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November 5,2001 <br />53636.001 <br />Mr. Peter Ingrain <br />City of Redwood City <br />Page 4 <br /> <br />information suggests that possible dischargers to the sewer include Roy's Cleaners, the former Davies <br />auto dealership, and other former or current businesses along ECR between Jefferson and James <br />Avenues. <br /> <br />August 2000 Meetlug with SFRWQCB <br /> <br />The purpose of the August 2000 meeting with SFRWQCB staff was to (1) present the findings of SCI's <br />February 2000 investigation; (2) discuss SFRWQCB's and the City's views on potentially responsible <br />parties with respect to the HVOCs in groundwater; and (3) propose a phased, risk-based, management <br />approach for proceeding with further steps to characterize the extent of the solvent plume, and evaluate <br />what remediation measures, if any, may be necessary. SFRWQCB staff agreed in concept with the <br />proposed approach and generalized scope of work discussed at the meeting, which included the <br />following initial steps: <br /> <br />(1). Further investigation activities to better define the subsurface stratigraphy and lateral/vertical extent <br /> of HVOCs, and <br /> <br />(2) Preliminary evaluation of potential migration pathways and sensitive receptors in order to begin to <br /> assess the potential human health and ecological risks posed by the HVOC plume. <br /> <br />APPROACH <br /> <br />As previously discussed with the City and SFRWQCB staff, Harding ESE proposes to group site <br />investigation activities into several phases of work, based on such factors as information needs and key <br />decisions points. Based on this approach, we have group proposed and/or anticipated tasks into three <br />phases, as summarized below. <br /> <br /> Phase 1 - Environmental Site Characterization <br /> <br /> Delineation of subsurface soil stratigraphy, <br /> <br /> · Evaluation of lateral and vertical distribution of HVOCs in groundwater, soil, and <br /> soil-gas, and <br /> <br /> · Identification of potentially complete pathways and sensitive receptors with respect <br /> to possible HVOC exposure. <br /> <br /> Project deliverables associated with this phase of work will include a Project Report prepared <br /> upon completion of the Phase 1 tasks. The project report will present a lateral and vertical <br /> characterization of site stratigraphy, and discuss the distribution of HVOCs in the subsurface. It <br /> will also recommend the locations and construction details of proposed groundwater monitoring <br /> wells, and a Site Conceptual Model for conducting future risk assessment activities. <br /> <br /> Harding ESE <br /> r A MACTEC <br /> <br /> <br />