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2022-12-22_REVISION - M1987164 (17)
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2022-12-22_REVISION - M1987164 (17)
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Entry Properties
Last modified
12/28/2022 9:38:48 AM
Creation date
12/27/2022 5:05:36 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1987164
IBM Index Class Name
Revision
Doc Date
12/22/2022
Doc Name Note
Exh G
Doc Name
Request For Amendment To Permit
From
Oldcastle SW Group, Inc. dba United Companies
To
DRMS
Type & Sequence
AM4
Email Name
HR1
MAC
AWA
Media Type
D
Archive
No
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'�® <br /> EXHIBIT G 01< WATER INFORMATION <br /> 1 . General <br /> Surface water features near the Hayden Gravel Pit include the unnamed drainages interweaving <br /> the various mining areas. Wetlands are present within these drainages. Disturbance of these <br /> wetlands will occur to create the internal access haul road. Permitting of this wetlands <br /> disturbance is discussed in Section 4 below. These features can be seen in the Exhibit C and F <br /> maps; Map G-1 shows the drainage basins and patterns for the site in premine, mine, and <br /> reclaimed conditions. Groundwater is below the bottom of mining as none has been <br /> encountered during exploration or past mining operations and adjacent wells are installed below <br /> the bottom of mining. There is no risk of flooding according to the Federal Emergency <br /> Management Agency (FEMA) flood mapping services; the flood zones for the Yampa River do <br /> not reach this site. No wells are located on any area that is intended to be mined. Local wells <br /> are located far enough from mining horizontally and vertically to be unaffected by mining <br /> operations. United Companies is committed to maintaining the prevailing hydrologic balance <br /> during their operations. <br /> 2. Water Quality Protection <br /> The primary concerns surrounding water quality protection at the Hayden Gravel Pit site are the <br /> potential impacts to the surface and groundwater from sediment, hydraulic fluids, and diesel <br /> fuel. Sediment will be controlled through the use of stormwater retention within the disturbance <br /> area through the life of the mine. The site will be graded in a manner that maintains all surficial <br /> flows within the disturbed area, in turn containing all sediment and unwanted discharges from <br /> leaving the site. Surface water control methods are discussed in the site Stormwater <br /> Management Plan (SWMP) which is currently approved and in place. Stormwater control <br /> measures such as berms and sumps can be seen on Map C-2 and Map G-1. The SWMP will be <br /> updated to reflect the changes in this amendment following approval by the CDRMS. <br /> Hydraulic fluids and diesel fuels will be contained within vehicles or with adequate storage <br /> methods that follow best practices of maintenance; these practices including regular inspections <br /> of vehicles, hydraulic lines, and any other potential spill sources. Diesel fuel will be stored on- <br /> site in double walled tanks with secondary containment. Fuel storage will be stored away from <br /> exposed groundwater and other waterways. Spill kits will be located near all fueling areas to <br /> clean up inadvertent spills as soon as possible. An SPCC plan will be in place to prevent oil <br /> discharges and establish a response procedure in the event of spills. <br /> Any surface water discharges of stormwater from the site will be sampled in accordance with <br /> the NPDES discharge permit. The discharge permit requires sampling at all outfall locations <br /> which are identified in Map C-2. This permit is approved and in place for the current discharge <br /> outfall at Pod 1 but will be amended prior to discharges from the new pits. <br /> Hayden Gravel Pit <br /> December 2022 G-1 Lewicki&Associates <br />
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