2024.07.02 - Olean Sewer Replacement & Levee Restoration.pdf

Sanitary Sewer Pipe Repair and

Olean Creek Levee Reconstruction

City of Olean – Department of Public Works

Design Drawings

Prepared by

McMahon & Mann Consulting Engineering and Geology, P.C.

PREPARED BY: PREPARED FOR:

City of Olean - Department of Public Works 101 East State Street

Olean, New York 14760

OLEAN FLOOD PROTECTION LEVEE

CONTRACT PLANS

SHEET DESCRIPTION

TITLE PAGE

SUMMARY OF QUANTITIES AND GENERAL NOTES

McMahon & Mann Consulting Engineering and Geology, P.C.

2495 Main Street, Suite 432 Buffalo, NY 14214

(716) 834-8932 www.mmce.net

OLEAN, NEW YORK

INDEX OF PLANS

JUNE 2024

DWG. NO. 23021-007a

EXISTING CONDITIONS PLAN AND EXISTING CONDITIONS CROSS SECTION

SITE ACCESS PLAN

EXCAVATION PLAN, EXCAVATION CROSS SECTION, AND EXCAVATION PROFILE

FINAL GRADING PLAN, FINAL GRADING CROSS SECTION, AND FINAL GRADING PROFILE

FINAL GRADING AND MANHOLE CONNECTION DETAILS

ITEM

NUMBER ITEM DESCRIPTION UNIT ESTIMATED

QUANTITY

ACTUAL

QUANTITY

DIVISION 02 - EXISTING CONDITIONS

022100-4.1 SURVEYING AND RECORD PLANS LUMP SUM 1

024300-4.1 SANITARY BYPASS SYSTEM LUMP SUM

311100-4.1 TOPSOIL REMOVAL CUBIC YARD

312219-4.3 REVEGETATION ACRE

312319-4.1 EXCAVATION DEWATERING LUMP SUM

312323-4.1 SLOPED EXCAVATION

312323-4.2 SOIL TESTING (SLOPED EXCAVATION AND

RELIEF TRENCH EXCAVATION)

312323-4.3 TRENCH EXCAVATION AND DISPOSAL

312323-4.4 FLOWABLE FILL

312323-4.5 SUITABLE FILL - ONSITE

312323-4.6 SUITABLE FILL - OFFSITE

312323-4.7 FIELD DENSITY TESTING (SUITABLE FILL)

312323-4.8 RELIEF TRENCH CONNECTION

312500-4.1 EROSION AND SEDIMENTATION CONTROL

330100-4.1 PIPE PROTECTION

330130-4.1 PIPE VERIFICATION

333000-4.1 REMOVAL AND DISPOSAL OF EXISTING

SANITARY PIPE

333000-4.3 INSTALLATION OF NEW SANITARY PIPE

DIVISION 31 - EARTHWORK

LUMP SUM

LUMP SUM

DIVISION 33 - UTILITIES

LUMP SUM

LUMP SUM

LINEAR FEET

LINEAR FEET

0.31

3,500

3,500

CUBIC YARD

CUBIC YARD

CUBIC YARD

CUBIC YARD

312219-4.2

312219-4.1 TOPSOIL - ONSITE

TOPSOIL - OFFSITE

ACRE

CUBIC YARD

CUBIC YARD

LUMP SUM

LINEAR FEET

0.31

SUMMARY OF QUANTITIES

ABBREVIATIONS FOR CONTRACT PLANS

C.I.P. CAST IRON PIPE

C.M. CORRUGATED METAL

C.M.P. CORRUGATED METAL PIPE

DIA. DIAMETER

DWG. DRAWING

EL. ELEVATION

INV. INVERT

MAX. MAXIMUM

M.H. MANHOLE

MIN. MINIMUM

NO. NUMBER

NYSDEC NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION

OSHA OCCUPATIONAL SAFETY AND HEALTH ORGANIZATION

P.V.C. POLYVINYL CHLORIDE

SAN. SANITARY

SDR STANDARD DIMENSION RATIO

STORM. STORMWATER

USACOE UNITED STATES ARMY CORPS OF ENGINEERS

USGS UNITED STATES GEOLOGICAL SURVEY

GENERAL NOTES

1. The project involves the removal and replacement of a damaged sanitary sewer pipe buried under a flood protection levee in the City of Olean. The project will require excavation of the flood protection levee to reach the pipe and backfill placement to restore the site to preconstruction conditions after replacement of the sanitary pipe. The flood protection levee under this project is located on the east side of Olean Creek.

