{"id":89329,"date":"2019-06-03T00:00:50","date_gmt":"2019-06-03T04:00:50","guid":{"rendered":"https:\/\/www.constructionspecifier.com\/?p=89329"},"modified":"2019-05-31T10:29:38","modified_gmt":"2019-05-31T14:29:38","slug":"complex-dewatering-underway-at-colorado-mixed-use-community","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/complex-dewatering-underway-at-colorado-mixed-use-community\/","title":{"rendered":"Complex dewatering underway at Colorado mixed-use community"},"content":{"rendered":"

by David Giles<\/strong><\/p>\n

\"Temporary<\/a>
Temporary dewatering and groundwater treatment systems are in operation at Reve, a mixed-used development in Boulder, Colorado.<\/span>
Photos \u00a9 Bairn Leonard, TerraFirma Earth Technologies<\/span><\/em><\/figcaption><\/figure>\n

Temporary dewatering and groundwater treatment systems have been installed for a highly anticipated mixed-use development in Reve, Boulder, Colorado. The Reve project is located at 30th<\/sup> and Pearl Street, across from the new Google complex. It has been four years in the making, and projected occupancy is January\/February, 2021. This is Southern Land Company\u2019s<\/a> first development in the Boulder market. The Reve community will offer multiple lifestyle choices including micro, studio, efficiency, one-, two-, and three-bedroom town homes, and live\/work residences. The plan contains 244 residences, 2276 m2<\/sup> (24,500 sf) of retail space, 10,099 m2<\/sup> (108,700 sf) of office space, and ample green space and bike paths.<\/p>\n

With the dewatering system up and running, the excavation of both the north and south parcels has reached its target subgrade of 8 m (26 ft) below ground surface, despite having to perform the work throughout Boulder\u2019s winter months. The estimated eight-month-long maintenance and operation phase of the dewatering continues and is expected to be complete by summer 2019.<\/p>\n

\"The<\/a>
The wells are closely spaced along the excavation perimeters of the two subterranean parking structures, depressing the groundwater nearly to bedrock. A total of 52 wells were installed producing flows up to 1893 L (500 gal) per minute.<\/span><\/figcaption><\/figure>\n

Winter temperatures required constant monitoring of the deepwells. According to Southern Land project manager Jonathan Harel, a technician monitored the wells 24\/7 either remotely with camera images every 15 minutes or onsite to be certain the low nighttime temperatures did not freeze the pipes and disable the pumps.<\/p>\n

\u201cCrews were very responsive to any situation that came up. Whenever a situation emerged, they were always willing to put in the time to resolve it, even late in the night,\u201d said Harel.<\/p>\n

Crews kept concrete blankets over the main that connected the wells and added heat trace to ensure nothing froze.<\/p>\n

Why so deep?<\/strong><\/p>\n

\"Perimeter<\/a>
Perimeter groundwater collection trench at bedrock-alluvium interface leading to filtered portable sump well.<\/span><\/figcaption><\/figure>\n

As available lands become scarce, underground parking has become more and more appealing, especially in growing urban areas like Boulder. Additionally, city planners\u2019 and developers\u2019 desires to maintain views and not block sunlight further the advantages of underground parking over above-ground. For these reasons, Southern Land Company chose to build two levels of subterranean parking beneath the entire development.<\/p>\n

Digging deeper, however, can be a difficult and costly task if improperly planned out. One of the most important considerations, especially for excavations extending below the groundwater table, is effective control and lowering of the groundwater prior to excavation. This process is known in the construction industry as dewatering.<\/p>\n

The high water table, located just 3 m (10 ft) below ground surface, along with complex geological conditions at the Reve site, created special challenges for the dewatering firm, with important cost considerations for the developer.<\/p>\n

\u201cThe site of Reve is situated over 1 to 3.3 m (2 to 11 ft) of man-placed fill, underlain by water-bearing, naturally occurring sand, gravel, cobbles, and even some boulders,\u201d explained Bairn Leonard, the dewatering firm\u2019s superintendent. \u201cMaking dewatering even more of a challenge, bedrock was encountered between 4 and 9 m (12 and 28 ft) below ground surface. With a planned excavation extending to approximately 8 m (26 ft) below ground surface, well below the top of bedrock, meant lowering the water table to the top of the confining layer. Committed to having two parking levels below ground, we proposed multiple possible dewatering methods for the developer to deliberate over. These were supported by the geotechnical engineering report conducted by Terracon<\/a>, and the Groundwater Characterization Study by Ayres Associates<\/a>.\u201d<\/p>\n

<\/p>\n

Deepwell dewatering wells chosen<\/strong><\/p>\n

\"\"<\/a> \"\"<\/a><\/p>\n

What a difference a day makes. Dewatering Reve\u2019s south excavation utilizing filtered portable sump well installation. Before and after shots are shown above.<\/span><\/p>\n

Photo \u00a9 David Giles, TerraFirma Earth Technologies<\/em>\u00a0<\/span><\/p>\n

With the excavation extending well beyond the limits of a traditional vacuum wellpoint dewatering system, and the anticipated flow rates exceeding that of an ejector-well dewatering system, the project team chose to rely on closely spaced, large diameter deepwell dewatering wells as the primary means of controlling the groundwater. The deepwell dewatering wells were installed from ground surface, just outside the excavation\u2019s h-pile and wood lagging support system. With the perimeter of both the south and north parcel excavations exceeding 2000 lineal feet, a total of 52 deepwell dewatering wells were installed.<\/p>\n

