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J. H. KLEINFELDER &ASSOCIATES <br /> File: W--2006-1 <br /> December 16, 2985 <br /> Page 17 <br /> verifiable margin of safety and build a statistical data <br /> base, periodic monitoring of the production well <br /> recommended during future use of the well . <br /> B. Ad scent Surface Im oundment <br /> The surface impoundments north of the excavation area <br /> lies between the river and the Guild winery property. <br /> The bottom elevations of these surface impoundments <br /> -- appear to be below the shallow ground water elevation <br /> measured in the monitoring wells and are probably <br /> exerting the major artificial influence on the local <br /> gradient. <br /> The surface impoundments are likely to also influence <br /> the quality of the local ground water. Samples of the <br /> surface impoundment collected by Guild contained toluene <br /> at 37.7 ppb. It is possible that other hydrocarbon <br /> - species may be present in the surface impoundment which <br /> could account for the detection of the hydrocarbons in <br /> Mw-2 and MW-4. Fingerprinting of the surface <br /> impoundment and shallow ground water would provide <br /> additional useful information and can be best performed <br /> T-by_major ion-analyses_-and-producing-stiff-diagrams-of----- '— - --- ----- <br /> the water. Magor ion analyses were performed on the <br /> surface impoundment water but was not performed on the <br />