​Lilly ​Mill Storm Drainage Improvement Project

​Latest ​News


​Blythe Development will begin staging structure and concrete pipe in the right of​ way, at the intersection of Lilly Mill Road and Tattersall Drive, starting as soon as Monday March, 11,2019. ​


Edrina Mabens-Collins will be on vacation Wednesday 2/20/2019 returning Monday 2/25/2019. During that time, Baris Bingol will be the Storm Water representative. Baris can be reached at (704) 589-9309 or  

The project team is anticipating that a PNG subcontractor will be performing a bore on Lilly Mill Road towards the end of this week or next week.  Weather continues to impact the construction schedule.​

​The contractor is required to place detour signs up in advance of road closures in order to give motorists advanced notice.  The rain has impacted the contractor’s schedule, so currently the closure of Lilly Mill Road is not anticipated until mid to late February.  To stay up to date on road closures, please visit . ​


Equipment and materials are expected to arrive at the jobsite the first week of January.  Materials such as pipe, backfill material, and box culvert sections will be stored in the right of way and in easements.  During unloading, delivery trucks may partially block streets so please use caution and patience while driving nearby.


​View the latest mailer with construction updates.


​The tree removal sub-contractor is anticipated to mobilize to the jobsite Wednesday, September 26th, and tree removal should start Thursday, September 27th.​​​​


Construction is ready to begin August 22. Work is expected to start at the intersection of Lilly Mill Road and Tattersall Drive.  In this intersection, work includes:

  • ​​​​​moving a utility pole by Duke Energy subcontractors and
  • installing a construction entranc​e and replacing a storm drainage pipe from Lilly Mill Road down to the stream.

​Tree removal will also begin on the stream section from the north side of Lilly Mill Road (where the culvert is) to near the intersection of Lilly Mill Road and Tattersall Drive. The trees are being removed to allow for stream bank stabilization and utility relocation work. After the construction work near the stream is complete, the City will plant new shrubs and trees.


The Sunnyvale/Chandworth Storm Drainage Improvement Project, with a drainage area of 640 acres, was broken down into three smaller projects: Lilly Mill, Chandworth and Tattersall.

The Lilly Mill Storm Drainage Improvement Project will reduce street and structure flooding throughout the neighborhood and address stream erosion to provide a more natural, stable stream system. The project is located within a drainage area of approximately 100 acres.

Estimated Cost: $9,200,000*

*includes all costs associated with this project such as planning and design, utility relocation, consultant fees, permits, construction, and landscaping.

The project team will manage the project through several phases. Specific work is conducted during each phase and general descriptions with timeframes are below. Public involvement is emphasized throughout the process.



PlanningCOMPLETEDJanuary 2013
DesignCOMPLETEDJuly 2018
PermittingCOMPLETEDJuly 2018
Property Easement/AcquisitionCOMPLETEDDecember 2016
ConstructionIN PROGRESSAnticipated March 2021

​Proje​ct Team

Adam Clapp
Construction Supervisor

Edrina​ Maben-Collins
Senior Construction Inspector

Jackie Bray, PE
Senior ​Project Manager



Lilly Mill November 2018 Mailer.pdfLilly Mill November 2018 Mailer
Lilly Mill May 2018 Mailer.pdfLilly Mill May 2018 Mailer
Lilly Mill March 2018 Mailer.pdfLilly Mill March 2018 Mailer
Lilly Mill January 2017 Mailer.pdfLilly Mill January 2017 Mailer
Lilly Mill June 2016 Mailer.pdfLilly Mill June 2016 Mailer
Lilly Mill November 2015 Mailer.pdfLilly Mill November 2015 Mailer
Lilly Mill July 2015 Mailer.pdfLilly Mill July 2015 Mailer
Lilly Mill March 2015 Mailer.pdfLilly Mill March 2015 Mailer
Lilly Mill November 2014 Mailer.pdfLilly Mill November 2014 Mailer
Lilly Mill July 2014 Mailer.pdfLilly Mill July 2014 Mailer
Lilly Mill June 12 2014 Public Meeting Presentation.pdfLilly Mill June 12 2014 Public Meeting Presentation
Lilly Mill June 12 2014 Public Meeting Minutes.pdfLilly Mill June 12 2014 Public Meeting Minutes
Lilly Mill May 2014 Mailer.pdfLilly Mill May 2014 Mailer
Lilly Mill March 2014 Mailer.pdfLilly Mill March 2014 Mailer
Lilly Mill November 2013 Mailer.pdfLilly Mill November 2013 Mailer

​​​​​​​​​​​​​​​​​​​​​Project Phases  ​

Survey crews document the existing drainage system and surrounding areas. The project team uses this information, along with property owner input and requests for service, to analyze existing drainage system conditions. Staff hosts a public meeting to present the existing conditions analysis and obtain additional input from property owners. Several improvement alternatives are then developed and evaluated to determine the most economical and least impactful solution. The project team presents the recommended alternative to property owners for input at a public meeting at the end of this phase. This phase typically lasts 12 to 27 months.

The project team develops detailed construction drawings for the selected alternative, addressing pipe sizes and alignments, drainage channel widths, utility relocations and easement locations. A project team member may meet with individual property owners to discuss the drainage system improvements and how construction will impact specific properties. The project team hosts a public meeting to present the preliminary design plan, which illustrates specific improvements to properties, and begin the easement acquisition process. This phase typically lasts 21 to 34 months.

The project team obtains required Federal and State water quality permits and other necessary permits, such as permission to work within railroad and NCDOT rights-of-way, as necessary. This phase typically lasts 3 to 9 months and will overlap with the Design Phase.

Property Easement/Acquisition
Staff works with property owners to acquire ​​temporary or permanent easements. Easements provide permission for Storm Water Services to access the property, construct the recommended improvement and provide future maintenance. This phase typically lasts 9 to 12 months and will overlap with the Design Phase.

A competitive bidding process is held to select a qualified contractor to construct the project. By state law, the lowest responsible bidder is awarded the construction contract. This phase typically lasts 7 to 8 months.

Throughout construction, the project team works to minimize disruption to property owners. The Storm Water Services construction inspector serves as the main point of contact for residents. Notifications of key construction dates will be communicated to residents prior to construction.  This phase varies, depending on the specific project, but typically lasts up to two years.

The construction contract includes a warranty guaranteeing materials and workmanship for one year from the date of completion. The construction inspector conducts 6- and 11-month inspections during the warranty period. Upon notification, the contractor must repair defective items at no additional cost.