This project includes the design of a 1,890 GPM Lift Station, approx. 1 mile of gravity sewer line, and a mile of 8" and 12" sewer force mains. Crafton Tull will manage permitting. Crafton Tull is coordinating with subconsultants, providing right-of-way and easement documents, bid coordination, and construction administration for this project that is still in the design stage.&nbsp;
As part of this project, three existing STEP systems will be decommissioned, and Crafton Tull will design gravity conversions to the public sewer system. We will provide for future expansion for the City of Lowell with a cost-effective plan to extend sewer service to previously undeveloped areas. We will provide analysis and current capacity of the force main outfall at the Puppy Creek Interceptor.
Crafton Tull provided a topographic design survey for these sewer improvements along Highway 264, east of Spring Creek Road.

Learn about Crafton Tull's work on Western Lowell Sewer Improvements.

Crafton Tull | Western Lowell Sewer Improvements

[X] Western Lowell Sewer Improvements

Education

Awards

P.E., LEED AP

Learn more about Daniel Ellis and his role and experience at Crafton Tull.

Crafton Tull | Daniel Ellis

Daniel is Senior Vice President of the&nbsp;Civil Division&nbsp;and manages the Rogers office of Crafton Tull. He is a member of the American Society of Civil Engineers, American Society of Professional Engineers, the International Erosion Control Association, and he holds professional engineering licenses in two states and carries a LEED AP&reg; certification.
Daniel has managed civil engineering projects from retail developments to apartments to schools, roads, a football stadium, and a major hospital addition. His broad scope of knowledge in drainage projects gives clients confidence that the job will be done right. He works as quality control over Northwest Arkansas civil engineering and surveying projects.

Daniel's Work

Learn about Crafton Tull's work on Shadow Valley Phase 10 + 11.

Crafton Tull | Shadow Valley Phase 10 + 11

Learn about Crafton Tull's work on NWACC Center for Health Professions.

Crafton Tull | NWACC Center for Health Professions

P.E., MBA

Learn more about Michelle Dodroe and her role and experience at Crafton Tull.

Crafton Tull | Michelle Dodroe

Michelle is an experienced civil engineer and leads Crafton Tull's office in Fort Smith, where she lives with her husband and son. Her expertise includes sanitary sewer assessment and remediation, mainline water extensions, water and wastewater asset mapping and modeling, and roadway and drainage design. She is a member of Leadership Arkansas Class XVI and graduated from Leadership Fort Smith in 2019. Michelle is a licensed Professional Engineer in Arizona, Arkansas, Oklahoma, and Louisiana.

