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Sierra-Pacific Groundwater Consultants, Inc. <br /> = 4911 Windplay Drive, Suite 4 <br /> El Dorado Hills, CA 95762 <br /> (916) 933 - 1468 <br /> MEMORANDUM <br /> TO: Nick Nickerson, Unocal DBG/AMG <br /> FROM: Eric Chase <br /> DATE: March 4, 1998 V <br /> SUBJECT: Notes from Meeting with OEHHA Personnel, March 4, 1998 <br /> Risk Assessment Work Plan, former PureGro/Brea Facility, Stockton, CA <br /> Attendees: For OEHHA - Dr. Julio Salinas, Ms. Karen Randles; for Unocal - Jim Gentry, Nick <br /> Nickerson; for Sierra-Pacific - Eric Chase, John Rapp; and Dr. Lee Shull, Mr. Mark Jones, <br /> consulting toxicologists <br /> Nick Nickerson presented Unocal's past experience with DTSC/HERD on other sites, and stated the <br /> intended goals of this meeting. Nick stressed that the Broadway Avenue site in Stockton in one of two,with <br /> the second site (Modesto)being somewhat more complex than Broadway Ave. Therefore, the agreements <br /> reached in this meeting would set a precedent for the other site as well. Nick stated that the goal of this <br /> meeting was to firm up OEHHA's preferred approach to risk assessment, with the intention of taking this <br /> information into an upcoming meeting with RWQCB. <br /> Next, Eric Chase presented a brief overview of the site, its setting,past site uses, and past investigations. <br /> Next the consultants asked a series of questions of OEHAA, answered primarily by Dr. Salinas, as follows: <br /> 1. Does OEHHA have a preferred risk assessment work plan structure? <br /> Dr. Salinas said that they have no specific preferred structure, due to the uniqueness of each <br /> site, compounds of concern, ground water conditions, etc. He also stressed that OEHHA is <br /> not a regulatory agency, but acts in an advisory capacity under a contractual agreement with <br /> RWQCB and other agencies. RWQCB is the"risk manager" for this site. <br /> 2. If a compound is present at very low levels (e.g. a few parts per billion) and is only present <br /> infrequently in soil or ground water testing,does Julio want it considered in risk assessment, <br /> or is the elimination of such compounds appropriate prior to performing the risk assessment <br /> (i.e. does OEHHA agree with exclusion of certain chemicals in the risk assessment as not <br /> qualifying as chemicals of concern)? <br />