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I-Ae <br /> Vicki McCartney [EH] <br /> From: Jim Barton obarton@waterboards.ca.gov] <br /> Sent: Tuesday, August 23, 2011 6:14 AM <br /> To: Vicki McCartney[EH] <br /> Cc: Nuel Henderson [EH] <br /> Subject: Re: Follow up to our telephone conversation concerning crawl space air samples <br /> OK Vicki, <br /> as long as the results show acceptable risk levels (cancer and non-cancer) , I concur to <br /> the plan. <br /> Jim Barton <br /> James L.L. Barton, P.G. <br /> Engineering Geologist <br /> California Regional Water Quality Control Board Central Valley Region, 11020 Sun Center <br /> Drive, Suite 200, Rancho Cordova, CA 95670 office (916) 464-4615 <br /> fax (916) 464-4704 <br /> >>> "Vicki McCartney [EH] " <vmccartney@sjcehd.com> 8/22/2011 4 :13 PM >>> <br /> Hi Jim, <br /> After talking to you on Friday, August 19th, Nuel Henderson and I talked to Brian Millman <br /> of Advanced GeoEnvironmental, Inc. (AGE) , concerning the results for air samples collected <br /> from the crawl space beneath the home at 104 Beverly Place in Tracy. Brian explained that <br /> air samples collected from a crawl space are equivalent to air samples collected from <br /> indoor air; therefore, Brian is proposing that air samples collected from the crawl space <br /> be inputted into Risk 5 software to assess the human health cancer risk. Brian supported <br /> his proposal by mentioning that the Johnson and Ettinger Model is intended to use for <br /> structures with a slab foundation. (The home at 104 Beverly Place does not have a <br /> concrete slab foundation. ) Also, unlike the Johnson and Ettinger Model, the Risk 5 <br /> software does not use attenuation factors. <br /> Brian said that he ran the model using the current crawl space data and the results were <br /> below the cancer risk of 1 in a million. Brian is proposing that AGE collect duplicate <br /> crawl space air samples and include an air sample field blank; and using the highest <br /> analytical concentrations from the two crawl space sampling events, assess the health <br /> risk. Nuel and I concur with Brian's recommendations. <br /> If results from this investigation indicate that there is little health risk, then venting <br /> the crawl space area may not be necessary. <br /> Brian also said that the pilot study for Regenox injections is on hold until he can get <br /> additional funding from the 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@sjcehd.com <mailto:vmccartney@sjcehd.com> <br /> 1 <br />