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�•• ..w <br /> San Joaquin County <br /> .� Environmental Health Department DIRECTOR <br /> ).• _,Ef .O Donna Heran, RENS <br /> 1868 East Hazelton Avenue <br /> c: PROGRAM COORDINATORS <br /> 0. " X Stockton, California 95205-6232 Robert McClellon,REHS <br /> Jeff Carruesco, REHS,RDI <br /> Cq •. ��P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> C�p oFt <br /> Phone: (209) 468-3420 Linda Turkatte, REHS <br /> Fax: (209) 464-0138 <br /> April 8, 2013 <br /> Aurangzeb (Zeb) Khan Charan Singh Dhillon Etal <br /> 3128 Jasper Ave. 2057 S. EI Dorado Street <br /> Modesto, CA 95350 Stockton, CA 95206 <br /> Subject: Quick N' Save #2 <br /> 2057 S. EI Dorado Street <br /> Stockton, CA 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Quarterly Report, 3rd Quarter 2012, and Work Plan for Additional Site <br /> Assessment and Remediation Pilot Testing submitted on your behalf by your consultant <br /> Stratus Inc. In the work plan, Stratus proposes to: 1) install five sets of paired wells with <br /> shallow wells screened from 15 to 30 feet below surface grade (bsg) and deeper wells <br /> screened 35 to 45 feet bsg for lateral assessment of impacted groundwater; 2) advance <br /> two cone penetration testing (CPT) borings to 120 feet bsg to assess vertical extent of <br /> impacted groundwater; and 3) install two dual completed ozone sparge wells to conduct <br /> a 60-day ozone injection plot test. <br /> The lateral and vertical extent of groundwater contamination remains undefined on-site <br /> and off-site, and groundwater contamination in the on-site source area remains <br /> extremely high, therefore further investigation and remediation is warranted. A soil and <br /> groundwater remediation system was installed at the site, but has not been fully <br /> implemented. The soil vapor extraction (SVE) portion of the system has been operated, <br /> but groundwater extraction (GWE) portion of the system has not been implemented due <br /> to the anticipated operational and disposal costs exceeding the current California State <br /> Water Resources Control Board Cleanup Fund (CUF) 2012-2013 budget. The SVE <br /> operation has reached a point where it has become inefficient for removing appreciable <br /> contaminant mass (currently removing less than 1 pound per day). <br /> Groundwater at the site has risen appreciably since the remediation system was <br /> designed and installed, and the screen intervals on the soil vapor remediation wells have <br /> been inundated (flooded) with water, reducing the targeted vadose zone remediation. As <br /> noted by Stratus, these wells could now be utilized to monitor shallow groundwater if the <br /> data would be useful. The EHD notes that the proposed shallow monitoring wells would <br /> be screened across fine-grained soil, which usually is associated with limited hydraulic <br /> conductivity and tends to adsorb hydrocarbon contaminants; while the proposed deeper <br /> wells would be screened across coarse-grained soil, which commonly has higher <br /> hydraulic conductivity and less retardation of hydrocarbon contaminants; therefore the <br /> EHD approves installation of the deeper screened well (35 to 45 feet bsg), but does not <br /> consider the shallow screened monitoring wells (15 to 30 feet bsg) necessary. If <br />