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frankmwilliams25 · 4 years

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Denver Water News – Summer Watering & Water Pitchers

In March, Denver Water began its Lead Reduction Program, which was approved by the Environmental Protection Agency and the Colorado Department of Public Health and Environment in December 2019.

The water Denver Water delivers to customers is lead-free. But lead can get into drinking water as it passes through customer-owned water service lines and indoor plumbing that contain lead. Water service lines are the smaller pipes that bring water from Denver Water’s main delivery pipes in the street into homes and buildings.

Denver is replacing the estimated 64,000 to 84,000 customer-owned lead service lines in Denver Water’s service area with copper lines. This work, done at no direct charge to the customer, will take 15 years to complete. In Denver Water’s experience, homes built before 1951 are most likely to have lead service lines. You can read more about this in a post from March 2.

Denver Water’s Lead Reduction Program is providing pitchers and water filters to customers who have or may have a lead service line. You may have recently received this free water pitcher – many neighbors have reported receiving theirs and were not familiar with the program. Replacement filters will be sent regularly and filtered water should be used for drinking, cooking and preparing beverages such as infant formula until six months after the lead service line is replaced. Contact Denver Water if you have questions about the Lead Reduction Program or the water pitchers.

Denver Water just released its summer watering rules.

For nearly a century, Denver Water has provided guidelines to help you conquer watering season as efficiently as possible.

“Whether it’s a wet year or a dry year, the rules are there to make sure folks stay mindful of their water use in the summer,” said Jeff Tejral, a Denver Water water efficiency manager. “We always want people to use water as efficiently as possible, especially during watering season.”

The summer watering rules, which begin May 1 of every year and last until Oct. 1, encourage people to:

Water during cooler times of the day — lawn watering is not allowed between 10 a.m. and 6 p.m.

Limit watering to no more than three days per week.

Avoid watering while it is raining or during high winds.

Direct sprinkler heads away from concrete and asphalt.

Prevent water from pooling in gutters, streets and alleys.

Repair leaking sprinkler systems within 10 days.

Use a hose nozzle with a shut-off valve when washing your car.

If you live in the Denver metro area, it’s important to know your landscape and water only when necessary. Your lawn (and Denver’s water supply) will thank you.

By Denver Water’s Jimmy Luthye and Steve Snyder

The post Denver Water News – Summer Watering & Water Pitchers appeared first on Cranmer Park/Hilltop Civic Association.

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janicecpitts · 6 years

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jasonheart1 · 6 years

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Why are parts of I-25 concrete and asphalt?

Mike from southeast Aurora writes, “What is driving you crazy? Hey Jayson, why do they pave parts of I 25 with asphalt and other areas with concrete?”

Oh, the debate between asphalt and concrete is almost as old as the Ford Model T. There are benefits and problems with both surfaces. We will go over that in a bit. I can see from the picture you sent, you were driving on northbound I-25 at Belleview. That is part of the section of I-25 that is going through an $11 million repaving project this summer. The concrete that you transitioned to doesn’t need to be repaved. That is one of the benefits of concrete you hear from proponents.

The reason you transition between asphalt and concrete on I-25 between C-470 and Alameda is thanks to the 2001 T-REX project. T-REX stands for the Transportation Expansion Project, a $1.67 billion combined freeway reconstruction and light-rail extension in southeast Denver.

I recall during the initial design phase of the project that some engineers made the recommendation to create the entire road surface in concrete. Others suggested that using all concrete would raise the cost of the project much higher while others said concrete would cost more initially but would last much longer. At the time, planners were trying to keep the overall road portion of the project under $800 million. The discussions continued during the project since it was constructed using the “Design Build” method. That is where the contractor, in this case Kewit Construction, created a general layout and conceptual plan before starting work and continued working on and changing that plan during construction. Many of the final details, even some of the larger issues, were decided well after construction started.

MORE: Read more traffic issues driving people crazy

The debate between concrete and asphalt is a contentious one between companies that make it. Concrete is generally more durable than asphalt and is usually preferred on roads with higher traffic volume. Mark Wachal, president of Recycled Materials Co. in Arvada told the Denver Business Journal before the T-REX project started, "Asphalt is a flexible pavement and has the capability of moving slightly. In case of our weather changes and temperature changes, asphalt has the ability to be a little more flexible and not crack. It also has the downside at times of rutting with heavy traffic in a given path.” The "rutting" has turned out to be a major problem on I-25 in the Denver Tech Center, especially during heavy rains.

