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1 <br /> 1.0 INTRODUCTION <br />' This site closure report was prepared by Environmental Science & Engmeering, Inc (FSE) for <br /> the AT&T Communications (AT&T) Microwave Station(site) located at 110 West Turner Road, <br /> Lodi, San Joaquin County, California (see Figure 1 - Location Map) <br /> The report summarizes fundings of soil and ground water investigations associated with residual <br /> petroleum hydrocarbons (diesel fuel) in the vadose and saturated zones near four former <br />' underground storage tanks (USTs) at the site This work was performed by ESE between 1990 <br /> and 1994 The report was prepared at the request of the San Joaquin County Department of <br /> Environmental Health (County) and follows the Central Valley Regional Water Quality Control <br />' Board (Regional Board) guidelines for a closure report (CVRWQCB, 1994) <br /> 1,1 Site Description <br /> The subject site is locted approximately 112 mile west of Lodi, on Turner Road (Figure 1) The <br /> site is bordered on the south and west by vineyards To the north lies the Mainland Nursery <br />' East of the site is an access road The Woodbridge Canal, an unlined canal of the Mokelumne <br /> River Aqueduct carrying water south from Lodi, lies east of the access road (Figure 2 -Site <br /> Plan) <br /> The site is an AT&T microwave relay station, fuel for emergency power generator fuel was <br /> formerly stored in four 18,000-gallon underground tanks Following removal of the old tanks <br />' in 1987, they were replaced with one 10,000 gallon double-walled underground tank <br /> Other structures on site are the main building and microwave relay tower The building houses <br />' the relay station components and the power plant (diesel engine) The relay tower contains <br /> receptor and transmitter antennae Other site features include storage buildings and two <br /> industrial-use wells (Figure 2) A septic tank is located Just south of the site property (see <br /> Appendix A - Well Permit Requests) <br />' 1.2 Background Environmental Conditions <br /> Four underground diesel fuel storage tanks on site were removed in February 1987 by Beaver <br />' Construction of Downeyville, California under the supervision of Sacramento Equipment <br /> Maintenance (SEM) During routine tank removal sampling, detectable levels of diesel fuel <br /> were found in the soil Klemfelder and Associates (Klemfelder)performed soil sampling during <br />' over-excavation within the former tank area Klemfelder's report of the sampling activities show <br /> the location of soil samples within the excavation (Plate 1) to verify removal of soil with diesel <br /> Laboratory analyses of verification soil samples SS-03, SS-04, SS-06, and SS-07 showed non- <br /> detectable levels of Total Petroleum Hydrocarbons (TPH) and benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX) Approximately 400 cubic yards of soil were removed from the tank area <br /> and stockpiled on site The stockpiled soil was sampled on May 14, 1987 after excavation <br />' activities and analyzed for TPH <br />' F 16935186LCLOSURE RFr 1 Environmental Science&Engtncenng,Inc <br />