23-1171-REQ_Reiss_Engineering_Report-Palm_Harbor_Transmission_FM_Assessment_2020-11-9.pdf

Reiss Engineering, Inc. Tel: 813.549.0919 3507 East Frontage Road, Suite 180 Fax: 877.349.7146 Tampa, FL 33607 www.reisseng.com

November 9, 2020

Joel Kelsey, P.E.

Pinellas County Utilities Department 14 S. Ft. Harrison Ave., 6th Floor Clearwater, FL 33756

Re: Letter for Klosterman Road, Pinellas Trail, and Camelot Court Force Mains OPCC

Palm Harbor Transmission Force Main Assessment/PID# 004263A

Dear Mr. Kelsey:

In February 2020, Reiss was contracted by Pinellas County to perform the Palm Harbor Transmission Force Main Assessment, which included survey and field condition assessment via ultrasonic thickness testing (UTT) along various force mains within the Palm Harbor region of North Pinellas County.

The results of the Palm Harbor Transmission Force Main Assessment ultrasonic thickness testing (UTT) performed along each force main segment concluded that several force mains have reduced pipe wall thickness readings, most likely due to corrosion over time, and were recommended for repair or replacement. This letter focuses on the Klosterman Road, Pinellas Trail, and Camelot Court force mains, which have been identified as having reduced pipe wall thickness readings. The prior studies indicated to repair or replacement of key sections of the force mains mentioned above. Pinellas County later requested Reiss Engineering, Inc. (Reiss) determine the cost to complete full replacements of the three (3) force mains.

As shown in Figure 1 (see Attachment 1), there are three (3) pipe segments which are outlined along the Klosterman Road and Pinellas Trail force main segments as follows:

• ~5,140-LF 30-inch DI force main (County ID: FM-1258) along the Pinellas Trail.

• ~3,180-LF 30-inch DI force main (County ID: FM-1256, FM-1259, FM-1614) along

Klosterman Road.

• ~800-LF 30-inch PVC force main (County ID: Unknown) along Klosterman Road.

UTT results along the ~5,140-LF segment of 30-inch DI force main along the Pinellas Trail indicated low pipe wall thickness at high points, including two (2) locations which have an existing ARV and one (1) location which does not. A previous condition assessment along Klosterman Road completed in February 2018 by Reiss recommended an approximate ~80-LF segment of 30-inch DI force main be replaced. As shown on Figure 1 and as of November 2020, approximately ~800-LF of 30-inch DI force main has been replaced with new 30-inch PVC force main along Klosterman Road. For the remaining ~3,180-LF of 30-inch DI force main along Klosterman Road and the ~5,140-LF 30-inch DI force main segment along the Pinellas Trail, it is recommended to grout fill the existing 30-inch DI force main and install a new 30-inch PVC or HDPE force main. An opinion of probable construction cost (OPCC) for replacement of ~8,320-LF of 30-inch DI force main is approximately ~$7.56M; a summary of anticipated construction costs is provided in Table 1 (see Attachment 3). The OPCC assumes the force main along Klosterman Road will be replaced near the existing alignment in the median, which will require asphalt replacement and long term temporary traffic control.

As shown in Figure 2 (see Attachment 2), an approximate 1,370-LF 20-inch DI force main (County ID: FM-387) along Camelot Court has several locations which have low pipe thickness readings during UTT testing. It is recommended the existing force main be grout filled and a new 24-inch HDPE force main be installed. To minimize future disturbances to the Camelot Court community, it is recommended that installation of the new 24-inch HDPE force main be completed via horizontal directional drilling (HDD) from the forested area and tie-in north of Camelot Court where the force main continues north towards Loch Road. The new alignment will establish the force main along the eastern property line of the Camelot Court community and will require easement permitting. An OPCC for relocation and replacement of ~1,430-LF of 20-inch DI force main is approximately ~$1.49M; a summary of anticipated construction costs is provided in Table 2 (see Attachment 3).

If you have any questions regarding summary or require additional information, please contact me at

(813) 549-0919 or wthaggen@reisseng.com. We look forward to future discussions with the County, and we thank you for the opportunity to provide these services to Pinellas County.

Regards, REISS ENGINEERING, INC.

Weston Haggen, P.E.

