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U <br /> 'EOr CAI IFORNIA.GU=DRNIA ENVIRONMCNIAL PROTEC I'tONAGENCY PETE WILSON.0 M':V <br /> %TE WATER RESOURCES CONTROL BOARD I� <br /> R.BONDERSON BUCnWG [/ <br /> P Si FFFT 'j • <br /> .BOX 100 <br /> -RALENIO,CALIFORNIA DS812-0100 <br /> 6) 657-0941 <br /> .6) 657-0932 (FAX) { <br /> a•. �o <br /> All Regional Water Board Chairpersons DEC - 3 tssS a i <br /> Al Regional Water Board Rxccutive. OrGczrs { <br /> .411 LOP A;ency Directors <br /> LAWRENCE LIVERMORF, NATIONAL LABOILATORY (LT,NL) REPORT ON LEAKING <br /> UNDERGROUND STORAGE TANK (UST) gLFANUP ! <br /> In Octohcr 1995, the LLNI_ presented to the State Water Resources Control Board (SWRCB) its final <br /> report, Recommendations to Improve the Clcnn p Pmccss for California's T.caking Undererhund Fuel <br /> nks. The LLNL team found that the impacts 10 tLe environment from leaking USTs were not as ! ` <br /> severe as we once thought. The report also presenLq a convincing argument that passive 1 <br /> biorcmcdiation should be considered as the Primary remediation tool in most cases once thc.ifuel leak <br /> source has ben removed. <br /> The LLNL report has also been presented to the SWRCH's Sia 1764 Advisory Committee which wile!, { <br /> in turn, provide recommendations to the SWRCB by the end of January 1996. The SWRCB may <br /> choose to implement recornmendations from the I.T.NL report and the SB 1764 Advisory Committee <br /> through revisions to SWRCB Resolution 92-49 in early 1996. <br /> i IIn the interim and in light of the findings and recommendations in the-LLNL report, we believe <br /> cleanup oversight agencies should proceed aggressively to close low risk soil utdy cases. For cases, <br /> effecting low.risk groundwater(for instance, shallow• groundwater with maximum depth to,watcr less <br /> than 50 feet and no drinking water wells scrccned in the shallow groundwater zone within 250 feet of <br /> the leak) we recommend that active remediation lx: tclilaced with monitoring to determine if the fuel <br /> leak plume is stable_. Obviously good judgment is required in all of these decisions. Tlowcver, that <br /> judgment should now include knowledge provided by the II.NL report. <br /> What ] propose.to you is not in any way inconsistent with existing policies or regulations i However, <br /> it does represent a maior departure from how.we hevc viewed the threat from leaking USTs. Th1s <br /> gttidancc is consistent with the resulis of a discussion of this,subject among the Siate Board Chau and <br /> Regional Board Chaos on December 5; 1995. ..if you have any questions on this matter please call <br /> Mr. James Giannopoulos, our manager of the undcrgiolind storage tank program."at (9]6):227-4320. <br /> Sincerely, <br /> Walt Pettit f <br /> Executive Director - { <br /> r : All Regional Water Board/L.OI' UST Program Managers <br />