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Work Plan Addendum PREM DOR 433 Scotts Avenue, Stockton,California 1.0. INTRODUCTION At the request of Dr. Sonya F. Olbrantz of Masonite International/PremDor, Advanced GeoEnvironmental,Inc.(AGE)has prepared this work plan addendum for 433 West Scotts Avenue, Stockton,California(site).The revised scope of work includes the advancement of two soil borings two ground water monitoring wells and one paired,cone penetrometer test boring for the collection of soil and ground water samples.The location of the site is illustrated on Figure 1.A plan of the site is illustrated on Figure 2. Additional site background information is provided in Appendix A. The San Joaquin County Environmental Health Department (EHD) has directed by letter dated 10 March 2005 that revisions be considered for the AGE prepared Additional Site Assessment Work Plan and Site Conceptual Model, Dated 15 February 2005 (AGE, February 2005) and that a work plan addendum be prepared. (Appendix B). This work plan has been prepared in accordance with Central Valley Regional Water Quality Control Board (RWQCB) guidelines for the investigation of underground storage tanks (UST) sites. AGE concurs with the EHD's recommendation for the proposed soil brings to be advanced to a total depth of 35 feet bsg (as opposed to 30 feet bsg) as there were small concentrations of select hydrocarbon compounds detected in the 35-foot soil samples collected from soil borings MW2,B1 and B2. AGE concurs with the EHD's recommendation to complete the soil bring proposed south of MW-3 on Lincoln Street as a single completion ground water monitoring well. AGE concurs with the EHD's recommendation to complete the soil bring proposed east-northeast of MW-2 on-site,as a single completion ground water monitoringwell and move the location further away from the former UST location. Based on soil and grab ground water sample information from soil borings B5 and B6 provided in the Alta Em, Inc. -prepared Site Assessment Report, dated 22 June 2004 (Alta Em, June 2005) for the adjacent site at 375 W. Hazelton Avenue, Stockton California(Appendix C), the vertical and lateral extents of petroleum hydrocarbon-impacted soil and ground water at the northeastern portion of the PremDor site are defined(Figure 2). Soil bring B5 was drilled to 23 feet bsg and soil bring B6 was drilled to a total depth of 20.5 feet bsg,soil samples a grab ground water sample were collected at each location.Hydrocarbon compounds were not detected in the soil samples analyzed from each boring or from the ground water sample collected from B5. Small amounts of toluene,ethylbenzene and xylenex were detected in the ground water sample collected from B6,but all concentrations were below State of California Department of Health Services (DHS) Maximum Containment Levels (MCL) for drinking water. Advanced GeoEnvironmental,Inc.