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Shell Oil Products USA page 2 <br /> Station #204-7524-4, <br /> 3011 W. Ben Holt Drive, Stockton. <br /> EHD approves the proposal included in Cambria's "Work Plan Approval" <br /> correspondence as submitted and directs that the north and northeastern areas in <br /> the margins of the shallow impacted groundwater plume be assessed with <br /> additional monitoring wells and that the second significant sand interval be more <br /> fully assessed. EHD recommends installation of the second sand zone wells <br /> initially in the immediate areas of MW-1, MW-5, MW-2, MW-4, and MW-6. <br /> Please present the results of this and previous investigations in terms of a site <br /> conceptual model, which subsequently should be updated as new data is acquired. <br /> EHD will require Shell to modify current quarterly/annual monitoring procedures. All <br /> groundwater monitoring wells are to be sampled quarterly for TPHg, BTEX, and <br /> MtBE (analysis by EPA Method 8260 only). Additionally, samples from MW-1, MW- <br /> 2, and MW-5 are to be analyzed quarterly for methanol and ethanol, and TBA (EPA <br /> Method 8015m and 82608, respectively). <br /> EHD has received a well permit application and check (#1531) for two onsite <br /> monitoring wells. This application will be held until the offsite well permit <br /> applications, fees, and access agreements are received. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division S <br /> Michael J. Infurn r., Sen or REHS Nuel C. Henderson Jr. <br /> LOP / Site Mitigation Unit IV LOP Registered Geologist v <br /> MI/ <br /> c: CVRWQCB — Marty Hartzell, Sacramento. <br /> c: Cambria — Joe Neely, PO Box 259, Sonoma, CA., 95476. <br />