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Mathews, Barbara
From: Fureigh, Brad N. <[email protected]>Sent: Tuesday, August 07, 2012 11:13 AMTo: Leamons, Bryan; Mathews, Barbara; Sadler, BillCc: [email protected]; Lee Tharp ([email protected]); Dan McCullough
([email protected]); Caldwell, Mike ([email protected])Subject: Eco Vista Pre-Application - Replacement Pages 22 & 23Attachments: Pre-Application (Replacement pgs 22 & 23).pdf
Bryan, In reference to your e‐mail dated May 31, 2012, attached are the two revised pages of the Pre‐Application (pages 22 and 23) regarding discussion of a possible void located at MW‐5R. No revisions were made to page 23, however by deleting the sentence on page 22 it caused some information on page 23 to move up, therefore page 23 is also included. Please replace pages 22 and 23 of the most recent Pre‐Application submittal with the attached pages. If you have any questions, please feel free to contact me at your convenience. Thanks! Brad N. Fureigh, P.E. Project Engineer I Solid Waste Services
Terracon 25809 I-30 South I Bryant, Arkansas 72022 P (501) 847 9292 I F (501) 847 9210 I M (501) 554 4547 [email protected] I terracon.com Join us on Facebook and LinkedIn
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Eco Vista, LLC Pre-Application ■ Proposed Lateral Expansion Revision 2 - April 2012 ■ Project No. 35097120
Responsive ■ Resourceful ■ Reliable 22
Joe Aquifer. The Boone-St. Joe rests unconformably on the Devonian-aged Chattanooga Shale. This shale unit is up to 70 feet in thickness and acts as a lower confining layer. The Boone residuum (or overburden) is generally characterized by alternating layers of clay and chert. In addition, weathered “pinnacles” of Boone Formation limestone can extend into the overlying residuum. The thickness of the residuum generally varies from 20 to 90 feet. The chert content of the residuum varies widely across the Landfill property. Some weathered chert zones contain little clay or limestone. These zones appear to have been originally composed of a chert and limestone mixture, mottled together similar to the competent bedrock of the Boone Formation. Over time the limestone dissolved away, leaving a porous chert matrix behind. Because of the relatively large porosity of these zones, they may be important avenues for groundwater flow and, above the groundwater table, for flow of landfill gas away from the active landfill. Previous subsurface investigations have noted several possible voids within the residuum above competent bedrock. The Boone Formation is a cherty limestone in which chert is present at nearly all horizons above the St. Joe member, while the St. Joe Member is easily recognized by its absence of chert. The upper Boone surface is less karstified with most features associated with a well karstified unit not developed in the upper Boone. Integrity of the upper Boone interval is further enhanced by the chert beds. The upper Boone was deposited in shallow water conditions that produced limestone beds of variable thickness. Single beds are usually less than five feet thick and commonly less than a foot thick. Chert replacement selectively followed those bedding planes leaving only thin intervals of limestone that were not thick enough to produce the features associated with a well karstified region. In particular, caves and sinkholes are much more commonly developed in the St. Joe interval where it is thick and near the land surface. At the Landfill site, the top of the St. Joe Formation is likely more than 200 feet below the existing ground surface. Competent rock pinnacles, encountered during both drilling and borrow area excavation at the site, extend into the overburden in several places. The groundwater table may be located within the alternating layers of chert and clay, the very porous weathered chert (epikarst zone), or the competent bedrock, depending on location. Groundwater flow is largely from the northwest to the southeast. However, based on hydraulic gradients, groundwater in small areas of the northwestern and northeastern portions of the landfill site likely has northerly flow components. The conceptual groundwater flow model at the Landfill property includes preferential groundwater flow pathways and provides parameters for predicting flow direction and velocity is complex and full of uncertainty. The saturated portions of the stratigraphy can be divided into two components based on groundwater hydraulic properties:
1. Overburden (Boone residuum) and Epikarst zone.
2. Competent limestone-chert bedrock (competent Boone Formation).
Eco Vista, LLC Pre-Application ■ Proposed Lateral Expansion Revision 2 - April 2012 ■ Project No. 35097120
Responsive ■ Resourceful ■ Reliable 23
Groundwater flow within the competent bedrock generally occurs within relatively small fractures which results in a relatively low permeability and slow groundwater flow rates. Groundwater flow in the overlying overburden and epikarst is more complex with areas of groundwater flow within:
Competent chert zones within small fractures which result in a relatively low permeability and slow groundwater flow rates;
Incompetent chert zones which consist of chert with a medium porosity. The porosity is a result of dissolution of limestone that was originally mottled within the chert. These zones likely behave similarly to porous media flow with an intermediate permeability and intermediate groundwater flow rates; and
Incompetent chert zones with large porosity. The porosity is created by limestone dissolution as described above. When these zones of large porosities are interconnected they result in fast groundwater flow rates.
