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Quarterly Monitoring Report July 2000
<br /> Canepa's Car Wash(Pacific Avenue)
<br /> Page -6
<br /> TABLE 3
<br /> LABORATORY ANALYTICAL RESULTS FOR SOIL VAPOR EXTRACTION WELLS
<br /> Constituent B T E X MTBE TPH-G
<br /> EPA Method (602)/ (602)/ (602)/ (602)/ (602)/(8260) (5030)
<br /> (8021B) (8021B) (8021B) (8021B) /(8021B)
<br /> Detection Limits 03 03 03 06 1 0 005
<br /> µ11/L µg/L lig/L- µ€1L µg/L mg/L
<br /> SV-1 1/16/97 41,000 17 000 3,300 6200 11,4001 120
<br /> 1115/00 1,100 34 120 250 1,100v 4 1
<br /> SV-2 4/23/98 49,000 66 000 3,200 17,000 26 000*v 270
<br /> ISV-3 7/18/97 71,000 73 000 3 900 19 000 135,0001 280
<br /> 10/14/99 9,600 2100 440 1,400 14,000♦ 25
<br /> SV-4 7/22/98 71 000 47,000 1 700 9,400 170 000*v 390
<br /> 7/11/00 5601 110.1' 34J' 601 46,0001 08
<br /> SV-5 10/22/97 55,000 73 000 3,900 19,000 37,000*v 290
<br /> SV-6 4/21/99 65,000 27,000 2,800 13 000 8 600*v 200
<br /> SV-7 811196 91 000 75,000 3,000 18 000 7 800 360
<br /> 10/23/98 90,000 77 000 3,300 18,000 1 800*v 360
<br /> SV-8 1/21/98 87,000 67 000 3200 17,000 6,400*v 310
<br /> ISV-9 4/2197 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 /> 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=not tested for this analyte
<br /> [x]—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[units
<br /> + =as of the fourth quarter 1999 MTBE was analyzed by EPA Method 602, groundwater monitoring for gasoline oxygenatesladditives other
<br /> than MTBE was discontinued
<br /> J'=as of the third quarter 2000 MTBE and BTEX were,analyzed by EPA Method 8021B
<br /> 5 2 3 DISCUSSION OF OTHER ANALYTES CONCENTRATIONS
<br /> Concentrations of toluene, ethyl benzene, total xylenes, and TPH-G to 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 /> L� CONDOR
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