Project Manager

Cc: Elizabeth Harper

Enclosures Attachment 1 – Klosterman and Pinellas Trail Force Main Replacement Attachment 2 – Camelot Court Force Main Replacement Attachment 3 – Opinion of Probable Construction Cost mailto:wthaggen@reisseng.com

ATTACHMENT 1

KLOSTERMAN AND PINELLAS TRAIL FORCE MAIN REPLACEMENT

²

FIGURE 1

PINELLAS COUNTY UTILITIES

PALM HARBOR TRANSMISSION FORCE MAIN ASSESSMENT

KLOSTERMAN AND PINELLAS TRAIL FORCE MAIN REPLACEMENT

P:\154000 Pinellas\00_Projects\154018 - North County FM Assessment\60_Design\06_GIS\_MXDs\APPENDIX E-1.mxd

0 0.5 1

Miles

Legend UTT Results #* 0 - 49 psi #* 50 - 100 psi #* 101 - 150 psi #* 151 - 250 psi #* > 250 psi

Force Main

Pinellas Trail:

~5,140-LF 30-inch DI (PVC Replacement)

Proposed 30" PVC Open Cut 2020 Replaced 30" PVC

Klosterman Road:

~800-LF 30-inch PVC (Replaced)

Klosterman Rd:

~3,180-LF 30-inch DI (PVC Replacement)

ATTACHMENT 2

CAMELOT COURT FORCE MAIN REPLACEMENT

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FIGURE 2

PINELLAS COUNTY UTILITIES

PALM HARBOR TRANSMISSION FORCE MAIN ASSESSMENT

CAMELOT CT FORCE MAIN REPLACEMENT

P:\154000 Pinellas\00_Projects\154018 - North County FM Assessment\60_Design\06_GIS\_MXDs\APPENDIX E-2.mxd

0 0.5 1

Miles

Legend UTT Results #* 0 - 49 psi #* 50 - 100 psi #* 101 - 150 psi #* 151 - 250 psi #* > 250 psi

Force Main Existing 20" Force Main

Total Replacement:

~1,370-LF 24-inch DI (HDPE Installation - HDD)

Proposed 24" HDPE (HDD)

Existing Force Main:

~1,430-LF 20-inch DI (Grout Fill)

ATTACHMENT 3

OPINION OF PROBABLE CONSTRUCTION COST

Item No Description Quantity Unit Unit Price Cost 1 Mobilization/Demobilization (5%) 1 LS 300,000$ 300,000$ 2 Clearing and Grubbing (3%) 1 LS 175,000$ 175,000$ 3 Grout Fill Existing Force Main 8300 LF 45$ 374,000$ 4 30" PVC Force Main, RMJ (Inclusive fittings) 8320 LF 500$ 4,160,000$ 5 30-inch Gate Valve 9 EA 45,000$ 405,000$ 6 Force Main Tanker Bypass for Transfer to new Force Main 1 EA 75,000$ 75,000$

4" ARV Assembly (Inclusive of ARV, offset piping, fittings, enclosure, concrete pad)

5 EA 55,000$ 275,000$

8 Asphalt Milling and Resurfacing 4600 SY 60$ 276,000$ 9 Concrete Curb Removal and Replacement 900 LF 90$ 81,000$

10 Concrete Sidewalk Removal and Replacement 500 SY 110$ 55,000$ 11 Sodding, Restoration 23100 SY 5$ 121,000$ 12 MOT (No. 613) 80 Days 1,250.00$ 100,000$

Subtotal 6,300,000$ 13 1,260,000$

Total 7,560,000$

Item No Description Quantity Unit Unit Price Cost 1 Mobilization/Demobilization (5%) 1 LS 59,000$ 59,000$ 2 Clearing and Grubbing (10%) 1 LS 103,000$ 103,000$ 3 Grout Fill Existing Force Main 1430 LF 35$ 51,000$ 4 24" HDPE Force Main, RMJ (Inclusive fittings, HDD) 1370 LF 450$ 617,000$ 5 20-inch Plug Valve 2 EA 35,000$ 70,000$ 6 Force Main Tanker Bypass for Transfer to new Force Main 1 LS 50,000$ 50,000$

4" ARV Assembly (Inclusive of ARV, offset piping, fittings, enclosure, concrete pad)

2 EA 55,000$ 110,000$

8 Restoration 1 LS 25,000$ 25,000$ 9 Utility Easement (includes permitting) 1 LS 150,000$ 150,000$

Subtotal 1,240,000$ 10 250,000$

Total 1,490,000$ Contingency (20%)

Force Main and ARV Replacements- 30-inch FM Pinellas Trail and Klosterman Preliminary OPCC

Contingency (20%)

Force Main and ARV Replacements- 20-inch main Camelot Court Preliminary OPCC