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ENVIRQNMENTAL � <br /> EALTH DEPARTMENT <br /> z SAV JOAQUIN COU <br /> Donna K.Heran,R.E.H.S. <br /> _< NTy- <br /> �"'` DirectorUnit Supervisors <br /> 304ast Weber Avenue <br /> j A2 Olsen,RE.H.S. , Third Floor Carl Bot m <br /> i °v'�•i o.Ra:� • Program Manager Stockton, California 95202-2708 Mike Huggins RE.H S�S <br /> Tele h R.D.I. <br /> Laurie A.Cotulla,R.E.H.S. p one: 209 Douglas W. Wilson,R.E.H.S. <br /> t ) 468-3420 <br /> Program ManagerFax: {209) 464-0138 Margaret Lagorio,R.E.H.S. <br /> Robert McClellon,R.E.H.S. <br /> f <br /> Mak Barcellos,R.E.H.S. <br /> KYLE CHRISTIE T 2 t 2005 <br /> F . <br /> ATLANTIC RICHFIELD COMPANY ROSE V RODGERS TRUST ETAL <br /> 6 CENTERPOINT DRIVE., 6-161. BILL & LORRAINE HALVORSON <br /> CA 9Q623-1106066 <br /> LA PALMA 10040 DAVIS ROAD <br /> STOCKTON CA 95209 <br /> San Joaquin County Environmental Health DepartmentS <br /> Plan for the Abandonment of a Gr ( JC/EHonitotj D) has reviewed <br /> Soil Vapor Extraction/Air Sparge Groundwater T eatmen System, and l of an Int tim <br /> Groundwater Monitoring Wells—Addendum 11/(Addendum) dated October <br /> 20 of <br /> submitted on your behalf by URS Corporation (URS) r 20, 2005, <br /> ( ) and has the following comments <br /> In Addendum III URS proposes to change the construction of the 22 nested soil <br /> ` vapor <br /> extraction/air sparge (SVE/AS) wells, the installation of which wa <br /> in correspondence dated June 23, 2005. The SVE/AS wells are to be constructed <br /> nested wells in one borehole; the screen intervals of the AS wellss approved by SJC/EHD <br /> feet below surface grade (bsg) and those of the SVE wells will be at 15_ sg as <br /> which means they will be below.the groundwater sura will be placed25 feet bsgat 36-38 <br /> , <br /> construction called for the interval between the filter packs of the respective wells to be <br /> S <br /> filled with bentonite-grout-bentonite. In Addendum III URS re u originally proposed <br /> the entire seven-foot interval between filter a q ests approval of sealing <br /> change in construction with the condition that verification ist made that this rDnterval is <br /> g <br /> completely submerged below groundwater. Bentonite chips desiccate hi rapidly peal this <br /> therefore not an appropriate sealing material in tonne + <br /> p ly and are <br /> zone soil. <br /> If You have any questions please call Lori Duncan at (209)468.0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department a <br /> Lori Duncan, Senior REHS <br /> LOP/Site Mitigation Unit IV Nuel C, Henderson' <br /> Jr., PG <br /> LOP/Site Mitigation Unit IV I <br /> cc: James Barton, PG, CVRWQCB <br /> Vern Elarth, PG, URS <br />