Attachment 3c Pothole Report.pdf

PPOOTTHHOOLLIINNGG RREEPPOORRTT

U T I L I T Y S U R V E Y O R S , I N C .

PPRREEPPAARREEDD BBYY::

May 3, 2023

785 East Mission Road Ste. 100 I San Marcos, CA 92069 I P.760.480.2347 I F.760.739.8034 I airxus.com

Utility Locating and Potholing Area:

Benton St/VA Loma Linda Parking Structure

Loma Linda, CA

AIRX Project #: 23-109 PF Project Name: Loma Linda VA Parking Structure, Loma Linda

TABLE OF CONTENTS

1. Description of Pothole Procedures and Site-Specific Details

2. Pothole Project Map(s)

3. Pothole Location Map(s)

4. Pothole Tabulation Report

5. Pothole Data Sheet(s)

A I R X U T I L I T Y S U R V E Y O R S , I N C .

Descriptionof

P otholeP roceduresand

S iteS pecificDetails

A IR X U T IL IT Y S U R V E Y O R S , IN C .

DESCRIPTION OF POTHOLE PROCEDURES

AIRX Utility Surveyors performs a full range of specialized engineering services including Underground Utility Location and Vacuum Excavation (to verify depth and alignment of underground utilities).

Underground Utility Location employs sophisticated electronic locating devices to trace the route of an underground utility; then the route is marked on the surface with marking paint in paved areas, or with 60 penny nails and feathers in unpaved areas.

Vacuum excavation employs a vacuum truck in conjunction with high-pressure air or water to excavate material and expose an underground utility. An 8-inch diameter hole is first cored through the pavement so that the vacuum hose and high-pressure air or water hose can be inserted.

Utilities found during potholing are located on the surface by placing two reference points (typically 36” apart) on either side of the pothole along the centerline (or edge) of the utility, using paving nails or 60 penny nails as appropriate. Depth measurements (to the nearest ½ inch) are taken midway between the two reference points.

Utility alignment, depth, and other data is marked with pink paint (on pavement), or on wood lath (unpaved areas).

SITE SPECIFIC DETAILS

AIRX was contracted by Calibre Engineering to perform utility locating and potholing services on Benton St/VA Loma Linda Parking Structure in Loma Linda, California. A total of 3 potholes were excavated to establish conflicts and connection points on a variety of utilities. The results of the data are contained in the attached spreadsheet and data sheets.

In preparation of these excavations, AIRX marked out the dig locations and called in for USA (Underground Service Alert).

All the excavations and discovery went without any incident. Any changes and adjustments are mentioned in the Pothole Tabulation Report and the Pothole Data Sheets. All the results were annotated on the ground and in this report. It is AIRX’s recommendation that all pothole locations and the active mark out should be surveyed to aid in the adjustment of utilities on the final plan and profile.

At each pothole location, the utility alignment was marked with paint. AIRX used potable water acquired offsite for excavation and all water and material vacuumed was disposed of off-site. No water was allowed to flow into storm drains or natural drainages. The potholes were covered with clean backfill material and compacted to 95% density in 3” lifts. All field work was performed on May 2, 2023.

A I R X U T I L I T Y S U R V E Y O R S , I N C .

P otholeP rojectM ap(s)

P otholeL ocationM ap(s)

P otholeT abulationR eport

POTHOLE TABULATION REPORT: Loma Linda VA Parking Structure, Loma Linda

Pothole Number

Date Street Pavement Thickness

Utility Type Utility Size & Material Soil Type Depth-Ground to Top of Utility

Depth-Ground to Top of Package/

Encasement

Depth-Ground to Bottom of Package/

Encasement

Total Depth

Excavated

Utility Orientation

Pothole Project Area

Map #

Pothole Location

Map # Description & Location Notes

1 05/02/2023 Benton St/VA Loma

Linda Parking Structure

Asphalt - N/A Concrete - N/A

Base - N/A Total - N/A

Unknown Unknown

Target Utility (Not Found)

6.0″ PVC

12.0″ Concrete

N/A Subgrade

51.0″ T/P 85.0″ T/P

N/A

N/A N/A N/A

N/A N/A N/A

96.0”

NNW/SSE

WSW/ENE

N/A

1 1 Pothole 1 is located east of Benton St/NW of VA Loma Linda Parking Structure. Please refer to Location Map 1 for the approximate location of Pothole 1.

