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Quarterly Monitoring July 2001 and
<br /> Sensitive Receptor Survey Report
<br /> I Canepa's Car Wash(Pacific Avenue)
<br /> Page 7
<br /> TABLE 3
<br /> Groundwater Sample Analytical Results For Soil Vapor Extraction Wells
<br /> B [ E X MTBE
<br /> Constituent (602)/ (602)/ (602)/ (602)1 (602)/(8260)/ (5030)
<br /> EPA Method (5030)
<br /> (802113) (80218) (8021B) (8021 B) (8021B)
<br /> Detection Lunits 03 03 03 06 1 0 005
<br /> µg L lig/L pg/L Pg/L }rg/L mg/L
<br /> Sv-1 1/16/97 41,000 17,000 3,300 6,200 [1,4001 120
<br /> 1115100 1,100 34 120 250 1,100v 41
<br /> SV-2 4/23/98 49,000 66,000 3,200 17,000 26,000*v 270
<br /> SV-3 7/18/97 71 000 73,000 3,900 19,000 [35,0001 280
<br /> 10/14/99 9,600 2,100 440 1400 14,000♦ 25
<br /> SV-4 7/22/98 71,000 1 47,000 1,700 9,400 170,000*v 390
<br /> 7/11/00 560J' 110, 34, 60, 46,000.' 09
<br />' SV-5 10/22/97 55,000 73 000 3,900 19,000 37,000*v 290
<br /> tSV-7
<br /> 4/21199 65,000 27,000 2,800 13,000 8,600*v 200
<br /> 8/l/96 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 3,200 17,000 6,400*v 310
<br /> SVA 4/2/97 25,000 ND 2 300 1 900 79,000 53
<br /> 4112/00 ND(150) ND(l50) 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
<br /> limit
<br /> TPH-G=iotal 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 analysts by EPA
<br /> Method 8260 may indicate that M'l BE 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 tourth quarter 1999, MTBE was analyzed by EPA Method 602,groundwater monitoring for gasoline oxygenates/additives other
<br /> than MTBE was discontinued
<br /> ,=as of the third quarter 2000,MTBE and BTEX were analyzed by EPA Method 8021 B
<br /> 5 2 3 DISCUSSION OF OTHER ANALYTE CONCENTRATIONS
<br /> Concentrations of toluene, ethyl benzene, total xylenes, and TPH-G in groundwater samples collected
<br /> from MW-1 have decreased over time, while only concentrations of toluene have decreased to
<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 /> addieiviwl Soul Ce co,Aamination Because the monito�well screens are drowned, the fir-,t water in contact
<br /> with this additional source of contamination is not being sampled
<br /> 5 2 4 DISCUSSION OF SOIL VAPOR EXTRACTION SYSTEM
<br /> iThe SVE system is designed to operate with an input vapor concentration that is greater than 50% of the
<br /> lower explosive limit (LEL) Between July 10 and 27, 2001 the inlet vapor concentration of the SVE
<br /> system varied from 27 parts per million (ppm)to 55 ppm, which is less than 50% of the LEL The recent
<br /> CONDOR
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