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<br /> Monitoring Well Installation Report
<br /> 730 E Channel Street,Stockton,CA
<br />'I December 15,2004
<br /> Page 7
<br /> Table 4 The laboratory analytical results of the groundwater samples are presented in Table 5 Copies of
<br /> Ilaboratory analytical results and chain-of-custody records for the samples are included in Appendix D- -
<br /> Table 4 Soil Sample Analytical Results
<br />'
<br /> B T E X TPH-G TEPH Oxygenates Total
<br /> Sample I D- _ Sample Date Lead
<br /> (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg)
<br />' 3849D-M W I-COMP- 9/23/04 <0005 <0005 <0005 <0010 <1 0 <50<20 <0005 -<050 9 0 F
<br /> 9/23/04
<br /> 3849D-MW2-COMP- 9/23/04 <010 <010 <010 <0 20 26 10(D) <0 1 -< 10 99
<br /> 123/04
<br /> 849D-MW3-COMP- 9/24/04 <0005 <0005 <0005 <0010 < 1 0 <50<20 <0005-<050 62
<br /> f /24/04
<br /> Unit Conversions
<br /> mg/kg=milligrams per kilogram(ppm) r
<br /> Analytical
<br /> B,T E X=benzene,toluene ethyl benzene,total xylenes
<br /> TPH-G=total petroleum hydrocarbons,quantified as gasoline
<br /> TEPH=total extractable petroleum hydrocarbons quantified as kerosene(K),diesel(D),and motor oil(MO)
<br /> Oxygenates=methanol,ethanol,tertiary-butanol(TBA),methyl tertiary-butyl ether(MTBE) di-isopropyl ether(DIPE),ethyl tertiary-butyl
<br />' ether(ETBE),tertiary-amyl methyl ether(TAME),1,2-dichloroethane(1,2-DCA),and 1,2-dibromoethane(EDB) ; X6 1 0{t,v
<br /> Table 5 Groundwater Sam le Anal ical Results ;�,'; ° �t` ���$�
<br /> Sample I D Sample Date B T E X TPH-G TEPH Oxygenates
<br /> (µg/L) (pg/L) (pg/L) (n/L) (uglW (µglut (ug/[-)
<br /> 3849E-MW 1-11/8/04 11/8/04 <0 5 <05 <0 5 < 1 0 <50 <50-<250 <05—<50
<br /> 3849E-MW2-11/8/04 1118/04 <0 5 <0 5 <0 5 < 1 0 <50 <50-<250 <0 5—<50
<br /> 3849E-MW3R-11/8/04 11/8104 <05 <05 <05 < 10 <50 <50-<250 <05—<50
<br /> Unit Conversions
<br /> pg/L=micrograms per liter(ppb)
<br /> Analytical
<br /> B,T,E,X=benzene,toluene,ethyl benzene,total xylenes
<br /> TPH-G=total petroleum hydrocarbons quantified as gasoline F
<br /> TEPH=total extractable petroleum hydrocarbons quantified as kerosene(K),diesel(D),and motor oil(MO)
<br /> Oxygenates=methanol,ethanol,tertiary-butanol(TSA),methyl tertiary-butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl tertiary-butyl
<br /> ether(ETBE),tertiary-amyl methyl ether(TAME),1,2-dichloroethane(1,2-DCA),and 1,2-dibromoethane(EDB)
<br /> 7.0 SUMMARY AND RECOMMENDATIONS
<br /> Low concentrations of TPH-G and TEPH-D were detected in the composite soil sample of the drill
<br /> I cuttings from the boring for monitoring well MW-2 No petroleum hydrocarbons were detected at or
<br /> above the laboratory reported detection limits in the composite soil samples collected from the drill
<br /> cutting from the borings for monitoring wells MW-1 and MW-3 Total lead was detected in the composite
<br /> soil samples of the drill cuttings from the borings for monitoring wells MW-1, MW-2, and MW-3 No
<br /> petroleum hydrocarbons were detected at or above the laboratory reported detection limits in the
<br /> groundwater samples collected from monitoring wells MW-1, MW-2, and MW-3R
<br /> Condor recommends conducting quarterly groundwater monitoring at the Site for three additional quarters
<br /> to collect groundwater gradient and laboratory analytical data for one full hydrologic cycle
<br /> 1
<br /> geA CONDOR
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