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Lyons Quarry <br /> 112d Reclamation Permit Operations <br /> Technical Revision <br /> The runoff control channel that ran along the west perimeter of the quarry will be realigned to convey <br /> drainage through the reconstructed swale of Quarry 2 into the catchment basin of Quarry 1 (shown <br /> in Attachment B). Channelizing and capturing surface runoff within the quarry area would further <br /> reduce impacts to areas outside of the already impacted mining activity. Flow will then be directed <br /> through the swale and scour berm in Quarry 1 via a 24-inch reinforced concrete pipe (RCP) culvert. <br /> The culvert outlet will tie into the drainage channel at the toe of the scour berm and direct flow to the <br /> east. The culvert is necessary to prevent the retention of water within the catchment basin. However, <br /> if plans for the future use of the site change, this catchment basin could have the ability to become a <br /> retention pond as proposed in the Kleinfelder report. <br /> The runoff control channel on the east perimeter of the quarry will remain as previously designed, <br /> running along the existing access road grade and tying in with the scour berm toe drainage channel <br /> before discharging through a 24-inch RCP culvert running under the site access road to South Saint <br /> Wain Creek. This culvert would represent a new discharge point for the site but is needed to convey <br /> stormwater under the site access road. <br /> 3.6 Scour Berm Realignment <br /> The toe areas of fill slopes that extend into the low-lying areas and the floodway of South St. Wain <br /> Creek will be protected from scour by future flood events by the construction of a "self-launching" <br /> riprap scour berm. The self-launching term refers to the ability of the riprap comprising the scour <br /> berm to fill in undermined sections that may be impacted during a flood event. The scour protection <br /> is designed to withstand a minimum 100-year flood event. The riprap gradation for the scour berm <br /> has a Dso of 28 inches and a maximum stone size of 42 inches. The compressive strength <br /> specifications of the riprap will allow for the white sandstone layers of Lyons Quarry to be used as <br /> sources. <br /> The scour berm feature specified in M-1977-141, Technical Revision #2 to protect the base of the <br /> quarry at the floodplain boundary would, for the most part, remain in place as part of this revised <br /> reclamation plan. Sections in M-1977-141, Technical Revision #2 where the berm becomes a stand- <br /> alone trapezoidal shape would be moved to the south and would be built against the new swale <br /> berm in Quarry 1 (Attachment B). Relocating this section of the scour berm would greatly reduce the <br /> amount of required riprap material and maintain the existing parking area of Lyons Quarry for public <br /> use in the future. <br /> 3.7 Site Restoration <br /> As specified in Technical Revision #2, slopes for the revised plan that are steeper than 2H:1 V will be <br /> revegetated either by using straw mulch and crimping or hydro mulching methods while also <br /> receiving an appropriate seed mix and necessary organic amendments (Attachment C). Slopes <br /> steeper than 2H:1 V will mostly consist of rock faces that will not support vegetation; therefore, these <br /> slopes will not be revegetated. Available onsite topsoil sources will be utilized where needed but any <br /> additional topsoil and fine sediment material, including those from the floodplain area, would be <br /> assessed for utilizing offsite at municipal or State projects. <br /> The focus of revegetation will be native plant species, adapted to the area climate, that require no <br /> irrigation. A native plant seed mix was developed in consultation with a BCPOS ecologist for <br /> March 2021 1 13 <br />