Attachment 9 - Underground Utility Locating.pdf

Summary of Underground Utility Locating

Prepared For: Triple C - The A&E Group Prepared By:

Eric Whritenour Eric.Whritenour@gprsinc.com

Project Manager 3 -NYC30 484.885.4147

November 2, 2023

November 2, 2023

Triple C - The A&E Group

Attn: Mat Perkins

Email: Mat.perkins@triplecaeg.com

Site: 555 Willard ave, Newington CT

We appreciate the opportunity to provide this report for our work completed on October 31, 2023.

PURPOSE

The purpose of the project was to search for Fiber Lines through all manholes and vaults within the project boundaries provided by the client. The scope of work consisted of 23 Manhole Locations. The utilities were traced out on site. Markings were applied around Manhole/Vault locations to show where the lines travel. Full mark-out of all Communications Lines located is shown on the Map below and separate .KMZ map.

EQUIPMENT

• Underground Scanning GPR Antenna. The antenna with frequencies ranging from 250 MHz-450 MHz is mounted in a stroller frame which rolls over the surface. The surface needs to be reasonably smooth and unobstructed in order to obtain readable scans. Obstructions such as curbs, landscaping, and vegetation will limit the feasibility of GPR. The data is displayed on a screen and marked in the field in real time.

The total depth achieved can be as much as 8’ or more with this antenna but can vary widely depending on the types of materials being scanned through. Some soil types such as clay may limit maximum depths to 3’ or less. As depth increases, targets must be larger in order to be detected and non-metallic targets can be especially difficult to locate. Depths provided should always be treated as estimates as their accuracy can be affected by multiple factors. For more information, please visit: Link

• Electromagnetic Pipe Locator. The EM locator can passively detect the electromagnetic fields from live AC power or from radio signals travelling along some conductive utilities. It can also be used in conjunction with a transmitter to connect directly to accessible, metallic pipes or tracer wires. A current is sent through the pipe or tracer wire at a specific frequency and the resulting EM field can then be detected by the receiver. A utility’s ability to be located depends on a variety of factors including access to the utility, conductivity, grounding, interference from other fields, and many others. Depths provided should always be treated as estimates as their accuracy can be affected by multiple factors. For more information, please visit: Link

• Traceable Rodder. The rodder has a copper wire encased in fiberglass. The line is pushed through accessible pipes before placing a current on the wire which is then traced from the surface. The maximum traceable depth is 10’ depending on the soil conditions and the maximum distance is 300’. The line can be pushed through a pipe with direct access such as a sewer line at a cleanout or a storm drain catch basin.

It may not be able to be pushed through deeper pipes within manholes and conduits will not be accessed by GPRS. The signal cannot be located through metallic pipes. For more information, please visit: Link

• GPS. This handheld GPS unit offers accuracy down to 4 inches; however, the accuracy will depend on the satellite environment and obstructions and should not be considered to be survey-grade. Features can be collected as points, lines, or areas and then exported into

Google Earth or overlaid on a CAD drawing. For more information, please visit: Link https://www.gp-radar.com/350-400-mhz-gpr-antenna http://www.gprsinc.com/ https://www.gp-radar.com/Magnetometer-GA-52Cx-Manual.html https://www.gp-radar.com/gprs-data-sheets

PROCESS

The process typically begins with using the EM pipe locator to locate pipes or utilities throughout the scan area. First, the transmitter is used to connect to and trace any visible risers, tracer wires, or accessible, conductive utilities provided that there is an exposed, metallic surface. The areas are then swept with the receiver to detect live power or radio frequency signals. Locations and depths are painted or flagged on the surface. Depths cannot always be provided depending on the location method and can be prone to error.

Initial GPR scans were then collected in order to evaluate the data and calibrate the equipment. Based on these findings, a scanning strategy is formed, typically consisting of scanning the entire area in a grid with 3’-5’ scan spacing in order to locate any potential utilities that were not found with the pipe locator. The GPR data is viewed in real time and anomalies in the data are located and marked on the surface along with their depths using spray paint, pin flags, etc.

LIMITATIONS

Please keep in mind that there are limitations to any subsurface investigation. The equipment may not achieve maximum effectiveness due to soil conditions, above ground obstructions, reinforced concrete, and a variety of other factors. No subsurface investigation or equipment can provide a complete image of what lies below. Our results should always be used in conjunction with as many methods as possible including consulting existing plans and drawings, exploratory excavation or potholing, visual inspection of above-ground features, and utilization of services such as One Call/811. Depths are dependent on the dielectric of the materials being scanned so depth accuracy can vary throughout a site. Relevant scan examples were saved and will be provided in this report.

