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1 <br /> 1 U INTRODUCTION <br /> On behalf of the County of San Joaquin (property owner), Ramage Environmental, Inc has <br /> prepared this Well Installation and Groundwater Monitonng Report, First Quarter 2005 for <br /> submittal to the San Joaquin County Environmental Health Division (SJCEHD) and the Central <br /> Valley Regional Water Quality Control Board (RWQCB) The scope of work was completed <br /> according to Ramage Environmental's Site Conceptual Model and Work Plan, Additional Site <br /> Investigation and Remedial Feasibility Testing, dated March 7, 2003 On July 14, 2003, SJCEHD <br /> approved the work plan The work plan approval 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 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 Based on the analytical results, Fisch Environmental over- <br /> excavated the tank basin to a depth of approximately 27 feet and collected additional soil <br /> samples These soil samples also contained elevated concentrations of Total Petroleum <br /> Hydrocarbons (TPH)-as-gasoline, and benzene, toluene, ethylbenzene and xylenes (BTEX) The <br /> soil sample locations are shown on Figure 2, and the 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 <br /> analytical results are summarized in Table 1 <br /> 4 <br />