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Fourth Quarter 2005 Quarterly Groundwater Monitoring Report
<br /> Raymond Investment Corporation,Stockton,CA
<br /> Page 2
<br /> G GROUNDWATER ELEVATIONS AND GRADIENT
<br /> The average groundwater elevation in the monitoring wells was -19 18 feet, a decrease of 0 68 feet since
<br /> —the previous sampling event'conducted on August 16, 2005 The estimated groundwater gradient for the
<br /> 3 ri Site was 0 005 ft/ft to the east-northeast and is shown on Figure 3, attached Monitoring well groundwater -
<br /> elevation data are presented in Table 1, below Historic groundwater elevation data are presented in Table
<br /> A, attached
<br /> Table 1
<br /> Groundwater Elevation Data (November 18, 2005)
<br /> n Well I D. TOC Screened Depth to Groundwater
<br /> Elevation' Interval (b s) Groundwater Elevation2
<br /> MW-1 1635 32-47 3544 -1909
<br /> MW-2 1652 32-47 35 69 -19 17
<br /> MW-3R 15 78 32-47 3505 -19 27
<br /> TOC Elevation referenced to NAVDO'vertical datum. '4 y�191ob r
<br /> 'Groundwater Elevation Elevations�ar e measured from the top of the well casings and are referenced to the benchmark indicated
<br /> L above - -
<br /> ' All measurements are m 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 8260B, total
<br /> petroleum hydrocarbons quantified as gasolme (TPH-G) and total extractable petroleum hydrocarbons
<br /> quantified as kerosene (TEPH-K), motor ail (TEPH-MO), and diesel (TEPH-D) by EPA Method 8015M
<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 monitormg data are presented in
<br /> Table A, attached
<br /> Table 2
<br /> Groundwater Sample Analytical Results (November 18, 2005)
<br /> Sample I D Sample Date B T E X TPH-G TEPH Oxygenates
<br /> (µg/L) (µg/L) (lig/-) (kg/L) (gg/L) (lig/L) (pg/L)
<br /> MW-1 11/18/05 <05 <05 <05 < 10 <50 <50-<200 <05—<50
<br /> -MW-2 11/18/05 <05 <05 <05 1 < 10 <50 <50-<200 <05--<50
<br /> MW-3R 11/18/05 <05 <OS <OS < 10 <50 <50-<200 <05—<50
<br /> Unit Conversions lig/L=micrograms per liter=parts per billion(ppb) ~
<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 ether
<br /> (ETRE) tertiary-amyl methyl ether(TAME), 1,2-dichloroethane(1,2-DCA),and 1,2-dibromoethane(EDB)
<br /> s
<br /> �� CONDOR
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