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1 <br /> • 1.0 INTRODUCTION <br /> 1 <br /> On behalf of the County of San Joaquin (property owner), Ramage Environmental has prepared <br />' this Monitonng Well Installation and Groundwater Monitoring Report for submittal to the San <br /> Joaquin County Environmental Health Division (EHD) and the Central Valley Regional Water <br /> Quality Control Board (RWQCB) The scope of work was completed according to Ramage <br /> Environmental's Site Conceptual Model and Work Plan, Additional Site Investigation and <br /> Remedial Feasibility Testing, dated March 7, 2003 On July 14, 2003, EHD approved the work <br /> plan A copy of the work plan approval document is included in Appendix A <br /> 1 1 Site Location and Description <br /> The subject property is located at 1810 East Hazelton Avenue in the city of Stockton, California <br /> (Figure 1) The site is an active county motor pool and office complex with a gasoline and diesel <br /> fueling system Currently, the fueling system consists of one gasoline underground storage tank <br /> (UST#1), one diesel tank (UST#2), and two dispenser islands Additionally, four former tanks <br /> (USTs#3, 4, 6, and 7)were removed, and one former tank (UST#8) was abandoned in place <br /> The former and current fueling systems are shown on Figure 2 A municipal irrigation well is <br /> located in Stnbley Park, approximately 600 feet north of the fueling system (Figure 3) <br /> 1.2 Previous Work Summary <br /> Prior to 1979, two of the tanks (USTs#6 and #7) were removed from the site <br /> 1 On June 15, 1995, Fisch Environmental removed a 12,000-gallon gasoline tank (UST#3) from the <br /> area immediately west of the dispenser islands, and collected soil samples for laboratory analysis <br /> from beneath the former UST On June 29, 1995, based on the sod sample results, Fisch <br /> Environmental over-excavated the tank basin to a depth of approximately 27 feet and collected <br /> additional soil samples The over-excavation soil samples also contained elevated concentrations <br /> of Total Petroleum Hydrocarbons (TPH)-as-gasoline, and benzene, toluene, ethylbenzene and <br /> xylenes (BTEX) The soil sample locations are shown on Figure 2, and the soil sample analytical <br /> results are summarized to Table 1 <br />' During November 1998, the county public works department replaced USTs #1 and #2 with <br /> upgraded systems Advanced GeoEnvironmental collected soil samples from beneath the USTs <br /> and underground product piping These soil sample locations are also shown on Figure 2, and <br /> the soil sample analytical results are summarized in Table 1 <br /> 5 <br />