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Preliminary Engineering Report - Fauquier County

Preliminary Engineering Report - Fauquier County

Table of Contents I.

Table of Contents I. EXECUTIVE SUMMARY .......................................................................................................................... 2 II. PROJECT BACKGROUND ........................................................................................................................ 4 III. VIRGINIA WATER REUSE STANDARDS................................................................................................... 7 IV. PLANNED WATER REUSE ACTIVITIES .................................................................................................... 8 1. Roadway Dust Control .................................................................................................................... 8 2. Irrigation Application ...................................................................................................................... 9 3. Posi-Shell Production (Alternative Daily Cover) ............................................................................. 9 4. Potential Additional Future Use ..................................................................................................... 9 V. EXISTING AND FUTURE INFLUENT FLOWS .......................................................................................... 10 1. Restroom Facilities for Landfill Site Staff ..................................................................................... 10 2. Future Fauquier County Stafford Property Development ........................................................... 10 VI. DESIGN CRITERIA ................................................................................................................................ 11 VII. PROPOSED TREATMENT SYSTEM ........................................................................................................ 12 VIII. PLANNING LEVEL FACILITY COSTS (Phase I) ........................................................................................ 15 APPENDIX A: TREATMENT EQUIPMENT .......................................................................................................... Influent Pre-Screening ............................................................................................................................. Membrane Bioreactor Treatment System .............................................................................................. UV-Disinfection Equipment ..................................................................................................................... Irrigation/Reuse Pump Station................................................................................................................ APPENDIX B: FIGURES. .................................................................................................................................... Figure P-1: Process Flow Diagram ........................................................................................................... Figure C-1: Overall Landfill Facility Plan .................................................................................................. Figure C-2 Dust Control / Irrigation Plan ................................................................................................. Figure C-3: Leachate Treatment Facilities ............................................................................................... Figure M-1: Leachate Treatment Mechanical Layout ............................................................................. N:\18469-000\Engineering\Reports\April 2012 PER\18469 PER Treatment System 7-31-2012_AM.docx Page 1

I. EXECUTIVE SUMMARY The Fauquier County Department of Environmental Services owns and operates the Corral Farm Landfill in Fauquier County, located just outside of the Town of Warrenton, Virginia. The facility accepts municipal solids waste (MSW) and has on-site construction and demolition (C&D) receiving/ processing and a material recycling facility. The landfill generates leachate which varies in quantity depending on precipitation. In recent years, the average quantity of leachate generated ranges from 5,000 to 8,000 gallons per day with up to 15,000 gallons per day during wet weather periods. Currently, leachate is pretreated in a biologically aerated basin (Pond #2) and hauled offsite by truck for final disposal to either local municipal wastewater treatment plants or at the privately owned RECO Biotechnology facility in Richmond. Hauling of the leachate for offsite final treatment and disposal poses significant annual costs to the County. As such, the County is seeking alternative disposal options to offset these costs. Since the landfill is located within the Occoquan River Sewershed it is subject to the requirements of Virginia Department of Environmental Quality (DEQ) Occoquan Policy (VR680-11-05) which eliminates the ability to construct a surface water discharge from the leachate treatment facility. The objective of this project is to develop a leachate treatment and management facility to produce an effluent quality that will enable the landfill to reuse the treated leachate for onsite needs and all together eliminate the need to haul leachate offsite for further treatment. Virginia has developed two quality standards for treated municipal and industrial wastewater reuse depending on the end use. Level 1 standards are more stringent and are suitable for contact by the public. Level 2 standards are less stringent and are not intended for contact by the public. The parameters for municipal wastewater reuse are published in the Virginia reuse standards, but for the treated leachate, DEQ will likely require additional treatment parameters which will require additional treatment of the current pre-treated leachate. The landfill has established three initial onsite uses (Phase I) for treated leachate as follows: Dust Control: Treated leachate will be used for dust control by applying the treated water with trucks that will traverse the onsite roadway area around the landfill cells and adjacent work areas. Irrigation: A spray irrigation system will be installed over lined areas of the landfill. “Posi-shell” Production: Posi-shell is a material used for providing daily cover over the landfill and will utilize the treated leachate mixed with fibrous material. In future years, treated leachate water may potentially be utilized for a bus washing facility as part of a future development by Fauquier County on the adjacent Stafford property. The bus wash facility is the only identified use that will require meeting Level 1 water reuse standards. Based on the identified uses, the project intends to pursue Level 2 standards in the final design, but will plan to install a N:\18469-000\Engineering\Reports\April 2012 PER\18469 PER Treatment System 7-31-2012_AM.docx Page 2

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