Laserfiche WebLink
t <br /> J. H. KLEINFELDER & ASSOCES <br /> File: S-1008-21/12 : 337 <br /> Revised: July 8, 1986 <br /> Page 5 <br /> compatible with 0 .02-inch screen and most, aquifer <br /> materials. Unless the conditions encountered are <br /> vastly different than the available information <br /> indicates, a #2 or #3 sand backfill will be used. <br /> C . Bentonite <br /> Bentonite pellets shall be used to form a 2-foot seal <br /> in the annular space after placement of sand filter and <br /> prior to placing the surface seal . Water will be added <br /> to the pellets after placement . <br /> D. Grout <br /> A cement grout will be used to backfill the remaining <br /> annulus section to the surface. Grout shall be tremied <br /> to prevent bridging in the annulus. <br /> WELL DEVELOPMENT - <br /> Well development shall be done by pumping, air lifting, or <br /> other suitable methods until the water produced is clear and free <br /> of appreciable fines. <br /> MONITORING WELL INSTALLATION <br /> Four ground water monitoring wells approximately 175 feet <br /> will be installed at the locations shown on Plate A. A typical <br /> monitoring well installation is shown on Plate C. Wells will be <br /> screened 5-10 feet above and 20-40 feet below the first <br /> encountered ground water unless the first ground water zone is a <br /> confined zone. If a confined or semi-confined situation is <br /> encountered, the well shall be completed in the first impermeable <br /> zone. Otherwise, the well shall be screened to a depth 30-40 <br /> feet below the water table, if no impermeable zone is <br /> encountered. There will an experienced, knowledgeable <br /> professional (geologist or engineer) present on-site to make <br /> these decisions during the well installation, and the <br /> installation of the wells shall be performed under the direct <br /> supervision of a Registered Geologist, as required by Subchapter <br /> 15 . The northern-most and southern-mast wells will be drilled <br /> first before drilling the east and west wells. To ensure that <br /> accurate groundwater elevations are determined as ground water <br /> is encountered, proposed well locations will be surveyed before <br /> drilling begins, and a marker should be established near each <br /> well site. Whichever well (or wells) on the site becomes the up- <br /> o <br />