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Page 1 of 1 <br /> ..r <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Monday, August 22, 2011 4:14 PM <br /> To: 'Jim Barton' <br /> Cc: Nuel Henderson [EH] <br /> Subject: Follow up to our telephone conversation concerning crawl space air samples <br /> Hi Jim, <br /> After talking to you on Friday, August 19th, Nuel Henderson and I talked to Brian Millman of Advanced <br /> GeoEnviron mental, Inc. (AGE), concerning the results for air samples collected from the crawl space beneath the <br /> home at 104 Beverly Place in Tracy. Brian explained that air samples collected from a crawl space are equivalent <br /> to air samples collected from indoor air; therefore, Brian is proposing that air samples collected from the crawl <br /> space be inputted into Risk 5 software to assess the human health cancer risk. Brian supported his proposal by <br /> mentioning that the Johnson and Ettinger Model is intended to use for structures with a slab foundation. <br /> (The home at 104 Beverly Place does not have a concrete slab foundation.) Also, unlike the Johnson and <br /> Ettinger Model, the Risk 5 software does not use attenuation factors. Brian said that he ran the model using the <br /> current crawl space data and the results were below the cancer risk of 1 in a million. Brian is proposing that AGE <br /> collect duplicate crawl space air samples and include an air sample field blank; and using the highest analytical <br /> concentrations from the two crawl space sampling events, assess the health risk. Nuel and I concur with Brian's <br /> recommendations. <br /> If results from this investigation indicate that there is little health risk, then venting the crawl space area may not <br /> be necessary. <br /> Brian also said that the pilot study for RegenOx injections is on hold until he can get additional funding from the <br /> Cleanup Fund. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton,California 95202 <br /> Phone: (209)468-9852 <br /> Fax: (209)468-3433 <br /> Email: vmccartney_ Acehd.com <br /> 8/22/2011 <br />