To install the wells, the dewatering firm utilized a hydraulic drilling rig to advance the 762-mm (30-in.) diameter borehole to the designed termination depth of 10 m (32 ft), excavating the extensive layer of sand, gravel, cobbles, and boulders. Additionally, by utilizing a powerful rig, the project team was able to penetrate nearly 3 m into the underlaying bedrock, creating a \u2018sump-effect\u2019 along the entire excavation footprint. This allowed the dewatering team to draw down the water further, closer to the bedrock\/alluvial interface.<\/p>\n

Portable sump wells supplement traditional deepwell dewatering wells<\/strong><\/p>\n

The dewatering plan also included the installation of strategically placed portable sump wells within the excavation to supplement the deepwell dewatering wells. These were necessary because of the excavation extending below the rock\/alluvium interface, according to Leonard. The portable sump wells were utilized to handle perched\/trapped groundwater within the excavation, as the excavation encroached on the bedrock\/alluvial interface. Each portable sump can consisted of a 305-mm (12-in.) diameter x 30-m long polyvinylchloride (PVC) factory-slotted well screen. Each sump can was fitted with an electrically driven submersible dewatering pump assembly. The sump wells were drilled in from the top of bedrock, extending approximately 3 m deep. The sump well was then surrounded with a select filter material.<\/p>\n

Leonard said, \u201cSelecting the proper filter material and placement method was very important. By pre-filtering the groundwater prior to collecting it in the common discharge manifold and ultimately through groundwater treatment-filtration equipment installed at ground surface, additional costly treatment measures were avoided by preventing premature clogging and fouling of the treatment equipment. Each sump pump was also fitted with a liquid level control device that turned the pump on and off, based on the water level within the sump, preventing the pumps from running dry and causing premature pump failure.\u201d<\/p>\n

Cleaning of water prior to discharge<\/strong><\/p>\n

\"Following<\/a>
Following the initial drawdown, the treatment system capacity was reduced from flows of 1893 L per minute to less than 568 L (150 gal) per minute. The contractor was then able to reduce the treatment system footprint to half its original size, freeing up precious space on an already congested site.<\/span>
Photo \u00a9 Bairn Leonard, TerraFirma Earth Technologies<\/span><\/em><\/figcaption><\/figure>\n

From the deepwells, the groundwater was directed to Boulder\u2019s Left Hand Ditch, directly adjacent to the site. However, as is true of many construction sites along Denver\u2019s front range, the preliminary geotechnical and environmental sampling reports revealed contaminated groundwater.<\/p>\n

Following the approval of the remedial discharging of the surface water permit from the Colorado Department of Public Health and Environment (CDPHE), the project team developed a remedial activities management plan to reduce the pollutants of concern to below the limits set forth in the permit.<\/p>\n

The groundwater treatment plan included the introduction of sodium hypochlorite (NaClO) into the dewatering influent water to oxidize iron (Fe), and manganese (Mn). Caustic acid was also dripped into the tanks as a means of controlling pH, further promoting the oxidation of the metals. These reactions took place in two, 79,494-L (21,000-gal) flocculation tanks. From the flocculation tank, the water was pumped through two, 12-unit bag filtration pods to capture the flocculated metals. Granular activated carbon was added to the treatment train to remove volatile organic compounds (VOCs) and residual chlorine in the treated water.<\/p>\n

\u201cThis process has proven effective and cost efficient in achieving the desired results. The system was designed for flows up to 1893 L (500 gal) per minute,\u201d added Leonard added. \u201cOnce the site was dewatered, the system was resized for lower flow rates, significantly reducing the area required to accommodate the equipment on an already congested site\u2014a benefit to this near-zero lot line project\u2014returning pure, drinkable water to the Left Hand Ditch.\u201d<\/p>\n

Tony Brace, general superintendent of Colorado, Southern Land, said, \u201cThis project, like many others, was different in the field than it was on paper. For example, the discharge manifold was modified in the field as it was being laid. The dewatering team had the flexibility to work with the other trades, giving access to the people that needed it, which kept the project on time.\u201d<\/p>\n

\"\"<\/a>David Giles is president of TerraFirma Earth Technologies. Giles has a BS in geology from Iowa State University and 33 years of experience in developing and implementing design-build solutions for construction dewatering and groundwater control using deep wells, wellpoints, and ejector systems. He enjoys collaborating with project teams to find the approach that will yield the highest value. Giles can be reached at dgiles@tfearth.com<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Temporary dewatering and groundwater treatment systems have been installed for a highly anticipated mixed-use development in Reve, Boulder, Colorado. With the dewatering system up and running, the excavation of both the north and south parcels has reached its target subgrade of 8 m (26 ft) below ground surface, despite having to perform the work throughout Boulder\u2019s winter months.<\/p>\n","protected":false},"author":4183,"featured_media":89338,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[520,12,179,449,201,477],"tags":[3403,5364,2870,5365,5366],"class_list":["post-89329","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-features","category-web-exclusive","category-masterformat","category-uniformat","category-31-00-00-earthwork","category-g10site-preparation","tag-colorado","tag-deepwells","tag-dewatering","tag-groundwater-treatment-systems","tag-site-excavation","entry"],"acf":[],"yoast_head":"\nComplex dewatering underway at Colorado mixed-use community - The Construction Specifier<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.constructionspecifier.com\/complex-dewatering-underway-at-colorado-mixed-use-community\/\" \/>\n<link rel=\"next\" href=\"https:\/\/www.constructionspecifier.com\/complex-dewatering-underway-at-colorado-mixed-use-community\/2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Complex dewatering underway at Colorado mixed-use community - The Construction Specifier\" \/>\n<meta property=\"og:description\" content=\"Temporary dewatering and groundwater treatment systems have been installed for a highly anticipated mixed-use development in Reve, Boulder, Colorado. 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