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1.0 INTRODUCTION <br /> On behalf of the County of San Joaquin (property owner), Ramage Environmental has prepared <br /> this Groundwater Monitoring Report, Third Quarter 2002 for submittal to the San Joaquin County <br /> Public Health Services Environmental Health Division (PHSIEHD) and the Central Valley Regional <br /> Water Quality Control Board (RWQCB) The scope of work was completed according to Ramage <br /> Environmental's Letter Work Plan, Monitoring Well Installation and Groundwater Sampling dated <br /> July 16, 2001 On July 18, 2001, PHSIEHD approved the work plan <br /> 17 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 Stribley Park, approximately 600 feet north of the fueling <br /> system The locations of this well and the former and existing USTs are shown on Figure 2 <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 Total Petroleum Hydrocarbons (TPH)-as-gasoline, and benzene, toluene, ethylbenzene and <br /> xylenes (BTEX) The soil sample locations are shown on Figure 2 <br /> rDuring November 1998, the county public works department replaced USTs#1 and #2 with <br /> upgraded systems Advanced GeoEnviron mental collected soil samples from beneath the USTs <br /> and underground product piping (Figure 2) <br /> 3 <br />