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' a <br /> I <br /> .. wmv� <br /> ti ,. rI <br /> • - -'., e �" PIP <br /> t : <br /> � R <br /> f <br /> 6 May 1951 <br /> ¢ EVAX Project 2260-03 <br /> f� <br /> Well Construction f the <br /> s iestalled the wells on March Sc dupe 40, polyviny1 under the lrvision o <br /> chloride (PVC) <br /> geologist. <br /> Slle In accordance <br /> geologist. Flush thread jointed, the base of MW-25 casing was set <br /> casing a' 2-inch diameter was in in each boring. <br /> with the vapor-extraction system design, <br /> of <br /> at a depth of 77 feet belo42ground <br /> eet) surfwasace. dewithe0.020finchsslots nand <br /> =� mti-25 casing (from 77 toa of <br /> the ng <br /> remaining section of the casinsu was <br /> ssface lid. he ba30-footWsection-26 }of <br /> was set at 59 feet below 9 was screened with 0.020-insnots the <br /> VW-26 casing (from 59 to 29 feet) was slipped <br /> .y. casing section was solid. A well cap <br /> the remaining <br /> base of the casing of each well- and borehole wall was filled <br /> The annular space between the well casing a sand was poured into <br /> with the following materials. No. 3 Monterey Type <br /> imately 2 to 3 feet <br /> the annular space from the base of each well Atlayer of bentonite pellets, <br /> above the tap of the scree}acedelabove�the sand pack and clean water was <br /> 2 to 3 feet thick, was p (approximately the <br /> was then <br /> added to hydrate the benMenZe•andh�5rfootn�sectionlr.f VWbox was placed <br /> top 38-foot section of rout. A traffic rated utility <br /> filled with neat cement g <br /> around she wellhead and set in concrete even with the ground surface. A <br /> ~ locking well cap was placed on the wellhead. 11 with a bailer and <br /> 1991, Hazmat developed MW-25 manually s <br /> On March 29, <br /> black. Hazmat reported a0 gallons; of water were <br /> steel drum.batled from the <br /> surge 5 <br /> well and stored on-site in a 55-gallon cap <br /> s'= Water Sampling <br /> 1581, Sampling activities included depth j <br /> EVAX sampled MW-25 on April 3, and purging and sampling <br /> t� to water measurement, subjective evaluation, <br /> groundwater for laboratory analysis. electronic th toswater <br /> wateralevelsuindicaile <br /> G nearest 0.01 foot with a Sol ng a clean Teflon bailer. <br /> Subjective evaluation Consistcastofthe air-water interface. lheer <br /> approximately half its length p <br /> arbors product such as #lasting product, <br /> - was then retrieved from the well and water was examined for possible <br /> evidence of petroleum h,d <br /> sheen, or odor. of approximately 15 <br /> subjective evaluation, Mol-25 was purged <br /> Following level in the well recovered to <br /> -- ---- a water.._sample was retrieved from the <br /> -gallons----using_a_ ._bailestaticflevelhe water -- -- <br /> at least 80% of the lass <br /> well using a pre-cleaned bailer as explained , glass <br /> The glass containers were then <br /> i bailer was trin�teamberinglasOs bottle.Th organ, <br /> s <br /> vials and a <br />