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5) Results of laboratory analysis of groundwater samples from MW-1 indicate Benzene at <br /> 1100 parts per billion (ppb) The Maximum Contaminant Level for Benzene in drinking <br /> water is 1 ppb The cleanup level for Benzene under the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB) basin plan is background When the lateral extent <br /> of the groundwater plume has been defined, remediation of the groundwater plume may <br /> begin <br /> PHS/EHD recommends installation of 2 additional monitoring wells to determine gradient and <br /> the extent of the groundwater plume Soil data from the monitoring wells may provide <br /> additional data to define the extent of soil contamination from 36 feet to groundwater <br /> In order to remain in compliance with Article 11 of the Caltfonua Code of Regulations (CCR <br /> Article 11), the corrective action regulations, a workplan for the installation of two additional <br /> monitoring wells shall be submitted to PHS/EHD by March 30, 1995 Quarterly monitoring of <br /> the monitoring wells shall continue until the site receives closure status Failure to remain in <br /> compliance with CCR Article 11 may jeopardize the status of your reimbursement <br /> For further information please contact Steven Sasson at (209) 468-3459 <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Steven Sasson, Senior REHS Diane M Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> cc Elizabeth Thayer, CVRWQCB <br /> f� Barbara Andersen, SWRCB <br /> V cc Bill Hunter, W 3 Hunter and Associates <br />