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Page 1 of 3 <br /> VW ... <br /> Vicki McCartney [EH] <br /> From: William Little[wlittle@advgeoenv.com] <br /> Sent: Wednesday, February 29, 2012 3:08 PM <br /> To: Vicki McCartney [EH] <br /> Cc: Nuel Henderson [EH] <br /> Subject: RE: 308 Grant Street <br /> Attachments: Larry's Auto Soil TABLES 1.pdf <br /> Vicki McCartney, <br /> Evaluating the soil impact in boring MW8 would include a soil vapor intrusion model. The soil <br /> vapor intrusion models and risk assessment for TPH only produce a hazard index and the <br /> other VOCs can provide a cancer risk value. In other word the first value which produces a <br /> cancer risk above any threshold would be soil sample data from below 25 feet in depth. Site <br /> information, particularly with non-impacted soil sample data at five feet and low concentrations <br /> of only TPH at a depth of ten feet, <br /> does not justify additional soil vapor sampling. <br /> Otherwise the next best investigation tool for soil vapor intrusion is a shallow soil vapor <br /> sample-point, however, with no impact at five feet in soil samples, the likelihood of soil vapor <br /> impact is low. Overall the risk of hydrocarbon vapor intrusion is low and even with the available <br /> soil data, an exposure model (vapor model) would not produce any results which could be <br /> detrimental. <br /> �lvuGdic(`f�I,t y`n Z,a�a, <br /> Your office can issue a directive for a soil vapor sampling near the southern UST area and <br /> AGE will prepare work plan for the RP to install some point near the UST or building. <br /> Please call me if you have any questions. <br /> Sincerely, <br /> William R. Little <br /> California Professional Geologist <br /> Advanced GeoEnvironmental Inc. www.advcieoenv.com <br /> Stockton • Santa Rosa • Monterey • Brea •Spokane• Reno• Dallas <br /> (800)511-9300 <br /> This email/fax message is for the sole use of the intended recipient(s)and may contain confidential and privileged information.Any <br /> unauthorized review, use,disclosure or distribution of this email/fax is prohibited. If you are not the intended recipient,please contact the <br /> sender by email/fax and destroy all paper and electronic copies of the original message. <br /> From: Vicki McCartney [EH] [mailto:vmccartney@sjcehd.com] <br /> Sent: Tuesday, February 28, 2012 3:52 PM <br /> To: wlittle@advgeoenv.com <br /> Subject: RE: 308 Grant Street <br /> Bill, _. <br /> Thank you for providing the hard copy laboratory analytical data for influent and <br /> Larry's Auto on 9/15/11 and 12/08/11. <br /> 2/29/2012 <br />