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�. -"--a-'':m , _ _ y' "'^..tea' <br /> 3 tix <br /> 10 <br /> ' a <br /> , <br /> I <br /> I <br /> I <br /> ' 1 <br /> KONITOR WELLS <br /> The excavation destroyed or damaged all monitor wells except <br /> for MW-3. -lsusable but <br /> damaged <br /> 35etoeeb <br /> Tt can still be used to measure water level butnayne <br /> useable for sample water. See Plate No. 4. <br /> Monitor ;jells No. 4 and 5 were drilled in August 1987. Well <br /> mr and <br /> logs are attached. These two wells are 4" in diay bailing4and <br /> uciLled to 55 feet deep. Wells were developed by <br /> pumping and water contained in drums on site. <br /> Soil structure in both wells is similar to that found in <br /> prior drillings near the tank site. <br /> One well remains to be drilled in Weber Street southeast Of <br /> the tank hole. As yet the City has not issued the eacroachment <br /> permit . <br /> Monitor, Well MW-3 was assumed to have a trsp.. ai pipe <br /> elevation of 67.73 and a level survey was made to MFT-4 and MW-S: <br /> Depth to ground ,dater measurements are ' in the range .c€ 40. feet. <br /> The slope of the ground water is 'approximately .4 to . 5 _.feet.. per <br /> 1010 feet in the easterly direction. using Coefficient of <br /> Permeability value developed by Klienfelder and Associates in <br /> the velocity o€ the <br /> borehole _S 10_-43 30.5 feet (K = 2x10-5cm/Sec) . <br /> ground -wa'rer would be approximately <br /> in operation for 2imately 3+ ft/Year If the site has <br /> been 0 years, the ground water contamination 4 <br /> feed. This may be the reac-on for <br /> could spread 50 to 140 <br /> contamination in i4W-5. <br /> k IoY�i, or NPL pests ,'2xnicate ,; that.;,r vhs 1ev21 0€, TGluene <br /> cont,am�,ia_t xon~iR, �O'3 has : ''!w ased;: f ram ;3 4 :PPB, t0"19,7 PFB. 'and <br /> i. <br /> a <br /> Xylene <br /> . ,.from <br /> PPB <br /> Xyle375Pt3,. ,whi]e,;Ee;lzQne,. as <br /> de,.rease. from;. 19 PPB'to.A 6 Pl'E <br /> Mox��tor Well Na 35 . alsu.,.: has cont.4mipat,ion.• This r,as not <br /> expected :since"' tine "ground water `slof-e is"+eas"rerly. mv? <br /> :. <br /> o'' bailed and retested on November 25 <br /> 1987. Test results are shown A. <br /> k in the following table. Note that MW-5 does not - -show <br /> f contamination in latest test. <br /> t� <br /> t. <br /> - r - <br />