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`V11, <br /> San Joaquin County DIRECTOR <br /> Environmental Health Department Donna Horan,REHS <br /> aeaepn <br /> P F' ASSISTANT DIRECTOR <br /> }, <br /> "Z Z� 600 East Main Street Laurie Cotuua;REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> •`. '' Carl Bwgman,REHS <br /> Mike Huggins,REHS,RDI <br /> �' •:�P Website: www.Sjgov.Org/ehd Margaret Lagorio,REHS <br /> Phone: (209) 468-3420 Robert MCClellon, REHS <br /> Fax: (209) 464-0138 ,teff Carruesco,REHS, Real <br /> Kasey Foley,REHS <br /> RAY BAGLIETTO & FRANK RAUz2 OCT 2 2 200 <br /> TULEBURG WAREHOUSE AB NAWAR <br /> 301 S AURORA STREET 8200 N HWY 99 <br /> STOCKTON CA 95203 STOCKTON CA 95212 <br /> RE: Speedy Food Mart SITE CODE: 1612 <br /> 8200 N. Hwy. 99 <br /> Stockton CA 95212 <br /> San Joaquin County Environmental Health Department (SJCIEHD) has reviewed "Feasibility <br /> Study; Enhancement of Existing Remediation Activities (Study) dated September 25, 2007, <br /> submitted on your behalf by Ground Zero Analysis, Inc. (Ground Zero) and has the following <br /> comments. <br /> Several issues recently discussed between SJCIEHD and Ground Zero are addressed in this <br /> Study. SJCIEHD requested that the proposed location of a confirmation soil boring be <br /> moved to confirm the.impact the soil vapor extraction (SVE) remediation had at the edge of <br /> the predicted radius of influence of the-system. Ground Zero would like to confirm the impact <br /> the SVE system had on the most highly impacted soil near vapor extraction well VEW-2. <br /> SJCIEHD approves the installation of two confirmation soil borings to address both areas of <br /> concern. .The borings will be installed as proposed in Work Plan for Additional-Subsurface <br /> Investigation dated May 11, 2007. Following installation of the confirmation soil borings, <br /> collection of soil samples for analysis and receipt of the results of those analyses, the need <br /> for additional remediation of impacted soil can be evaluated'. <br /> Three additional groundwater monitoring wells have been proposed to define the lateral and <br /> vertical extent of the groundwater contamination. SJCIEHD approved the wells with the <br /> recommendation that the well screens should be.shorter than proposed, and that care is <br /> taken during installation of the wells so that the screen intervals and filter packs do not bridge <br /> different water bearing intervals. 'Work on these wells has begun; Ground Zero has agreed <br /> screen intervals will not be longer than 10 feet, and only one water bearing zone will be <br /> intercepted by each well. <br /> SJCIEHD directed preparation of the Feasibility Study to evaluate alternatives for enhancing <br /> the remediation systems in use at the site. Ground Zero proposes that the most effective <br /> alternative to enhance the groundwater remediation system is installation of an additional <br /> groundwater extraction well located up gradient to existing wells MW-12 and EW-2. Ground <br /> Zero states that the groundwater extraction system has been effective in reducing the <br /> contaminant concentrations in groundwater by one to two orders of magnitude, and that <br /> installation of one additional well, built more appropriately to the lithology, will be the most <br /> cost effective way to enhance remediation of the down gradient plume. Work plan details of <br /> proposed construction of this well are included in the Study. SJCIEHD approves installation <br /> of this well. <br />