The Eco-Vista Landfill site as a whole would be best described using the dual porosity model, with groundwater flowing through numerous small fractures or dissolution pores within the rock matrix, but with some discrete zones or preferential pathways transporting larger than average volumes of groundwater. These discrete zones are not uniformly distributed across the landfill site and some may be just above the water table, therefore transporting water only during periods of high groundwater levels. Evaluation of groundwater flow at the Eco-Vista Landfill through dye studies, aquifer testing, and groundwater velocity calculations using Darcy’s Law indicate that a significantly greater flux of groundwater moves through the epikarst than through the competent bedrock. A horizontal to vertical anisotropy ratio flow rate was calculated from the 2001-2002 dye test data at 53:1 (the overburden and epikarst versus the bedrock).
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Mathews, Barbara
From: Leamons, BryanSent: Tuesday, August 07, 2012 4:14 PMTo: Mathews, BarbaraSubject: FW: Eco-Vista, LLC - Land Ownership ResolutionAttachments: ADEQ Quiet Title Ltr 2012.pdf
Bryan Leamons, P.E. Engineer Supervisor ADEQ - Solid Waste Management Division 501-682-0601
From: Conrad, David [mailto:[email protected]] Sent: Tuesday, August 07, 2012 9:49 AM To: Leamons, Bryan; Matoska, Maria Cc: Tharp, Lee Subject: Eco-Vista, LLC - Land Ownership Resolution Dear Bryan and Maria, Please see the attached documents regarding the Fulton Equities property. As you will see, the ownership question has been resolved. Please move forward with your review of the Eco‐Vista Landfill Expansion Pre‐Application. Thank you and have a great day! Dave
David K. Conrad
Waste Management Market Area Engineering Manager - Arkansas Arkansas Tennessee Alabama Kentucky Market Area Two Pine Landfill 100 Two Pine Drive North Little Rock, AR 72117 (501) 982-7336 (Office) (501) 804-0806 (Cell) (501) 982-2606 (Fax) [email protected]
Waste Management recycles enough paper every year to save 41 million trees. Please recycle any printed emails.
Eco‐Vista, LLC 1041 Arbor Acres Avenue Springdale, Arkansas 72762 August 7, 2012
Mr. Bryan Leamons, PE Engineering Supervisor Solid Waste Division Arkansas Department of Environmental Quality 5301 Northshore Drive North Little Rock, Arkansas 72118‐5317
Dear Mr. Leamons,
Subject: Permittee and Facility Name: Eco‐Vista, LLC Landfill Expansion Pre‐Application – Land Ownership Question AFIN: 72‐00144; Permit #: 0290‐S1‐R2
Eco‐Vista, LLC (EVLF) is submitting this document to update the Department regarding a land ownership question that arose during the Department’s review of the Eco‐Vista, LLC Landfill (EVLF) expansion preapplication. The Department and EVLF have referred to the parcels in question as the “Fulton Equities” properties. The enclosed Order and Judgment Quieting Title demonstrates that Eco‐Vista is the lawful and record owner of the Fulton Equities property. This Order was signed by the judge for the Circuit Court of Washington, County on July 25, 2012. EVLF then filed the Order in the Washington County real estate records on July 31, 2012, which was recorded by the County in Real Estate File Number 2012‐00022475 (see last page of enclosed Order). Per the Order, Eco‐Vista, LLC is the official lawful and record owner of the two parcels (totaling 20.42 acres) formerly owned by Fulton Equities. This Order is a properly recorded legal instrument that proves EVLF’s ownership of the Fulton Equities properties.
For your convenience, we are also enclosing an exhibit, which illustrates the location of the parcels in question. Shepherd Engineering and Design Company (Johnny Mason, PE and LS) prepared the drawing.
Should you have any questions, please contact me at 501‐982‐7336 or email me at [email protected].
Sincerely, Eco‐Vista, LLC
David K. Conrad Engineering Manager – Arkansas enclosures cc: Lee Tharp – Eco‐Vista Landfill, District Manager
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