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CES® Date #o! , 1 p u f 1y <br /> Post-it"Fax Note 7671 �.z.�.(o pages J p?• <br /> To From <br /> Go./D6L f.,rL CoSIGN I ■ `' :< <br /> Phone:# Phone# o leaith O Efi <br /> Fax# � u C� 1 Fax# cktOn, CA 95 Ol- $$ 4�1FgR�� <br /> .. ... _ s AU G 0 1 1996 <br /> DALE STEELS <br /> CALTRAN S <br /> PO BOX 2048 <br /> STOCKTON CA 95201 <br /> Re: Caltrans Shop 10 j Site Cade: 1018 <br /> 1603 South "B" Street !E <br /> Stockton CA 95205 r <br /> San Joaquin County, Public Health Services, Environmental Health Division (PHSIEHD) has completed <br /> review�of your correspondence dated July 24, 1996 which included the additional scope of work which <br /> PHSIEHD requested in correspondence dated July 3, 1996. PHSIEHD:has prepared the following <br /> comments for your consideration. <br /> �� <br /> In addition i to the reconstruction of monitoring well, MW11, and tti1 e installation of vapor monitoring <br /> wells, ',iVM1 and VM2, two monitoring wells will be installed so that the i6nitoring capabilities at the <br /> site can accommodate the fluxuating groundwater level at the site. The,monitoring wells will be <br /> constructed with 20 feet of screen, 5 above and 15 below first water. <br /> 1 <br /> Your correspondence indicated that only one soil sample from the monitoring wells would be submitted <br /> for laboratory analysis. As PHSIEHD has stated previously, sufficient soil samples should be <br /> submitted to determine the vertical and horizontal extent of soil contamination. Groundwater has risen <br /> dramatically over the last several years; therefore, soil which was previously in the vadose zone is <br /> now located in the saturated zone. In response to this, PHSIEHD recommends that, in order to <br /> evaluate the vertical distribution of contamination, soil samples be collected beneath first water for <br /> } laboratory analysis. <br /> Also, the selection of soil samples which will be submitted for analysis from the vapor monitoring wells <br /> should be based on prior soil information and conditions observed during the installation of the wells. <br /> PHSIEHD requests that you confer with PHSIEHD prior to laboratory submittal of the soil samples. <br /> PHSIEHD discussed with Richard Walls of Geocon Environmental alternate locations for the additional <br /> groundwater monitoring wells; however, the site map enclosed with your correspondence proposed that <br /> the weils be located outside of the potential building's footprint. Pleasei�recognize that technically there <br /> are more appropriate locations for the wells, but to accommodate Caltrans potential future plans, the <br /> locations are approved as proposed. <br /> a fl <br /> PHSIEHD understands that the work is scheduled beginning on August;5, 1996. if there are any <br /> changes to the schedule or to discuss soil sample analysis, please contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division9 <br /> VV\` <br /> Mary *ays, Senior REHS Margaret gorio, REHS. <br /> Site Mitigation Unit Supervisor i <br /> 'r <br /> mm/1603B i <br /> IF .i <br /> CC' Elizabeth Thayer, CVRWQCB cc: Richard Walls, Geocon <br /> , .g <br /> + i A Division of San Joaquin County Health Care Services <br />