FINDINGS

The subsurface conditions at the time of the scanning allowed for maximum GPR depth penetration of 2’-3’ in most areas. This Project was to scan and locate all locatable Fiber lines in the area shown on the map provided by the client. No other utilities were scanned for. We opened all accessible fiber manholes and used our Induction clamp to locate the lines. If the clamp did not yield the results we wanted, We would then proceed to use our duct rodder to locate the lines. Please see below for the Map and photos for this project.

Please note that you will see 2 different types of fiber lines on this map. The First one being “communication line duct”, which represents all the lines that we were able to confirm in the field. Second ones being “Map shown communication line”, these were lines that the map showed that we did not see in the field. There looked to already have been some fiber work on the property so the map may have been a bit outdated. The buildings that were down in the VA housing area are abandoned and no longer in use. I was told we didn’t have access to those buildings due to safety concerns. Any lines you see that end with an EOI represents the last traceable point for that line. This will mostly be seen with the lines that appear to be in conjunction with those previously mentioned abandoned buildings.

Prepared for:

Prepared By:

Date of Scanning:

Terms and Conditions GPRS does not provide land survey or civil engineering data collection or documentation. This is provided as a reference map of the field markings and is not survey-grade.

LEGEND

555 Willard ave, Newington CT

Prepared by:

ELECTRIC SANITARY

WATER STORM

COMM UNKNOWN

GAS

Prepared for:

Prepared By:

Date of Scanning:

Terms and Conditions GPRS does not provide land survey or civil engineering data collection or documentation. This is provided as a reference map of the field markings and is not survey-grade.

LEGEND

555 Willard ave, Newington CT

Prepared by:

ELECTRIC SANITARY

WATER STORM

COMM UNKNOWN

GAS

Manhole layout mark up

The area circled in red shows an area where potential bleedover may have happened. There was an Electrical ductbank running right next to the fiber bank in this location. Signal appeared to stay on the fiber lines but just be aware.

Manhole 1. Full of water. Lines run east and west

Manhole 2. Penetrations are East and west at appx 48” deep

Manhole 3. Penetrations are East and west at appx 48” deep

Manhole 4. Penetrations are East and west at appx 48” deep

Manhole 5. Penetrations are North, East and west at appx 48” deep

Manhole 6. Penetrations are North, East and south at appx 52” deep

Manhole 7. Sealed shut. No passive signals

Manhole 8. Penetrations are North, East and south at appx 36” deep

Manhole 9. Penetrations are West and south at appx 36” deep

Manhole 10. Penetrations are West and East at appx 36” deep

Manhole 11. No passive signal. Looks abandoned

Manhole 12. No access. Lines run North and South at 36”

Manhole 13. Penetrations are West and East at appx 36” deep

Manhole 14. No access. In locked construction area

Manhole 15. Penetrations are West and East at appx 36” deep

Manhole 16. Penetrations are North, West and East at appx 48” deep

Manhole 17. Full of water. North and East at appx 48” deep

Manhole 18. Penetrations are North and south at appx 36” deep

Manhole 19. Full of water. North and south at appx 36” deep

Manhole 20. Penetrations are North and south at appx 24” deep

Manholes 21, 22 and 23 are full of water. These are the holes near the abdn buildings.

CLOSING

GPRS, Inc. has been in business since 2001, specializing in underground storage tank location, concrete scanning, utility locating, and shallow void detection for projects throughout the United States. I encourage you to visit our website (www.gprsinc.com) and contact any of the numerous references listed.

Summarize findings here if applicable:

GPRS appreciates the opportunity to offer our services, and we look forward to continuing to work with you on future projects. Please feel free to contact us for additional information or with any questions you may have regarding this report.

Signed, Eric Whritenour

Project Manager 3 —NYC30

Direct: 484.885.4147

Eric.Whritenour@gprsinc.com www.gprsinc.com

Reviewed, Direct:

www.gprsinc.com https://www.gp-radar.com/Sondes-User-Guide.html https://www.gp-radar.com/GatorCam4-brochure.html https://www.gp-radar.com/200-270-mhz-gpr-antenna

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