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KLEINFELDER FILE NO. 20-3978-01.WR6 FEBRUARY 24, 1997 For the inhalation pathways, volatilization factors and particulate emission factors are used to estimate exposure due to emissions from soil to air. For the dermal absorption pathway, a 10% skin absorption factor was used to calculate the PRGs for the constituents of concern at the Spreckels site. This factor assumes the dermal dose is equal to an adult's ingestion dose. If contaminant concentrations at the subject site exceed the estimated PRG values and the exposure pathways used to calculate those PRGs are inappropriate for the site, additional site evaluations, such as an evaluation of background levels, supplementary sampling and calculations using site-specific data may be necessary. The industrial soil PRGs were evaluated for DDT, DDE, 2,4'-D, Lead and 2,4-DB for the Spreckels site. �� 'ancentrafi�nitinge.l7 #ertecl' 'S 'r 414'-DDE ND to 1,500 µg/kg 5.6 mg/kg (5,600 µg/kg) 4,4'-DDT ND to 2,700 µg/kg 5.6 mg/kg(5,600 µg/kg) 2,4'-D ND to 260 gg/kg 6,800 mg/kg (6,800,000 µg/kg) Lead (California only) ND to 88 mg/kg 1,000 mg/kg 2,4-DB ND to 240 µg/kg 5,500 mg/kg (5,500 ltg/kg) The PRG exposure pathways used for soil are appropriate for the Spreckels site and the PRG values are from two times to orders of magnitude higher than the reported contaminant levels in the surface soils. Therefore, it appears that additional evaluations or remedial action will not be necessary in these areas of the Spreckels site. 6.2.4 Recommendations Kleinfelder does not recommend any further investigation or clean-up of the railroad spur locations. This does however exclude the apparently isolated area of high soluble lead. Kleinfelder recommends that this area of soluble lead concentrations which exceed the STLC- Regulated Level should be excavated and properly disposed of to improve property marketability. Confirmation soil samples using STLC-Lead analysis should be obtained to verify the adequacy of excavation (<5 µg/kg). However, Kleinfelder recommends that a copy of this report be submitted to the RWQCB and PHS/EHD for their review and comment. Additionally, Kleinfelder recommends that a letter of"no further action" be requested from both agencies. A copy of this report should be submitted to the San Joaquin County Public Health Services Department (PHS/EHD) and the Regional Water Quality Control Board (RWQCB) for their consideration. Additionally, Kleinfelder recommends that a letter of "no further action" be requested from both agencies. This report is subject to the."Limitations" found in Chapter 7 of this report. 10-3978.0i.WR6/107RE074 Page 15 of 17 01997, Kleinfelder, Inc.