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Last modified
1/26/2010 12:48:07 PM
Creation date
10/11/2006 11:29:20 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8449.850
Description
Metro Water Supply Investigation - MWSI
State
CO
Basin
South Platte
Date
8/1/1995
Author
Hydrosphere, HRS
Title
Phase II Conjunctive Use Summary Report - Draft
Water Supply Pro - Doc Type
Publication
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<br />MWSI Project <br />Phase II Conjunctive Use Summary Report - DRAFT <br /> <br />August 22, 1995 <br /> <br />potential required for the precipitation of iron and manganese, Therefore it was <br />concluded that chlorine and dissolved oxygen in the recharge water could be <br />oxidizing iron from the well casing, <br /> <br />. As previously mentioned, the Willows study believes that variations in water <br />temperature and viscosity between Ihe injected and native Arapahoe aquifer water <br />inhibits mixing and adversely effects the hydraulic head buildup during injection <br />and specific capacity of the injection well. <br /> <br />. Air entrainment, chemical precipitation, mechanical plugging in the well and <br />gravel pack are not major factors in the specific capacity reduction at Well A-6A. <br /> <br />. The injection process is very efficient. Only a small amount of water injected has <br />to be pumped to waste at the beginning of a pumping cycle. <br /> <br />. The water quality of Denver Water source water is excellent, and no adverse <br />impacts to the Arapahoe aquifer water quality at Well A-6A were observed, <br /> <br />J <br />. Head buildup from injection at Well A-6A exceed theoretically expected levels, <br /> <br />. Variable permeability and hydraulic heads among the sandstone units of the <br />Arapahoe aquifer are likely causing some of the decline in well specific capacity <br />due to differential volumes of injected water being accepted and, during <br />subsequent pumping, causing changes in how each of the sandstone units produce <br />water, <br /> <br />. Iron bacteria and pseudomonas were identified in water pumped from A-6A, <br />However, neither appeared to have a significant effect on the injection process or <br />the well specific capacity, <br /> <br />. Another factor which may be affecting the well specific capacity to a lesser degree <br />are the introduction of free residual chlorine and dissolved oxygen to the well. <br /> <br />Centennial's studies have concluded the following: <br /> <br />. The pH of the recharge water should be greater than 7 and less than 8.3 to reduce <br />the potential for the precipitation of iron and calcium, This concern can also be <br />addressed by maintaining a buffer of recharge water in the aquifer. <br /> <br />. The introduction of oxidizing surface water may result in the precipitation of iron <br />oxyhydroxide, The amount of increase in iron from the iron oxyhydroxide and <br />the resulting decrease in aquifer permeability will depend on the amount of pyrite <br />present in the formation. Some pyrite was found in the upper part of the <br />Arapahoe aquifer. This was considered a minor potential problem. <br /> <br />14 <br />
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