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Page 2 of 3 <br /> Subject: RE: 308 Grant Street - Remediation <br /> Bill, <br /> I have been under the impression that AGE will be submitting a work plan addendum relating what you are <br /> proposing in your 15 October 2012 email. I need to know when AGE plans to submit the addendum. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Phone: (209)468-9852 <br /> Email: vmccartnev )sicehd.com <br /> From: William Little [mailto: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 /> Ms. Vicki McCartney and Mr. Nuel Henderson: <br /> AGE has modified the proposed well screen interval for the proposed air-sparge <br /> well network for the sidewalk on Miner Avenue. Shallow wells are to be installed <br /> and two semi-shallow wells to sixty feet, representing the top of the well screen are <br /> proposed. 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 <br /> depth sixty-five feet, will be conducted to evaluate the dissolved oxygen <br /> concentrations change in shallow wells near each sparge point (sve wells, MW-5 <br /> and MW-6). Each sparge well will be operated for five days at low flow operation (2- <br /> 4 scfm with approximately 10-12 psi pressure) and monitoring will be conducted <br /> daily to evaluate the change in dissolved oxygen. <br /> The deeper well operation will be evaluated against the conclusion of the two mini- <br /> pilot tests to determine if air can be collected from a depth of six feet below surface <br /> 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.advgeoenv.com <br /> 11/5/2012 <br />