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<br />COllibO <br /> <br />what is believed to be a good water quality site, another is what is identified as a potentially poor <br />water quality site (meaning it provides iron and slime bacteria with growth enhancing nutrients), <br />This will allow study of the existing well degradation process, Another similarly paired set of <br />wells built with the original design should be used to test new operating standards (avoiding <br />cascading, Le" never allowing the cone of depression to expose the top of the well screen), A <br />third pair of wells should be built with new design criteria and operated with the new operating <br />criteria, A fourth set of wells built with the new design and operated with old procedures can be <br />expected to degrade and may not be essential to these investigations, Salvage and reuse of as <br />many of the existing well components and controls as possible would be part ofthis replacement. <br /> <br />Well Design and Operating Better Site Poor Site <br />Procedures (Low TOC, N & P, (High TOC, N & P, <br /> higher elevation) , lower elevation) <br />Old Design & Old Operating # I #2 <br />Procedures' <br />Old Design & New Operating #3 #4 <br />Procedures <br />New Design & New #5 #6 <br />Operating Procedures" <br />New Design & Old Operating #7 #8 <br />Procedures <br /> <br />'Old Design & Old Operating Procedures: Current Design &Operating Procedures <br />"New Design and Operating Procedures would consist of shorter well screens and/or shorter <br />pumping cycles to prevent cascading, Le" to avoid the cone of depression exposing the top of <br />the well screen, <br />These three paired sets of wells would allow the testing of two hypotheses: <br />1. Wells were placed where parameters encourage biofouling by slime and iron bacteria, <br />II, Design and/or operation procedure problems lead to cascading water (the well screens are <br />too long or the pumping cycle is too long, such that the cone of depression exposes the <br />top of the well screen) which introduces quantities of oxygen into the aquifer, stimulating <br />bacterial growth, <br /> <br />The total number of wells needing to be replaced will be based on the relative success of early <br />rehabilitation treatment experiments and further detailed review of existing well performance, <br />