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1.0 INTRODUCTION <br /> On behalf of the San Joaquin County Facilities Management Department (property owner and <br /> responsible party), Ramage Environmental, Inc. has prepared this Monitoring Well Destruction <br /> and Final Groundwater Monitoring Report for submittal to the San Joaquin County <br /> Environmental Health Division (EHD) and the Central Valley Regional Water Quality Control <br /> Board (RWQCB). <br /> On September 11, 2008, San Joaquin Count EHD recommended closure of the case, and <br /> q Y <br /> requested RWQCB concurrence. On September 26, 2008, RWQCB concurred with EHD's <br /> 1„ recommendation to close the case, pending destruction of the monitoring wells and disposal of <br /> any remaining waste materials. Copies of the regulatory correspondence are included in <br /> Appendix A. <br /> On August 29, 2008, Ramage Environmental submitted to EHD, Letter Work Plan, Destruction <br /> of Groundwater Monitoring Wells. On September 30, 2008, EHD approved the work plan with <br /> comments. A copy of the workplan approval letter is included in Appendix A. <br /> �1 . <br /> Lr" <br /> 1.1 Site Description <br /> The Agricultural Commissioner's Office site is located at 503 East 10'h Street in the city of Tracy <br /> (San Joaquin County), California {f=igure 1). The property is an active county office building. <br /> The site is bordered to the north by Hamilton Alley, a city of Tracy right-of-way, and to the east <br /> by a transmission repair shop on private property (Figure 2). The site is flat and mostly paved. <br /> �} Three, 1,000-gallon capacity, underground storage tanks (UST) existed in the northeast part of <br /> the site_ The northernmost and southernmost USTs (Tanks 1 and 3) were used to store weed <br /> oil (i.e., high-sulfur diesel fuel). The center UST was used to store unleaded gasoline. <br /> 1.2 Previous Work <br /> .1.2.1 UST S stem Removal <br /> On October 28, 1988, the three 1,000-gallon capacity, USTs an&associated product piping and <br /> dispenser island equipment were removed from the site.by Tilford & Hall. During UST removal, <br /> HD inspector noted the presence of holes in both weed oil USTs and "extensive <br /> the E p <br /> contamination" within the limits of the excavation. <br /> 4 <br />