2. The provided Technical Specifications should be used in conjunction with the Contract Plans. The pay item numbers shown on the Contract Plans for specified material and construction activities are in accordance with the Technical Specifications.

3. Subsurface explorations have been completed for this project at the locations indicated on Sheet 3 of the Contract Plans. Boring logs, groundwater monitoring well installation logs, and other subsurface information shall be made available for the inspection of bidders.

4. Unless otherwise noted or approved by the Engineer, construction work is to be accomplished in the sequence as shown on the Contract Plans and as described in the Technical Specifications.

5. The Contractor shall supply a materials list of chemicals to be used or stored on the job site. This shall include material safety data sheets and documentation of worker training.

6. Access for rescue and fire fighting equipment and personnel shall be maintained at all times. The rescue and fire fighting operations shall have right-of-way over all Contractor's operations at all times.

7. The Contractor shall refer to the Technical Specifications for time constraints and construction scheduling.

8. All elevations shown on the Contract Plans are based on NAVD 88.

9. The Contractor shall examine and verify, in the field, all conditions and dimensions. The Contractor shall take all field measurements to ensure proper fit of the finished work, and the contractor shall assume full responsibility for their accuracy. If field conditions and dimensions differ from those shown on the Contract Plans, the Contractor shall use the field conditions and dimensions and make the appropriate changes to those shown on the Contract Plans, as approved by the Engineer. When shop drawings based on field measurements are submitted for approval, the field measurements made shall be indicated on the shop drawings submitted for reference of the reviewer.

10. The Contractor's attention is directed to the fact that, due to the nature of reconstruction projects, the exact extent of reconstruction work cannot always be accurately determined prior to the commencement of work. The Contract Plans and Technical Specifications have been prepared based on field inspection, historical construction drawings, and other information available at the time. Actual field conditions may require modifications to construction details and work quantities. The Contractor shall perform the work in accordance with field conditions.

11. The Contractor will be held responsible for all damage to existing utilities and structures caused by its operations which are not included as part of the intended work. All damage to the existing structures which are not part of the intended work shall be repaired by the Contractor without cost to the Owner, and to the satisfaction of the Engineer and Owner.

12. The Contractor shall conduct its operations to the satisfaction of the Owner to prevent or reduce to a minimum any damage to any waterway from pollution by debris, sediment, or other foreign material, or from the manipulation of equipment and/or materials in or near Olean Creek. The Contractor shall not return directly to a stream, or to a ditch immediately flowing into a stream, any water which has been used for wash purposes or other similar operations which could cause this water to become polluted with sand, silt, cement, oil, or other impurities.

13. Visibly turbid discharges from dewatering operations or excavation activities shall not be allowed to enter any waterway. The Contractor shall be responsible for all measures necessary to eliminate the turbidity prior to discharge.

14. Erosion and sedimentation control measures are described on the Contract Plans and in the Technical Specifications (Section 31 25 00 - Erosion and Sedimentation Control). The Contractor shall modify the controls as necessary to accommodate its operations, and obtain approval by the Engineer and Owner prior to implementing any changes.

15. The Contractor shall contact Dig Safely New York in advance of any digging to avoid interruption of service provided by underground utilities. The phone number is 811.

16. Should utilities be encountered during construction which interfere with the work and for which provisions are not provided on the Contract Plans, the Contractor shall immediately notify the Engineer and Owner of their existence and extent of conflict with the work. The Contractor shall make arrangements with the owning agency to modify the site in order to allow the work to progress. Any adjustments to contract quantities as a result of such utility conflicts will be paid for at contract unit prices.

17. Location of utilities, public and/or private, indicated as existing and/or to be constructed as shown on the Contract Plans, are approximate only. Their exact location shall be determined in the field. Additional utility lines, whether abandoned or in service, may exist and it shall be the Contractor's responsibility to conduct its operations and take the necessary precautions to prevent interference with or damage to these or other facilities during the course of construction.

