News and Events

Pond at Northerly Island

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Island between Burnham Harbor and Lake Michigan, Downtown Chicago, Illinois OWNER: City of Chicago Parks Department GC: FutureNet Group ENGINEER: US Army Corps of Engineers PROJECT REVENUE: $500,000.00 +/- PROJECT TIME PERIOD: December 2010 – May 2011 THE CHALLENGE Excavate a pond up to 18 feet deep with dimensions of 1,700lf x 300lf at the widest point. Pond is a   …Continue Reading

Septic Tank Install Project History

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Griffin recently completed a project in Belvidere, IL for an excavating company working at an RV park. There were two large septic tanks being installed, one that is 40’ x 15’ x 12’ deep and the other one 20’ x 10’ x 10’ deep. The challenge that the excavating company faced was to install the   …Continue Reading

Belews Creek Project History

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Griffin completed a successful delivery of dewatering for Belews Creek Steam Station Overlay owned by Duke Power Energy. AECOM served as engineer and Phillips & Jordan, Inc. was the general contractor. The project consisted of construction of a seepage collection filter system as part of slope stability of the existing dam approximately ±1900ft long by ±130ft wide and   …Continue Reading

Court Ruling Helps Clarify Timing of CCR Rule Violations

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Recently, a North Carolina court ruled that CCR closure plans cannot be found in violation of the CCR rule until the plan is implemented. As the planning process continues, many stakeholders are engaged in identifying the most environmentally friendly and cost-effective closure plans. When it comes to groundwater control, interstitial water removal, and treatment of   …Continue Reading

Your Coal Ash Dewatering Resource

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Lately, there have been numerous workshops with presentations that focus on CCR water management. Griffin has a wide range of dewatering experience including the installation of deep well, wellpoint and eductor dewatering systems.  We’d like to provide some additional information on eductor dewatering systems as eductors are not normally discussed during these water management presentations.   …Continue Reading

Project History: Chicago Elevator Pit

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This project history examines dewatering performed for a new elevator pit in an existing basement in Chicago. Locked-Up Storage tried to dewater two feet of water by sumping with no success. Griffin installed sanded wickpoints to a depth of eight feet and ran a discharge hose up a vent shaft to discharge outside of the   …Continue Reading

Construction Site Dewatering: Techniques and Solutions

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Having a proper construction dewatering plan is imperative to keeping your project on schedule and on budget. Construction dewatering can be very challenging and normally includes the removal, treatment and discharge of groundwater and storm water. Numerous Griffin Dewatering project sites were recently featured in Pile Buck magazine’s cover story on construction site dewatering. Below   …Continue Reading

Griffin Dewatering Discovers Two Centuries-Old Ships

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Griffin has successfully completed phase one of a complicated two-part project on the waterfront in Alexandria, VA where two centuries-old ships were discovered by archeologists. (New York Times) “The bottom line is that we would not be where we are today in our archeological studies if it wasn’t for the dewatering system.” – EYA Superintendent   …Continue Reading

Uplift Pressure Calculation

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Uplift Pressure Calculation / Artesian Reduction System / Relief Well Design When there is an impermeable layer between the bottom of the excavation and a deep aquifer (see Figure below), the ground water head at the aquifer below the subgrade might be sufficiently high to cause soil layers to lose strength and fail. In this   …Continue Reading

3 Tips for Construction Risk Management

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This article from Connect & Construct contains three helpful tips to keep in mind when managing your construction risk. We have provided some commentary with each one. Manage construction safety: “When it comes to construction safety, having the information you need organized and readily available at your fingertips can avoid a lot of common safety   …Continue Reading

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