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i 0 <br /> California Regional Water Quality Control Board <br /> 4410 Central Valley Region <br /> Katherine Hart,Chair <br /> 11020 Sun Center Drive-4200.Rancho Cordova,California 95670-6114 <br /> hex Rodriquez (916)464-3291 •VAX(916)464-4645 Edmund G.Rrown.lr. <br /> h1alid hupJ/\vwwwgv <br /> . aterboards ca Gg„ ne,. o, <br /> She” for <br /> Ro - <br /> ExA,n mmmental Proleclion <br /> 9 December 2011 <br /> Duane White, <br /> California Department of Toxic Substances Control <br /> 8800 Cal Center Drive <br /> Sacramento, CA 95826-3200 <br /> REVISED LIMITED SUBSURFACE INVESTIGATION WORK PLAN, PG&E FORMER <br /> MANUFACTURED GAS PLANT SITE, STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Water Board) have <br /> reviewed the November 2011 Revised Limited Subsurface Investigation Work Plan, Stockton, <br /> California (Revised Work Plan). The Revised Work Plan was prepared in response to <br /> comments provided by Regional Water Board staff and Department of Toxic Substance <br /> Control staff in a 30 September 2011 letter and 18 October 2011 conference call. <br /> PG&E adequately addresses all Regional Water Board concerns in the Response to <br /> Comments provided with the Revised Work Plan. However, the Revised Work Plan contains <br /> several discrepancies that should be clarified: <br /> 1. The Response to Comments and Table 2 correctly identifies proposed monitoring well <br /> MW-33 as a Zone A well. However, Figure 3 shows MW-33 as a B Zone well. Figure 3 <br /> should be corrected to avoid confusion. <br /> 2. Page 10, Section 3.6 Monitoring Well Construction, states that there will be two wells <br /> installed in Zone A and four wells installed in Zone B. Because MW-33 was changed <br /> from a Zone B well to a Zone A well, Section 3.6 should be changed to reflect that three <br /> wells, MW-28, MW-29 and MW-33 will be constructed in Zone A and MW-30, MW-31 <br /> and MW-32 will be constructed in Zone B. <br /> Regional Water Board staff concur with the Revised Work Plan on the condition that the above <br /> changes are addressed. If there are any questions or comments regarding this letter, I can be <br /> contacted at 916-464-4677 or by email at gdjuth@waterboards.ca.gov. <br /> (Original Signed By) <br /> Gerald Djuth, P.E., C.E.G <br /> Private Site Cleanup Unit <br /> cc: Patricia Sullivan, PG&E, San Ramon <br /> Jennifer Wagler, Arcadis, U.S., Inc., Walnut Creek <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />