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1117 Lone Palm Ave,Suite 201 <br /> Modesto,CA 95351 <br /> Phone:209-579-2221 <br /> (NATCFax: 209-579-2225 <br /> January 9, 2009 <br /> 54.22493.0001 i <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Subject: feasibility Study Addendum for the Eggiman Property, 1112 East Harding Way, <br /> Stockton, California <br /> Dear Ms. Duncan: <br /> Per your letter dated September 24, 2008, ATC Associates Inc. has prepared an addendum to » ; <br /> our Feasibility Study, dated September 12, 2008 for the subject site (Figures 1 and 2). The <br /> attached report summarizes items " requested in your correspondence and includes <br /> recommendations for the site. , y,. <br /> The following paragraphs include a limited description of the different remedial technologies <br /> evaluated in the Feasibility Study. A cost estimate for implementing each technology is - <br /> presented. ATC also presents supplemental information for the remedial alternative previously <br /> selected followed by a final conclusion and recommendation. <br /> REMEDIAL ALTERNATIVES <br /> Soil Remediation Alternatives <br /> Natural Attenuation.and Groundwater Monitoring(NA) <br /> The natural attenuation and groundwater monitoring alternative would require no additional <br /> remediation equipment in the short term. The primary costs associated with this approach would <br /> be labor and analytical costs of periodic monitoring of the existing groundwater wells. Additional <br /> costs could be incurred for permitting, installing and monitoring additional groundwater wells to <br /> follow the plume, and/or advancing confirmation soil borings to ensure degradation is occurring. <br /> The cost of this alternative is estimated to be $120,000 to$200,000. <br /> Enhanced Natural Attenuation <br /> The enhanced natural attenuation option effectively shares costs with the groundwater extraction o <br /> with biological treatment option presented for groundwater remediation, and requires no additional <br /> remediation equipment in the short term. The primary costs associated with this approach would <br /> be labor and analytical costs of quarterly monitoring of the existing groundwater wells. Additional <br /> s:\environmental\22493\reports\feasibility.doc 1 <br />