2020-05-08_PERMIT FILE - M2020007

Home Browse Search

ENVIRONMENT, INC. PAGE S L.G. EVERIST, INC. - RAGSDALE RESERVOIR ADEQUACY RESPONSE ❑1 MAY 6, 2020 Please provide a table/figures showing all available water level monitoring data and trends over time for the monitoring wells listed. Attached is the most recent data collected from the monitoring wells-through March-2020. Depths to water shown in this table are from the ground's surface. DRMS acknowledges the difficulty in establishing appropriate trigger levels for mitigation in a large area with numerous external influences and large seasonal variations . To help mitigate these issues, minimize the impacts to the hydrologic balance, and/or demonstrate that the permittee has successfully addressed any reported impacts, it is vital to determine what the existing "pre-mining" conditions are for nearby wells that may be impacted. Therefore, in addition to the required five quarters of pre-mining water level data, DRMS will also require the permittee to attempt to document background conditions in the seven allu- vial wells within 200 feet of the site shown in Table G-1 prior to initiating dewatering activity associated with this permit . This data is especially important for this site, where mining activity may have the potential to adversely impact nearby alluvial wells . Wells shown on the provided map as owned by Bangert/Evans, Pacheco, and Castle Pines are all immediately adjacent to unlined mining areas, and are of particular con- cern/interest . For the seven listed shallow wells, DRMS will require that the permittee attempt to obtain the following data, in addition to whatever basic well construction data is currently available : • Total well depth, • Depth to static water level, • Depth of pump intake • Conduct pump test to determine well yield • Conduct analytical sampling of all Domestic Drinking Water parameters All data collection will be completed at the permittee' s expense. Data will be provided to DRMS and the well owner upon their request . If a well owner chooses not to allow the permittee access to collect the above data, they should be provided with a form that they can sign and date to document that they have been provided with an opportunity to have their well characterized at the permittee' s expense, but have chosen to decline to partici- pate . Thank you for the information on the additional requirements. I have spent time reviewing the well list again and have found that there were some corrections that needed to be made to the list. I forgot to make a correction to the well table and map when we revised the permit area. I am assuming that the 7 wells you note are the non-Cannon Land wells located outside the permit boundary. The changes in particular are as follows: