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Page 2, �,�ir��, 1IULKI„i. 2/1 NMI MAY 15 1995 <br />• 2.0 INTRODUCTION ENVIRONMENTAL HEALTH <br /> PERMITISERVICES <br /> Upgradient Environmental Consultants (Upgradient) assumed the responsibility for asse,,sment and <br /> rnonitoring of giound%kater contamination at the Gillies I rUi king facility (GTC) in StOLkton, <br /> California in September, 1994 Upj�radient submitted Quarterly Reports in October 1904 and <br /> January 199 , d«c,r ibing, the progresti of the investigation through the lourth quarter of 1994 1 he <br /> purpose of this it-port is to prctiiiit ilii results of gruundwatLr monitoring, activitii,,, during the fiitit <br /> duartti of 1995 <br /> 3.0 13,kC KGROUND INF0RN1A 1 ION <br /> 3.1 Site Location and Desci iption <br /> The project site is located at 3961 Newton Road, in an industrial area on the northeast outskirts of <br /> Stockton near U S I lighwav 99 1 he location of the site is shown to 1�igurc I, and the site <br /> f'aailities are sho«n in I igure 2 Originally agricultural property, the site was developed as a <br /> commercial truck terminal in 1971 1 he property occupies an area of about 3 5 acres <br />. Topography in the area is generally flat, although the project site is elevated several feet above the <br /> adjacent parcels There is a maintenance building and office fronting Newton Road, with a large, <br /> unpaved storage vardlparking lot in the rear A diesel and gasoline fueling facility, consisting of <br /> two underground storage tanks (UST's), was formerly present on the east side of the storage yard <br /> (Figure 2) This facility was removed in 1989 and replaced with an above-ground fueling Facility, <br /> which is located to the south of the abandoned facility <br /> 3.2 Previous Work <br /> Soil samples collected during the UST removal in 1989 contained petroleum hydrocarbons in the: <br /> gasoline and diesel ranges, prompting assessment of the extent of soil contamination <br /> Contaminated soil was excavated to a depth of 35 feet by SEMCO in July, 1991, but residual <br /> hydrocarbons were detected in all eight soil samples collected from the floor and sidewalls of the <br /> excavation Approximately 1,500 cubic_yards of contaminated soil were excavated and stockpiled <br /> in the southern portion of the property The tank cavity was backfilled with clean soil obtained <br /> from the southern portion of the property The contaminated stockpiled soils were subsequently <br /> spread out to 50 cubic yard piles and allowed to aerate After approximately two years, San <br /> Joaquin EHD tested the contaminated piles and gave approval to spread the soil out and re-grade <br /> the southern part of the property <br />