ARCHIVED REPORTS_XR0006639 - Laserfiche WebLink

Home Browse Search

Ms Linda Turkatte October 17, 1994 ' Page 2 removed from the site in December 1989 Harken Marketing Company (HMC) submitted a ' work plan to the Department of Health Services, San Joaquin County, to assess the possible unauthorized discharge of petroleum constituents In January 1991, Associated Soils Analysis (ASA) supervised the drilling of three soil bonngs and the installation of three monitoring wells (MW-1 through MW-3) each to a depth of 25 feet below ground surface (bgs) Petroleum hydrocarbon constituents were identified in the soil and groundwater samples collected from all three monitoring wells In June 1992, Tank Protect Engineering (TPE) supervised the drilling of three soil boring and the installation of three additional monitoring wells (MW-4 through MW-b) each to a depth of 31 5 feet bgs Petroleum hydrocarbon constituents were identified in the soil and groundwater samples collected from monitoring well MW-5 In December 1993, HETI drilled two soil borings and installed an additional two monitoring wells (MW-7 and MW-8) each to a total depth of 29 5 feet bgs Petroleum hydrocarbon constituent were not identified in the soil and groundwater samples collected from monitoring wells MW-7 and MW-8 Depth to groundwater beneath the site is approximately 20 feet bgs, Groundwater generally flows toward the north at a gradient of approximately 0 002 feet/foot Proposed Scope of Work P P E-Z Serve and Brown and Caldwell propose to conduct the following scope of work in accordance with the recommendation listed in the Tri-Regional Board Staff Recommendations for the Preliminary Evaluation and Investigation of Underground Storage Tank Sites, dated ' August 10, 1990 and the State Water Resources Control Board Petroleum Underground Storage Tank Cleanup Fund Corrective Action Guide, dated June 1992. -� Brown and Caldwell proposes to conduct an ASI pilot tests on-site Groundwater monitoring well MW-2 will be used as the SVE test well, and wells MW-8 and MW-5 will be monitored during the SVE test Following the completion of the SVE test, Monitoring Well MW-8 will be used as the AS test well and wells MW-2 and MW-5 will be used to monitor the progress of the combined AS/SVE test The AS/SVE pilot test will be conducted over the period of approximately two days. Permits for conducting the proposed pilot test, will be obtained prior to commencing field work Procedures for conducting an AS/SVE pilot test are included in Attachment A Results of the pilot test will be summarized in a Corrective Action Plan (CAP) The CAP will include a summary of investigations conducted to date, descriptions of`the subsurface geology ' I e NenerveV W878\workplan hplaserlIID I I Grown and Caldwell _ I' Consultants le! E I I _ail u