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Cr 4togual Tecluucs 14c. Page 3 Pre-Bench Test Rpt George's Service Project No 425 2 ' March 10,2005 Groundwater Samples: ' Three groundwater samples were collected on 12/27/04 with the decontaminated stainless steel bailer at the time of drilling (with Geoprobe) from 18 feet to 22 feet, 28 feet to 30 feet and 35 feet to 40 feet below ground surface The samples were shipped to Excelchem ' Environmental Lab (Certification No 2119) for CAM-17 metals, Hexavalent Chromium and general minerals The summary of lab results is tabulated in Table 1 ' A groundwater sample was been collected on February 08, 2005 from each of two monitoring wells, MW-1 and MW-101, and was analyzed for CAM-17 metals The wells were purged with Waterra® pump before sample collection Four and a half gallons of water were purged until the constant values of pH and temperature reached The summary of lab results is tabulated in Table la MW-1 and MW-101 were chosen because of their proxinuty to the BSS-1 location (within 10 feet) and screen intervals 5 feet to 20 feet and 32 5 feet to 35 feet ' below ground surface respectively Soil Samples: ' Four soil samples were collected by direct push Geoprobe drilling method The samples are from 10 feet to 12 feet, 20 feet to 22 feet, 28 feet to 30 feet and 33 feet to 35 feet below ground surface The soil samples were shipped to Excelchem Environmental labs for CAM- 17 metals, hexavalent chromium and general minerals The summary of lab results is tabulated in Table 2 ' All the soil samples were collected with special care to avoid any type of cross contamination Sampling technician wore disposable gloves and changed the gloves between ' different samples All the samples were placed in an ice cooled refrigerator below 4 degree C immediately after collection, and the refrigerated samples were shipped to the lab The lab results are appended in Appendix B ' Four samples from Bench Scale Sampling (BSS-2) borings were sent to Sierra Testing Laboratories Inc of El Dorado Hills CA for hydraulic conductivity testing useful for pilot ' scale chemical oxidation system design These samples were collected from 18 feet, 20 feet, 28 feet and 30 feet below the ground surface GTI will include the discussions and results of Hydraulic conductivity testing in the Pilot Test Plan 4.0 SOIL BORING ABANDONING ' Two soils boring were advanced with Geoprobe to collect water and soil samples The total depth of both soil borings was 35 feet below ground surface Both of the soil borings were ' abandoned properly with the following procedure • Each boring was pressure grouted with a neat cement grout (Type VU Portland with 4% bentonite) and then was capped with concrete to match the surface surrounding the hole • Gregg drilling personnel cleaned the areas with a power washer 1