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k TEL No . 5ep 4 , g< 12 17 No 005` F Al <br /> f <br /> FACILITY: Defense Distribution Reg?;5"Ast (Dp 't r <br /> LOCATION: Tracy � <br /> 1 Post-it""brand tax transmEttal memo 7$71 kof page& s j <br /> CON, %or a o.z En n, ry ':""Y, <br /> p` 1 � w l�lliGim <br /> -. Co '110 �,! Co. PVU 65 <br /> - <br /> PROPOSAL DATE: Apri 1'1979 Depl � Aonok/qI�)3 I—X70 <br /> Faxkl[( � �G� C:_1fGLIt <br /> Monitcring. We y, si <br /> Soil Boring(s) <br /> ncg(s) ' SEP 0 4 1992 <br /> Soil Excavation( s) Depth ENVIRONMENTAL HEALTH , <br /> PERMIT/SERVICES <br /> X Supply Wells; depth approx- 900' bys. <br /> Phos, S and 9 <br /> _20 the above proposal concerning the above check items and the <br /> ?rpp•Sa ' S ' eatable. <br /> Dace: u 3e _tv0er_ 1992 Staff Sign at ure;_`t.��t <br /> From a water quality perspective, the supply wells should be installed in the furthest <br /> most op gracient location (i .e , , K the southwestern portion Df the site) and the Lower <br /> Tulare FormatKn must be sealed off from the Upper Tulare Formation, which is contaminated <br /> ivith vnlatiie organic constituents (VOCs) . We assume that the primary casing will be <br /> exOnded through the Corcoran Clayto c <br /> ( e base ❑f tYri� unit) to prevent cross-contamina- <br /> tion from. the Upper Tulare to the L Ar Tulare. <br /> The final screen interval In - d be based on lithologic and hydrologic data collected . <br /> during drilling and logging. The gravel pack should not be restrictive. <br /> in addition, we recommend that the well de � to reconsidered for the following reasons: <br /> The gravel pack interval above the sc-eer section should be reduced n length. <br /> k major portion of the proposed 230' of gra. y in the annulus should instead be' sealed, <br /> w1th cement to: <br /> I. Reduce the potential for cross-contamination within the Lower Tulare Fm. Well <br /> No, 1 at the site was recently abandoned and sampling at bib, to 632' bgs (prior to <br /> abandonment) revealed low concentrations of pesticides in the ground water samples. <br /> 2. Reduce well lasses associated with a lora gravel pack. This would tend to increase <br /> well efficiency and reduce the total gravel loss (from the gravel pack) over the <br /> life of the well . <br /> The wells should be electric logged (SP and Resistivity) . f <br /> i <br />