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RUSS CHAPIN 209-464-61947 01- "'^-96 14:40 P.02 <br /> h Al F Or Cat 11-ORNIA•CALIFORIJIA ENVIRONMENTAL pFtMECTION AGENCY <br /> PETE wn.saN Ciovwna <br /> STAB W TER RI�SOIIRCES CONTRdC BOARD <br /> PAUL n.©ONDL ti.:ON BUIL DING , <br /> Vol psi HEET "rte <br /> P.0,110Y tflo •• ~ <br /> SACIIAME:NiO.CA1.IFOHNIA SSS12 010 <br /> (916) 657-0941 <br /> (916) 657-0932 (FAX) <br /> DEL 8 1995 <br /> All Ikeginnal Water Board Chairpersons <br /> Al Rcgional Water Board Executive- Officers <br /> All 1,01' Agency TWectars <br /> LAWMI'ME 1.1VERMORE NATIONAL. LABORATORY (LLNL) REPORT ON LEAKING <br /> UNI)IsRGitOUND STORAGE TANK (UST) CLEANUP <br /> Ili October 1995, the I,LNI. presented to the State Water Resources Control Board (SWRCB) its final <br /> report, lzcconimendalinns to Im�re�vc the Cleanu .Process for California's Leak ne tlndereround Duel <br /> Tanks, 'flue I I NI. tcaw found that the impacts to the environment from leaking USTs were not as <br /> scvcr4 as we once thought- 7'he report also presents a convincing argument that passive <br /> 1)iotenicdiation should be considered as the primary remediation tool in most cases once the fuel leak <br /> sc>urc:e 11as been removed. <br /> 'Illc I.I,Nl, report I)as also been presented to the SWRCR's SS 1.764 Advisory Committee which will, <br /> in turd, luovide recouunendatiuns to the SWRCB by the end of January 1996. The SWRCB rutty <br /> th(r()5c u) ittllilcmcnt recoliimendations from the LLNL' rcpori and the SB 1764 Advisory ('Uminl[lee <br /> t}lrourll rcvisi()ns 1() SWRCR Resolution 92-49 in early 1996. <br /> In the it1tL�I inl and in light of the findings and recommendations in the LI.NL report, we believe <br /> cicanul) oversight agencies should proceed aogressively to close low risk sail only cases. For cases <br /> uffectint� )t1W tisk groundwater (tor instance, Shallow groundwater with maximum depth to water less <br /> th;Il] SU fret torsi no dririkinL water wells scrccned in the shallow grt)undwater zone within 250 feet of <br /> the leak) we reconullend tliat active reinedixtion be replaced with monitoring to determine if the fuel <br /> leak plun1L is stabk'. Obvirnlsly good judgment is required in all of these decisions. However, that <br /> jtltil]]tent houlcl now include kmawledee provided by the 1.,1.NL report. <br /> What 1 1)rtll)I�sc tat y(iuis not in any way inconsistent with existing policies Or regulations. However, <br /> it tft,e4 rel�rc sells a I1Lejor departure from how we have viewed the threat from leaking USTs. This <br /> Fnitllnce is eonaistent with the results of a discussion of this subject among the State Board Chair and <br /> lzt gl(litill I;oard Chairs on December 5, 1995, if you have any questions on this matter please <br /> call <br /> Mr. 3.ltttcs Ciiannapoulos, our manager of the underground storage tank program, at (916) <br /> 320. <br /> �1111Crl:ly, _ <br /> WnIt Pettit <br /> I>xccLttive 1)it�cctur <br /> cc: All l:eLiclnal Water Board/1.01' LIST Prof=rain Managers <br />