--- title: Keeping it Clean in Washington D.C. With STELCOR - IDEAL Foundation Systems description: Discover how STELCOR overcame logistical challenges to support the Clean Rivers Project, enhancing the wastewater system in D.C. Learn more here. image: https://www.idealfoundationsystems.com/hubfs/Imported_Blog_Media/DC-SEWER-2-150x150-1-1.jpg --- [Skip to main content](https://www.idealfoundationsystems.com/blog/keeping-clean-washington-d-c-stelcor#maincontent) [ «  View All Posts ](https://www.idealfoundationsystems.com/learning-center/) # Keeping it Clean in Washington D.C. With STELCOR February 11th, 2021 1 min read By [Bruce Stroyer](https://www.idealfoundationsystems.com/blog/author/bruce-stroyer) ![](https://www.idealfoundationsystems.com/hs-fs/hubfs/Imported_Blog_Media/DC-SEWER-2-150x150-1-1.jpg?width=150&height=150&name=DC-SEWER-2-150x150-1-1.jpg) **OVERVIEW:** The Clean Rivers Project is DC Water’s ongoing program to reduce combined sewer overflows into the District’s waterways. The Project is a massive infrastructure and support program designed to capture and clean wastewater during rainfalls before it ever reaches the rivers. The project is comprised of a system of deep tunnels, sewers, and diversion facilities to capture combined sewer overflows and deliver them to a wastewater treatment plant. ![](https://www.idealfoundationsystems.com/hs-fs/hubfs/Imported_Blog_Media/DC-SEWER-2-1024x576-1.jpg?width=1024&height=576&name=DC-SEWER-2-1024x576-1.jpg "DC-SEWER-2-1024x576") **CHALLENGE:** This particular section of tunnel runs down the center of a busy road, so scheduling was restrictive and keeping install time to a minimum was a priority. There was also limited access for installation equipment and staging materials. In addition, the installation of piles was weather dependent, and therefore subject to change without notice. ![](https://www.idealfoundationsystems.com/hs-fs/hubfs/Imported_Blog_Media/DC-SEWER-768x1365-1-1.jpg?width=768&height=1365&name=DC-SEWER-768x1365-1-1.jpg "DC-SEWER-768x1365") **SOLUTION:** [Creative Concepts Group, Inc.](http://www.ccgicorp.com/) presented STELCOR Drilled-In Displacement Micropiles (DDM) to the D.C. Water & Sewer Department as an alternate. Engineers believed that a helical pulldown pile was substandard and would have failed in torsion at less than 20,000 ***ft⋅***lbf. A STELCOR pile was tested and exceeded the requirements. STELCOR had a resistance of 30,000 to 40,000*** ft⋅***lbf in the top 10 feet and had a torque capacity of over 50,000 ***ft⋅***lbf. With limited access and a tight schedule, a total of 46 STELCOR piles were installed for this thrust block reinforcement foundation. The STELCOR piles were able to bear higher loads at lesser depths, saving time and money. **INSTALLER:** Creative Concepts Group, Inc. **GEOTECHNICAL ENGINEER: **D.C. Clean Rivers Project **STRUCTURAL ENGINEER:** Bryant Blake P.E. **ARCHITECT:** Reitan Architects LLC **LOADS:** Anticipated – 200 kips factored (compression and tension) Actual – 102 Kips (Compression) 114 Kips Tension Piles met refusal at less than half of the anticipated depth **PILE DETAIL:** STELCOR 1200 18” tip or drive plate 16” corrugated grout column 13” solid grout column 8” reverse auger 5.5” O.D. X 0.361″ W.T. – 80 ksi central shaft **SOILS + EMBEDMENT DEPTH:** Soils consisted of clayey sands, silty sand, and silty gravel with sand. ([SEE SOILS REPORT](https://www.idealfoundationsystems.com/wp-content/uploads/2021/05/DC-WATER-SEWER-CLEAN-RIVERS-FULL-CASE-STUDY.pdf)) Piles were intended to go 62’ but all piles met refusal at approximately 30’. [DC WATER & SEWER – CLEAN RIVERS – FULL CASE STUDY](https://www.idealfoundationsystems.com/wp-content/uploads/2021/05/DC-WATER-SEWER-CLEAN-RIVERS-FULL-CASE-STUDY.pdf) Topics: [ Case Study ](https://www.idealfoundationsystems.com/blog/topic/case-study) [ Drilled-In Displacement Piles (DDM) ](https://www.idealfoundationsystems.com/blog/topic/drilled-in-displacement-piles-ddm) Don't forget to share this post: ## Related Articles [![](https://www.idealfoundationsystems.com/hs-fs/hubfs/Baltic%20St_.png?width=713&height=401&name=Baltic%20St_.png) ### STELCOR Supports a Complex Development Site in Brooklyn’s Gowanus Neighborhood May 18th, 2026|1 min read ](https://www.idealfoundationsystems.com/blog/stelcor-supports-a-complex-development-site-in-brooklyns-gowanus-neighborhood) [![](https://www.idealfoundationsystems.com/hs-fs/hubfs/16-777x246.jpg?width=777&height=246&name=16-777x246.jpg) ### STELCOR Piles Installed Adjacent to Elevated MTA for Lorimer House Project May 18th, 2026|1 min read 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With STELCOR February 2nd, 2018|1 min read ](https://www.idealfoundationsystems.com/blog/keeping-it-clean-washington-d-c-stelcor) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Bruce Stroyer", "url" : "https://www.idealfoundationsystems.com/blog/author/bruce-stroyer" }, "dateModified" : "2024-11-20T16:45:16.611Z", "datePublished" : "2021-02-11T06:37:00.000Z", "headline" : "Keeping it Clean in Washington D.C. With STELCOR - IDEAL Foundation Systems", "image" : [ "https://www.idealfoundationsystems.com/hubfs/Imported_Blog_Media/DC-SEWER-2-150x150-1-1.jpg" ], "mainEntityOfPage" : { "@id" : "https://www.idealfoundationsystems.com/blog/keeping-clean-washington-d-c-stelcor", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://www.idealfoundationsystems.com/hubfs/ASSETS/logos/Ideal-Logo.png" } } } ```