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10 INTRODUCTION <br /> On behalf of the County of San Joaquin (property owner), Ramage Environmental has prepared <br />' this Site Conceptual Model and Work Plan, Additional Site Investigation and Remedial Feasibility <br /> Testing for submittal to the San Joaquin County Environmental Health Division (EHD) and the <br /> Central Valley Regional Water Quality Control Board (RWQCB) This document also includes the <br />' results of groundwater monitoring, sampling and analysis for the Fourth Quarter of 2002 On <br /> November 12, 2002, EHD directed the submittal of this document <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 A <br /> municipal irrigation well is located in Stnbley Park, approximately 600 feet north of the fueling <br /> system The locations of the former and existing USTs and irrigation well are shown on Figures 2 <br /> and 3 As shown on Figure 3, the county motor pool and office complex is bordered to the south <br /> by the Atchison, Topeka, and Santa Fe Railroad right-of-way <br />' 12 Previous Work Summary <br />' Prior to 1979, two of the tanks (USTs #6 and #7) were removed from the site <br />' 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 soil 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 gasoline compounds The sod sample locations are shown on Figure 2, and the soil sample <br /> analytical results are summarized in 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 The soil sample locations are shown on Figure 2, and the sod <br /> sample analytical results are summarized in Table 1 <br />' 4 <br /> 1 <br />