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First Quarter 2005 Quarterly Groundwater Monitonng Report
<br /> Raymond Investment Corporation,Stockton,CA
<br /> Page 2
<br /> • hydrocarbon odors were noted in the groundwater inspection samples from MW-1, MW-2, and MW-3R
<br /> Field observations are included on the Groundwater Monitoring Field Forms, attached
<br /> GROUNDWATER ELEVATIONS AND GRADIENT
<br /> The average groundwater elevation in the monitoring wells was -20 19 feet, an increase of approximately
<br /> 0 78 feet since the previous sampling event conducted on November 8, 2004 The estimated groundwater
<br /> gradient for the Site was 0 0053 ft/ft to the northeast and is shown on Figure 3, attached Monitoring well
<br /> T groundwater elevation data are presented in Table 1, below Historic groundwater elevation data are -
<br /> presented in Table A, attached
<br /> Table 1
<br /> Groundwater Elevation Data (February 4, 2005)
<br /> Well I D TOC Screened Depth to Groundwater
<br /> Elevation' Interval b s Groundwater Elevationz
<br /> MW-1 1635 32-47 3645 -20 10
<br /> MW-2 1652 — 32-47 3670 -20 18
<br /> MW-3R 15 78 r 32-47 3607 -2029
<br /> TOC Elevation referenced to NAVEAq.vertical datum %)07 x191,16
<br /> 'Groundwater Elevation Elevations are measured from the top of the well casings and are referenced to the benchmark indicated
<br /> above
<br /> All measurements are to feet
<br /> LABORATORY ANALYTICAL RESULTS
<br /> Groundwater samples collected from the monitoring wells were analyzed for benzene, toluene, ethyl
<br /> benzene, total xylenes (BTEX) and gasoline additives/oxygenates by EPA Method 82608, total
<br /> petroleum hydrocarbons quantified as gasoline (TPH-G) and total extractable petroleum hydrocarbons
<br /> quantified as kerosene (TEPH-K), motor oil (TEPH-MO), and diesel (TEPH-D) by EPA Method 8015B
<br /> Gasoline oxygenates/additives include methanol, ethanol, tertiary-butanol (TBA), methyl tertiary-butyl
<br /> ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether
<br /> (TAME), 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) Groundwater samples were ----
<br /> analyzed by Argon Laboratories, Inc of Ceres, California The current groundwater sample laboratory
<br /> analytical results are presented in Table 2, below Historic groundwater monitoring data are presented in
<br /> Table A, attached
<br /> Table 2
<br /> Groundwater Sample Analytical Results (February 4, 2005)
<br /> Sample I D Sample Date B T E X TPH-G TEPH Oxygenates
<br /> (µg/L) (Iug/L) (µg/L) (ug/L) (uLg/L) (µg/L) (ug/W
<br /> 3849E-M W 1-2/4/05 214105 <0 5 <0 5 <0 5 < 1 0 <50 <50-<250 <05—<50
<br /> 3849E-M W2-2/4/05 214105 <0 5 <05 <0 5 < 10 <50 <50-<250 <0 5—<50
<br /> 3849E-MW3R-2/4105 2/4105 <0 5 <0 5 <0 5 < 1 0 <50 <50-<250 <0 5—<50
<br /> Unit Conversions - r
<br /> µg/L=micrograms per liter=parts per billion(ppb) _
<br /> Analvttcal
<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(WE),ethyl tertiary-butyl ether
<br /> (ETRE),tertiary-amyl methyl ether(TAME), 1,2-dichloroethane(1,2-DCA),and 1,2-dibromoethAne(ED8)
<br /> v
<br /> Ofl
<br /> �st� CONDOR
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