MW-2 Therefore these <br /> increased concentrations with higher groundwater elevations indicate groundwater contact with <br /> • additional source contamination Because the monitor well screens are drowned, the first water in contact <br /> with this additional source of contamination is not being sampled <br /> I �� CONDOR <br />