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3av`b �. � �`�2-` ,.w-a'-�Y' -" Tw- .� � "-:✓3f-ft _ '..��. _ 'i ciR`+ -. -gip£.' - 't' r� _ r <br /> ti <br /> i <br /> {F <br /> 17 <br /> 1 <br /> velocity sediments found at MW2 as compared to the sediments at <br /> i MW1 as calculated from the Slug Test presented in Update Status <br /> r Report 5. Historically this site has shown flow directions to the <br /> southeast and east. <br /> Figure 4B (5-24-91) represents depth to ground water during vapor <br /> extraction and has two sets of ground water contours represented <br /> oat it. The dashed lines represent the actual physical ground <br /> water level without corrections for the lower pressure occurring <br /> at the water level due to vapor extraction. The heavy <br /> represent the effective ground water level is lines <br /> The depth to water measurements are corrected for <br /> vacuum <br /> i (presure drop) at that well from vacuum reading measured on June <br /> 27, 1991, see Figure 6E. To obtain the potentiometric head for <br /> each well the vacuum reading (millimeters of water) is converted <br /> into feet by the following. <br /> } 25.4 mm/inch x 12 inches/foot x vacuum reading=VACUUM FEET WATER <br /> This foot reading is then subracted from the actual depth. to <br /> ground water measurement of the well to correct for depth <br /> head. Ground water flows to areas -of lesser pressure, which the <br /> potentiometric contours represent. <br /> -o <br /> The overall ground water elevation beneath this site' has showed a <br /> decline since the January, 1990 gauging. As of March 29, 1991 the <br /> ground water has decreased in elevation as much as 12.54 feet at <br /> I MW2 to 9.2 feet at MW4, see Table 1. <br /> { CHEMICAL RESULTS-GROUND WATER SAMPLES <br /> Ground water samples wer.-e: obtained from all six on site monitor <br /> wells on March 29, 1991 (MW-1, ...MW-2, MW-;3, MW-4, MWS, and Mw5) <br /> - The samples obtained from kV3 •were too silty for the, laboratory. to <br /> analyzed, this well " was `' t:_r <br /> .laredeveloa qd by e_ Tank <br /> ,7Gas:»onc <br /> Jt Testingsir':using vacuum lift and sluggs o city nater to enc <br /> the silts from the sand pack prior to the,, 3+s1 halP wash <br /> water produced by the redevelopment is currently be glstoored Aon <br /> site in 55 gallon drums. Prior to obtaining the greund .water <br /> ` samples each well was purged using a hand' barer, until the s` <br /> temperature, pH, and conductivity stabilized, ?approximately 2-3 <br /> gallons of water, see Appendix C. This purr,-ed water is �.. <br /> being stored on site in 17E 55 preser._ly <br /> __- -_ gallon_drums.__ Previously_-stored -- <br /> purged-ground water from the initial development of the wells and <br /> the quarterly samplings was discharged to the sanitary sewer clean <br /> out after obtaining permission from the Municipal Utilities Dept. <br /> for the City of Stockton (approximately 800 gallons) , see Appendix <br /> E. � <br /> page 3 <br />