2016-06-09_REPORT - M1999120 - Laserfiche WebLink

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DRMS ANNUAL REPORT - GROUNDWATER MONITORING REPORT SITE: L.G. Everist, Inc. - Fort Lupton Sand and Gravel, M-1999-120 DATE: June-2016 Page 2 of 2 MW11, MW12, MW13, MW16 - These wells are located in and around areas which have been released from the DRMS permit, and so are now within the City of Aurora's reservoir properties. L.G. Everist does not have access to them. MW14 - The groundwater has dropped below the baseline level, however this well is clearly internal to LGE, as it is located in the southeast section of the Parker-Panowitz cell. Changes in groundwater levels around this well would only affect LGE, therefore no mitigation is-necessary. Note that the nearest external well, MW45 (located just north of the Parker-Panowitz slurry wall) is in compliance. MW21, MW22, MW 23, MW24 - These wells are all located along the eastern side of the Sandstead phase and are considered internal to LGE operations. All four wells were outside baseline ranges in the beginning of 2015, when we were mining the south-half of the Sandstead phase, but have come back into baseline ranges since the area was converted into a settling pond. MW23 was destroyed due to mining operations in fall-2015. The conversion of the south-half of the Sandstead phase into a settling pond is considered mitigation on our part as it is recharging the groundwater in the area and bringing water levels in the wells back into baseline ranges. And because the wells are internal to LGE operations and water levels would only affect the operator, no other mitigation is necessary. Note that the nearest external well, MW20, located on the west side of Sandstead, has stayed within baseline ranges. MW25 - This well fell slightly outside of baseline ranges in early 2015, possibly due in part to the dewatering and mining in the south half of Sandstead, but also the on-going dewatering by the adjoining mine to the north. MW25 is located at the northeast corner of Sandstead, just across CR18 from the neighboring mining operation mentioned in MW8 and MW9. The water levels in MW25 have come back into baseline ranges. No residential neighbors were affected. MW49, MW50 - These two wells are located within the confines of the Vincent West slurry wall liner. Therefore, they are internal to L.G. Everist operations. They have fallen slightly below baseline ranges, but that is to be expected being inside a slurry-walled reservoir. Changes in water levels in these levels would only affect the operator, there is no impact to residential neighbors, so therefore no mitigation is necessary. As mentioned above, all other existing wells are within baseline ranges. Also, as noted above, L.G. Everist has investigated the data and compared monitoring well results with their locations and nearby activities, whether LGE or neighboring mining operations. Most wells that have fallen outside of baseline ranges are internal to LGE operations, and are not affecting anyone but LGE, so therefore no mitigation is necessary. As MW8, MW9 and MW25 are the only external wells that are outside of baseline ranges and are extremely close to our neighbor's dewatering operations, the cause is apparent. The lower water levels are not having an adverse effect on any residences and certainly not on the mining operations. As LGE is not the cause of the groundwater decrease in these three wells, mitigation is not required on our part. We will continue to monitor our wells on a monthly basis. FL-DRMS-AnnRpt&GrwtrMon-2016-060316.docx