Rain for Rent provides creative and cost effective solutions to your liquid handling problems

City of Tucson, Arizona, Sewer Bypass

This is the Pima County, City of Tucson bypass project. Over 104,000 ft of HDPE pipe were fused and sewage will be pumped for 6 months as the city repairs its major sewer intercept line.

Overview:

On September 7, 2002 Pima County had sewer line failures resulting in spillage into the streets of Tucson. Rain for Rent was called to set up emergency bypass pumping systems to divert the flow. Once the emergency was under control, Pima decided to set up a bypass around the affected area.

The request for bid was received September 19th with a due date of the following Monday. Upon award, Rain for Rent began to mobilize people and equipment immediately. Project management arrived on site on the 26th and pipe started arriving on the 30th. One week from bid due date equipment was on site and pipeline construction began.

The system is designed to pump up to 38 million gallons per day over a five mile distance. With numerous environmental and safety concerns, Rain for Rent completed the construction with zero incidents.

Flow Management:

The project consists of four (4) separate pump groupings, each discharging into its own discharge line. Three (3) of these groups pull out of the Special Chamber between the I10 frontage road and the Santa Cruz River and one (1) pulls from the manhole just to the northeast of the chamber.

Two (2) of these groupings (type A) are identical and consist of three (3), DV300s (view pump curve). One (1) of the pumps from each type A group handles all primary flows up to approximately 4.9 MGD.

The other two (2) pump groupings (type B) are identical to each other and consist of one (1) DV350 (view pump curve) and two (2), DV300s. The two (2) DV300s from each of these groups may be used to handle very low, off peak flows but are intended as 100% backup to the DV350. The DV 350s each handle up to 7.4 MGD for typical peak daily flows.  

 

 

 

A Milwaukee-based environmental engineering and contracting firm contacted Rain for Rent Chicago for assistance with a field remediation project in southeastern Wisconsin. The site in questions was once home to a metals-treating and finishing business and was known to be significantly contaminated with the industrial solvent TCE.

The engineering form needed to build a large culvert and water-transport system to move contaminated groundwater from numerous points across the site to a central, permanent, water treatment facility that they were under contract to design and construct. A portion of the right-of-way within which the culvert was to be constructed was determined to be significantly contaminated. Field testing showed groundwater TCE levels of 2 to 3 parts-per-million. The existing treatment facility at the site could only process contaminated groundwater flows of 75 GPM. Rain for Rent Chicago designed a comprehensive temporary filtration system to address this problem.

The client supplied a wellpoint dewatering system which produced 250-350 GPM flows. Rain for Rent supplied a 18,100 gallon Worksafe steel double weir tank to assist in the settling of larger solids and sediments pumped from the wellpoint dewatering system. From the weir tank, TCE contaminated groundwater was pumped by a Power Prime HH80 high-head centrifugal pump to a Rain for Rent PF400 mobile particulate filter which utilized combined bag and cartridge filter media to remove additional solids and sediments, achieving a filtration efficiency of .5 microns.

The filtered groundwater was then pumped through two 4,000 lb granular activated carbon (GAC) pressure vessels, providing a polish treatment which allowed the client to meet his WPDES discharge permit limit of <50 parts-per-billion TCE. For added security, the client requested Rain for Rent Spillguard containment berms for the rental tank, pump and filtration units used in the process system.

Rain for Rent Chicago specializes in assisting its clients with the specification, design, delivery, and installation of comprehensive temporary solutions to their liquid storage, handling, processing, and filtration problems.

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