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Advanced <br /> GeoEnvironmental , Inc . <br /> 17 November 2012 <br /> AGE-NC Project No. 95-0184 <br /> Ms. Vicki McCartney A10 1 <br /> Mr. Nuel Henderson <br /> San Joaquin County Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, CA 95205 <br /> Subject: In-Situ Air Sparging/Soil Vapor Extraction Remediation <br /> Work Plan Addendum <br /> LARRY'S AUTO REPAIR <br /> 308 North Grant Street, Stockton, California <br /> Dear Ms. McCartney: <br /> In accordance with your office's electronic mail request dated 02 November 2012 and at <br /> the request of Mr. Charles Skobrak, Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared an addendum to the remediation work plan dated 07 June 2012, for the site at <br /> 308 North Grant Street, Stockton, Californiaori Ud'Jd"' <br /> �WI°g►vti 5 <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 ' ty f tare to be installed; representing the top of the well screen —? <br /> are proposed. Attac d desii n section which depicts the proposed deep sparge wells. <br /> A pilot test of the wells at the base of hydrogeologic unit 1 oXsixty feet with total depth <br /> sixty-two feet, will be conducted to evaluate the dissolved oxyg oncentrations change s,rnu <br /> in shallow wells near each sparge point (sve wells, MW 5 and -6). Each sparge well �1�O Lis <br /> will be operated for five days at low flow operation (2-4 scfm with approximately 10-12 psi <br /> pressure) and monitoring will be conducted daily to evaluate the change in dissolved a�, ;ti & <br /> 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 sixty-feet below surface grade. <br /> Following the test,full scale Soil vapor extraction an�shallow air-sparging will commence. <br /> 837 Shaw Road • Stockton.CA 95215 <br /> Telephone(209)467-1006 • Fax(209)467-1118 <br />