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04/11/2000 15:02 925-463-2559 ATC PLEASANTON FAUL t7G <br /> Mate 4"tex- Resources Control- oaxd <br /> Division of Clean Water Programs <br /> Winston H.Hiekax 2014 T Sheet-Saaamente,ldafmnia 95814•(916)1214313 Gray Davis <br /> ,emAiryfor Maaing Address. F.O.Bu 944212•Sunniemo,CilUmnia•94244-2120 Gavunor <br /> Errvirorenentcl FAX(916)227-4349•Inamet Addmw hvptltw swmb.c Vv ; <br /> Prolaetlon <br /> NOTICE <br /> TO: Interested Parties <br /> GUIDE).1NES FOR INVESTIGATION AND CLEANUP OF MTBE AND OTFIER 1?THER <br /> BASED OXYGYWATES <br /> This notice is sent to inform you that a staEdaatt copy of a document entitled"Guidelines for <br /> Investigation and Cleanup of MTBE and Other Ether-Based Oxygenates"is available for public <br /> review.This is a preliminary review only,not a formal comment period preceding <br /> regulatory action,and no response to comments will be prepared. The document has been <br /> submitted to our academic peer review panel and will be revised following receipt of peer review <br /> comments. It is anticipated that the State Water Resources Control Board(SWRCB)will <br /> consider the document at a public meeting in March 2000,which will be preced 'ed by a formal <br /> comment period. Responses will be prepared to comments received at that time.r <br /> The current draft of the document is available on the Internet at www.swrcb.ca.gov and click on <br /> "News". A paper copy may be requested by contacting Virginia Lopez at(916)-7274313. <br /> Background: <br /> Methyl Tertiary Butyl Ether(MTBE)has been added to gasoline to enhance octane and to <br /> comply with clean air act mandates. It was approved by the USEPA for use in 1979 and was <br /> added to gasoline during the 1980s at approximately 2-5%by volume as an octane booster. In <br /> 1992, it was blended at I0-15%by volume for use in some areas in the wintertime oxygenated <br /> fuel program. In 1996,it began to be used year round at 11%by volume in the swewide- <br /> re£ormulated gasoline program. <br /> When released into the environment,MME has high solubility in water,low retardation in soil, <br /> and is slow to biodegrade.These properties combined with its high percentage ill gasoline cause <br /> the potential for high source area concentrations,Long plumes in groundwater,and long residence <br /> times in the subsurface. It also has taste and odor characteristics that can impair wB#er supplies at <br /> low concentrations. <br /> California Envirgonrxental Prorec>fion Agency <br /> .I4 RtcycladPaper <br />