Surface Water Pipe Repair 2020

Summary of Project:
The City’s Surface Water Capital Program currently focuses on pipes with a minimum diameter of 18 inches since their potential failure could have a negative effect on life, property or a combination of both.  This larger infrastructure represents a total of 35,800 LF (approximately fourteen percent of the City’s total surface water pipe infrastructure).  Under their Contract 20181417, Mill Creek Storm Pipe Assessment, Perteet identified pipe faults and graded their severity on a 3-tiered level of granularity: A, C and F.  A graded faults were not expected to impact the longevity of the pipe.  C graded faults were recommended for repair within ten years.  
 
The Surface Water Aging Infrastructure (2020 Grade C Pipe Repairs) Project was advertised for construction bid on January 29th, 2020 and the repairs will consist of two trenchless methods that include: sectional cured in place lining (SCIPL) at 36 locations and 2,445 feet of cured in place pipe (CIPP).  The pipe repair work will take place in the following neighborhoods: Douglas Fir, Vine Maple, and Evergreen. Bids were opened on February 20th, 2020 and the City received three bids as shown in Attachment A. Staff has checked references and information included in the supplemental bidder responsibility forms and has confirmed that Allied Trenchless is the lowest responsible bidder.
 
The total construction phase is estimated at $741,190 as shown in Table 1 below.  These expenditures will be funded by the City’s surface water management fund.   As shown on the 2019-2024 Capital Improvement Plan (Attachment B), an amount of $1,050,000 was programmed for 2020.  This amount includes $300,000 from a Limited Tax General Obligation (LTGO) bond for purposes of assessing the City’s small pipes and $750,000 for capital project delivery.

Current Updates:                                                                            Vacuum truck
The City of Mill Creek will begin repairing the City’s surface water pipes in the Douglas Fir, Vine Maple and Evergreen neighborhoods beginning on Monday, July 20. Work on these repairs will take place over the next two months.

The City’s contractor, Allied Trenchless, will be utilizing trenchless technology that will allow the pipes to be repaired without having to excavate around the pipe. The contractor will open manholes and catch basin grates to gain access to the pipes to complete the repair work.

Citizens living in the Douglas Fir, Vine Maple and Evergreen neighborhoods can expect noise associated with the use of a vacuum truck that will be used to clean the pipes before repairs are made. The contractors will have trucks parked on the side of the road while the repair work is being performed.