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STATE OF CALIFORNIA-Environmental Protection Agency PETE WILSON, Govemor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 Routier Road,Sufte A --- <br /> Sacramento,CA 95827-3098 8 <br /> PHONE:(916)255-3000 <br /> FAX:(916)255-3015 <br /> arun <br /> 14 December 1995 <br /> Mr. Fernando Amador <br /> Department of Toxic Substances Control <br /> 10151 Croydon Way, Suite 3 <br /> Sacramento, CA 95827-2106 <br /> COMMENTS ON THE DRAFT SOIL OPERABLE UNIT FEASIBILITY STUDY, PG&E <br /> FORMER MANUFACTURED GAS PLANT, STOCKTON, SAN JOAQUIN COUNTY <br /> I have reviewed the November 1995 Draft Soil Operable Unit Feasibility Study for PG&E's former <br /> manufactured gas plant in Stockton. My comments are presented below. <br /> General Comments <br /> 1. The site maps using air photos should be replaced with regular computer aided drawing (CAD) <br /> maps. The air photos are appropriate when identifying former structures which could be <br /> potential sources of contamination. Once these structures have been identified, a CAD map with <br /> a convenient scale and incorporating these structures should be used. For example, Figure 2-5 <br /> which is a CAD, is much easier to look at than Figure 4-5. Figure 2-5 provides the essential <br /> information which is described in the text while Figure 4-5 has extraneous components which <br /> really do not add value to the information being presented but in fact blurs the picture because of <br /> shadows and different shades of gray. Labeling the essential components also presents a <br /> problem because of the varying shades of light and dark. <br /> 2. References to directions in the Specific Comments assume that north is towards the top of the <br /> page. <br /> Specific Comments <br /> 1. Pages 2-2 and 2-3, Sections 2.1.3 and 2.1.4, Geology and Hydrogeology <br /> The FS should include the geologic and hydrogeologic cross-sections which provide a graphic <br /> representation of the subsurface conditions. The cross-sections should include data from the <br /> additional soil investigation conducted this past summer. <br /> 2. Page 2-13, Section 2.2.2, Former MGP Facilities <br /> The second to the last sentence of the section describes former aboveground oil tanks. The <br /> locations of these tanks are not shown on Figure 2-3. <br />