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r` <br />' south' of the pit for larger distances may be a long-term issue for Aggregate <br />~ , <br />to address. While the aquifer is generally quite highly transmissive and <br />well permit records indicate that the aquifer can and does support wells <br />producing 600-1000 gpm, thus indicating that small amounts of pit dewatering <br />induced drawdown should not have significant adverse impacts on the ability of <br />wells to maintain their pumping rates, there may be isolated instances where <br />in a marginal well may suffer as a result of the impacts predicted. The <br />is made more difficult to adequately assess in light of the fact that there <br />may be many reasons why a well that once produced sufficient amounts to meet <br />intended demands now is unable to do so. These include poor or <br />original construction thus resulting in inefficient structures less able <br />to respond to local drawdown conditions, old structures that have lost efficiency <br />due td encrustation or bio-fouling types of plugging, pump problems, pumps set <br />too shallow to adequately produce from the full saturated interval, local <br />or geologic variations, well to well interference due to operation of <br />more wells in an area, and filling in of wells due to sand pumping resulting from <br />poor iriginal construction. <br />I <br />In light of these types of issues, it is recommended that Aggregate Industries <br />plementing a plan of well monitoring and piezometer installation and <br />to gain background data on the current aquifer conditions, data on <br />wells in the vicinity that could be impacted, and data on historic and <br />aping rates and efficiencies of selected wells that could act as a <br />15 <br />Martin and Wood Water Consultants, Inc. <br />