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- south of the--pit for lazger distances may be a long-term issue for Aggregate <br />_ ..- Industries Yo address. While the aquifer-is generally quite highly transmissive and : -: - - <br />_. while .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 />pumping in a mazginal well may suffer as a result of the impacts predicted. The <br />situation,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 />originally intended demands now is unable to do so. These include poor or <br />substandard original construction thus resulting in inefficient structures less able <br />to respond to local drawdown conditions, old structures that have lost efficiency <br />due to encrustation or bio-fouling types of plugging, pump problems, pumps set <br />too shallow to adequately produce from the full saturated interval, local <br />hydrogeologic or geologic vaziations, well to well interference due to operation of <br />more wells in an azea, and filling in of wells due to sand pumping resulting from <br />poor original construction. <br />In light of these types of issues, it is recommended that Aggregate Industries <br />consider implementing a plan of well monitoring and piezometer installation and <br />monitoring to gain background data on the current aquifer conditions, data on <br />neighboring wells in the vicinity that could be impacted, and data on historic and <br />current pumping rates and efficiencies of selected wells that could act as a <br />15 <br />Martirs and Wood Water Consultants, Inc. <br />