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1 <br /> page 2, 6131 Pacific Ave. <br /> To continue the investigation at this site, Cambria proposes the installation of one shallow <br /> groundwater monitoring well for definition of the lateral extent of the shallow plume <br /> generally east of the site, and the installation of one deep, discretely screened monitoring <br /> well for definition of the vertical extent of the plume onsite. SJC/EHD approves the <br /> installation of these additional wells, and recommends a maximum screened interval of <br /> five feet in the deep discrete well, placed in an appropriate water bearing zone. SJC/EHD <br /> is approving the proposal as presented in the narrative of the work plan, for the installation <br /> of two additional wells. Please note that the SCM submitted with the work plan states that <br /> three wells, two shallow and one deep, will be installed. <br /> Cambria proposes to conduct a dual-phase extraction (DPE) test as interim remediation <br /> on well VEW-2 and, possibly, a soil vapor extraction (SVE) test on well VEW-1. Details of <br /> how they intend to conduct the tests were not provided in the work plan. Please have <br /> Cambria submit an addendum detailing the DPE and possible SVE test designs. The <br /> addendum is due February 13, 2004. <br /> Cambria submitted a revised quarterly groundwater monitoring and sampling program <br /> proposing that groundwater samples from all site wells, MW-1 thru MW-11 and VEW-2, <br /> will be analyzed quarterly for TPHg, BTEX, MtBE, 1,2-DCA and EDB. The samples will <br /> be analyzed annually, in the third quarter, for all fuel oxygenates. Cambria did not state <br /> by which EPA approved laboratory method these analyses will be performed; SJC/EHD <br /> approves the new sampling protocol with analyses by EPA Method 8260B. <br /> Chromatograms were provided for the analyses of groundwater samples collected during <br /> the first quarter 2003 report concentrations of tetrachloroethane in wells MW-6 thru <br /> MWA 1, which Cambria states is not part of the onsite contaminant plume. Analysis for <br /> quantification of the PCE in all wells was completed in the third quarter of 2003. SJC/EHD <br /> has reviewed the Third Quarter Groundwater Monitoring Report and the submitted <br /> chromatograms and is inclined to agree with Cambria that there are two plumes in the <br /> area monitored. SJC/EHD will discuss this data with the Regional Water Quality Control <br /> Board at our monthly meeting in January. Historically, wells MW-6 and MW-7 have <br /> yielded TPHg and BTEX compounds, which would make wells MW-8 thru MWA 1 <br /> representative of the non-detect line of the onsite plume to the south and southeast. <br /> Please proceed with submittal of access agreements and well permit applications, <br /> including the required $89.00 permit fee per application, for installation of the monitoring <br /> wells. The deadline for installation of the wells is February 27, 2004; a report of findings <br /> must be submitted within 60 days following completion of the fieldwork. If you have any <br /> questions please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> Joe Neely, Cambria <br />