2 05/02/2023 Benton St/VA Loma

Linda Parking Structure

Asphalt - N/A Concrete - N/A

Base - N/A Total - N/A

Water Unknown Unknown Unknown

Electric (Not Found)

6.0″ PVC

12.0″ Concrete

1.0″ Steel 4.0″ Steel

N/A

Subgrade

40.0″ T/P 85.0″ T/P 66.0″ T/P 62.0″ T/P

N/A

N/A N/A N/A N/A N/A

N/A N/A N/A N/A N/A

85.0”

NNW/SSE

WSW/ENE

NNW/SSE

NNW/SSE

N/A

1 1 Pothole 2 is located east of Benton St/NW of VA Loma Linda Parking Structure. Please refer to Location Map 1 for the approximate location of Pothole 2.

3 05/02/2023 Benton St/VA Loma

Linda Parking Structure

Asphalt - N/A Concrete - N/A

Base - N/A Total - N/A

Unknown Unknown

Target Utility (Not Found)

4.0″ PVC

12.0″ Concrete

N/A Subgrade

60.0″ T/P 48.0″ T/P

N/A

N/A N/A N/A

N/A N/A N/A

96.0”

NNE/SSW

NNE/SSW

N/A 1 1

Pothole 3 is located east of Benton St/NW of VA Loma Linda Parking Structure. Please refer to Location Map 1 for the approximate location of Pothole 3.

P otholeDataS heet(s)

RECORD OF TEST HOLE DATA

AIRX JOB NO: 23-109 PF

TEST HOLE NO: 1

DATE EXCAVATED: 05/02/2023

UTILITY

TYPE

SIZE &

MATERIAL

UTILITY

DEPTH

ENCASEMENT/

PACKAGE TOP

ENCASEMENT/

PACKAGE BOTTOM

UTILITY

DIRECTION

1 Unknown 6.0″ PVC 51.0″ T/P N/A N/A NNW/SSE

2 Unknown 12.0″ Concrete 85.0″ T/P N/A N/A WSW/ENE

Target Utility (Not

Found) N/A N/A N/A N/A N/A

TOTAL DEPTH EXCAVATED: 96.0”

PAVEMENT THICKNESS: ASPHALT: N/A CONCRETE: N/A BASE: N/A

STANDBY REQUIRED: N/A

IMMEDIATE SURFACE REPAIR: Class II Base

PERMANENT SURFACE REPAIR: Class II Base

TARGET UTILITY MARKED BY USA: Yes TRACER WIRE FOUND: No

MARKOUT LOCATION CORRECT: No PIPE COVER MATERIAL: Subgrade

UTILITY SHOWN ON PLAN: Yes OVERBURDEN MATERIAL: Subgrade

COMMENT:

Pothole 1 is located east of Benton St/NW of VA Loma Linda Parking Structure. Please refer to Location Map 1 for the approximate location of Pothole 1. The photo above was taken in front of Pothole 1 and Pothole 2 facing north.

A downhole view of the utilities found in Pothole 1 and their orientation at the pothole location: 6.0 inch PVC Unknown utility at the depth of

51.0 inches T/P and runs in a NNW/SSE direction; and 12.0 inch Concrete Unknown utility at the depth of 85.0 inches T/P and runs in a WSW/ENE direction. Utilities were found directly on markout.

