2021-03-05_REVISION - M1977141 - Laserfiche WebLink

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Lyons Quarry S �� 112d Reclamation Permit Operations F Technical Revision The actual location of the restoration test plots will be determined by the Quarry reclamation sub- contractor and based on the operator's earthwork schedule and re-grading plan. The specifications will require that the sub-contractor develops test plots with similar elevations and aspects as the planned reclamation. The test plots will have 30-footx30-foot dimensions with two variables per plot, or two 15-footx30-foot subplots. There would be a total of four(4) test plots, or eight(8) total subplots. The test plots will be seeded in the spring of 2021 once the ground surface is exposed and there is sufficient moisture to obtain germination. The test plots will be monitored periodically throughout the reclamation of the Quarry. The plots and plants would be photographed, and a vegetative survey conducted to include plant type, plant height, plant density, overall, vegetation density, and presence of weeds. Monitoring would also include general observations such as evidence of erosion and pest issues. Soil samples would be collected in the fall for routine soil nutrient assessment, including major plant nutrients and micronutrients. Aggregate Industries may also conduct a bench-scale study that could allow the start of reclamation activities sooner than the proposed 12-month schedule. The bench-scale study would supplement the field plot information. By growing indoors, faster germination and vegetative growth can be achieved. 9.2—Soil Conditioning All reclamation areas within the floodplain will be reclaimed in a manner that allows for livestock grazing. These areas will be backfilled as described above, then covered with a layer of growth medium material. The growth medium material will be developed from a blend of any available topsoil stockpiled on site and material available from the excavation and breakdown of the fine- grained sedimentary overburden rock, supplemented as needed by imported topsoil, biosolids, or compost, then blended, scarified, seeded and mulched. The materials will be transported using front end wheel loaders or articulating haul trucks. This material will then be uniformly spread and mixed with conventional earthmoving equipment, such as dozer rippers or the teeth of an excavator bucket, into the top 12 inches of the subsoil. For the Area 1 reclamation it is anticipated that the soil conditioning area covers approximately 37.2 acres. Imported soil amendments shall be from a local source of material to be generated during test plot development and reclamation. Caked or lumpy soil amendments will not be accepted. If selected as the preferred source, manure shall be dry cow, horse or sheep manure that has been stockpiled a minimum of one (1) year. Manure shall not be so caked or lumpy that it cannot be spread uniformly. Compost manure shall be stabilized through at least one heating cycle (120 to 140 F degrees), turned at least once, and windrowed for at least 45 days and stockpiled for a least 2 months. Biosolids or compost biosolids, containing municipal biosolids, shall meet Colorado Department of Public Health and Environment Water Quality Control Commission 5 CCR 1002-64 Biosolids Regulation No. 64, including permitting and regulatory approval procedures. Soil amendments shall not contain pathogens or toxic materials harmful to human health or vegetation growth. 9.3— Revegetation It is anticipated that the revegetation of Area 1 covers approximately 37.2 acres. Seeding of the reclaimed areas assumes a native seed mix comprised of the species and mixtures recommended by Boulder County Parks and Open Space with updates provided in December 2019 by Senior Plant March 2021 1 19