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Page 1 of 1 <br /> Vicki McCartney [EH] <br /> From: William Little [wlittle@advgeoenv.com] <br /> Sent: Monday, October 15, 2012 1:56 PM <br /> To: Vicki McCartney [EH]; Nuel Henderson [EH] <br /> Subject: 308 Grant Street- Remediation <br /> Attachments: Larrys Auto- Updated Remediation Cross Section C-C' Figure 3 10-2012.pdf <br /> Ms. Vicki McCartney and Mr. Nuel Henderson: <br /> AGE has modified the proposed well screen interval for the proposed air-sparge well <br /> network for the sidewalk on Miner Avenue. Shallow wells are to be installed and two <br /> semi-shallow wells to sixty feet, representing the top of the well screen are proposed. <br /> Attached cross section depicts the wells. <br /> A pilot test of the wells at the base of hydrogeologic unit 1 or sixty feet with total depth <br /> sixty-five feet, will be conducted to evaluate the dissolved oxygen concentrations <br /> change in shallow wells near each sparge point (sve wells, MW-5 and MW-6). Each <br /> sparge well will be operated for five days at low flow operation (2-4 scfm with <br /> approximately 10-12 psi pressure) and monitoring will be conducted daily to evaluate <br /> the change in dissolved oxygen. <br /> The deeper well operation will be evaluated against the conclusion of the two mini-pilot <br /> tests to determine if air can be collected from a depth of six feet below surface grade. <br /> Following the test, full scale Soil vapor extraction and shallow air-sparging will <br /> commence. <br /> Thank you in advance for your help in this matter. Please call me if you have any <br /> questions. <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.advoeoenv.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 <br /> contact the sender by email/fax and destroy all paper and electronic copies of the original message. <br /> 10/16/2012 <br />