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, 4 <br /> h <br /> 28 February 1997 <br /> AGE-NC Project No 95-0144 <br /> Page 3 of 20 ` <br /> !'a 7 <br /> s i <br /> Stockton or Cal Water are located within 2,000 feet of the site The nearest municipal well located <br /> down-gradient from the site is approximately 2,400 feet northeast of the site on East Poplar Street, <br /> between San Joaquin Street and Hunter StreetFirst encountered ground water is not used for <br /> drinking or irrigation <br /> 3.0: ASSESSMENT OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER <br /> � J t <br /> ' Four soil probe borings(probings GP5 to GP8)were installed near the former location of UST No 1, <br /> a 250-gallon waste oil tank Petroleum hydrocarbons were detected in a soil sample collected from <br /> a depth of 15 feet bsg directly below the former UST location Petroleum hydrocarbons were not <br /> detected at depths of 20 and 25 feet bsg below the former UST No 1 nor in samples collected from <br /> ' three probings approximately 15 feet from the former UST location Hydrocarbons were not detected T <br /> in a grab groundwater sample collected from beneath the UST location We estimate a volume of <br /> approximately 200 cubic yards of impacted soil in the vicinity of UST No I <br /> r Four probings (GPI to GP4) weic in tailed near,the former location of LJST No 8, a 1 000-gallon <br /> trichloroethane (TCA) solvent taiik�Petroleum hydrocarbons were not detected in soil samples <br /> collected from these probings'(However, strong solvent-like odor was noted during sample <br /> collection, extending to the bottom of probings GPI and GP2 Hydrocarbons were rot detected in <br /> `Fa grab ground water sample collected from below the former UST,location We estimate a volume <br /> of approximately 750 cubic yards of impacted soil in the vicinity of UST No 8 <br /> ` r <br /> Four probings (GP9 to GP12) were installed near the former location of UST No 2, a-1,000-gallon k <br /> ' waste oil tank Analytical results and field observations indicated that soil and water in the vicinity <br /> of UST No 2 were not adversely effected by the operation of the UST Details of the soil probing <br /> investigation were desciibed in the Quaff tel ly Report-June 1995 prepared by AGE i <br /> , <br /> From 1990 to 1994, five ground water monitoring wells (MW-1, MW-2, MW-4, MW-5 and MW-8) <br /> and two'soil borings (SB-1 and S13-2) were installed near the former location of USTs No 3, 4, 5 <br /> & 6 Hydrocarbons were encountered in both soil and ground water samples collected near the <br /> former USTs location Details were presented in a March 1991 Progi ess Report and August 1994 <br /> ' Summary Report/Additional Site Investigation prepared by Resna Industries <br /> In June and July 1995, five probings were advanced near the former location of USTs No 3 through <br /> ' 6, defining the limits of impacted soil and ground water Monitoring wells MW-1 I, MW-12 and <br /> MW-13 were installed at the site in September 1995 Monitoring well MW-18 was installed <br /> immediately east of the site in Madison Street in November 1995 Details were described in <br /> Quarterly, Reports dated June and December 1995 prepared by AGE <br /> P <br />