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9 0 <br /> Advanced <br /> GeoEnvironmental , Inc . - > <br /> 14 October 2010 <br /> AGE-NC Project No. 98-0533 <br /> Ms. Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California <br /> Subject: Soil Vapor Survey Work Plan Addendum <br /> LODI AIRPORT <br /> 23987 North Highway 99, Acampo, California 95220 <br /> Dear Ms. McCartney: <br /> Atthe requestof Mr. Robert Kupka,Advanced GeoEnvironmental, Inc. (AGE)prepared the <br /> enclosed Soil Vapor Survey Work Plan Addendum for 23987 North Highway 99, Acampo, <br /> California. The location of the site is illustrated on Figure 1, site structures and monitoring <br /> well locations are illustrated on Figure 2. <br /> By letter dated 07 May 2010, the San Joaquin County Environmental Health Department <br /> (EHD) directed the installation of three shallow soil vapor well or sampling points to <br /> continue sampling the soil vapor concentrations near the site building. The scope of work <br /> included advancement of four-inch diameter soil borings for well installation and soil vapor <br /> samples.The objective of the proposed scope is to assess the potential for vapor intrusion <br /> inside existing buildings located near the source area from hydrocarbon-impacted soil, <br /> released from the shallow product line release. <br /> AGE will advance three soil borings for installation of the previously proposed and <br /> approved soil vapor wells under procedures outline in the AGE prepared Soil Vapor Survey <br /> Work Plan, dated 11 July 2007 and Soil Vapor Survey Work Plan-Addendum, dated 24 <br /> November 2008. The EHD approved the work by letter dated 13 January 2009. <br /> Proposed temporary soil vapor points will be advanced to five feet bsg and single- <br /> completed utilizing%-inch diameter schedule 40 polyvinylchloride(PVC)0.010-inch slotted <br /> screen and blank casing. Each vapor point will be completed with a 0.5-foot length of <br /> screen attached to '/4-inch diameter tubing extending to near surface. After installation, a <br /> filter pack material consisting of pre-washed #2/12 sand will be added over the screen <br /> interval to approximately 0.5-feet above the screen interval. Remaining annular space will <br /> be sealed with Volclay bentonite from surface grade to approximately 4-feet bsg. The <br /> surface will be completed with a traffic rated well vault. Proposed temporary vapor point <br /> construction diagram is illustrated in Figure 3. <br /> 837 Shaw Road • Stockton,CA 95215 <br /> Telephone(209)467-1006 • Fax (209)467-1 1 I8 <br />