Stormwater June 2012 : Page 45
HDPE pipe requires under-pressure grout, and cement in a few small segments of 12-inch perforated pipe. In total, salt water don’t work!” Downstream Services relined about 3,000 feet of pipe in 12 Surgery was needed. “Our liners are inserted, then infl at-segments. ed in the pipes—almost like angioplasty,” says Roberts. Re-To facilitate the liners’ installation, Coronado applied for, line America’s liners are fabricated from fi berglass and resin. and received, a temporary discharge permit to allow ground-Somewhat soft when inserted, the liners are cured with UV water discharges to the ocean during construction opera-light, which makes them rigid. “This is fairly new tech for the tions. Obtaining the permit required that the groundwater US, although it’s been used for 15 or 20 years in Europe,” to be routinely tested and to pass stringent biological and says Roberts. “One of its advantages is that when cured, it’s chemical tests, including several tests for toxicity, bacteria, extremely strong. Other relining technologies are thermal-and heavy metals. In theory, with the pipe now lined, the cured. Unfortunately, when temperatures reach 80 degrees, only water that enters the storm drain system would be from the products can begin curing—giving those products a storm drain inlets during a rain event and this water, in ac-two-week shelf life. Our liners have a shelf life of about six cordance with city permits, can be pumped to North Beach months, sometimes longer. However, we test anything older, and out to the ocean. to ensure the product will perform as promised.” “Unfortunately, groundwater infi ltration into upstream Isn’t working in the dark impossible? “We can see inside pipes still collects within the storm drain system and slowly the pipe because of the camera on the UV light train,” ex-fi lls the newly lined perforated pipe,” reports Jovanovic. “As plains Roberts. “As it’s sent through, you can see the liner the city plans for additional improvements to reduce infi l-isn’t twisted; if it is, you can fi x it by pulling out the liner tration, the storm drain system will be drained into the sew-and inserting it again. If the light train doesn’t see any prob-er system or be allowed to fi ll with water and reach equilib-lems, operators fl ip the switch to turn on the UV light, and rium with the surrounding groundwater table. Sliplining is pull back the light train to cure the pipe.” Reline America’s a technology the city will consider for future pipe rehabili-liners fi t pipes from 5 to 51 inches in tation projects on both sewer and storm diameter, so applications abound—from drain pipes.” Scan here to share this article or read residential piping to huge water mains. later. Get the app at The majority of Coronado’s pipes were Janis Keating is a frequent contributor to http://gettag.mobi 30 and 36 inches in diameter, with Forester Media publications. Water for a sustainable future { Environmental Passive Integrated Chamber } RESPONSIBLE WATER MANAGEMENT Our total system approach expands beyond traditional stormwater systems, which historically only store and/or treat stormwater pollutants. The Firestone Environmental Passive Integrated Chamber (EPIC Chamber ™ ) is an onsite water management and reuse system designed to collect, filter, retain and distribute water below ground at its source. UÊ,�d;�d; Ê-*�a;�d; UÊ/d;�d;/�a;Ê �d;d;�c;-UÊ,,/" UÊ*,c; Êd;"/-UÊ-/",f;7/�d;,Ê,1 " nnn®ÊÓÈ{£ÇÎxÊÊÊ | www.firestonesp.com June 2012 www.stormh2o.com 45