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ENVIRONMENTAL SIE <br /> ALTA <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> . . 4 <br /> Carl Borgman,R.E.H.S. <br /> Donna K. ebeAvenu C <br /> Heran,R.E.H.S. e, Third Floor <br /> -_A 304 East W r, Mike Huggins,R.E.H.S.,R.D.I. <br /> Director <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Telephone: (209) 469-342 <br /> 0 Margaret Lagorio,R.E.H.S. <br /> Program Manager Telep McClellon,R.E.H.S. <br /> 7 F.OW" Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert <br /> Program Manager Mark-Barcellos,R.E.H.S. <br /> JERRY SULLIVAN <br /> KOHLBERG KRAVIS & ROBERTS <br /> 3478 BUSKIRK AVE <br /> PLEASANTON CA 94523 <br /> RE: Former American Forest Products <br /> 2801 West Lane <br /> Stockton,CA <br /> NVORKPLAN: Work Plan for 1-2 DCA Investition DATED: 04102Z <br /> 02 <br /> PREPARED BY: URS CoKporation <br /> APPROVED X <br /> DISAPPROVED D <br /> ADDENDUM U Submit by <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE'WORKPLAN (IJ&S 25299.37,subd.(c)(3).): <br /> 1. Advance eight soil borings on-site to define the lateral and vertical extent of 1-2 DCA groundwater <br /> contamination. <br /> .2. Collect depth discrete grab groundwater samples,limiting cross contamination according to standard <br /> operating procedures of CPT hydro-punch technology: DMW-2 is screened from 60 to 80 feet below <br /> surface grade.Therefore,in order to define the L vertica.I extent of groundwater contamination,a discrete <br /> sample must be taken in a permeable zone below 80 feet. <br /> 3. Sample depths will be based on preferential pathways not set depths of 40 and 55 feet below surface grade. <br /> 14 More than two samples per boring may be needed.. <br /> 4. Grab groundwater samples will be analyzed by EPA method 82608. Report all peaks shown by this <br /> analysis. <br /> COMMENTS AND CONDITIONS: <br /> 1. The statement on the cover page of the above referenced report that once the 1-2 DCA plume is defined, <br /> closure will be granted,is false. The responsible party may need monitoring wells to show the 1-2 DCA <br /> plume is stable and decreasing in concentratior�'over time. <br /> 2. A well permit application is needed along with the standard$89 fee for wells and soil borings in San <br /> Joaquin County. One application and fee per Parcel Per contractor. <br /> 3. Notify PHS/EHD at least 48 hours prior to the proposed scheduled work dates. <br /> DATED BY <br /> Sam-Savig.EHS,"' <br /> LOP/Site Mitigation Unit IV <br /> Cc: CVRWQCB—Marty Hartzell <br /> URS Corporation-Jack Kemp <br /> American Molding and Millwork-Bernie Sloop <br />