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ENVIRONXIENTAL HEALTH )JEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> N. "r X Director 304 East Weber Avenue,Third Floor Carl Borgrnan,R.E.H.S. <br /> Al Olsen, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> DouC4�1fiOR�,PProgram. Manager Telephone: (209)468-3420 Ma�laret LaWorio�R.R.E.H.S. <br /> Laurie A. Corolla, R.E.H.S. Fax: 209 464-0138 g g <br /> E <br /> Program Manager ( ) Robert McClellon, R.E,H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> TRUST OF MARY GARDELLA JAN 0 9 2006 <br /> WINIFRED ALEXANDER <br /> 525 2"D ST <br /> SANTA CRUZ CA 95050 <br /> ESTATE OF JOE GARDELLA <br /> DENNIS CASPE ESQ <br /> 2035 N PACIFIC AVE <br /> SANTA CRUZ CA 95050 <br /> RE: STEFANOS GASOLINE <br /> 1419 E CHARTER WAY <br /> STOCKTON, CA 95205 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Interim Soil <br /> Vapor Extraction Pilot Test Deport(SVE report) dated September 27, 2005 prepared by <br /> Advanced GeoEnvironmental, Inc. (AGE), and Third Quarter 2005 Quarterly Report(QMR) <br /> dated December 14, 2005 also prepared by AGE. A soil vapor extraction system operated at <br /> the above-referenced site between November 2004 and June 2005 to remediate the <br /> contamination in the vadose zone. Analytical results of the influent vapor sample were <br /> 14,000 micrograms per liter (ug/1) of Total Petroleum Hydrocarbons as gasoline (TPH-g) in <br /> November 2004, to continuously non-detect (detection limit at 50 ug/1) in June 2005. <br /> Depth to groundwater rose approximately abut 2 feet between Nov 2004 and September <br /> 2005 according, from 45.20 feet below surface grade (bsg) to 42.82 feet bsg in monitoring <br /> well MW-2. Based on the results of the vapor samples,AGE calculated 383.7 gallons of <br /> gasoline had been removed during this period. AGE recommended in the SVE report to <br /> discontinue the SVE system, and to collect soil samples to evaluate the current condition of <br /> the vadose zone. AGE recommended in the QMR to continue operation of the ozone <br /> in)ection system to treat the contamination in the groundwater, and to reduce groundwater <br /> sampling of monitoring wells MW-4 through MW-7 to a biannual basis, since the results of <br /> the groundwater samples from these wells have been continuously reported as "non-detect" <br /> for all analytes including oxygenates and lead scavengers. <br /> Based on repeated non-detect results of the influent vapor samples, and diminishing vadose <br /> zone due to rising groundwater, EHD concurs with AGE's recommendation that operation <br /> of the SVE system should be discontinued at this time. EHD has commented and approved <br /> (with conditions) the previously submitted Interim Remediation Confirmation Borings Work Plan <br /> dated June 27, 2005 prepared by AGE proposing collecting subsurface soil samples for <br /> confirmation purpose. This work plan approval has been mailed separately. <br />