Laserfiche WebLink
ENVIRONMENTAL HEALTH DEPARTMENT <br /> OPO.U, Iry C <br /> Donna K. Henan, R.E.H.S. SAN JOAQUIN COUNTYProgram Coordinators <br /> Director <br /> 304 East Weber Avenue, Third Floor Cart Borgman, R.E.H. S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton, California 95202-2708 Mike Huggins, R.E.H.S ,, R.D.I. <br /> Assistant Director Margaret Lagorio, R.E.H.S. <br /> e FadN` Telephone: (209) 468-3420 Robert McClellan, R.E.H.S . <br /> Fax: (209) 464-0138 Jeff Carruesco, R.E.H.S. <br /> Website : www. sjgov.org/ehd/ Kasey Foley, R.E.H.S . <br /> FEB 2 6 2001 <br /> GARY STALLWORTH LEWIS STALLWORTH <br /> 602 CALIFORNIA STREET 1107 BURKETTE AVE <br /> STOCKTON CA 95202 STOCKTON CA 95205 <br /> RE : Stallworth Auto Sales SITE CODE : 2486 <br /> 602 California Street <br /> Stockton CA 95202 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Soil <br /> Vapor Extraction/Air Sparge Feasibility Testing Work Plan Addendum (Addendum) dated <br /> February 1 , 2007, submitted on your behalf by Advanced GeoEnvironmental , Inc. (AGE) <br /> and has the following comments. <br /> For clarification , SJC/EHD has never directed installation of "an air sparge well with the <br /> upper portion of the screen partially located within the sand unit at thirty-four feet below <br /> surface grade" as was twice stated in the Addendum. SJC/EHD's comment concerning <br /> the air sparge (IAS) well proposed by AGE in the original Soil Vapor Extraction/Air Sparge <br /> Feasibility Testing Work Plan (Work Plan) dated December 14, 2006, was that before <br /> SJC/EHD could approve its installation , a demonstration is needed to show that sparged <br /> air and stripped contaminants are likely to be recovered by the proposed soil vapor <br /> extraction (SVE) system. The proposed depth of the IAS well was 40 feet below surface <br /> grade (bsg) , with a 5-foot screen interval, This construction would place the screen <br /> interval in a clay/silt lithology. <br /> AGE has responded in the Addendum by proposing to install the well to only 39 feet bsg <br /> so that the top of the screen interval may intercept a sand interval , and to extend the filter <br /> pack of the well two feet above the screen . AGE states that this construction `will allow <br /> for manipulation of the groundwater within the sand unit at 30 feet bsg . I "' What does <br /> "manipulation of the groundwater ' mean , and how would it be of benefit to the proposed <br /> air sparge test? <br /> In recent correspondences SJC/EHD has directed submittal of a feasibility study, and if <br /> needed , a work plan for feasibility testing to address remediation of the petroleum <br /> hydrocarbon contamination documented at your site (correspondence dated <br /> October 12, 2006), and submittal of a feasibility study specifically addressing the <br /> groundwater contamination (correspondence dated January 2, 2007). These directives <br /> were issued per the California Code of Regulations which requires that prior to selection <br /> and implementation of a cleanup technology at a contaminated underground storage tank <br /> ( UST) site, a feasibility study must be prepared to determine which cleanup technology <br /> will work most effectively at the site. The study must compare at least two cleanup <br /> technologies for both their potential remedial effectiveness and cost, <br />