18. In the event the Contractor damages an existing utility service, causing an interruption in said service, it shall immediately commence work to restore service and may not cease its work operation until service is restored. Any damage caused by the Contractor's operations shall be repaired by the Contractor at no cost to the Owner.

19. The Contractor is to be aware that the water level in Olean Creek varies depending on evaporation, rainfall within the watershed, and downstream discharge. The Owner has indicated that the anticipated rise in water level in the creek is delayed several days following a significant precipitation event.

20. Work for this project is to be conducted during late summer/early fall when the water level historically in the creek has been at its lowest levels.

FLOOD EMERGENCY OPERATION PLAN NOTES

1. The Contractor shall monitor the forecasted and actual precipitation within the Olean Creek watershed and the potential effects on the water level in Olean Creek at the construction site. Early preventative action can be critical should a rain event be predicted. Coordination and consultation with the Owner is required during critical periods of construction. Prior to the start of construction, the NYSDEC and USACE shall determine and provide to the Contractor the "action" stage level of the creek that will initiate the flood emergency operation plan.

2. There are two USGS gaging stations located downstream of the project site. The first gaging station is USGS Gage 03010810 "Olean Creek at Olean NY" - this gaging station is located within Olean Creek and is shown to be deactivated. The second gaging station is USGS Gage 03010820 "Allegheny River at Olean NY" - this active gaging station is located along the Allegheny River at the City of Olean wastewater treatment plant.

3. The Contractor will be required to install a temporary staff gage along the bank of Olean Creek to monitor the water level in the creek, Item No. 022100-4.1, prior to the commencement of earthwork. The gage should be placed so that it is visible without obstructions throughout the construction schedule and so that it remains visible at increasing water levels. The gage should have graduated marks at each tenth of a foot of height and it should have additional distinctive marks at each whole foot. The "action" stage level determined for the construction site will be measured with respect to this temporary staff gage. The Contractor shall observe the stage level of the creek at the beginning and end of every day and shall report its observations to the Engineer and Owner.

4. Prior to the commencement of earthwork, the Contractor will be required to coordinate with the Engineer and Owner the criteria for backfill placement and compaction in the event of the "action" stage level of the creek. The criteria should be in general accordance with the Technical Specifications (Earthwork - Section 312323).

5. In the event the floodwaters are predicted to reach an "action" stage level within a 48-hour time span as identified by the NYSDEC and USACE, the Contractor must initiate the closure of the flood protection levee excavation as follows:

a. Stop all work, temporarily cover/cap-off exposed sanitary piping to a sealed condition, and remove any temporary excavation dewatering measures.

b. Backfill the excavation with stockpiled suitable fill material located near the excavation as indicated on Sheet 4 of the Contract Plans. The backfill shall be placed and compacted in general accordance with Note 4 of the Flood Emergency Operation Plan Notes.

d. Provide a 14-foot top width flood protection levee crest and match the existing embankment slopes on both the upstream and downstream sides.

e. Provide erosion and sedimentation control measures on the downstream slopes to prevent soil erosion during the "action" event.

f. When flood waters recede below the "action" stage level, the Contractor can resume work, at their own risk, by re-excavating the work area to the condition it was prior to the "action" event.

6. Contractor to notify the Engineer and Owner immediately upon enactment of flood protection levee excavation closure. A project contact list will be composed upon award of contract so that all involved parties remain informed.

7. The costs associated with the Flood Emergency Operation Plan will be negotiated in the event of the "action" stage level of the creek.

333000-4.2 REMOVAL AND DISPOSAL OF 1949

SANITARY MANHOLE LUMP SUM 1

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A.J.N. / T.W.S.

N.T.S.

23021-007b

DESIGNED BY:

JUNE 2024

DWG. NO.

SHEET:

JOB NO.

DATE:

SCALE:

23-021

CHECKED BY:

0REVISION NUMBER -

K.M.M.

