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concentrations of hydrocarbon contamination in the wells was <br /> described above in Section 1 .2.2. <br /> i . <br /> Copies of the analytical results are included as Appendix F. <br /> 3.5 SURVEYING AND GAUGING DEPTH TO GROUNDWATER <br /> The 'wells have been gauged periodically since December 1986. to <br /> reccrd the depth to water for use in establishing gradient direc- <br /> tion and to inspect for the presence of floating product. Depths t <br /> to. water were measured by- EA personnel with an ORS optical inter <br /> face .probe calibrated in decimal feet. <br /> The wells were surveyed after completion under the direction of <br /> GTI. <br /> j As reported above in Section 1 .2, EA re-surveyed the five .wells <br /> on 7' February 1990 using standard geodetic techniques (Brinker <br /> and Wolf 1977), a L1etz Model C3E automatic level, and a fiber- <br /> glass level rod marked in decimal feet. The depth to water was <br /> 71 gauged from the surveyed- reference point on the top of the casing 1 <br /> with. an ORS optical interface probe identical`.to the. tool used <br /> 1 <br /> i <br /> for gauging these wells since EA. began gauging .in' December 19�3f..s _ } <br /> !` All measurements were +0.01 'feet. . <br /> The wellhead elevations from the .-February 1990 EA surveying were <br /> calculated using ars assumed elevation of 100 feet for MW1 . The <br /> Y EA „-ilevation calculations differed only slightly from the eleva- <br /> C tion values for the five wells as reported in the 1987 GTI <br /> Is report FA found that MW4 and .MWS were approximately 0. 1 foot + <br /> t <br /> higher than`reported ;by GTI. Thenew elevation values, the <br /> groundwater elevations calculated using :these new wellhead eleva- <br /> tions, and depth-to-water data. from EA gauging surveys conducted <br /> since February 1988 are :shown in Table 2. <br /> ,, . e35[71050/2-90/tx . 24 <br /> b4 � <br /> I FA <br /> i- r - <br /> - <br />