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i <br /> ENVIRONMENTAL HEALTH EPARTMENT <br /> o <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> A]Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • c'°i, Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> Mike Wallace Mr. Jeffery Setness <br /> City of Stockton Redevelopment 4568 Feather River Dr <br /> 305 North E1 Dorado, Suite 200 Suite A <br /> Stockton, CA 95202 Stockton, CA 95219-6508 <br /> RE: FORMER CHASE CHEVROLET FACILITY <br /> 424 VAN BUREN <br /> STOCKTON, CA 95201 <br /> WORKPLAN: Feasibility and Monitoring Well Installation Work Plan <br /> DATED: April 17, 2002 <br /> PREPARED BY: Advanced GeoEnvironrnental. Inc. <br /> ❑ APPROVED with Conditions (See Below) <br /> ❑ DISAPPROVED <br /> ❑ ADDENDUM Submit by <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25299.37,subd.(c)(3).): <br /> 1. Destroy and replace Vapor Extraction Well#3 (V-3). <br /> 2. Install six pilot ozone sparging wells on site. <br /> 3. Install one groundwater monitoring well across the site on the north side of Fremont <br /> Street. <br /> 4. Conduct an ozone sparge pilot test over an approximately 6 month-interval. <br /> COMMENTS AND CONDITIONS: <br /> 1. EHD recommends using sugar sand for packing material and Viton O-rings <br /> between tri-loc junctions as per manufacturer recommendation (McCulloch <br /> Environmental Equipment Sales on KVA C-sparger) <br /> 2. In a telephone conversation with AGE on May 15,2002,AGE confirms <br /> construction of the sparge wells will be using 2"x30" sparge-points by KVA <br /> REASONS FOR DISAPPROVAL OF THE WORKPLAN (H&S 25299.37, <br /> subd.(C)(3).): <br /> None <br /> DATED May 15.2002 BY <br /> C: Advanced GeoEnviromnental, Inc.—Paul Dotsun <br /> C: RWQCB,Central Valley Region—Marry Hartzell <br />