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I <br /> e • <br /> San Joaquin County <br /> Environmental ronmental Health Department <br /> �•'� DIRECTOR <br /> r. 1868 East Hazelton Avenue Donna Heran,REHS <br /> a: a <br /> m' Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> • Jeff Carruesco,REHS, RDI <br /> cq4/F6,0�vl Website: www.SjgOV.org/ehd Kasey Foley,REHS <br /> Phone: (209) 468-3420 Linda Turkatte,REHS <br /> Fax: (209)464-0138 Rodney Estrada,REHS <br /> Adrienne Ellsaesser,REHS <br /> August 22, 2014 <br /> Mr. Sheldon eranishi <br /> 1600 D m Ferry Road /i a l 6-Y-4/4 S1 <br /> TrqPKCaliflnia 95304-8799 A/ Ain eGrCf / C /� ��/ ' Vo Z� <br /> Subject: Former George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California 95376 <br /> Dear Mr. Teranishi: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Work Plan Remedial Effectiveness & Proposed Remedial System Expansion (work plan), <br /> dated 10 July 2014, prepared by your consulting firm, Ground Zero Analysis, Inc. (GZA) on <br /> your behalf for the above-referenced site. In the work plan, GZA proposes to remove <br /> contaminant vapors from the native soil beneath and adjacent to the existing building at the <br /> site as follows: <br /> • Install two additional insitu air sparge (AS) wells (AS-7 and AS-8), screened twenty to <br /> twenty-five feet below surface grade (bsg), while collecting soil samples between five <br /> and twenty-five feet bsg for lithologic evaluation and 'to evaluate' the vadose and <br /> smear zones; <br /> • Install eight additional soil vapor extraction (SVE) wells (VEW-3 through VEW-10), <br /> screened five to ten feet bsg, while collecting soil samples between five and ten feet <br /> bsg for lithologic evaluation and 'to evaluate' the vadose zone; <br /> • Advance three additional soil borings; although the work plan does not specifically <br /> state the proposed total depth of the three borings, the EHD has confirmed that GZA <br /> proposes to advance the three borings to ten feet bsg while collecting soil samples <br /> between five and ten feet bsg for lithologic evaluation and to evaluate soil <br /> contamination in the vadose and smear zones; <br /> • Install the two AS wells and eight SVE wells using a hand auger, and advance the <br /> three borings using either a hand auger or Geoprobe, all at locations illustrated on <br /> Figure 3 of the work plan; <br /> • Collect a five-foot soil sample at each borehole for chemical analysis of total petroleum <br /> hydrocarbons as gasoline (TPH-g); benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX); methyl tertiary-butyl ether (MTBE), 1,2-dichloroethae (1,2-DCA) and lead; in <br /> addition to the five-foot soil sample, GZA proposes to collect up to two additional soil <br /> samples from each AS well and one additional soil sample from each SVE well for <br /> chemical analysis; and <br />