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M f Interim Remediation Feasibility Testing and Well Installation Work Plan - Addendum QUICK N SAVE #1 1901 South El Dorado Street, Stockton, California 1.0. INTRODUCTION In addition to the scope of work approved in the San Joaquin County Environmental Health Department (EHD) letter dated 26 May 2005 , Advanced GeoEnvironmental, Inc. (AGE) has prepared this work plan addendum for the installation of one ground water extraction well at 1901 South El j Dorado Street, Stockton, California (the site). Following the well installation, AGE will perform a 1 feasibility pilot study for ground water corrective action including performance of a 24-hour ground I water aquifer pump test. The location of the site is illustrated in Figure 1 . A plan of the site is illustrated on Figure 2. Site background information was included in the AGE prepared Interim Remediation Feasibility Testing and Well Installation Work Plan dated 15 June 2005 . This work plan addendum has been prepared as required by an EHD letter, dated 26 May 2005, and is in accordance with Appendix A - Reports Tri-Regional Recommendations For Preliminary Investigation and Evaluation of Underground Tank Site, dated 16 April 2004, prepared by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tanks (UST) sites. 2.0. GROUND WATER DEPTH AND FLOW DIRECTION The estimated depth to ground water at the site is approximately 31 feet below surface grade (bsg) based on information from quarterly monitoring events performed at the site. However, ground water at the site is confined by a thick fine grained material and was encountered in previous borings at approximately 45 feet bsg. Based on data collected during the 2004 ground water monitoring events, fast observed ground water was approximately 29 to 33 feet bsg, the ground water flow direction was inferred to be towards the east to southeast at calculated gradients of 0.016 to 0.005 foot per foot. 3.0. SCOPE OF WORK The proposed scope of work will consist of the following tasks: • Permitting and pre-field work preparations; • Drilling and soil sample collection; • Installation and development of a ground water extraction well; Advanced GeoEnvironmental, Inc.