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1 <br /> File No 20-3941-01 E 0 1 kn KLEI NFELDER <br /> August 20, 1996 <br /> in the samples analyzed from Boring B-15 Trace levels of some fuel constituents were <br /> present in the 2 and 25-foot samples from Boring B-13 A concentration of 220 mg/kg <br /> TPH-Lubricating Oil was detected in the 2-foot sample from Boring B-14 The <br /> concentrations of lubricating oil had attenuated to non-detectable levels by a depth of 5 <br /> feet Although Kleinfelder would recommend no further investigation or clean-up as a <br /> result of the chemical analysis conducted, the potential for contamination on this site still <br /> exists The City of Escalon must realize that Kleinfelder's scope of work was limited to <br /> CALTRANS District 10's requirements, and that the only method of detecting if <br /> contamination exists on site as a results of the station's activities will be observation and <br /> sampling during site demolition and during the removal of the tanks and plumbing <br /> Removal oI the underground storage tank system and dispensers will require permitting <br /> through PHS/EHD Additionally, a qualified hazardous materials contractor will be <br /> necessary for the excavation, removal, transportation, etc Soil sampling by a firm such <br /> ' as Kleintelder will be required under the permit <br /> 9 Borings B-16, B-17 and B-18 were advanced on the True Value Hardware site All three <br /> borings contained trace levels of TPH-Lubricating Oil or TPH-UEH Boring B-18 had a <br /> non-detectable sample beneath the sample that contained I 1 mg/kg TPH-UEH <br /> Kleinfeldei does not recommend any further investigation or clean-up as it relates to the <br /> concentrations noted in the sainples from these 3 borings <br /> 10 Borings B-19 and B-20 were advanced on the Wright's Petroleum property No <br /> ' contaminants were noted In the samples analyzed <br /> 1 1 Boring B-20 was advanced on the Franco's Restaurant property A concentration of 230 <br /> ' mg/kg TPH-Lubiicating Oil was detected in the sample obtained from a depth of 5 feet <br /> That concentration attenuated to non-detectable levels by a depth of 10 feet Boring B-20 <br /> was advanced on the Franco's Restaurant property A concentration of 230 mg/kg TPH- <br /> ' Lubricating Oil was detected in the sample obtained from a depth of 5 feet That <br /> concentration attenuated to non-detectable levels by a depth of 10 feet The source of the <br /> hydrocarbons is unknown However, the source may be old fill material that contained <br /> some oils Kleinfeldei would recommend no further investigation unless a source such as <br /> a former tank was known to have existed on site <br /> 12 Boring B-23 was advanced in the right-of-way in front of Pacoast Chemical No <br /> contaminants were detected in any of the samples analyzed from this boring <br /> ' 13 Borings B-22 and B-24 were advanced on the former Matt's Texaco site Field screening <br /> using the PTD indicated that significant concentrations were detected in both borings <br /> The highest PID readings were in the 15 foot to 30 foot zone in both borings especially <br /> in boring B-24 Soil samples obtained were screened in the field, and the PID readings <br /> were recorded on the boring logs PID readings ranged from 0 7 to 1,588 ppmv <br /> Hydrocarbon odors were present in almost all one-half of the soil samples obtained from <br /> these 2 borings <br /> ' 20-3941-01 E011MR960163 Page 18 of 21 ©1996 Kleinfelder Inc <br />