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•~ <br />is <br />Baseline monitoring of the site will commence by :ieptember <br />1999. The baseline monitoring schedule for groundwater. <br />monitoring wells includes monthly water level and water. quality (~ ~.~ <br />monitoring for a 13-month period. Piceance and Parachute Creeks ~E~,~> <br />will be monitored in accordance with current U.S.Geolociical arC ~ ~~ <br />Survey (USGS) monitoring schedule for these streams, since a ~(y„`~y~~" <br />baseline has been established at these existing stations. Spring ~~`~~~ <br />and seep monitoring will be conducted twice per year, <br />corresponding to high flow (spring) and lower flow (fall) <br />conditions for the baseline period and during solution mining <br />operations. <br />Solution Mining Well Field Monitorin~Proaram (Conc.ition 1) <br />The monitoring requirements for Class III wells are <br />specified in 40 CFR Part 146.33. American Soda's proposed <br />monitoring program follows those requirements and includes these <br />elements: <br />Mechanical integrity testing (MIT) will be performed on each <br />well prior to operation. Mechanical integrity will be <br />demonstrated by a combination of methods, including: <br />• cementing records, Temperature Survey, (within <br />nine (9) months of the Assistant Regiona.i <br />Administrators letter authorizing American Soda to <br />commence injection but, also the well must have <br />been in operation for 30 days!. <br />• pressure testing, and <br />• cement bond logs (CBL). <br />T_f procedures for the tests listed above are fo11o4~ed, the <br />required MIT tests are adequate to demonstrate that the wells are <br />not endangering USDWs. The applicant has proposed a mor.~itorinq <br />program which covers both the individual injection wells and the <br />water quality and water levels in aquifers at the site. <br />Volumetric flow meters and density meters (probably neutron <br />type) will be installed on the production fluid flow line of <br />each solution mining well near the wellhead. One density <br />meter will be installed on the combined injection fluid flow <br />line immediately upstream of where it branches to feed all <br />solution mining wells. Separate density meters are not <br />required on the injection fluid flow line for eachdell <br />because the same fluid is used for all wells. All meters <br />will be equipped with continuous recording devices. The <br />mass balance may be performed on each well to demonstrate <br />that fluids have not migrated from the solution min:inq <br />cavity. The mass balance will also be used to estimate <br />cavity volume. <br />f~i <br />