AGENDA CAPTION:
Title
Consider approval, by motion, of Change in Service No. 2 Lockwood, Andrews & Newnam, Inc. for Engineering Services for the Coers Drive Improvements Project in a not to exceed amount of $108,460.00.
Body
Meeting date: December 6, 2016
Department: Engineering and Capital Improvements
Funds Required: $108,460.00
Account Number: Project C597
Funds Available: $204,912.00
Account Name: Coers Drainage Improvements (C597)
CITY COUNCIL GOAL:
Goal #5 Maintain and improve City’s infrastructure
COMPREHENSIVE PLAN ELEMENT(s):
Environment & Resource Protection
- Goal 3 Pro‐active policies that encourage recycling and resource and energy efficiency
- ERPG306 Create a connected network for non‐automobile transportation
Land Use
- Goal 3 Set appropriate density and impervious cover limitations in the environmentally sensitive areas to avoid adverse impacts on the water supply
- LUG302 Implement rain water retention and storm water Best Management Practices
BACKGROUND:
The scope for this change in services with Lockwood, Andrews & Newnam, Inc. (LAN) was negotiated and is being submitted for Council approval for a not to exceed amount of $108,460.00. This Change In Service # 2 adds additional funds so the design engineer can finalize the design plans to accommodate the scope revisions.
In 2015, the City asked Halff Associates to investigate the drainage runoff associated with the Old Ranch Road 12 Bike/Pedestrian and Widening project. It was determined that there will be a negligible increase in runoff associated with the road widening. Since a portion of the project drains to Coers drive, Halff Associates investigated the current drainage on Coers. It was recommended that the two drainage crossings on Coers be replaced with larger pipes and the existing ditch gets widened to assist with current drainage problems in the area.
LAN completed the preliminary engineering report (PER) in the summer of 2016. Based off the PER, it was estimated that the existing channel would need to be widen to 14 feet - 20 feet. As LAN gathered more data and continued to finalize the profile of the channel design; it was determined that the channel would need to be even wider than anticipated; up to 33 feet in some locations. Staff has concerns about the additional width, ROW requirements, impacts it will have on the residents and the final appearance of the street. The decision has been made to convert the wide sections of the channel to underground box culverts and add a rain garden to the project scope to help with water quality. This will drastically reduce the amount of ROW required, save several trees from removal and help keep the street feeling like a neighborhood.
The cost estimate has increased from $1.0 M to $1.7M with this scope addition. In addition to the drainage improvements, the water and wastewater will be replaced and we will install a 5 foot wide sidewalk from Old Ranch Road 12 to Owens.
The construction anticipated to start in 2018. This project will be completed prior to the start of construction on the Old Ranch Road 12 Bike/Pedestrian and Widening project.