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Canepa's Car Wash
<br /> 6230 Pacific Avenue,Stockton,CA
<br /> Fourth Quarter Groundwater Monitoring Report,October 2004
<br /> Page 4 of 6
<br /> • Contaminant concentrations in the sample collected from MW-3 increased relative to the July 2004
<br /> monitoring event, however, contaminant concentrations were less than the January 30, 2004 monitoring
<br /> event with the exception of a notable spike in the concentration of MTBE (Figure 6, Attachment A)
<br /> Contaminant concentrations in the sample collected from monitoring well MW-2 and soil vapor
<br /> extraction well SV-4 are generally consistent with historic results Benzene and MTBE iso-concentration
<br /> contour maps are included as Figures 4 and 5, respectively, Attachment A Laboratory certificates of
<br /> analyses and chain of custody record are included in Attachment E
<br /> Table 3
<br /> Groundwater Sample Laboratory Analytical Results (October 14, 2004)
<br /> Constituent Benzene Toluene Ethyl Total TPH-G MTBE
<br /> Other GasolineBenzene Xylenes
<br /> Oxygenates/Additives
<br /> MCL 1 gg/L 150}ig/L 700 gg1L 1 750 gg/L 13 gg/L
<br /> Analytical Methods 8260E 8260B 8260B 8260B 8015m 8260B 8260B
<br /> Reporting Limits--* 0 5 gg/L 0 5 gg/L 0 5 gg/L t 0 gg/L 005 05 0 5-20
<br /> Sample 1 D rng/L gg/L gg1L
<br /> 1707-MW2-10/14/04 7,900 1,100 2,500 5,500 37 <1 0 < 1 0-<40
<br /> < 10-<40
<br /> 1707-MW3-10/14/04 77 1 7 50 139 0 32* 2,800 140(1,2-DCA), 1 4(TAME)
<br /> 1707-MW4-10/14/04 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5-<20
<br /> 1707-MW9-10/14/04 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5 -<20
<br /> • 1707-MW12D-10/14104 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5 -<20
<br /> 1707-SVE4-10/14/04 67,000 64,000 4,100 20,000 250* 310,000 <500-<20,000
<br /> Bald analytical data exceed California MCL(Maximum Contaminant Level)
<br /> *=the sample chromatogram does not match the standard gasoline chromatogram
<br /> Units Analytical
<br /> mg/L=milligrams per liter—parts per million(ppm) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes
<br /> gg/L=micrograms per liter=parts per billion(ppb) TPH-G=total petroleum hydrocarbons quantified as gasoline
<br /> Gasoline oxygenates/additives= methyl tertiary-butyl ether(MTBE),ethanol,
<br /> tertiary-butanol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether
<br /> (ETRE), tertiary-amyl methyl ether(TAME), 1,2-dcchloroethane (1,2-DCA),
<br /> 1,2-dtbromoethane(1,2-EDB)
<br /> TREATMENT SYSTEM STATUS UPDATE
<br /> Sampling of the Soil Vapor Extraction (SVE) system was suspended during the first quarter of 2004 and
<br /> shut down on January 31, 2004, to allow for modifications to the system and property development In a
<br /> letter dated October 17, 2003, the SJCEHD approved the Remedial Action Plan (RAP) submitted by
<br /> Condor, dated March 3, 2003, for upgrade of the SVE system and installation of a groundwater pump and
<br /> treat system to operate in tandem with the upgraded SVE system Installation of the pump and treat
<br /> system and upgraded SVE system were completed in September 2004
<br /> Initial inspection of the SVE system was conducted on September 30, 2004, and a follow-up inspection
<br /> was conducted on October 7, 2004 In a letter report, Soil Vapor Extraction System, submitted to Karen
<br /> DeGroot of the San Joaquin Valley Air Pollution Control District(SJVAPCD), dated November 30, 2004,
<br /> . Condor provided data required in the SJVAPCD Authority to Construct document to obtain a SJCAPCD
<br /> Permit to Operate Full time operation of the SVE portion of the treatment system was initiated on
<br /> �� CONDOR
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