AREA SHOT DOWNHOLE VIEW

PH-2 PH-1

TEST HOLE NO: 2

DATE EXCAVATED: 05/02/2023

UTILITY

TYPE

SIZE &

MATERIAL

UTILITY

DEPTH

ENCASEMENT/

PACKAGE TOP

ENCASEMENT/

PACKAGE BOTTOM

UTILITY

DIRECTION

1 Water 6.0″ PVC 40.0″ T/P N/A N/A NNW/SSE

2 Unknown 12.0″ Concrete 85.0″ T/P N/A N/A WSW/ENE

3 Unknown 1.0″ Steel 66.0″ T/P N/A N/A NNW/SSE

4 Unknown 4.0″ Steel 62.0″ T/P N/A N/A NNW/SSE

5 Electric (Not Found) N/A N/A N/A N/A N/A

TOTAL DEPTH EXCAVATED: 85.0”

PAVEMENT THICKNESS: ASPHALT: N/A CONCRETE: N/A BASE: N/A

STANDBY REQUIRED: N/A

IMMEDIATE SURFACE REPAIR: Class II Base

PERMANENT SURFACE REPAIR: Class II Base

TARGET UTILITY MARKED BY USA: Yes TRACER WIRE FOUND: No

MARKOUT LOCATION CORRECT: No PIPE COVER MATERIAL: Subgrade

UTILITY SHOWN ON PLAN: Yes OVERBURDEN MATERIAL: Subgrade

COMMENT:

Pothole 2 is located east of Benton St/NW of VA Loma Linda Parking Structure. Please refer to Location Map 1 for the approximate location of Pothole 2. The photo above was taken in front of Pothole 2 and Pothole 1 facing ENE.

A downhole view of the utilities found in Pothole 2 and their orientation at the pothole location: 6.0 inch PVC Water utility at the depth of 40.0 inches T/P and runs in a NNW/SSE direction; 12.0 inch Concrete Unknown utility at the depth of 85.0 inches T/P and runs in a WSW/ENE direction; 1.0 inch Steel Unknown utility at the depth of

66.0 inches T/P and runs in a NNW/SSE direction; and 4.0 inch Steel Unknown utility at the depth of 62.0 inches T/P and runs in a NNW/SSE direction. Utilities were found directly on markout.

PH-2 PH-1

TEST HOLE NO: 3

DATE EXCAVATED: 05/02/2023

UTILITY

TYPE

SIZE &

MATERIAL

UTILITY

DEPTH

ENCASEMENT/

PACKAGE TOP

ENCASEMENT/

PACKAGE BOTTOM

UTILITY

DIRECTION

1 Unknown 4.0″ PVC 60.0″ T/P N/A N/A NNE/SSW

2 Unknown 12.0″ Concrete 48.0″ T/P N/A N/A NNE/SSW

Target Utility (Not

Found) N/A N/A N/A N/A N/A

TOTAL DEPTH EXCAVATED: 96.0”

PAVEMENT THICKNESS: ASPHALT: N/A CONCRETE: N/A BASE: N/A

STANDBY REQUIRED: N/A

IMMEDIATE SURFACE REPAIR: Class II Base

PERMANENT SURFACE REPAIR: Class II Base

TARGET UTILITY MARKED BY USA: Yes TRACER WIRE FOUND: No

MARKOUT LOCATION CORRECT: No PIPE COVER MATERIAL: Subgrade

UTILITY SHOWN ON PLAN: Yes OVERBURDEN MATERIAL: Subgrade

COMMENT:

Pothole 3 is located east of Benton St/NW of VA Loma Linda Parking Structure. Please refer to Location Map 1 for the approximate location of Pothole 3. The photo above was taken in front of Pothole 3 facing SW.

A downhole view of the utilities found in Pothole 3 and their orientation at the pothole location: 4.0 inch PVC Unknown utility at the depth of

60.0 inches T/P and runs in a NNE/SSW direction; and 12.0 inch Concrete Unknown utility at the depth of 48.0 inches T/P and runs in a NNE/SSW direction. Utilities were found directly on markout.

PH-3