ARCHIVED REPORTS_XR0010337 - Laserfiche WebLink

Home Browse Search

. III. PILOT TESTING ACTIVITIES Feasibility testing activities were conducted at the site from May through July 2002 The activities conducted at the facility included the installation of an air sparging (AS) test well, two soil vapor extraction (SVE) test wells, a bioenhancement test, an AS test, a SVE test, and a combination AS/SVE test The pilot testing activities were conducted to assist in determining the hydrologic characteristics of the site and design parameters for a groundwater and soil remediation system A. PILOT TESTING WELL INSTALLATION Three wells were installed in the vicinity of the former tank pit (near wells MW-13/13A/13B) for the SVE/IAS pilot testing and collection of soil samples for chemical analysis and treatability studies The pilot testing wells included a total of three wells One 2-inch diameter SVE well (VE-1) was installed in the vadose zone (screened from 10 to 40 feet bgs) One nested (two 2-inch diameter wells) SVE observation point (VE-2) was installed in the vadose zone (screened from 15 to 25 feet bgs for VE-2B and 30 to 40 feet bgs for VE-2A) One 2-inch diameter air sparging test well (IAS-1) was installed with a 5-foot screened section set approximately 3 feet below the water table An additional boring (SB-14) was installed in an unaffected area of the site near monitoring well MW-2 for collection of treatability samples The Well Permit Application Form and boring logs showing the well completion details and are included in Appendix A Soil samples were collected from well boring VE-1 for BTEX/MTBE and TPH analyses to assess the current soil conditions in the source area The two samples retained for chemical analysis were collected from depths of 20 and 35 feet bgs The samples were sealed in glass bars with Teflon-lined lids and placed on ice in a cooler until shipment, with chain-of-custody document, to McCampbell Analytical, Inc in Pacheco, California The soil sample analytical results showed benzene concentrations which varied from <0 5 mg/kg (20') to 0 63 mg/kg (35'), total BTEX concentrations which varied from 194 6 mg/kg (35') to 527 mg/kg (20'), and TPH(g) concentrations which varied from 1,100 mg/kg (35') to 6,900 mg/kg (20') The MTBE concentrations were all determined to be BDL A copy of the soil analytical report is included in Appendix D Soil samples were collected from well boring IAS-1 at depths of 25 and 40 feet bgs to be analyzed for various geotechnical parameters The 25 foot sample was representative of the vadose zone soils and the 40 foot sample was representative of the saturated zone soils The samples were sealed in glass jars and placed on ice in a cooler until shipment, with chain-of-custody document, to Cooper Testing Laboratory in Mountain View, California III-I