4 years ago

Preliminary Engineering Report - Fauquier County

Preliminary Engineering Report - Fauquier County

2. Irrigation

2. Irrigation Application The current landfill MSW cell configuration is made up of 4 existing cells and 1 cell to be constructed in the near future. Each cell is constructed to include a double liner system to collect leachate as it is generated, to prevent release to the surrounding groundwater or surface waters. As debris and daily soil cover are added to the cell, side slopes are generated which need to be stabilized to prevent slope erosion and provide dust control. Fast growing grasses are applied by the hydro seeding process. The new treatment / reuse process will provide water for all areas within the cell including potentially the side slope areas to enhance the stabilization and vegetation growing process. In a workshop meeting with DEQ to discuss onsite irrigation uses, DEQ indicated that the initial stage of irrigation should be planned only for the lined areas of the site. In the future, the landfill wishes to pursue opportunities for irrigation in unlined portions of the site, but will coordinate with DEQ in advance and establish application rates and monitoring programs to ensure proper management of this potential future use is established. For the purposes of this report, an allocation of 10,000 gallons per day of irrigation over lined areas is assumed. 3. Posi-Shell Production (Alternative Daily Cover) As required by the solid waste regulations, the landfill must apply a daily cover material to the working face of the cell to minimize windblown dust and debris. A layer of earth is placed once a week and a material known as Posi-Shell at the end of each work day. The primary components of Posi-Shell are mineral binders reinforced with structural composite fibers. This base material is mixed with water and sprayed from hydro seeder type equipment to prevent windblown debris, this process is estimated to consume 2,200 gallons per day. 4. Potential Additional Future Use Fauquier County is in the conceptual planning phases for an adjacent property which is known as the Stafford Property. This site may have a future bus wash facility for County school busses and the potential use of reclaimed water may be considered in the future for this purpose. At the time, however the Stafford property is only in the planning stages and any potential use for reuse would be expected to be at least several years in the future. Based on the near term uses identified for the landfill site, Table 6 summarizes the intended uses and daily volumes anticipated: N:\18469-000\Engineering\Reports\April 2012 PER\18469 PER Treatment System 7-31-2012_AM.docx Page 9

TABLE 6 Anticipated Daily Application Rates for Reuse Reclaimed Water Use Water Consumption (gallons/day) Dust control of roadways 14,200 gallons per day Posi-shell production 2,200 gallons per day Irrigation over lined areas 10,000 gallons per day has been allocated (Note: Rates and quantities will be established with DEQ) Total Reclaimed Water Consumption 26,200 Total gallons per day Based on the identified reuse applications onsite, all of the intended uses for Phase I would fall within the requirements of Level 2 standards identified in the Virginia Water Reclamation and Reuse Regulations. The future bus wash facility mentioned as part of Fauquier County’s potential Stafford property development is the only potential use that would be considered a Level 1 quality requirement. As such, it is proposed to pursue a Level 2 reuse quality initially for Phase I with the ability to reclassify the water in the future if the future uses dictate upgrading the criteria to Level 1. V. EXISTING AND FUTURE INFLUENT FLOWS As discussed previously, the influent leachate varies in quantity with precipitation. In the last three years, the annual average daily flow of treated leachate hauled offsite has varied from 5,140 to 8,702 gallons per day. There are two additional uses that have been identified at the facility as follows: 1. Restroom Facilities for Landfill Site Staff As part of the Phase I landfill treatment facility upgrade, three remote mobile restrooms will be installed, each having a dedicated grinder submersible pump station. All three restrooms are estimated to generate a maximum of 750 gallons per day of sanitary flow. This flow will be blended with the leachate waste stream prior to entering the treatment equipment. Installing these facilities will allow the landfill to remove the existing “Port-a-Johns” from the landfill site. This will also improve the existing sanitary conditions at the facility. 2. Future Fauquier County Stafford Property Development Fauquier County is in the conceptual planning stages for the adjacent Stafford Property. This property will potentially contain County and State administrative and maintenances staff. The County is a few years away from approving the master plan for the property, so ultimate build- N:\18469-000\Engineering\Reports\April 2012 PER\18469 PER Treatment System 7-31-2012_AM.docx Page 10

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