Laserfiche WebLink
Ms Suzanne JanZeu <br />Moecb d 1, 2005 <br />Page 2 aj4 <br />to'be an increase in water level in the well of less than''/Z fo t (see Table-Sj. This is consistent <br />with our experience with similar sites in the area. The wm fined effect of the lining of Cell 1 <br />and the reclamation of:Cel1.2 as. wetlands will not increase th extent of the `mounding effects on . . <br />fhe well. Further, there is a-small natural drainage between ell l .and the well. If groundwater . <br />elevations increase; this drainage will provide a natural me of alleviating any such increase: <br />Alternatively, the drainage could be deepened slightly which ould allow for control of the up- <br />gradient mounding. <br />Cells 1 and 2 in Phase 2, and Cell 1 in Phase 3 of the mini operation will all be used as silt <br />ponds and reclaimed as wetlands. There are only two wells i the vicinity of these cells, permit <br />nos. 128682 and .12259, and both are owned. by Lafarge. We also note that there are an <br />additional three wells, permit nos. 1147, 1145 and 232943, 1 Gated in the immediate vicinity of <br />Phase 4 that may be impacted. However, these wells are also ontrolled by Lafarge. <br />Finally, Ce11 2 in Phase 5 will be used as a silt pond and r laimed as wetlands. There. is an <br />existing well (permit no. 4180) located immediately to then of the cell,. which is controlled <br />by Lafazge. <br />To the extent'that reclamation of the silt ponds changes the groundwater flow in the area, the <br />only potential adverse effects to structures not owned by Laf e, exist with respect to the well to . <br />the southeast of the site _ (permit no. 163521). Based on the groundwater model and our <br />experience with similaz sites in the area, these effects will limited to an increase in water <br />levels in the well less.than 1 foot above existing water levels: afazge will commit to. monitoring <br />the. groundwater levels surrounding the site; and' in. partic az the. area immediately to -the- <br />southeast of the site for two years following reclamation of P e. l to deternune if there are any <br />adverse impacts to well permit 163521. If monitoring of th groundwater. elevation shows an . <br />iherease in the wafer table coupled with a physical injury to a well, Lafazge will commit to the <br />above described rnitigadon with respect to the drainage betwe a Phase 1 and the well.. <br />14. Due to the potential for permanent impacts to groan water; the applicant may need to <br />take permanent mitigation measures such as. instalh g French drains. The applicant' <br />should consider this eventuality and respond to the co cern, . <br />Lafazge recognizes that the reclamation of the site will cause odifications to the natural llow'of , <br />groundwater in the azea. These changes are most-significant m the lining: of certain areas of <br />the site and from silt ponds reclaimed-as wetlands. In gene ,the-effects of reclamation of the <br />site will be increases in the water table. elevation up-gradien and- decreases in the, water table <br />elevation down-gradient of these areas.. As described above, the effects of the modification of <br />the groundwater flow in the area from the silt ponds on existi g .structures will be minimal, and <br />what effects there are Lafarge will commit to the necessary mi igation measures. <br />With respect to the areas.that will.be lined after reclamation'is completed, these azeas include <br />only Phases 1 and 4. The groundwater modeling shows that a change in water-table elevations <br />