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STATE OF CALIFORNIA—ENVIRONMENTAL PROTEA GENCY • PETE WILSON.Governor <br /> DEPARTMENT OF TOXIC SUBSTANCES CONTROL <br /> 10151 CROYDON WAY.SUITE 3 -� <br /> SACRAMENTO.CA 95827-2106 3 <br /> (916) 855-7700c <br /> ,r <br /> February 11 , 19925f '. <br /> ` fE8 J c , <br /> Mr. Robert Doss P.E. !JAR/HJT`` ,3 1992 <br /> J(�r <br /> S �� �! <br /> Project Manager ER✓�r£� <br /> Pacific Gas & Electric Company <br /> Environmental Services <br /> 77 Beale Street, Room F-1636 <br /> San Francisco, California 94106 <br /> Dear Mr. Doss: <br /> PG&E - STOCKTON, REMEDIAL INVESTIGATION/FEASIBILITY STUDY (RI/FS) <br /> WORKPLAN <br /> The Department of Toxic Substances Control (Department) has <br /> reviewed your response to our comment and contingent approval <br /> letter issued November 25, 1991 for the RI/FS workplan. Your <br /> January 3 , 1992 amendment to the RI/FS workplan fails to provide <br /> sufficient information to justify that the proposed sampling plan <br /> for Area II will be adequate to characterize the soil. Please <br /> provide sufficient background information to indicate the <br /> appropriate depths and locations that should be sampled to <br /> adequately characterize the soil. Based on the additional <br /> background information, and on the results of the soil samples <br /> already taken, an additional round of investigation may be <br /> required for Area II. Additionally, the proposed project <br /> schedule should include an evaluation period for treatability <br /> studies prior to evaluating remedial action alternatives and <br /> should also include a submittal date and review period for the <br /> Baseline Risk Assessment. <br /> Please address the above comments within fifteen (15) days <br /> from receipt of this letter. Submittal of the above information <br /> will satisfy all contingencies applied to the November 25, 1991 <br /> RI/FS approval letter. If you have any questions, please contact <br /> Mr. Fernando Amador at (916) 855-7892. <br /> Sincerely, <br /> James L. Tjosvold, Chief <br /> Sacramento Responsible Party Unit <br /> Site Mitigation Branch <br /> Region 1 <br /> cc: See next page. <br />