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f� <br /> The memorandum, prepared by Rick Rempel of the State Water Resources Control Board <br />` Division of Clean Water Programs, summarizes the effects of UST releases on water <br /> supply wells in the Central Valley. The memorandum states "...that significant adverse <br /> impacts to active beneficial use of groundwater caused by LUFT sites occur only in the <br /> rare instances when shallow,water-bearing zones are tapped by private, domestic supply <br /> wells which are located within 100-200 ft of leaking underground fuel tanks." The <br /> memorandum also offers the following conclusion: Finally, the weight of evidence <br /> indicates that most LUFT sites should be approached with the attitude that they are not <br /> likely to be major problems beyond the immediate confines of the tank pit, pipelines, and <br /> pump islands, and_that about 0.3% have measurably impacted some sort of water supply <br /> well. <br /> Attached for your review and approval is a copy of calculations and assumptions for a <br /> Domenico solution, along with some reference materials that should enable you to follow <br /> the calculations. Based upon the results of these calculations, this site fits into the vast <br /> majority of sites in the Central Valley that are not expected to adversely,impact actual <br /> beneficial use of shallow groundwater, or to be major problems beyond the immediate <br /> confines of the tank pit, pipelines, and pump islands. <br /> f - <br /> While one could make a reasonable case that site closure would be appropriate after more <br /> detailed fate and transport modeling is presented, it also seems that continuing quarterly <br /> monitoring could also be recommended. We plan to continue latter approach of <br /> t corrective action at this site. If you disagree with this approach, or have other questions <br /> or concerns, please give me a call. .1 can be reache&at (206) 251-0689:' <br /> Sincerely, <br /> cott Hooton , <br /> Environmental Resources Management <br /> attachments (3) <br /> cc: site file <br /> B. Nagle - Alisto (w/attachments 2 and 3) <br /> California Regional Water Quality Control Board, Central Valley Region, <br /> Attention Ms. Beth Thayer, 3443 Routier Road, Sacramento, CA 95827= <br /> 3098 (wl all attachments). <br /> 4 <br /> i Domenico,P. A., '1987,"An Analytical Model for Multidimensional Transport of a Decaying <br /> Contaminant Species" J. Hydrology 91,49-58., <br />