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k" KLEINFELDER <br /> File No 20-3941-01 E01 <br /> August 20, 1996 <br /> 1 EXECUTIVE SUMMARY <br /> This is a report of Kleinfelder's limited subsurface investigation conducted on the Highway <br /> 120/McHenry Avenue Improvement Project in Escalon, California (see Plates I and 2) Mr <br /> Thom Clark of the City of Escalon retained Kleinfelder to conduct the assessment in accordance <br /> with our proposal dated April 16, 1996 <br /> Based on a review of files at the County of San Joaquin Public Health Services Department, <br /> Environmental Health Division (PHS/EHD), it appears that no regulatory closure was given for <br /> any of the thirteen sites investigated <br /> During our field work, Kleinfelder collected a total of ninety-eight (98) soil samples from <br /> twenty-four (24) soil borings None of Kleinfelder's borings were advanced to a depth greater <br /> r than 55 feet Groundwater likely exists at a depth of 65 to 70 feet, and therefore, was not <br /> encountered in any of our borings <br /> Sixty-two (62) of the ninety-eight (98) samples were analyzed Petroleum hydrocarbons were <br /> detected in 23 of the 62 soil samples analyzed The hydrocarbons noted in the soil samples <br /> analyzed can be generalized as follows <br /> 1 Boring B-I was advanced at the ARCO Station at 1305 Escalon Avenue The soil sample <br /> from a depth of 2 feet contained low levels of "lubricating oil" which may be <br /> representative of asphalt or asphalt leachate in the soil sample No detectable <br /> hydrocarbons were present in the sample obtained from 5 feet Kleinfelder recommends <br /> no further investigation or clean-up as a result of the hydrocarbons encountered in their <br /> borings <br /> 2 Boring B-2 was advanced near a trailer house at the northwest corner of Paul's Indian <br /> Store The soil sample obtained from a depth of 5 feet contained low to trace levels of <br /> Methyl Tertiary Butyl Ether (MTBE) and unidentified extractable hydrocarbons (UEH) <br /> MTBE is used almost exclusively in gasoline (see Appendix F) Therefore, these <br /> contaminants are likely due to surface spillage Kleinfelder recommends no further <br /> investigation or clean-up as a results of these trace levels <br /> 3 Boring B-3 was advanced near the southeast corner of the Escalon R-V parcel (north of the <br /> shop building) The sample obtained from a depth of 2 feet contained a trace level of <br /> UEH The UEH may be a results of asphalt or asphalt leachate Additionally, no <br /> detectable hydrocarbons were present in the sample obtained from a depth of 5 feet <br /> 20-3941-01 EOIIMR960163 Page I of 21 01996 Kleinfelder, Inc <br />