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REPORT OF FINDINGS <br /> QUARTERLY GROUNDWATER MONITORING REPORT NO. 2 <br /> JANUARY 2001 —MARCH 2001 <br /> AT&T, MICROWAVE RELAY FACILITY <br /> 90 WEST TURNER ROAD, LODI, CALIFORNIA <br /> ATC PROJECT NO. 75.75125.0001 <br /> MAY 4, 2001 <br /> 1.0 INTRODUCTION <br /> The purpose of this report is to document the activities related to quarterly sampling of three <br /> groundwater momtonng wells at the AT&T, microwave relay facility located at 90 West Turner Road, <br /> Lodi, California (Figure 1) The quarterly groundwater monitonng contract was authorized by AT&T <br /> by Work Order No CA-8-PF2M6 dated August 30, 2000 <br /> 2.0 BACKGROUND <br /> The site is owned by AT&T and is a decommissioned microwave telecommunications relay facility <br /> One building exists near the center of the site with a microwave tower located to the north of the <br /> building The site is accessed by a gravel road along the east side of the building One 15,000-gallon <br /> diesel fuel UST was located adjacent to the northeast corner of the building The age of the UST was <br /> unknown <br /> The UST was removed by ATC on March 4, 1999 The UST and/or the piping system associated <br /> with the UST appeared to have released petroleum hydrocarbon product into the soil on site <br /> Stained and odorous soil was observed in soil samples collected from the base of the UST <br /> excavation The UST excavation area soil had a maximum detected concentration of total <br /> petroleum hydrocarbons -- diesel fuel (TPH-D) at the south end of the UST at 4,900 milligrams <br /> per liter (mg/L) at a depth of 16 feet bgs (the maximum depth of the excavation) Elevated TPH- <br />' D concentrations were also found at the west and southwest ends of the excavation Benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX) and methyl tert butyl ether (MTBE) were not <br /> detected in the UST excavation area soil <br /> Following removal of the UST, approximately 371 tons of diesel fuel-impacted soil were removed <br /> from the site and disposed at the BFI Landfill located in Livermore, California on March 23, <br /> 1999 The UST excavation was backfilled with clean soil imported to the site <br /> A soil boring investigation by ATC, described in a report dated April 6, 2000, found that diesel <br /> impacted soil appears to be confined to the immediate vicinity of the former UST excavation in an <br /> . area approximately 25 feet long by 25 feet wide Analytical results of groundwater samples from <br /> that investigation indicate that diesel fuel in the groundwater migrated from the former UST <br />