SANITARY SEWERAGE DESIGN

SANITATION DISTRICT NO. 1 - WILDER 20-INCH COLLECTOR SEWER RELOCATION

In the fall of 2001, Thelen Associates, Inc. documented a large landslide between a building located at the end Beacon Drive and the Licking River in Wilder, Kentucky.  In the spring of 2002, the Sanitation District No. 1 began experiencing damage to a portion of their 20-inch trunk sewer that extends from the north of University Boulevard northwardly to just west of Banklick Road approximately parallel to the Licking River.  The District then commissioned Cardinal to perform an as-built survey of the 20-inch sewer along the riverbank so that the extent of the damage could be determined.  The field survey determined that the landslide had damaged the sewer main between manholes 25 and 29.  Specifically, the main between these two manholes had reverse flow or negative gradients.  The District then commissioned Thelen to prepare a subsurface report of the landslide area with remediation recommendations.  After considering a few alternatives, Thelen ultimately recommended an aerial truck sewer to replace the damaged in-ground sewer.  Their opinion was that with an aerial pipe, the ground movement would not affect would not put direct stress on the pipeline, thereby minimizing damage.  Thelen mentioned that the movement of the landslide would tend to alter the horizontal and vertical alignment.  Typically small adjustments can be absorbed through rotation at the pipe joint.  However, in this case, Thelen recommended that we develop an apparatus to support the pipe that was vertically adjustable (approximately 3 inches) throughout and horizontally adjustable at the approximate ends of the landslide.

Based upon Thelen's Geotechnical report and recommendations for the project, Cardinal with the assistance of a Structural Engineer developed a unique vertically and horizontally adjustable pipe support for installation on top of concrete aerial piers.  The support was designed to be able to withstand the vertical and horizontal loads that could impact the pipeline.  The project was successfully completed in August 2003.

WALTON 201 STUDY/WASTEWATER FACILITIES PLAN UPDATE

For the past 18 years, Cardinal Engineering Corporation has been the City Engineer for Walton and has worked on countless wastewater, storm drainage, water distribution, and roadway projects.  One of the most significant City concerns has been the wastewater system.  In accordance with Kentucky Division of Water directives in 1993, the City had Cardinal perform an evaluation of the existing sewer system by visually inspecting each manhole and smoke testing the lines to see if there were infiltration (I/I) problems.  Several areas of concern were noted and repaired by the City.  Later that same year and as a follow-up to the aforementioned sewer system inspection, Cardinal prepared a 20-year comprehensive sanitary sewer analysis plan.  The report contained recommendations for the existing 225,000 gallon per day (GPD) treatment plant including effectiveness, size, operation, and the ability to meet future needs.

In 1995, Cardinal prepared a wastewater facilities plan that was submitted to the Kentucky Division of Water to satisfy a twofold need of the City.  At that time, the City needed a plan that described the current and future sanitary sewer system conditions and needs in the City.  Also, the City had entered into an Agreed Order with the State regarding the condition of the City’s sanitary sewer system.  In 1996 a second treatment tank and a new sludge holding tank was added. The existing tank was taken off line, refurbished to what the Sanitation District No. 1 termed a “20-Year Useful Life”, and then returned to service.  The approved second tank expansion increased capacity from 225,000 GPD to a capacity of 450,000 GPD.

Currently, Cardinal is preparing an update to the 1995 wastewater facilities plan.  The updated report will be used by the City of Walton as a planning tool for the future.  In the report, Cardinal will investigate the growth projected for Walton until the year 2020 and also the current condition and capacities of the sanitary sewer system within the City.  The information for this study will be obtained from discussions, meetings, and reviews of the area with developers, public and private sanitation owners, public officials, residents and land owners, the Kentucky State Highway Department, contractors, planning organizations, investigation of the existing facilities, previous sewer investigations, road systems, land topography, the 2000 US Census, and the Draft January 2001 printing of the 2000 Boone County Comprehensive plan.