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3. A "zero" line has not been fully defined to the north and <br /> northeast, and there are insufficient data at this time to define <br /> the size and direction(s) of the plume. <br /> 4. Additional work will be required to define the lateral extent <br /> of groundwater contamination. <br /> QMMNDATIONS <br /> 1 . It is recommended that quarterly sampling of wells #1 & #3 be <br /> discontinued; they have not shown any contamination since <br /> monitoring began. Quarterly water sampling should continue in <br /> well #2 until conditions change_ Water level measurements should <br /> continue in all three wells to determine gradient direction; if <br /> major changes occur, sampling of wells #1 & #3 should be done, <br /> again. <br /> 2. Spoil that was returned to site of the UST should be removed, <br /> along with any additional contamination that may be encountered. <br /> The site should then be filled with clean material, covered with <br /> asphalt, and restored to its' original condition. A program to <br /> accomplish that task is being prepared, and will be submitted to <br /> the County EHD as soon as bids are received, and necessary <br /> permits obtained. <br /> 3. One (1) - additional monitoring well should be placed in a <br /> downgradi.ent position in an attempt to define the limits of the <br /> plume in that direction. We are in the process of soliciting <br /> bids from qualified contractors, & are preparing a workplan to <br /> accomplish that task. We are planning to complete the task of <br /> overexcavation first; the information obtained may be useful for <br /> determining the location of monitoring well #4. <br /> Please do not hesitate to contact our office if you require <br /> addJi/ti�o ormation. <br /> W <br /> Wm. J A ter & Associates <br /> Octo r 20, 1994 <br /> cc: a Thayer, CVRWQCB \S-OEDGFD�O <br /> G. Lechich � C� <br /> M. Griffin MUM I HUNTER <br /> oto.860 <br /> of cw <br /> 2 <br />