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<br />I <br />'I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />.ICHA <br /> <br />fiDaI Remri. Phue I R__ne Water OuaIitv Data CoD<<.1ioa StadY <br /> <br />Seot... ber 1995 <br /> <br />During this data collection effort it was determined that some of the pre-selected wells were not <br />suitable for obtaining representative water quality samples. This issue was discussed at the July <br />13, 1994 Technical Review Committee and, as a result of those discussions, JCHA prepared a <br />letter dated July 20, 1994 recommending the installation of small-diameter monitoring wells <br />adjacent to existing production wells for the actual collection of ground water samples. The <br />production wells that were recommended to be replaced with monitoring wells were the Rifle <br />Range well, Ford-2, Race-I and Loyd-2. At the Authority Board meeting on July 21, 1994, the <br />installation of these monitoring wells was approved. <br /> <br />Thereafter, during the period August 8-12, 1994, three monitoring wells were installed at the <br />approved alternate locations for the Rifle Range well (MW-9), Race-l (MW-6) and Loyd-2 <br />(MW-5). Prior to drilling a monitoring well adjacent to the Ford-2 well, Arapahoe Water and <br />Wastewater Authority personnel identified a pre-existing monitoring well which, upon <br />examination, was determined to be suitable for use in the Phase I baseline study. Therefore, <br />only three monitoring wells were drilled, rather than the anticipated four wells. Well <br />construction diagrams for wells drilled as a part of the Phase I baseline study (MW-S, MW-6 <br />and MW-9) are presented in Figures 2-4, respectively. <br /> <br />All of the monitoring wells were installed prior to the initiation of the water quality data <br />collection program. Once the three new monitoring wells had been installed and developed and <br />were ready for sampling, the Phase I baseline study was initiated in August 1994. The locations <br />of each of the sampling sites are shown in Figure I and described in Table I. <br /> <br />SAMPLING PROCEDURES <br /> <br />JCHA prepared a draft quality assurance/quality control (QA/QC) manual, which was attached <br />to the proposal for this study (JCHA, May 16, 1994). Comments were received from the <br />Technical Review Committee regarding the draft QA/QC manual, which was then finalized. <br /> <br />-3- <br />