ARCHIVED REPORTS XR0001538 - Laserfiche WebLink

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Wnght EnmronmNM SenAces,Inc 1.0 Background Wright Environmental Services, Inc (Wright) has prepared this Additional Site Assessment and Proposed Monitoring Well Location Placement report on behalf of Estate of Joe Gardella (owner) for the above referenced site The proposed work is in response to a letter dated January 27, 2003 and addendum from the San Joaquin County Environmental Health Department (SJC EHD) for additional monitoring well installations This work is being done to address petroleum contaminants on-site Previous site assessment activities have mapped portions of the dissolved plume and quarterly groundwater monitonng sampling with reports, are ongoing at the site The addendum was discussed in the meeting between Wright and SJC EHD representatives on May 22, 2003, work plan of June 20, 2003 2.0 Cone Penetration Testing and Discrete Groundwater Sampling and Analysis On September 23, 24, and 25 Wright performed exploratory drilling at off-site locations to evaluate the stratigraphy and potential impact to permeable groundwater-beanng strata Gregg Drilling and Testing, Inc (Gregg), a state licensed drilling contractor (C-57 #656407), advanced three CPT bonngs (CPT-03, CPT-04 and CPT-05), and collected discrete groundwater samples at selected intervals The boring locations are shown on Figure 1 Gregg's Presentation of Cone Penetration Test Data dated October 1, 2003, is included as Appendix B Borings CPT-01, CPT-1A and CPT-02 had been previously advanced at on-site and off-site locations (see References, Ramage Environmental reports) Gregg discretely sampled the groundwater at selected depth intervals using a HydropunchTM The Hydropunch was deployed and checked for leakage, prior to exposing the sampling screen to collect samples (see attached Gregg report and geologic cross sections) Borings CPT-03, CPT-04 and CPT-05 were advanced to a total depth of approximately 120- 124 feet below grade with the CPT system, which records tip resistance, sleeve friction, and dynamic pore pressure at five-centimeter intervals Pore pressure dissipation for estimated depth to groundwater tests were recorded when suspected groundwater-beanng zones were encountered during drilling to estimate hydraulic head in the water bearing zones The CPT plots, pore pressure dissipation plots, and interpretation output are included in Gregg's report (Appendix B) The borings collected discrete groundwater samples at selected depth intervals approximately 55-60, 72-75, 115-120 feet below ground surface Upon completion of the drilling and sampling work Gregg seated the borehotes with bentonite-cement grout, placed with a grout collar or tremie pipe under the observation of SJC EHD representative The groundwater samples were collected with a decontaminated stainless steel bailer into laboratory-supplied containers, which were transported in an iced cooler with chain-of-custody documentation to Kiff Analytical, LLC Total Petroleum Hydrocarbons as Gasoline (TPHG), Benzene (B), Toluene (T), Ethyl benzene (E), Xylene (X), Methyl-tent-butyl-ether (MTBE), and fuel oxygenates tert-Amyl-Methyl-Ether (TAME), Ethyl-tert-Butyl-Ether (ETBE), DI-Isopropyl Ether (DIPE) and tert-Butyl Alcohol (TBA) and 1,2-Dichlorethane (1,2-DCA) The data are presented in Table 1 below and the laboratory reports are attached Stefano's—CPT Report Page 3 of 11