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go FILE COPY <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> °..0 SAN JOAQUIN COUNTY <br /> rf , . Donna K.Heran,R.E.H.S. UnitSupervisors <br /> 304 East Weber Avenue Third Floor Carl Eorgman,R.E.H . <br /> ., � Director ' R.E.H.S.Mike Huggins,R.E.H.S.,R.D.I. <br /> AI Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> ..cgcFORA�°' Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 <br /> Mark Barcellos,R.E.H.S. <br /> JAMES RINEHART / LORRE ISLAS MAY 0 62004 <br /> CITY OF STOCKTON <br /> CITY MANAGER' S OFFICE <br /> 425 NORTH EL DORADO, ROOM 301 <br /> STOCKTON, CA 95202 <br /> RE: FORMER CHASE CHEVROLET FACILITY <br /> 424 VAN BUREN <br /> STOCKTON, CA 95203 <br /> San Joaquin County Environmental Health Department (EHD) directs 500 pounds of <br /> oxygen releasing compound (ORC) be placed in the bottom of the excavation at 22 feet <br /> below surface grade (bsg) at the above-referenced site. The excavation was originally <br /> proposed in Soil and Groundwater Investigation Work Plan dated April 7,2004 prepared by <br /> Treadwell& Rollo as a clean up activity to remove the petroleum-hydrocarbon impacted soil <br /> that has been a continuous source of contamination to groundwater. EHD staff has , <br /> observed highly impacted soil below 22 feet bsg at the bottom of the excavation during <br /> recent field inspection. Previous analytical data of soil samples from on-site wells EW-3, <br /> VW-5,and recently soil borings 16B-6, 1613-9,and 1613-I1 also indicated the presence of <br /> contamination at below 22 feet bsg. Additional excavation below 22 feet bsg could not be <br /> achieved due to limitations of the shoring, excavation equipment, and crew safety concerns. <br /> EHD agrees with the placement of 500 pounds of ORC at the bottom of the excavation as <br /> an alternate supplemental remediation activity. <br /> Donna Heran,REHS,Director <br /> Environmental Health Division <br /> Jeffrey Wong, Senior REHS (J Margaret Lagorio,REHS <br /> LOP/Site Mitigation Unit Supervisor <br /> C: Treadwell&Rollo— David Dixon,RG <br /> C: RWQCB, Central Valley Region—James L.L. Barton,RG <br /> C: Department of Toxic Substance Control—Jerry Lile <br />