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GeaCa rcuC?' '_2nC Page 3 srte�harac tee�zat[on Report Valentine(Castle Motors) Project No 723 2 November 34 2001 ' smearing prevented water from entering the sampler The SimulProbe" Tool procedures were completed as follows SimulProbe Operation The SimulProbe Maxi Tool construction reflects that of a Split Spoon sampler with modification to allow for its specialized sample collection methods Prior to lowering the tool into the borehole a rubber sleeve is rolled over the SimulProbe to prevent groundwater ' and/or soil from the borehole walls entering the sampler When the sampler is driven the rubber sleeve tears away allowing soil to enter the sampler Three, six inch long by three- inch diameter stainless steel sleeves contained inside the SirnulProbe is filled with the soil ' as the tool is driven These sleeves are removed from the tool and one is taken out, the ends are covered with Teflon sheets and plastic caps are then placed over the ends This sample is then placed on ice for shipment to the laboratory The soil in the other two sleeves is used ' for geologic evaluation After the SimulProbe sampling tool is advanced into the saturated zone the tool is retracted to expose the screen The sample collection chamber is allowed to fill under ambient hydrostatic pressure Once full the chamber is sealed with a pneumatically actuated (N2 gas) solenoid valve the apparatus is brought to the surface The effort to obtain a groundwater sample using the tool was unsuccessful ' Details on the geology encountered during the completion of the soil sampling as well as the field observations are included in Section 3 2, Geology and Field Observations 2.12 Laboratory Analyses Three soil samples from borehole MW-201 were submitted to Sherwood Laboratories of ' Hilmar, California (State Certified Laboratory #1400) for the following analysis • benzene, toluene, ethylbenzene and xylene (BTEX) by EPA inethod 8020 • gasoline-range petroleum hydrocarbons (TPH-G) by EPA method 8015(m) ' • methyl tertiary butyl ether (MTBE) by EPA method 8020 ' Sherwood Laboiatories forwarded two of the samples to EnTech Labs Inc of Santa Clara California (State Certified Laboratory #2346) for the following analysis • oxygenated fuel compounds (MTBE, DIPS, ETBE, TAME and TBA) by EPA method ' 8260 A chain of custody was completed for all samples submitted and tracked to ensure sample ' integrity 2.2 Monitoring Well Installation To investigate the vertical extent of gasoline-range petroleum hydrocarbons in the groundwater at this site, GTI installed one groundwater monitoring well, MW-201, to the southwest of the farmer pump island location (Figure 2, Site Map) ' The monitoring well was constructed using 2-inch diameter PVC casing with flush threads A prefabricated screened interval was used and the table below shows the construction details