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Vicki McCartney [EH] <br /> From: William Little[wlittle@advgeoenv.com] <br /> Sent: Wednesday, March 06, 2013 2:57 PM <br /> To: Nuel Henderson [EH]; Vicki McCartney[EH] <br /> Cc: rmarty@advgeoenv.com <br /> Subject: FW: GEO_REPORT Submittal#9194721996 : T0607700898 Has Been Denied <br /> Mr. Nuel Henderson: <br /> AGE prepared a model for soil vapor intrusion risk at the Lodi Airport site, <br /> 23987 HWY 99, ACAMPO, CA. <br /> Our results were very close the minimal cancer risk of 10-6. Text below provides a primer <br /> to a risk evaluation discussion our client would now like to pursue with your office. <br /> The small concentration of benzene in one soil vapor sample represents one area of the <br /> building on the site. A less conservative approach would be the reduction of the model <br /> input for benzene, by 50 % based on the reduction or lack of petroleum on the remaining <br /> sides of the structure. <br /> RISK DISCUSSION <br /> For carcinogens, the human health screening levels presented are based on a target excess <br /> cancer risk of 10-6. This represents the upper end (most <br /> stringent) of the potentially acceptable range of 10-4 to 10-6 recommended by the USEPA <br /> (USEPA 1989a,b) . As stated in the National Contingency Plan, however, "The 10-6 level <br /> shall be used as the point of departure for determining remediation goals. . . " (USEPA <br /> 1994) . Remediation or risk management is rarely warranted at sites where the estimated <br /> cancer risk does not exceed 10-6. Remediation or risk management is almost always. <br /> warranted at sites where the estimated cancer risk exceeds 10-4. For sites where the <br /> estimated risk is between 10-4 and 10-6, the need for active remediation or risk <br /> management is evaluated on a site-specific basis (i.e. , risks within this range are <br /> "potentially acceptable", depending on site-specific considerations) . <br /> Please re-evaluted your offices denial of the report of findings. <br /> Sincerely, <br /> William R. Little <br /> California Professional Geologist 7473 <br /> Oregon Registered Geologist G2254 <br /> Washington Licensed Geologist 2778 <br /> Advanced GeoEnvironmental Inc. www.advgeoenv.com Stockton . Santa Rosa . Monterey . Brea . <br /> Spokane . Reno . Dallas (800) 511-9300 <br /> This email/fax message is for the sole use of the intended recipient (s) and may contain <br /> confidential and privileged information. Any unauthorized review, use, disclosure or <br /> distribution of this email/fax is prohibited. If you are not the intended recipient, <br /> please contact the sender by email/fax and destroy all paper and electronic copies of the <br /> original message. <br /> -----Original Message----- <br /> From: Darcy Austin [mailto:admin@advgeoenv.com] <br /> Sent: Monday, February 25, 2013 11:45 AM <br /> To: Bill <br /> Subject: FW: GEO_REPORT Submittal #9194721996 : T0607700898 Has Been Denied <br /> -----Original Message----- <br /> From: vmccartney@sjcehd.com [mailto:vmccartney@sjcehd.com] <br /> Sent: Monday, February 25, 2013 11:34 AM <br /> To: admin@advgeoenv.com <br /> Subject: GEO_REPORT Submittal #9194721996 : T0607700898 Has Been Denied <br /> *** THIS EMAIL WAS AUTOMATICALLY GENERATED BECAUSE ONE OF YOUR SUBMITTALS <br /> 1 <br />