Laserfiche WebLink
ARCADIS <br />Abandonment of IC -10300 and IC -10370 <br />Abandonment of existing piezometers will be performed consistent with State of <br />Colorado Water Well Construction Rules and Regulations (2CCR 402 -2, Rule 16) for <br />a Type III aquifer. Abandonment activities are described below: <br />1. Piezometer casing will be filled with clean 10 -20 sand to the static water <br />level. <br />2. Cement grout will extend to the ground surface above the sand. <br />3. Well head and casing will be removed to an approximate depth of 5 feet. <br />Drilling and Installation of IC- 10300R and IC- 10370R <br />Drilling and installation of new piezometers will be performed consistent with State of <br />Colorado Water Well Construction Rules and Regulations (2CCR 402 -2, Rule 14) for <br />a Type III aquifer. The new piezometers identifications will be given a suffix of "R" to <br />denote them as replacement piezometers. Photographs showing the two drill sites <br />along with the new staked location are provided as an attachment. The primary <br />components of the drilling program are discussed below: <br />1. Both boreholes will be advanced using air -rotary casing hammer through <br />waste rock to the top of bedrock at depths of approximately 220 feet. <br />2. Boreholes will be located within approximately 40 feet of the existing <br />piezometers (exact locations will be dependent on site conditions) <br />3. Boreholes will be nominal 9 -inch diameter and completed as 5 -inch diameter <br />schedule 80 PVC piezometers. <br />4. Screened intervals will be 20 feet in length with a slot size of 0.01 inch. 10 -20 <br />sand filter pack will extend up to 5 to10 feet above the top of the screen. Up <br />to 10 feet of bentonite chip hydraulic seal will be placed above the filter pack. <br />The remaining annulus will be filled with high - solids bentonite grout. <br />5. Site restoration, grading, and revegetation. <br />6. Preparation of a completion report. <br />Piezometers will be developed using a surge block, bailer, and submersible pump <br />until water is clear and field parameters have stabilized. Field parameters include <br />pH, specific conductance, and temperature. <br />Bob Oswald <br />August 8, 2011 <br />Page: <br />2/6 <br />