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STATE OF CALIFORNIA—ENVIRONMENTAL PROTE*AGENCY PETE WILSON,Governor <br /> DEPARTMENT OF TOXIC SUBSTANCES CONTROL <br /> 10151 CROYDON WAY,SUITE 3 <br /> SACRAMENTO,CA 95827-2106 <br /> (916) 255-3545 January 12, 1993 <br /> r .,a <br /> JAN 13 1393 <br /> Mr. Abel W. Haines, P.E. , Director FNVIR0Nfvi-PiAI. HEAL-TPI <br /> Environmental Protection Office PERM1! /,,rj -i <br /> Building 231, Tracy Location <br /> Defense Distribution Region West <br /> P.O. Box 960001 <br /> Stockton, California 95296-0250 <br /> REVIEW OF THE DRAFT FINAL FEASIBILITY STUDY (FS) AND PROPOSED <br /> PLAN (PP) FOR OPERABLE UNIT NO. 1, DEFENSE DISTRIBUTION REGION <br /> WEST (DDRW) , TRACY <br /> Dear Mr. Haines: <br /> The Department of Toxic Substances Control (Department) has <br /> reviewed the above referenced documents. We have also <br /> participated in a tele-conference (November 19 , 1992) to resolve <br /> outstanding regulatory concerns regarding both documents. <br /> The Department's understanding of agreements reached during <br /> the November 19, 1992 , tele-conference are as follows: <br /> 1. The aquifer cleanup levels for TCE and PCE will both be set <br /> at 5 ug/l. This is consistent with the present State and <br /> Federal cleanup standards. However, DDRW Tracy will develop <br /> FS language which will allow a flexible approach in setting <br /> aquifer cleanup levels. Such language will allow compliance <br /> with requirements of both the Department and the California <br /> Regional Water Quality Control Board (RWQCB) that could <br /> potentially drive the cleanup levels lower at a future date. <br /> The specific standards that the FS language will be tied to <br /> are the maximum contaminant levels (MCL) enforced by the <br /> Department and the State Water Resources Control Board's <br /> (SWRCB) Resolutions, Nos. 68-16 and 92-49 and Chapter 15, <br /> Title 23 of the California Code of Regulations. <br /> The FS language is necessary with respect to the MCLS for <br /> TCE and PCE as new lower numbers are being evaluated. Those <br /> numbers are 2 .5 ug/l for TCE and 0.7 ug/l for PCE. The FS <br /> language will also state that the above regulations, adopted <br /> by the SWRCB and enforced by the RWCQB, are ARARs which <br /> require cleanup to background, if it is technically and <br /> economically feasible. The technical and economic <br /> feasibility of lowering the aquifer cleanup levels to <br /> background will be evaluated during the 5 year review <br /> process. <br />