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Page 3 of 3 <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 GeoEnviron mental Inc. www.advcleoenv.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 <br /> information.Any unauthorized review, use,disclosure or distribution of this email/fax is prohibited. If you are not the intended <br /> recipient,please contact the sender by email/fax and destroy all paper and e*Womc copies of the original message. <br /> 11/26/2012 <br />