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<br /> TABLE BA
<br /> ' Chemical Analyses (Groundwater/Geoprobe)
<br /> B T E X MTBE TPH-G TEPH
<br /> Detection 0.3 0.3 0.3 0.6 1.0 0.05 0.05-0.5
<br /> ' Sample I.D. Limits: µg/I µg/1 µg/1 µg/I µg/1 µg/1 mg/l
<br /> 1432-GPI-8/29/96 ND 0.3 ND ND ND ND ND
<br /> 1432-GP2-8/29/96 0.4 0.6 ND 0.6 ND ND ND
<br /> 1432-GP4-8/29/96 69 600 66 400 1,300 2.7 ND
<br /> 1432-GP5-8/29/96 ND ND ND ND ND ND ND
<br /> Unit Conversions: Analytical
<br /> µg/Lparts per billion(ppb) BTEX=benzene,toluene,ethyl benzene,and xylene.
<br /> mg/I:parts per million(ppm) MIKE=methyl tertiary butyl ether.
<br /> TPH-G=total petroleum hydrocarbons,quantified as gasoline.
<br /> TEPH=total extractable petroleum hydrocarbons,quantified as diesel,motor oil,and kerosene.
<br /> ND=none detected at or above the reported laboratory detection limits.
<br /> Based on the results of the Geoprobe investigation,Condor recommended that monitor wells be installed
<br /> at the site to investigate and monitor the lateral extent of the gasoline and diesel contamination plume
<br /> ' (reference - Soil and Groundwater Investigation Report, prepared by Condor, dated September 30,
<br /> 1996). Mr. Ronald Rowe of the PHS/EHD approved the proposal for the monitor well installation in
<br /> correspondence to Condor, dated February 6, 1997. Condor subsequently prepared the Work Plan for
<br /> ' Monitor Well Installation,dated May 30, 1997. As described in Section 1.0 of this report,the Work Plan
<br /> was approved by the PHS/EHD and the Reclamation District in July, 1997.
<br /> In accordance with the work plan, Condor conducted an additional soil and groundwater investigation on
<br /> September 10, 15, and 18, 1997, at the site. Four monitor wells were drilled, installed, developed,
<br /> surveyed, and sampled as part of the investigation. The Report - Additional Soil and Groundwater
<br /> ' Investigation, dated December 11, 1997,was prepared by Condor describing the investigation results.
<br /> Laboratory analysis of the soil samples indicated that total petroleum hydrocarbons quantified as
<br /> ' kerosene, diesel, and motor oil (TEPH), ethanol, tertiary butanol, DIPE, ETBE and (TAME) were not
<br /> detected at or above the laboratory reported detection limits in any of the samples collected from the
<br /> monitoring wells during the September, 1997, sampling event. BTEX, TPH-G, and MTBE were not
<br /> detected at or above the laboratory reported detection limits in the soil sample collected from MW 1 at a
<br /> t depth of six feet bgs. Benzene, ethyl benzene and xylene were not detected at or above the laboratory
<br /> reported detection limits in the soil sample collected from MW-2 at a depth of four feet bgs. Toluene,
<br /> TPH-G and MTBE were detected in the soil sample collected from MW-2 at a depth of four feet bgs (16
<br /> ' µg/kg, 1.2 mg/kg and 1,300 gg/kg, respectively). Benzene and toluene were not detected at or above the
<br /> raised laboratory reported detection limit in the soil sample collected from MW4 at a depth of six feet
<br /> bgs. MTBE was not detected at or above the laboratory reported detection limit in the sample collected
<br /> ' from MW4 at a depth of six feet. Ethyl benzene, xylene and TPH-G were detected in the soil sample
<br /> collected from MW4 at a depth of six feet (680 gg/kg, 6,000 µ/kg, and 28 mg/kg, respectively).
<br /> Laboratory results of the soil samples are presented in Table B.5,on the next page.
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<br /> ' B-3
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