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San Joaquin County Environmental Health Department DIRECTOR Donna Heran,REHS 1868 East Hazelton Avenue Stockton, California 95205-6232 PROGRAM COORDINATORS Robert�.'. + f s • llon,REHS Jeff Carru sco ,REHS RDI : = Kasey Foley,REHS Website: www.sjgov.org/ehd Linda Turkatte,REHS �rFOR Phone: (209)468-3420 Fax: (209) 464-0138 October 30, 2012 Ms. Sandi Sarale P.O. Box 6066 Stockton, California 95206 Subject: Saraie f=arms 16500 West Clifton Court Roast Stockton, California 95206 Dear Ms. Sarale: The San Joaquin County Environmental Health Department (EHD) has received and reviewed the State Water Resources Control Board Underground Storage Tank Cleanup Fund (CUF) Five-year Review Summary Report (report), having completed the CUF S third review of this site. In the report, the CUF concurred with the EHD that it would be appropriate to sample the nearby domestic well, and "assess the potential for indoor vapor migration". The CUF further recommended that shallow soil samples be collected and include the analysis for naphthalene to assess direct contact risks. By letter dated 26 July 2012, the EHD had notified you that this agency could not move this site to closure having been informed by your consulting firm, Advanced GeoEnvironmental, Inc. (AGE), that the potential exists for soil vapor intrusion from petroleum hydrocarbon-impacted soil into existing on-site structures. As a result, the EHD directed that data or a model be provided to demonstrate either the high or low threat posed by soil vapor. In response, AGE submitted No Further Action Required Report Addendum & Soil Vapor Intrusion Work Plan — August 2012 (work plan) dated 17 August 2012. In the work plan AGE proposed to: s Collect three shallow soil gas samples at locations illustrated on Figure 2 of the work plan; Advance each borehole using direct push technology to total depth of three feet below surface grade (bsg) since first groundwater levels are approximately four feet bsg; • Insert a Geoprobe soil vapor assembly that includes disposable polyethylene tubing into the borehole such that the assembly is able to retract approximately six inches from the bottom of the borehole; • Allow a twenty minute stabilization period once the soil vapor assembly is in place; Purge the system until approximately three volumes of soil gas (not ambient air) are evacuated through the sampling system;