Laserfiche WebLink
w <br /> . San Joaquin County <br /> - � DIRECTOR <br /> off""'N Environmental Health Department DonnaHeran,REHS <br /> ...__... c <br /> .0 ASSISTANT DIRECTOR <br /> r.'.s. .- : . 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 <br /> - PROGRAM COORDINATORS <br /> • °e :.: Carl 8orgman,REHS <br /> r ._ P Mike Huggins,REHS,RDI <br /> a ::.:: • Website: www.sjgov.org/ehd <br /> Margaret Lagorio,REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> � WUL 0 3 2507 <br /> RAY BAGLxETTO & F �;�+ ~� L � } <br /> TULEBURG WAREHOUS - ��_:___�____,-. <br /> i ;j j AB NAWAR <br /> 301 S AURORA S TRE j'1 8200 N HWY 99 <br /> STOCKTON CA 952 Q, � � 6 ZQQ7sl <br /> STOCKTON CA 95212 <br /> RE: Speedy Food Ma�. SITE CODE: 1612 <br /> 8200 N. Hwy. 99 <br /> Stockton CA 95212 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Work <br /> Plan for Additional Subsurface Investigation (Work Plan) dated May 11, 2007 submitted <br /> on your behalf by Ground Zero.Analysis,. Inc. (GZA) and has the following comments. <br /> The Work Plan proposes the installation of one soil boring to evaluate the effectiveness <br /> of soil vapor extraction on.the.sorbed contamination near the former underground. <br /> storage tank (UST) area, three'groundwater monitoring wells to investigate the lateral <br /> and vertical extent of the groundwater contamination in the deeper zones, and one <br /> additional groundwater extraction well. The Work Plan also discusses modifications and <br /> enhancements to groundwater remediation processes in use at the site. <br /> .In the May 20, 2004 report on the soil vapor extraction pilot test results, GZA calculated <br /> a radius of influence of approximately.30 feet for the vapor extraction wells. SJC/EHD <br /> approves the installation of one.confirmation soil boring located near VW-2, but requests <br /> that the boring be placed near MW-1 and SB-2. The boring.will be advanced by hollow I <br /> stem auger; soil samples will be collected every five feet from surface to approximately <br /> 80 feet below surface grade (bsg). All samples collected from 15 feet bsg to total depth <br /> will be submitted for laboratory analysis for total petroleum hydrocarbons as gasoline; <br /> benzene, toluene,.ethylbenzene, xylenes and fuel oxygenates. <br /> Three additional groundwater monitoring wells are proposed to define the vertical extent, <br /> and the lateral extent at depth, of the groundwater contamination. One "B Zone"well will <br /> be installed near MW-12; one "C Zone"well and one "D Zone" well will be installed near <br /> MW-8. SJC/EHD approves the installation of these wells, but cautions that care should <br /> be taken during installation to ensure the screen intervals and filter packs do not bridge <br /> two sand zones. A shorter (10 or 15-foot) screen interval may be more appropriate. <br /> At a meeting on January 25, 2007 GZA indicated the groundwater extraction (GWE) <br /> system in operation at this site was not ideally effective; flow rates were very low due to <br /> the aquifer properties and problems with operation of the system, including scaling, <br /> channeling and frequent contaminant breakthrough of the carbon were continuing. GZA <br /> now proposes the installation of one additional groundwater extraction well, stating that <br />