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EXHIBIT C-4 <br /> Van Valkenburg Quarry <br /> Storm Water Management Plan <br /> aWlwIJ <br /> I'�" MEMORANDUM <br /> CONSULTl1NTS,INC. <br /> Project 16PO39 <br /> TO: Kent Holsinger—,I±olsinger Law LLC <br /> FROM: Edwin Friend, ., P.G. — RJH Consultants, Inc. <br /> DATE: June 20, 2016 <br /> RE: Van Valkenburg Quarry Storm Water Management Plan <br /> Introduction <br /> The Van Valkenburg Quarry (Quarry) is a proposed rock quarry in Jackson County south of <br /> Walden, Colorado. The purpose of this memorandum is to provide recommendations for the <br /> storm water management plan for the Quarry. <br /> Based on conversations with Jackson County personnel, we understand that Jackson <br /> County does not have local guidelines for site-specific storm water management practices. <br /> Storm Water Management Practices <br /> The area that will be mined is an existing rock outcrop that will be lowered in elevation. <br /> Limited soil materials will be disturbed during mining and therefore sediment transport from <br /> storm water should be minimal. Storm water management would be controlled with various <br /> Best Management Practices (BMPs) depending on the site geography and erodibility of the <br /> materials onsite. The BMPs would be developed based on guidance from the Colorado <br /> Department of Transportation Erosion Control and Storm Water Quality Guide, and the <br /> Environmental Protection Agency Industrial Storm Water Fact Sheet Series for Sector J: <br /> Mineral Mining and Process Facilities. <br /> During mining activities BMPs would include: <br /> • A gravel tracking pad on the haul road near the edge of the affected area. <br /> • Stockpiled soil and topsoil that will not be used within a mining season will be seeded <br /> to stabilize the stockpiles. <br /> • Where there is a potential for storm water to erode material off of the site, sediment <br /> control measures will be installed that could include a combination of berms, silt <br /> fence, or erosion control logs. <br /> • Site grading would be maintained so that concentrated drainage that could result in <br /> scour does not occur. <br /> BMPs for final site reclamation would include: <br /> • Seeding of disturbed areas <br /> • Site grading would be developed so that concentrated drainage that could result in <br /> scour does not occur. <br /> H:IPROPOSALSMP03M-20-16_Storm—water_management_Mernmandum doc <br />