The journal also pointed out that in the Colorado/Wyoming Chapter of the American Concrete Pavement Association proposal to the Department of Transportation, that concrete pavement costs less, lasts longer and is safer than asphalt. The group added that, "Concrete pavement requires little or no maintenance. CDOT estimates that 22 years will pass before a major rehabilitation is required on concrete, while major asphalt overlays are required every 8 years on asphalt pavement. Annual maintenance costs per lane mile for concrete are one-twelfth those of asphalt."

The case for concrete by the pavement association in the journal article continued saying, "textured concrete pavement has better skid resistance than asphalt, is brighter at night and does not have black ice". The Federal Highway Administration states that concrete increases fuel efficiency for trucks by up to 20 percent.

According to Ayres Associates, a nationwide engineering, mapping, environmental, architectural, and survey firm, there are some key differences between asphalt and concrete.

High traffic counts – particularly heavy truck volumes – make concrete a desirable choice because it simply holds up better under heavy loads. Hence the tendency for state departments of transportation to go with concrete on interstates.

Roadway segments with high turning movements and stopping points also present some disadvantages for asphalt since it is prone to tearing under these stresses. But even this is not a black-and-white matter. Harder oils can be used in asphalt mixes to reduce rutting, but this can also make the asphalt more brittle. Likewise, the wrong oil in an asphalt mixture can lead to cracking in extreme cold and rutting in extreme heat.

Asphalt provides a nicer, smoother, often quieter ride when relatively new. Concrete can be noisier because it is tined or broomed during construction to make it rough enough to provide good tire grip. And slight shifting and settling of the many slabs of concrete over time can produce that rhythmic ka-tunk, ka-tunk, ka-tunk sound motorists know well.

Harsh winter conditions present some disadvantages for concrete. The darker asphalt pavement warms up as sunlight hits a plowed roadway, and Mother Nature helps melt away any snow left behind by plows. Salt used for snow removal also can eat away at concrete, so some municipalities opt for a no-salt policy for the first winter or two after a concrete road is built.

Another geographic factor comes into play when the locally available aggregate that goes into a concrete mix has a high chert content. These chert pieces in the finished concrete collect moisture, and then during freeze-thaw cycles in the spring and fall the chert expands and pops out of the pavement, causing pock-marking.

For counties and small towns, asphalt is attractive because these agencies have the relatively simple equipment that can accomplish patching when maintenance is necessary. Cities may opt for concrete because it provides for less frequent repairs and better strength under the crush of heavier traffic volumes.

In urban settings, concrete also offers clear advantages if stamping and coloring is desired as a way to increase safety at crosswalks or to generally enhance aesthetics.

Asphalt is ready to drive on as soon as it is compacted by a roller. Concrete typically must cure for seven days after pouring. High-early-strength concrete varieties offer a one- to three-day curing period where shortening construction inconveniences is critical.

Ultimately cost is a primary consideration, and DOTs look at the life cycle cost over 50 years when comparing the two pavement types and their relative costs initially and in terms of maintenance.

In 2002 the Colorado DOT placed both concrete and asphalt on Powers Boulevard in Colorado Springs to determine the pros and cons of each pavement while each is exposed to the same weather, soil, and traffic conditions. The northbound lanes were paved with concrete and the southbound with asphalt. The 15-year study should produce some conclusions next year.

Denver7 traffic anchor Jayson Luber says he has been covering Denver-metro traffic since Ben-Hur was driving a chariot. (We believe the actual number is over 20 years.) He's obsessed with letting viewers know what's happening on their drive and the best way to avoid the problems that spring up. Follow him on Facebook, Twitter or Instagram or listen to his Driving You Crazy podcast on iTunes, Stitcher, Google Play, Podbean or YouTube.

from Local News https://www.thedenverchannel.com/traffic/driving-you-crazy/driving-you-crazy-why-do-they-pave-parts-of-i-25-with-asphalt-and-other-areas-with-concrete-

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