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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> )�•_��%cp I) Donna Heran,REHS <br /> r.` 1868 East Hazelton Avenue <br /> �, -Lmllls � Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,REHS, RDI <br /> Kase <br /> C4 <br /> Website: www.sjgov.org/ehd Linda Foley,RENS Linda Turkatte,REHS <br /> Phone: (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209) 464.0138 Adrienne Ellsaesser,REHS <br /> May 30, 2013 <br /> Mrs. Mei Teranishi <br /> 1600 Durham Ferry Road <br /> Tracy, California 95304-8799 <br /> Subject: Former George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California 95376 <br /> Dear Mrs. Teranishi: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Additional Air Sparge Well Installation Work Plan (work plan), dated 21 May 2013, prepared by <br /> your consulting firm, Ground Zero Analysis, Inc. (GZA) on your behalf for the above-referenced <br /> site. Noting the favorable increased concentrations of dissolved oxygen in observation wells <br /> OW-1 and OW-2, GZA proposes to install three additional air-sparge wells to address the core <br /> of the petroleum hydrocarbon contamination plume in the area of former underground storage <br /> tanks 1 and 2 and monitoring well MW-2. <br /> In the work plan, GZA proposes to: <br /> • Install air-sparge wells AS-4 through AS-6, screened between approximately twenty and <br /> twenty-five feet below surface grade (bsg) at locations illustrated on Figure 2 of the work <br /> plan; <br /> • Continuously collect soil samples for lithologic evaluation and laboratory analysis during <br /> advancement of the three air-sparge wells, beginning at depths below the excavation <br /> backfill and continuing to total depth of approximately twenty-five feet bsg; and <br /> • Analyze the soil samples for total petroleum hydrocarbons as gasoline (TPH-g); and <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX). <br /> The EHD approves the proposed work plan with the following conditions: <br /> • Relocate proposed air-sparge well AS-5 outside the former tank pit area, adjacent to <br /> George's Service building; based on the high concentrations of contaminants of concern <br /> detected during the advancement of soil boring HB-4 and collection of the soil samples <br /> labeled 'southeast and southwest sidewalls' during the soil excavation, significant <br /> concentrations of petroleum contaminants are suspected to lie beneath the building. <br /> The EHD believes targeting this area may reduce the adsorbed petroleum hydrocarbon <br /> contaminants; and <br />