Midshore Landfill – Easton, MD, USA

by Platipus Inc | Aug 23, 2022

Case Study

Midshore Landfill – Easton, MD, USA

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Project Overview

Maryland Environmental Service (MES) owns and maintains the Midshore Regional Solid Waste System in a region that serves 140,000 residents on the eastern shore of Maryland’s Chesapeake Bay. The 175 acre (708,200m²) Midshore I closed in 2010 after operating successfully for 20 years. MES chose to cover the landfill with an Exposed Geomembrane Cover (EGC.) Designed to protect the environment and minimize the need for ongoing maintenance, the EGC also allows for future use of the landfill.

Solution

The EGC design specified an HDPE 60mil (1.5mm) geomembrane liner secured with Platipus Percussive Driven Earth Anchors (PDEA^®) as a cost-effective and easily installed alternative to traditional vertical trenching. The Platipus anchor assembly was manufactured with components to meet the holding capacity and 20-year design life required by Geosyntec Consultants/MES in this highly corrosive environment. The anchor was driven through the liner and into 4-5 feet (1.2 – 1.5m) of compacted waste. The pull out resistance was then field tested to meet the engineered wind and LFG uplift requirements of 1,800 lbs (8kN). Once the anchor assembly was fully installed and tested, a HDPE patch was placed over to create an impermeable system.

Geomembrane Cover – Cantonment, FL

by Platipus Inc | Aug 1, 2022

Case Study

Geomembrane Cover – Cantonment, FL

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Project Overview

Engineers were expanding the Perdido Landfill in Florida’s Escambia County to add a new cell adjacent to an existing cell, eventually connecting the two. They were challenged with designing a temporary V-ditch between the cells while the new cell was being excavated. The function of the temporary 3,000′ long ditch was to collect and convey stormwater from the existing nearly closed cell to the facility’s detention ponds.

Solution

The proposed design included a 60mil textured HDPE exposed liner secured with the Platipus S2 ARGS^® Geomembrane Liner Anchor to protect the temporary stormwater structure. Wind and hydraulic uplift calculations mandated 2′ deep longitudinal anchor trenches along the edges of the 16′ wide V-ditch. The S2 ARGS^® Geomembrane Liner Anchors were installed and load locked at a minimum depth of 24” on 10′ centers down the centerline of the V-ditch and tensioned to 200 lbs. The specified anchor assemblies included a Grade 316 stainless wire tendon, UV-stabilized HDPE load plate extrusion welded to the HDPE liner, and a corrosion resistant brass self-setting wedge grip.