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0 <br /> Page 2, 2050 Fremont St. <br /> SJC/EHD approves the installation of one onsite shallow groundwater monitoring well <br /> located down gradient to MW-15. SJC/EHD believes this well should be placed midway <br /> between MW4 and MW-6 , and further east than the location proposed in the Study. <br /> SJC/EHD approves the installation of one deep groundwater monitoring well proposed near <br /> MW-5 , but it should be located on the southeast side of MW-5 in the predominant <br /> groundwater flow direction. This well should be screened in the sand unit present at <br /> approximately 109- 120 feet bsg based on cone penetrometor test boring CPT-8. Soil and <br /> grab groundwater samples should be collected during the drilling of the borehole for this well <br /> at depths of 85- 100 feet below surface grade (bsg) to confirm the analytical results and the <br /> lithological profile from CPT-8. <br /> SJC/EHD approves the installation of one groundwater extraction well to perform a pumping <br /> test, and to collect soil and groundwater samples to assess for baseline conditions and to <br /> conduct an ozone infusion bench scale test. <br /> SJC/EHD approves discontinuing analysis for tentatively identified compounds . Quarterly <br /> analysis should continue for total petroleum hydrocarbons as gasoline, benzene, toluene, <br /> ethyl benzene , xylenes, fuel oxygenates , 1 ,2-dichloroethane and ethylene dibromide by <br /> appropriate EPA approved laboratory methods . <br /> Please proceed with submittal of a work plan for the approved work. The work plan is due no <br /> later than November 9 , 2007 . <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Donna Heran , REHS , Director <br /> Environmental Health Department <br /> ce � <br /> Lori Duncan , Senior REHS Nuel C. Henderson , Jr. , PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton , PG , CVRWQCB <br /> Art Deicke, AGE <br />