Laserfiche WebLink
(or other means to monitor). would be needed to <br /> evaluate performance of pilot (and full scale) <br /> flushing system. <br /> o Construction specification for neutron probe <br /> monitoring tubes is questioned. The planned <br /> grouting of the annulus may inhibit the usefulness <br /> of this instrument. Examples showing successful <br /> implementation of this technique as well as an <br /> estimate of the "sphere of influence" (with grouted <br /> annulus) are needed to complete an assessment of the <br /> proposed design. <br /> o Drilling through soils contaminated with arsenic, <br /> copper, and chromium using air rotary techniques may <br /> yield air emissions above acceptable standards. <br /> Should MCTC wish to pursue the use of this <br /> technique, air monitoring may be appropriate to <br /> assess potential impacts. Use of auger and/or mud <br /> rotary should be considered as an alternative. <br /> Ground Water Collection System <br /> o Re; Section 2G-6, EXTRACTION WELLS, pages 2G-2 & <br /> 2G-3 , Specifications and Documents: <br /> Specifications for placement of centralizers are <br /> not included in discussion. One centralize must <br /> be placed at the base of the well , then every 40 <br /> feet thereafter. Well logs should also note <br /> location of centralizers. <br /> James C. Austreng <br /> Waste Management Engineer <br />