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File No 20-3941-01 E01 kn ICLEINFELDER August 20, 1996 One possible explanation for the discrepancy between PID and the analyses is that the PID screens the soil sample for "vapor phase" contaminants, whereas, the chemical analyses performed screens the soil for hydrocarbon residues which are adsorbed onto the soil particles In Instances where vapor contamination exists and absorbed hydrocarbon contamination does not (e g , the edge of a volatile hydrocarbon contaminant plume) said conditions may occur High vapor phase contamination, with an isolated sample of high absorbed concentration at depth, may likely indicate the edge (horizontally) of the contaminant plume In this scenario, the high PID readings may be indicative of volatilization of the absorbed phase hydrocarbons within the granular soils 14 The equipment decontamination rinseate and drilling returns (soil) should be properly disposed of Kleinfelder can assist in that disposal at an additional charge if requested 15 Kleinfeider's services weie limited in scope Therefore, we recommend that asbestos/lead paint surveys be conducted prior to any building demolition Kleinfelder can supply the City of Escalon with a proposal for said services upon request 16 Because Kleinfelder's scope of services were limited in nature, the City of Escalon must realize that contamination may also exist in areas not investigated In the event that discolored soil, contaminant odors, or other environmental concerns are encountered during demolition or earthwoi k, our office should be notified immediately 17 A copy of this report should be submitted to the County of San Joaquin Public Health Services Department Environmental Health Division and the State of California Regional Water Quality Control Board by the City of Escalon for their review and consideration This report is subject to the limitations found in Chapter 7 of this report I 20-3941-01 E0IIMR960163 Page 4 of 21 01996 Kleinfelder Inc