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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> •cOG Donna Heran,REHS <br /> 600 East Main Street <br /> : Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> ) <br /> �: F�,;ul�; � Robert McClellon, REHS <br /> . <br /> Jeff Carruesco,RENS,RDI <br /> r• Kasey Foley,REHS <br /> Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> q��Foa� Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> September 1, 2011 <br /> Mr. Weldon Church <br /> 1958 Yosemite Road <br /> Berkeley, California 94707 <br /> Subject: Weldon Church Property <br /> 104 West Beverly Place <br /> Tracy, California 95376 <br /> Dear Mr. Church: <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Crawl <br /> Space Air Investigation Report (report), dated 04 August 2011, submitted by your consulting <br /> firm, Advanced GeoEnvironmental; Inc. (AGE) on your behalf for the above-referenced site. <br /> By letter dated 01 April 2011, the EHD had conditionally approved Crawl Space Air <br /> Investigation Work Plan, dated 28 February 2011, to address collecting air samples at your <br /> site. <br /> In the report, AGE presented the analytical results from collecting an air sample from the <br /> crawl space beneath the dwelling at the above-referenced site, and two ambient air samples <br /> from the southwest and southeast areas of the backyard of this residency. The air samples <br /> were collected in Summa canisters over a period of approximately 22 to 24 hours. <br /> Analytical results for the crawl space sample were reported with total petroleum <br /> hydrocarbons as gasoline (TPH-g) at 680 micrograms per cubic meter (Ng/m3), benzene at <br /> 0.53 ug/m3, and ethylbenzene at 1.2 pg/m3, all above the Environmental Screening Levels <br /> (ESLs) of 10 Ng/m3, 0.084 pg/m3, and 0.98 Ng/m3, respectively. Toluene was detected at <br /> low concentrations in all three air samples and xylene was detected at low concentrations in <br /> the crawl space sample. Based on these results, AGE proposes to collect duplicate air <br /> samples in the crawl space beneath the residency and analyze these samples and an air <br /> sample field blank to evaluate the accuracy and precision of the original crawl space <br /> analytical results. If the confirmation crawl space air samples are detected with high <br /> concentrations of contaminants of concern, then AGE proposes to collect an indoor air <br /> sample at the residency. <br /> During a telephone conversation between AGE and the EHD on 19 August 2011, AGE <br /> proposed entering the highest concentrations detected from the previous and proposed <br /> crawl space sampling events into RISC V software to assess the human health cancer risk. <br />