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Advaiwed <br /> GeoEnvironmental, Inc . <br /> 16 April 2003 <br /> AGE-NC Project No. 02-0946 <br /> Mr. Harlan Knoll ZOO' <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95201 <br /> Subject: Monitoring Well Installation Work Plan Addendum <br /> Proposed El Dorado Apartments Development <br /> 2450 South El Dorado Street, Stockton, California <br /> Dear Mr. Knoll: <br /> As discussed during our telephone conversation on 16 April 2003,Advanced GeoEnvironmentai,Inc. <br /> (AGE) has prepared this addendum to Monitoring Well Installation Work Plan, dated 17 January <br /> 2003, for advancing one soil boring at the proposed El Dorado Apartments Development located at <br /> 2450 South El Dorado Street, Stockton, California. AGE originally proposed advancing one soil <br /> boring near the former UST area utilizing a truck-mounted drill rig equipped with hollow-stem <br /> augers. However, due to conditions at the site, AGE is proposing to advance the boring utilizing a <br /> GeoProbe"direct-push"probing unit equipped with 1.25-inch probing rods.The Geoprobe advances <br /> soil probe borings using a hydraulic or pneumatic hammer to drive soil sampling tools to specified <br /> depths. <br /> The soil boring will be permanently sealed to prevent vertical migration of potential contaminants <br /> and shall be abandoned by backfilling with a portland cement slurry from the total depth to surface <br /> grade. The EHD will be notified for grout inspection at least 72 hours prior to conducting grouting <br /> procedures. <br /> Sincerely, <br /> Advanced GeoEnvironmentai, Inc. <br /> Paul B. Dotson <br /> Staff Geologist <br />