There exists an increasing need for infrastructure rehabilitation. Factors in this struggle include rising community expectations, increasing environmental awareness, diminishing financial resources, aging infrastructure, growing risk management, and regulator expectations. To mitigate these issues, several trenchless rehabilitation methods have emerged from this growing need, including CIPP, Slip Lining, and Pipe Bursting. Design factors such as hydraulic capacity, line location, and other existing utilities determine which techniques are appropriate. CIPP can provide one of the most effective, comprehensive solutions to the rehabilitation of pipes with existing limitations.
Cured-In-Place Pipe, or CIPP, was introduced by Eric Wood and first used in London, England, in 1971. It is a full-segment rehabilitation of pipe and takes on the shape of the host pipe, essentially becoming a pipe within a pipe. This trenchless technology is used to remediate or repair subsurface utility pipes, most often sanitary sewer. In many cases, a community&rsquo;s aging sewer infrastructure is leaking, collapsing, or has been compromised and is subject to exfiltration and/or infiltration.
Exfiltration happens when sewage in a pipe is allowed to improperly exit the system and enter the surrounding environment, which is prohibited by the Environmental Protection Agency (EPA). Infiltration happens when ground water is allowed to enter the system. This impacts the system&rsquo;s design capacity and can lead to overflows and increased treatment expenses.
IPP consists of a non-woven fabric impregnated with resin, either pulled into place or inverted, inflated, and cured by heat (steam or heated water) or UV-light. There are typically two types of fabric used in CIPP, felt and fiberglass. Resins include polyester, vinyl ester, or epoxy and can be either factory applied and transported to the site in a lightless temperature-controlled manner, or wetted on site. Typically, resin is applied to the liner in the climate controlled factory, however, some circumstances, such as large pipe sizes, require an on-site or over-the-hole wet-out process due to transportation limitations.
Most resins used with CIPP are styrene-based. While curing CIPP, a noticeable styrene odor is present; however, levels released are not dangerous and are well within the National Institute of Occupational Safety and Health (NIOSH) recommendations. Keeping the local public appraised of this information is key to reducing public health concerns during CIPP projects. Additionally, UV-cured liners release less styrene odor and can be beneficial for this reason in areas of high sensitivity.
CIPP can be installed to restore the structural integrity of an entire pipe or as a spot repair to mitigate a localized point in need of repair.
<img src="https://api.crafton-tull.doc4.pro/media/uploads/insights/cipp_lining/cipp-pwtrenchless-1617028082.jpg" alt="CIPP lining install" width="800" height="534" />
<h6>&copy; PW Trenchless - Image Source:&nbsp;<a href="https://www.pwtrenchless.com/">pwtrenchless.com</a></h6>
CIPP is secured in place using a mechanical lock on the current host pipe at the manholes and pipe joints. The interface between the liner and the host pipe is sealed at the manholes to eliminate infiltration and exfiltration of the system. CIPP is best used in host pipe materials other than plastic, and can accommodate uncommon pipe shapes, such as egg shaped, and materials, including brick.
Because sewer by-pass of the system is necessary during installation, it is recommended to notify affected property owners of the planned temporary interruption of service. Typically, the contractor will leave door hangers in the project area to prepare residents and businesses, giving them a point of contact for questions.
The CIPP process begins with pre-cleaning to remove roots and debris from inside the pipe. Then the pipe is inspected using closed-circuit television (CCTV). This is called &ldquo;Pre-CCTV&rdquo; in the work contract. If the pipe is a good candidate for CIPP installation, the method, material, thickness, and tolerances are established.
Once installed, the resin must cool completely at a controlled rate to prevent snapping or delamination issues. Samples are collected and sent to a certified laboratory for flexural modulus and modulus of elasticity testing of the cured material. Typically, one (1) sample is sent for every 1,000 LF of CIPP installed on a job. Meanwhile, the service connections are reestablished.
<img src="https://api.crafton-tull.doc4.pro/media/uploads/insights/cipp_lining/cipp_lining.jpg" alt="CIPP before after" width="800" height="440" />
Finally, &ldquo;Post-CCTV&rsquo; data is collected and inspected for defects. The final acceptance of the line is based on materials testing results and post-CCTV documentation. Usually, the material supplier and the installation contractor will provide separate warranties for a standard period of time.
Pricing per linear foot naturally improves with higher quantities of installation.
Pros:
<ul>
<li>Cost effective compared to trenching and site restoration.</li>
<li>Minimally invasive. Can be accomplished with less service interruption, traffic disruption, and public inconvenience.</li>
<li>Work is completed in much shorter time frames, usually within hours instead of weeks.</li>
<li>CIPP is a structural reformation and extends the lifecycle of the pipe. Not merely patching but fully restoring pipe integrity.</li>
<li>CIPP can reestablish a smoother interior surface for partially or fully degraded pipes to increase flow capacity. Additionally, this method of remediation minimally reduces the interior diameter of the host pipe.</li>
</ul>
Cons:
<ul>
<li>CIPP does have limitations to the pipe failures it is applicable to. It cannot correct a sag in the pipe, pipe intrusions, severely offset joints, or larger holes that can allow the CIPP to balloon into a vacant space.</li>
<li>Installation usually requires certified specialists.</li>
<li>CIPP can be improperly installed. The lining can snap, delaminate, wrinkle, have dry spots, curing irregularities, or foreign inclusions.</li>
</ul>
<hr />
CIPP installation specifications come from ASTM F1216-12 and F1743-13. Tube and resin material specifications are found in ASTM D5813-14. The National Association of Sewer Service Companies (NASSCO) has been proactively developing CIPP health and safety requirements for over 35 years, including an inspector training and certification program.

CIPP Lining is cost effective, minimally invasive, and work is usually completed within hours.

PROJECTS

Western Lowell Sewer Improvements