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0 <br /> Advanced <br /> GeoEnvironmental, Inc . <br /> 11 September 2006 <br /> AGE-NC Project No. 01-0839 <br /> SEP 12 2006 <br /> Ms. Lori Duncan E('YIV' "'"r"'r I IPACTH <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, 3`d Floor <br /> Stockton, California 95202 <br /> Subject: Request to Modify Field Work Schedule <br /> ERNIE'S GENERAL STORE <br /> 4407 East Waterloo Road, Stockton, California <br /> Dear Ms. Duncan: <br /> In a letter dated 16 August 2006,the San Joaquin County Environmental Health Department(EHD) <br /> approved the Additional Site Assessment and Soil Vapor Extraction Pilot Test Work Plan Addendum, <br /> prepared by Advanced GeoEnvironmental, Inc. (AGE) and dated 07 August 2006. The proposed <br /> scope of work included advancement of two cone penetrometer testing(CPT) borings, installation <br /> of one ground water monitoring well east of the McDonald's property,installation of six on-site soil <br /> vapor extraction(SVE)wells, and performance of two separate SVE pilot tests. <br /> On 06 September 2006, AGE met with Mr. Ernest Giannecchini to discuss the proposed scope of <br /> work. Mr. Giannecchini would like to delay initiation of field work until after the analytical results <br /> for the fourth quarter 2006 ground water monitoring event are received,to better evaluate possible <br /> contaminant trends at the site. Therefore, AGE would like to propose a modified schedule for the <br /> field work: <br /> • 17 October 2006: Performance of the fourth quarter 2006 ground water monitoring and <br /> sampling event. <br /> • November 2006: Advancement of CPT soil borings. <br /> • November- December 2006: Installation of the off-site ground water monitoring well and <br /> SVE wells and performance of two separate SVE pilot tests. <br /> • January: Submittal of a report of findings to the EHD. <br /> 837 Shaw Road, Stockton. California 95215 <br /> Telephone(209)467-1006 Fax(209)467-1118 <br />