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- - - � IMML x. <br /> 9 <br /> CIIAPTE. <br /> IIYDROGEOLOGY <br /> Bruwn and Caldwell's September 28, 1987, Problem Assessment Report contains a detailed <br /> description of regional and site geology. This chat's presents a revised interpretation of the site <br /> geology based on the borehole <br /> lDe'rian from extractf the four Ilew ion well 11 '[�Xring lls and borehole logs for through his <br /> as well as pump test d interpretation Appendix D. <br /> investigation are included with this report as App <br /> The site is underlain by alluvium which consiresests nta ionbof c osscdded vsections ers of AW an dBlB;. <br /> Figure 3-1 is a site map showing the surface rep <br /> Cross sections AWand B-B' are presertcd on Figures 3-2 and 3 3 and incorporate lithoiogy <br /> logs from the most recent investigation as well as past investigations. <br /> All of the monitoring tivells were surveyed for vertical and horizontal location on <br /> October Meridian <br /> Engineers, licensed tonal surveyor. a <br /> ta <br /> is usedin the deterrirationof groundwater elevation measurements. Table 31psentshe <br /> on site benchmark with an <br /> survey data. The wells were surveyed relative to a temporary <br /> The temporary bench mark is identified on site maps <br /> assumed elevation of 50.00 feet (ft). <br /> throughout this report. <br /> ow the <br /> Groundwater was encountered in <br /> Octoberdl9[h1990 grouhs between rrdwand <br /> ater wt be flowinggto the <br /> f <br /> surface. Bases! on measurements <br /> northeast under a hydraulic gradient of approximately 0.008. Since the groundwater elevation <br /> ction <br /> has been monitoit to <br /> matel d at 90 degrees)s site the rFig�rea3 4 presenter flow tsegr undwaterael a elevation contours and <br /> southeast (approxt y <br /> flow direction for October 19, 1950. <br /> Step Pumping Test <br /> The immediate purpose of the groundwater extraction well (TEX-1) is to provide a means <br /> final <br /> of conducting an aquifer test to determine the aquifer characteristics (relevant to in the final remediation stern <br /> groundwater renediaignsystem 1990 a sop -drawd n pumping tesesign), TEX-I will be dwas performed on TEX-1. <br /> design. On October <br /> TEX•1 Step Drawdown Pumping"fest <br /> A step drawdown test was performed for 6 hour <br /> s ae4D 1. �he1Ctotal gallons flow rates eCP meed eat <br /> by readtrtg thz pumps totalizer flow_..meter an.. <br /> _--.. watch <br /> - <br /> predetermined time increments. Flow was adjusted using agate valve. A digital stop was - <br />