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Mr. C.Dean Hubbard--RWQCB <br /> May 15,2007 <br /> Page 2 of 2 <br /> • SAIC reviewed potential non-crude oil sources that could explain the elevated <br /> concentrations of TPHg. The Kinder Morgan Energy Partners (KM)pipeline and the Bay <br /> Area Products Line(BAPL), which both convey refined petroleum products, are in the <br /> vicinity of sampling locations MH 1-19 and MH 1-24. However, although elevated TPHg <br /> were found at MH1-19 and MH 1-24, non-detectable or low benzene,toluene, <br /> ethylbenzene, and total xylenes(BTEX) concentrations in soil and groundwater were <br /> reported. BTEX are significant constituents of the refined petroleum products <br /> transmitted in the KM pipeline and the BAPL, and are minor constituents of crude oil <br /> rarely detected at OVP or TAOC sites. The absence of BTEX suggests that the KM <br /> pipeline and the BAPL are not sources of affected soil and groundwater at the site. <br /> • Based on the absence of non-crude oil sources, proximity of the OVP and TAOC <br /> pipelines to the affected area, high TPHc levels in soil,chromatogram patterns consistent <br /> with TPHc, and overlapping carbon ranges of the test methods,crude oil is probably the <br /> petroleum product represented by TPHg and TPHd levels in groundwater samples. <br /> A copy of an email containing Lancaster's and ETC's comments is enclosed. <br /> In the ERE report, SAIC recommended that a plan be developed in the event that affected soil or <br /> groundwater is encountered during future site construction activities. A Soil and Groundwater <br /> Management Plan will be submitted to the RWQCB by July 31, 2007, for your review. <br /> If you have questions, please call Jeff White at(510)466-7178 or Mike Hurd at(510) 466-7161. <br /> Sincerely <br /> SCIENCE APPLICATIONS INTERNATIONAL CORPORATION <br /> (4. <br /> Jeffr to Michael Hurd, CHG 0068 <br /> Senior Project Manager Senior Project Manager " ,'' <br /> 3 <br /> Enclosures: <br /> Email documentation q�g <br /> ' > _-- •. <br /> cc: Michael Jenkins–SAIC ti'�-t`�' <br /> 6 c. <br /> M. Scott Mansholt CEMC <br /> Michael Infurna–San Joaquin County Environmental Health Department, Stockton <br />