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1.0 INTRODUCTION <br />' On behalf of the Union Ice Limited Partnership, ICF Kaiser Engineers, Inc (ICF KE) <br /> measured groundwater levels and collected groundwater samples for chemical analysts from five <br /> monitor wells (MW-1,-2,-3,-4 and -5) at the former Union Ice facility at 425 North Union Street, <br /> Stockton, California (Figure 1) as part of a required quarterly monitoring program This report <br /> presents the results of the water-level measurements and the chemical analyses A summary of <br />' the site background, previous soil and groundwater analytical results, and remedial efforts is <br /> presented in ICF KE's "Soil and Groundwater Investigation Report" (ICF Kaiser, 1994) <br /> 2.0 WATER-LEVEL MEASUREMENTS <br /> 1 <br /> Water-level measurements were recorded for Wells MW-1 through MW-5 on October 31, <br />' 1995 Measurements were made using an electric water-level probe graduated in 0 02-foot <br /> increments The lowest point on the open well casing is marked and was surveyed as the <br />' reference point for the water-level measurements (except for MW4). Water-level elevations <br /> were calculated based on the results of a level survey performed on October 31, 1994 to <br /> determine reference elevations of Wells MW-1, -2, -3, and -5 Figure 2 presents the <br /> potentiometric surface as measured on October 31, 1995 Because the reference elevation of <br />' Well MW-4 was not surveyed in October 1994, the water-level elevation measured in this well was <br /> not used to prepare the map of the potentiometnc surface (Figure 2) <br /> The most recent and selected historical groundwater measurements are presented in <br /> Table 1 The elevation of the potentiometric surface increased an average of 8 5 feet from <br />' October 1993 through April 1995, and has remained fairly steady since April. The direction of <br /> groundwater flow is toward the northeast (approximately north 60° east) with a horizontal <br />' hydraulic gradient of approximately 0 002 foot/foot (Figure 2) <br />' 3.0 GROUNDWATER SAMPLING <br />' On October 31, 1995, groundwater samples were collected from monitor Wells MW-1 <br /> through MW-5 Each well was purged of approximately 3 well-casing volumes using a clean <br /> variable speed submersible pump (Grundfos Rediflo-2) The purge water was contained within a <br /> R4182M 1119541 <br /> 4thgtr 95 1 <br />