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DRAFT REQUEST FOR NO FURTHER ACTION AT&T,MICROWAVE RELAY FACILITY 90 WEST TURNER ROAD,LODI, CALIFORNIA ` ATC PROJECT NO. 53.75128.0001 July 14, 2002 1.0 INTRODUCTION The purpose of this report is to request that a letter of"no further action"be issued by the California Regional Water Quality Control Board — Central Valley Region (Regional Board) for the former UST at the AT&T, microwave relay facility located at 90 West Turner Road, Lodi, California (Figure 1). AT&T authorized ATC Associates Inc. (ATC) to prepare this request by Work Order No. 0251293 dated May 27, 2002. 2.0 BACKGROUND The site is owned by AT&T and is a decommissioned microwave telecommunications relay facility. A site vicinity map and a site location map are presented in Figures 1 and 2, respectively. One building exists near the center of the site with a microwave tower located to the north of the building. The site is accessed by a gravel road along the east side of the building. One 15,000- gallon diesel fuel underground storage tank (UST) was formerly located adjacent to the northeast corner of the building. The age of the UST was unknown. L A UST removal investigation by ATC is described in a report entitled, "Report of Findings — Underground Storage Tank Removal, AT&T Microwave Relay Facility," dated July 16, 1999. t The UST and its associated piping were removed by AT&T on March 4, 1999. A UST excavation and sampling map is presented in Figure 3. The UST and/or the piping system associated with the UST appeared to have released petroleum hydrocarbon product into the soil on site. Stained and odorous soil was observed in soil samples collected from the base of the UST excavation. The UST excavation area soil had a maximum detected concentration of total petroleum hydrocarbons — diesel fuel (TPH-D) at the south end of the UST over-excavation at 4,900 milligrams per kilogram (mg/kg) at a depth of 16 feet below ground surface (bgs), the maximum depth of the excavation. Elevated TPH-D concentrations were also found in soil at the L. west and southwest ends of the excavation. Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and methyl tert butyl ether (MTBE) were not detected in the UST excavation area soil. ATC Associates Inc I project No.53.75128.0001 L.