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2014-10-28_HYDROLOGY - M1998013
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2014-10-28_HYDROLOGY - M1998013
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Last modified
9/8/2020 9:43:25 PM
Creation date
10/30/2014 7:36:42 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1998013
IBM Index Class Name
Hydrology
Doc Date
10/28/2014
Doc Name
Groundwater Mitigation Plan
From
Bestway Concrete & Aggregate
To
DRMS
Permit Index Doc Type
Hydrology Report
Email Name
ECS
Media Type
D
Archive
No
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Table 2 <br /> SE Pond E Pond D NE Pond E Pond B <br /> Date NW-Well SE-Well MW 3 MW 4 MW 5 <br /> (feet (feet <br /> (feet below (feet below below (feet below below <br /> grade) grade) grade) grade) grade) <br /> Average 7.15 7.01 19.25 7.75 6.37 <br /> Max 9.75 8.17 19.67 9.67 6.75 <br /> Min 6.58 6.33 18.42 6.08 6.00 <br /> Potential Groundwater Impacts <br /> Originally the Burch Site was proposed to be dewatered, mined and reclaimed after construction of a slurry wall. <br /> Bestway has changed its plans and is now proposing to dewater the site,wet mine the site and backfill or leave one <br /> cell open completed with a compacted clay liner to be used as a small augmentation pond. The proposed method of <br /> mining could potentially cause some drawdown in the surrounding alluvial wells and in the event a cell is lined with <br /> clay it could cause some mounding on the west side of the site. The clay lining could cause a small shadow effect on <br /> the north and east. Existing water levels from borings done in 2004 on the Shores Pit indicate that water is 8 feet to <br /> 11 feet below ground surface. The current observed water levels in the wells are shown in Table 2 above. <br /> Groundwater Mitigation Plan <br /> Figure 2 shows the wells and potential residence with domestic wells and basements. The groundwater currently <br /> flows northeast with a potential shadow effect on the east side of the site and a mounding effect on the west side of <br /> the site. <br /> The initial impact from mining could potentially cause a reduction or increase in water level of the surrounding wells <br /> due to dewatering or mounding. The majority of the wells are on the mounded side of the Site(west side)and there <br /> are three permitted wells on the shadow side of the site(east side). There are three residences that have basements <br /> on the mounded side of the site(west)as shown on Figure 1. These residence were built in early 2000 and they are <br /> located next to monitoring well 5. Monitoring well 5 has an average depth of 6.4 feet below ground which would <br /> indicate that the groundwater is already within the basement elevation and sump pumps and underdrain systems <br /> should already be in place to mitigate groundwater. <br /> Bestway proposes to follow the below steps in determining if they have caused a negative impact to groundwater <br /> levels due to mining: <br /> • Meet with the affected well owner and determine the best course of action. <br /> • Monitor the water levels in nearby monitoring wells and the affected well. <br /> • Collect all necessary data to move forward on a solution. <br /> • Table 3 below presents the site standard deviation for the well water level minimum and max variation(i.e. <br /> the max water level fluctuation (variation)). Using these parameters in Table 3,the maximum variation plus <br /> one standard deviation as an initial trigger in determining the appropriate mitigation measures of the <br /> affected well. <br />
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