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GRANITE CONSTRUCTION 2038SS7632 06124102 01:03pm P. 009 li�.__._--_..--.—.------...._----- K L F J N F E l D F R Polynuclear Aromatic Hydrocarbons (PAI-Is) Four PAHs from the semi-volatile organic analyses (EPA 8270) were detected in a single composite sample. A summary of the concentrations are shown on Table 2 found in the appendix of this report. A summary of the four PAHs concentrations are illustrated below with including Industrial PRGs PAHs Analytes Concentration m /k Industrial PRG(mg/kg) Benzo a anthracene 0.15 2.9 Benzo a ene 0.15 0.29* Chrysene 0.11 290 Fluoranthene 0.17 30,000 "Cal-Modified PRG"(PEA 1994) As noted above the concentrations for each of these compounds area below PRGs for industrial use. According to the "Handbook of Environmental Data on Organic Chemicals, Second Edition", these chemical have similar sources including crude oil, coal tar, emissions from gasoline engines, asphalt, cigarette smoke, sewage etc. In general these are relatively heavy and found in a variety of compounds. These type of PAHs generally have low solubility. Corrosivity The composite stockpile samples was also analyzed for eorrosivity. Corrosivity is measured using pH. The pH values ranged from 7.89 to 7.96 units which is slightly alkaline. However in Kleinfelder's experience these values are not uncommon of many soils in the valley. 5.0 RECOMMENDATIONS Based upon the analytical results presented in this report, it appears the stockpiled material is suitable for industrial use or to be disposed of in an appropriate landfill. If the material is to be moved offsite, the findings within this report should be made available to the recipient of the material and approval obtained from PHS/EHD. Offsite residential use of this material is not recommended. Kleinfelder recommends forwarding this report to PHS/EHD for their review and comment. This report, and the conclusions and recommendations presented in this report are subject to the "Limitations" presented below. Any other party other than regulatory agencies having enforcement jurisdiction for this site) who would like to use this report shall notify Kleinfelder, Inc. of such intended use by executing the "Application for Authorization to Use" contained in Attachment C. 20-1108-33.001/2011 R 1188 Page 5 of 7 October l7;2001 ®2001,Kleinfelder,Inc.