City of Santa Rosa image CIP

Capital Improvement Project

Cobblestone Dr Zone R2-R4 Water Main Connection

Estimated Construction Schedule: Slated to begin August, 2019 and is anticipated to be completed July, 2020.
Construction Contract Amount: Pending
Project ID #: 1999
Description: Several fire hydrants serving approximately 32 homes at the north end of Cobblestone Dr have sub-optimal fire flow ranging from approximately 752 gpm at 20 psi to 1329 gpm at 20 psi. A new 8" pipeline is proposed to connect the existing pipeline in Tillmont Way (or less likely, Kelsey Knolls) (located in the City's Pressure Zone R2) to the existing 6-inch diameter pipeline located in Cobblestone Drive (located in Pressure Zone R4). A new pressure regulator with 1 1/2" bleed (to keep water circulating) is required to maintain the pressure zone break between R2 and R4.

Winter-Spring 2018: Environmental and Geotechnical studies are beginning. Some soil sound wave studies and borings will be necessary possibly using a small backhoe. Alternative route being studied.


Andrew Wilt
Associate Civil Engineer
City of Santa Rosa

Cy Penry
Civil Engineering Tech III
City of Santa Rosa
(707) 529-9210

Ben Bryant
Consultant Design Engineer
Brelje and Race
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Project Image

Note: All dates and times are subject to change.