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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> -� Al Olsen,R.E.H.S. StOCkton, California 95202-2708 <br /> :'• Douglas W.Wilson,R.E.H.S. <br /> • .. �P Program Manager {Telephone: 209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Q{iFii"R`' Laurie A.Cotulla,R.E.H.S. h <br /> Fax: (209) 464-01.38 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> r <br /> ARTHUR L WYATT JR <br /> 6265 CROOKED STICK DEC 2 -3 2003 <br /> STOCKTON CA 95219 <br /> RE: FORMER ARCO AM/PM SITE CODE: 1216 <br /> 4511 PACIFIC AVENUE <br /> STOCKTON CA <br /> WORKPLAN: Remedial Action Work Plan—'December 2003 DATED:December 22 2003 <br /> PREPARED BY: Advanced GeoEnvironmental Inc. AGE <br /> APPROVED <br /> DISAPPROVED ❑ <br /> ADDENDUM ❑ Submit by: <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S 25299.37(c)(3)): <br /> 3 i <br /> 1. Install one additional groundwater extraction well to enhance the coverage of the existing <br /> groundwater extraction system. <br /> 2. Install 3 soil vapor extraction (SVE)wells screened from 20 to 40 feet bsg in the area of <br /> VW-1,and a SVE system that includes an electrically-powered blower and catalytic oxidizer <br /> destruction unit,and a below-surface piping network to remove the contaminants in the <br /> vadose zone. Initiate,monitor, and maintain operation of the SVE system. Y <br /> COMMENTS AND CONDITIONS: <br /> 1. The work plan proposed collecting samples from"core"area of the contamination on site <br /> after 12 months of operation of the SVE system,or when the efficiency of the SVE unit has <br /> declined to determine the remaining petroleum hydrocarbon remaining in the soil. <br /> Environmental Health Department (EHD) has determined that soil samples should be <br /> collected significant amount of contaminant mass in the soil has been removed and the <br /> efficiency of the SVE system has fallen such that maintaining operation of the SVE system <br /> is no longer a cost-effective remediation alternative. Soil samples should not be collected r <br /> operation for 12mo <br /> months. <br /> ' <br /> solely because the system has been to o p <br /> 2. Implement work by January 24,2004, <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25299.37(C)(3)}: <br /> None ` <br /> DATED December 23 2003 BY Jeffre Won <br /> Cc: CRWQCB,Central Valley Region—James L.L.Barton,RG <br /> al Inc. <br /> —Bill Little <br /> Advanced GeoEnvironment , <br /> Fax: r <br />