GCSD: Sewer Rehab Project Underway

By Roni Lynn Rudy

The Big Oak Flat/Groveland Sewer Collection System Renovation Project is

moving along on schedule, with the first portion of the construction taking place

behind the District office and in Big Oak Flat. The Pine Mountain Lake portion of

the project is scheduled to begin on August 12, 2022.


The massive project is needed to prevent sewer system blockages and sanitary

sewer overflows and to provide adequate and reliable sewer service to all

District customers. The District’s existing treatment and collection system was

built in 1941. Significant additions were made in 1982 and the system was last

upgraded in 1990. The sewer collection system is significantly aged and some

of the older portions of the system experience blockages and require regular

cleaning to avoid an increase in breakages. The physical condition of some of

these sewer lines is suspected to be poor, in some instances they may be

beyond their life expectancy, and may need to be replaced or rehabilitated.

Indicators of these conditions have been failing manholes and infiltration and

inflow issues in recent years.


The Project includes the rehabilitation or replacement of approximately 11,500

linear feet of existing sewer main, performing spot repairs as shown on the

plans, construction of 19 new sanitary sewer manholes, rehabilitation of 46

existing sanitary sewer manholes, and the installation on 1 new flushing branch

within the GCSD sewer collection system.


Construction costs for the Sewer Collection System Improvements Project will be covered in part by the Clean Water State Revolving Fund (CWSRF) funding

grant. The funding agreement states that 75% ($4,384,176.00) of the funds will

be provided via grant and 25% ($1,461, 392.00) via loan. The loan portion will

have an interest rate of 1.4% annually for 30 years.


Planned Sewer system improvements in Big Oak Flat:

• Replace approximately 455 linear feet of 6-inch sewer pipe using open trench

excavation methods.

• Rehabilitate approximately 792 linear feet of 6-inch sewer pipe using “trench

less” cured-in-place methods.

• Perform spot repairs to resolve pipe anomalies at two locations.

• Construct new manholes.

• Bring existing manhole lids up to grade.

• Install sealed or locking manhole lids.


Planned Sewer system improvements in Groveland:

• Replace approximately 408 linear feet of 8-inch sewer pipe and 258 linear feet

of 6 inch sewer pipe with open trench excavation methods.

• Rehabilitate approximately 1,413 linear feet using “trench less” cured-in-place

methods.

• Rehabilitate and install sealed or locking manhole lids.


Planned Sewer system improvements in Pine Mountain Lake:

• Replace approximately 2,715 linear feet of 6-inch sewer pipe using open

trench excavation methods.

• Perform spot repairs in sections where pipe abnormalities were detected

Many of the sewer lines being replaced and rehabilitated as part of the sewer

collection system project are located on and/or adjacent to private property. In

many cases these utilities are located in very narrow District easements or

public utility easements, between 8 and 20 feet in width. The minimum width in

which the contractor can typically safely complete excavation and utility

replacement is 20 to 30 feet. Therefore, in cases where the contractor must get

a backhoe, dump truck and materials onto private property, they may need both

temporary access rights as well as more room along the permanent easement

for this temporary construction work.


In addition, the District Team has identified locations where having a temporary

easement “strip” for a more convenient temporary access route or material

staging area will cause much less property damage. In some cases, we may not

have access at all for construction and a permanent or temporary easement is

needed. There was an approval on a recent agenda item to provide flexibility for

the General Manager, Pete Kampa, to negotiate temporary and permanent

access and obtain easement rights across private property to safely and

efficiently complete the sewer system rehabilitation project. After executing said

easement deeds, Kampa will bring them to the board for ratification at the

following Regular Board Meeting.


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