Laserfiche WebLink
Albert Frei & Sons, Inc. Page 3 <br /> Hatchery Pit Permit # M-2014-043 <br /> Revised 1/16/19) <br /> The following table shows the proposed trigger elevations for each well now <br /> that site specific information is available. On Stage 1 the trigger point <br /> elevations were based on plus or minus 2 feet of change. In Stage 2 the <br /> maximum is based on the maximum elevation measured, pre-dewatering, in each <br /> monitoring wells and added 2 feet . The minimum was picked as 1 foot above <br /> bedrock since there are no surface wells within 800 feet of the dewatering <br /> area that would be impacted. The water table is normally 30 plus feet below <br /> the surface. <br /> Table Gm1 <br /> MONITORING WELL MWO1 MW-02 MW-03 MW-04 MW-05 MW-06 MW-07 <br /> BEDROCK ELEVATION 5065.8 5064.7 5066.4 5063.1 5063.0 5047.3 5037.67 <br /> TOP OF LINER ELEVATION 5081.5 5082.0 5080.0 NA 5071.2 5068.4 NA <br /> BOTTOM OF FRENCH DRAIN 5078.0 5078.0 5076.0 NA NA NA NA <br /> ELEVATION <br /> TRIGGER ELEVATION MAXIMUM 5080.0 5082.3 5081.7 5068.7 5068.46 5067.5 5066.3 <br /> TRIGGER ELEVATION MINIMUM 5066.8 5065.7 5067.4 5063.94 1 5063.14 5062.57 1 5061.67 <br /> The possibility of adjusting the baseline ranges if needed in the future will <br /> be discussed between the Division and the operator at that time. The <br /> baseline range changes would be documented with a Technical Revision. <br /> If the groundwater levels in a monitoring well pass their trigger points for <br /> more than 3 months in a row, the operator will investigate to determine <br /> causes, and do mitigation as necessary. The operator will notify the <br /> Division of the trigger investigations and any subsequent mitigation. <br /> A neighbor complaint could also be a "trigger" . Examples of possible issues <br /> that may cause a trigger are: water well levels low, flooding fields, and <br /> vegetation suffering. Albert Frei & Sons would investigate to determine <br /> causes and mitigate if necessary as needed following the mitigation plan <br /> outlined below. <br /> Mitigation Plan. <br /> If the trigger is reached based on data collected, the following <br /> actions should be undertaken: <br /> • An evaluation of the data to confirm that Albert Frei & Sons, Inc. <br /> (Frei) is responsible for the change shall be completed. <br /> • Implementation of mitigation measures . <br /> Mitigation measures that could be implemented (not necessarily in the order <br /> listed) include: <br /> Up Gradient Mitigation <br /> • In Stage 2 an inspection of the surface groundwater diversion drain <br /> (French Drain) on the outside the compacted liner will be done . If it <br /> is found there is a problem with the drain it will be cleaned or <br /> repaired as needed to preserve the drainage. <br /> Down Gradient Mitigation <br /> • Well improvements . Affected surface water wells could be deepened to <br /> bedrock or modified to increase yield. Alternatively, new alluvial <br /> wells could be constructed to provide a new water supply. <br />