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Additional Site Assessment Work Plan - Monitoring Well Installation LOPEZPROPERTY 1601 Turnpike Road, Stockton, California 1.0. INTRODUCTION At the request of Ms. Mable Keir and with the approval of an EHD letter dated 23 March 2007 (provided in Appendix A), Advanced GeoEnvironmental, Inc (AGE) has prepared this work plan for installation of deep ground water monitoring wells to vertically define the petroleum release at 1601 Turnpike Road, Stockton, California(site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan is prepared in accordance with EHD and Central Valley Regional Water Quality Control Board(CVRWQCB) guidelines for the investigation of underground storage tanks (UST) sites. This work plan provides a description of the scope of work and procedures for the installation of two additional deep ground water monitoring wells screened from 60 feet to 65 feet to determine whether commingling is occurring with the 60 to 65 feet 1,2-DCA contamination plume detected at the adjacent property(1607 Turnpike Road)to the southwest of the site.AGE proposes one deeper monitoring well screened from 110 feet to 120 feet bsg in the former UST area, in order to define/monitor the vertical extent of petroleum hydrocarbon impacted ground water. Stratigraphic information from the 1607 Turnpike Road investigation demonstrates a permeable sand unit at a the of 110 feet to 120 feet bsg at the site, therefore based on the significant petroleum hydrocarbon impact to ground water at 65 feet,the target depth for the vertical well has been proposed. A Background information is summarized in Appendix Y. Previous ground water monitoring well installations(MW-I through MW-4)are documented in AGE's Quarterly Report-4"Quarter 2004, dated 20 January 2005, and were conducted according to the Revised Work Plan, Monitoring Well Installation dated 16 August 2004, prepared by Kleinfelder Incorporated. The installation of monitoring wells MW-5 through MW-8 is documented in the AGE prepared Monitoring Well Installation Report, dated 25 January 2007. 2.0. SCOPE OF WORK The lateral and vertical extent of hydrocarbon-impacted ground water has not been defined at the site. AGE proposes the following scope of work to further delineate the impacted ground water: • Permitting and pre-field work activities; • Pilot soil boring and sample collection; • Monitoring well installation and development; • Ground water sample collection; • Preparation of a report of findings. Advanced GcoEnvironmental,Inc.