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REPORT OF FINDINGS <br /> QUARTERLY GROUNDWATER MONITORING REPORT NO. 3 <br /> APRIL 2001 —JUNE 2001 <br /> AT&T, MICROWAVE RELAY FACILITY <br /> 90 WEST TURNER ROAD, LODI, CALIFORNIA <br /> ATC PROJECT NO. 75.75128.0001 <br /> OCTOBER 4, 2001 <br /> i <br /> 1.0 INTRODUCTION <br /> i The purpose of this report is to document activities related to quarterly sampling of three groundwater monitoring <br /> wells at the AT&T microwave relay facility located at 90 West Turner Road, Lodi, Cahknua (Figure 1) <br /> AT&T authorized ATC Associates Inc (ATC)to perform quarterly groundwater monitoring by Work Order No <br /> 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 One <br /> building exists near the center of the site with a microwave tower located to the north of the building The site is <br /> accessed by a gravel road along the east side of the building One 15,000-gallon diesel fuel underground storage <br />' tank(UST)was located adjacent to the northeast corner of the building The age of the UST was unknown <br /> The UST was removed by ATC on March 4, 1999 The UST and/or the piping system associated with the <br /> UST appeared to have released petroleum hydrocarbon product into the soil on site Stained and odorous <br /> soil was observed in soil samples collected from the base of the UST excavation The UST excavation area <br /> soil had a maximum detected concentration of total petroleum hydrocarbons — diesel fuel (TPH-D) at the <br /> south end of the UST at 4,900 milligrams per Mer(mg/L) at a depth of 16 feet below ground surface(bgs), <br /> the maximum depth of the excavation Elevated TPH-D concentrations were also found in soil at the west <br /> and southwest ends of the excavation Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and <br />' methyl tert butyl ether(MTBE)were not detected in the UST excavation area soil <br /> Following removal of the UST, approximately 371 tons of diesel fuel-impacted soil were removed from the <br /> site and disposed at the BFI Landfill located in Livermore, California on March 23, 1999 The UST <br />' 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 impacted <br /> soil appears to be confined to the innmednate vicinity of the former UST excavation an an area <br /> approximately 25 feet long by 25 feet wide Analytical results of groundwater samples from that <br /> investigation indicate that diesel fuel in the groundwater migrated from the former UST excavation to the <br /> south and east The diesel fuel impacted groundwater appeared to be laterally confined to an area <br /> • approximately 60 feet long by 35 feet wide Diesel fuel was found in groundwater at a maximum reported <br /> concentration of 150 micrograms per liter (ug/L) adjacent to the UST excavation, and decreased to a <br /> t <br />