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�I <br /> Mr. Robert Doss, P.E. <br /> April 26, 1993 <br /> Page Three <br /> Agency or the Department's Hazardous Material Laboratory. <br /> These clean-up procedures should lower the detection limits <br /> to an acceptable range. <br /> 4 . Groundwater should be closely monitored at several wells <br /> which sporadically detected significantly elevated levels of <br /> nickel. These wells include MW-1, MW-3 , MW-7 , and MW-10., <br /> To complete the required characterization work, the <br /> Department recommends using a Hydropunch and/or installation of <br /> additional monitoring wells. The Department concurs with PG&E <br /> that sufficient data has been obtained from the investigation to <br /> proceed with preparation of the FS. The FS should be an <br /> interactive part of the cleanup process. A workplan for the <br /> additional characterization work required to satisfy the items <br /> listed above must be submitted within four weeks from the date of <br /> this letter. It may be beneficial for PG&E to meet with the <br /> Department before the workplan due date. <br /> If you have any questions, please call me at <br /> (916) 255-3737 . <br /> Sincerely, <br /> Fernando Amador <br /> Waste Management Engineer <br /> Site Mitigation Branch <br /> cc: Ms. Eileen Fanelli <br /> CH2M Hill <br /> 6425 Christie Avenue, Suite 500 <br /> Emeryville, California 94608 <br /> Ms. Eleanor Ratliff <br /> San Joaquin Public Health Department <br /> Environmental Health Division <br /> P. O. Box 2009 <br /> Stockton, California 95201 <br /> Mr. William Crooks <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827 <br />