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i <br /> FEF1. 1E. 199, 4:4E PM P 5 <br /> W .. <br /> to citizen inquiry.Has the plume been fully defined? Most monitoring wells <br /> are oriented along east-west lines to detect north-ward flow, Few <br /> monitoring wells are located on a north-south line, limiting knowledge of <br /> eastward-flowing plumes. Aerial photos taken by the US government over a <br /> numtmrr of decades show consistantly the remains of several historical <br /> streams as part of the Corral Hollow alluvial fan, indicating that preferential <br /> pathways within coarse grained stream deposits may be present. A 1937 <br /> aerial photo clearly indicates the major underground preferential pathway <br /> passing through a portion of the depot somewhat south of what became the <br /> rail facilities and the barrel stacking yards indicated as source of the <br /> contamination plume. A 1947 photo indicates tvx barrel storage areas and <br /> what appears to be a disposal pit-all lacated generally over this 4truucture. <br /> Former depot employees reported dumping the contents of leaking barrels <br /> into this pit and later complaining of headaches after having worked in th og's <br /> areas. There appear to be no off-post monitoring wells tapping into this <br /> geologic structure; all current wells are located geneally north of the line of <br /> this stream deposit, is this perhaps an unidentified plume? Is it the source <br /> of contamination of the Rose well and also mine? Has tho RWQCB initiated an <br /> investigation of this potential plume? Why not? Focusing w much attention <br /> on the plume heading north towards the Elks Club and ignoring definition of <br /> the eastern leading edge invites too many further questions. Investigations <br /> should proceed to assess if this area is a potential source area. Additionall, <br /> further test wails are needed to identify all potential preferential pathways. <br /> Why was the San Joaquin County Department of Health Services pressured of <br /> their portion of the investigation? <br /> Senator Johnson, would you please assist in obtaining answers to the above <br /> questions? Suddenly the problem appears much more serious than <br /> previously assumed. The staff at AAT has seemed to be be very <br /> accommodating, but too many questions remain unanswered even after all <br /> U-io years of study. I do wonder if undefined and unresolved problems exist <br /> on other bases in your district <br /> Glenn S Robertson <br /> cc: AncW <br /> Cabral <br /> Pomt}o <br /> Bomar <br />