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San Joaquin County DIRECTOR <br /> oU�N Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> � GLaurie CotulJa,REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 <br /> �< PROGRAM COORDINATORS <br /> Carl Borgman, REHS <br /> C .. s P Mike Huggins, REHS,RDI <br /> a�iRd� Website: www.sjgov.org/ehd <br /> Margaret Lagorio,REHS <br /> Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> CRAIG OGATA JUL 4 3 2007 <br /> DIRECTOR OF FACILITIES MANAGEMENT <br /> 212 N SAN JOAQUIN STREET SUITE A <br /> STOCKTON CA 95202 <br /> RE: San Joaquin County Courthouse SITE CODE: 1285 <br /> 222 East Weber Avenue RO: 11 <br /> Stockton, CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Additional <br /> Site Investigation and Groundwater Monitoring Report Fourth Quarter 2006 submitted <br /> by Ramage Environmental, Inc. (Ramage Environmental) on your behalf In this report <br /> Ramage Environmental presents soil and groundwater results for samples collected from <br /> three direct push soil borings (B-4, B-5, and B-6) and groundwater results from samples <br /> collected from twin cone penetration testing (CPT) boring CPT-1, all advanced on <br /> January 13, 2007. Also included in this report are results from the fourth quarter 2006 <br /> groundwater monitoring event. <br /> Chemicals of concern (COC) have not been detected in any of the nine soil samples <br /> collected at total depths of twenty-four feet below surface grade (bsg) from B-4 and B-5, <br /> and thirty--six feet bsg from B-6. Methyl tertiary-butyl ether (MTBE) was the only COC <br /> detected in the four groundwater samples collected from B-4, B-5, B-6, and CPT-1. The <br /> highest concentration for MTBE was reported at 3.1 micrograms per liter (gg/L) in <br /> groundwater samples collected between 35 and 39.5 feet bsg from CPT-1. Based on <br /> these results, EHD is reviewing current and historical data for site closure consideration. <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) is requiring <br /> evaluation of Environmental Screening Levels (ESLs), California Human Health <br /> Screening Levels (CHHSLs), (San Francisco Bay Regional Water Quality Control Board) <br /> and the potential for vapor intrusion into buildings for closure consideration of sites <br /> having residential contamination left in place. Therefore, you need to evaluate the threat <br /> of vapor intrusion inside the buildings located onsite. Please provide a rational, with <br /> technical support, for discounting vapor intrusion into the buildings as a potential hazard <br /> for this site or submit a work plan to EHD by August 31, 2007, to assess the potential for <br /> vapor intrusion into the existing onsite buildings. <br />