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• A di a , i f, 6'H 24 October 2008 AGE-NC Project No. 95-0106 NOV 0 6 2008 ENVIRONMENT HEALTH Ms. Vickie McCartney PERMIT/SERVICES San Joaquin County Environmental Health Department 600 East Main Street Stockton, California zea1b , � Subject: Soil Vapor Survey Work Plan Addendum - October 2008 WELDON CHURCH PROPERTY 104 West Beverly Place, Tracy, California Dear Ms. McCartney: At the request of Mr. Weldon Church, Advanced GeoEnvironmental, Inc. (AGE) prepared the enclosed Soil Vapor Survey Work Plan Addendum - October 2008 for 104 West Beverly Place, Tracy, California. The location of the site and surrounding area are illustrated on Figure 1; site structures and monitoring well locations are illustrated on Figure 2. This addendum proposes to modify the scope of work presented in the AGE-prepared Soil Vapor Survey Work Plan, dated 25 April 2007, and Soil Vapor Survey Work Plan -Addendum, dated 09 July 2007. By letter dated 25 July 2007, the San Joaquin County Environmental Health Department (EHD) approved the above referenced AGE-prepared Soil Vapor Survey Work Plan-Addendum. The scope of work included advancement of ten soil borings for collection and analysis of soil and soil-vapor samples; the objective of the proposed scope was to determine the lateral extent of petroleum hydrocarbon-impacted soil present beneath the site,and to assess the threat of vapor intrusion to the house located near the source area. On 07 April 2008,AGE advanced two soil borings(B25 and B26; shown on Figure 2)as part of the proposed scope of work. During soil boring activities, it was determined that several of the borings were proposed in areas located in close proximity to underground utilities.Alternative advancement procedures are required to complete the scope of work. AGE proposes to make the following modifications to the original work plans: • Relocation of soil vapor borings, located east and south of the site residence, to locations adjacent to the residence (Figure 2); • Advancement of proposed soil vapor borings utilizing a hand auger due to close proximity of the residence and underground utilities;