K.M.M.DRAWN BY:

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PLAN LEGEND

EXISTING GROUND CONTOURS

(SEE NOTE 1)

CREST OF FLOOD CONTROL

LEVEE

APPROXIMATE EDGE OF OLEAN

CREEK (DECEMBER 22, 2023)

RELIEF TRENCH LIMITS

(SEE NOTE 3)

BORING LOCATION,

DESIGNATION, AND GROUND

SURFACE ELEVATION

(SEE NOTE 4)

EXISTING CONDITIONS PLAN LEGEND NOTES

1. Base map adapted from survey completed by KHEOPS

Architecture, Engineering & Survey, DPC, dated December 2023.

2. The locations of the underground structures and utilities were adapted from the drawings titled, "Plan and Profile Sanitary Sewer

Reconstruction Boardmanville Outlet Sewer," prepared by City of

Olean, N.Y. Engineering Department, dated August 1949 and

"Olean Flood Protection Project, Unit Two, Allegheny River Olean, NY, Plan & Profile - Olean Creek, STA. 380+00 to STA. 394+00, STA. 578+00 to STA. 579+00," prepared by Knappen Engineering

Co. and Department of the Army Corps of Engineers, dated

December 1951.

3. The limits of the relief trench were adapted from the drawings titled, "Olean Flood Protection Project, Unit Two, Allegheny River

Olean, NY, Plan & Profile - Olean Creek, STA. 380+00 to STA.

394+00, STA. 578+00 to STA. 579+00," prepared by Knappen

Engineering Co. and Department of the Army Corps of Engineers, dated December 1951 and "Olean Flood Protection Project, Unit

Two, Allegheny River Olean, NY, Plan & Profile - Allegheny River, STA. 9+00 to STA. 23+00," prepared by Knappen Engineering Co.

and Department of the Army Corps of Engineers, dated June

1952.

4. Borings and groundwater monitoring wells installed in November

2023 by Earth Dimensions, Inc. Boring and groundwater monitoring well locations and ground surface elevations were adapted from the topographic survey completed by KHEOPS

Architecture, Engineering & Survey, DPC, dated December 2023.

EXISTING SANITARY MANHOLE

TOP OF STREAMBANK

BOTTOM OF STREAMBANK

EXISTING HANDRAIL

STONE LINED ACCESS ROAD

BORING AND GROUNDWATER

MONITORING WELL LOCATION,

DESIGNATION, AND GROUND

SURFACE ELEVATION

(SEE NOTE 4)

EXISTING CONCRETE LIMITS

EXISTING STRUCTURE

EXISTING STORMWATER PIPE

TO REMAIN

EXISTING SANITARY PIPE TO

REMAIN

APPROXIMATE LIMITS OF

OBSERVED SINKHOLE

B-3-23

GS. EL. 1420.7

B-1-23

GS. EL. 1429.9

1949 SANITARY MANHOLE

(SEE NOTE 2)

ABANDONED 15-INCH DIAMETER

SANITARY PIPE (SEE NOTE 2)

REMOVED 24-INCH DIAMETER

CONCRETE DRAIN PIPE (SEE NOTE 2)

EXISTING BRUSH LINE

DAMAGED SANITARY PIPE TO BE

REPLACED

O L E

A N

C R

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K

18-INCH DIA.

STORM. PIPE

CONCRETE CULVERT

HEADWALL AND

WINGWALLS

CONCRETE CULVERT

HEADWALL AND

WINGWALLS

STORM. M.H.

CONCRETE CULVERT

HEADWALL AND

WINGWALLS

INV. EL. 1414.41

INV. EL. 1414.21

SAN. M.H. - NO. GV59

RIM EL. 1429.7

DAMAGED 15-INCH

DIA. C.M.P. (TO BE

REPLACED)

CHANNEL INVERT

EL. 1407.19

CHANNEL INVERT

EL. 1407.22 INV. EL. 1408.44

(PIPE UNDERWATER)

SAN. M.H. - NO. N0A1

RIM EL. 1418.1

INV. EL. 1408.32

10-INCH DIA. C.M.P.

24-INCH DIA. STORM. PIPE

INV. EL. 1414.43

APPROXIMATE LIMITS OF

SINKHOLE OBSERVED

ON THE INBOARD SIDE

(FEBRUARY 2023)

INV. EL. 1407.77

INV. EL. 1408.75

SAN. M.H. - SOUTH

RIM EL. 1420.6

TEMPORARY SHED

TO BE REMOVED

BY OWNER

10-INCH DIA. C.M.P

B-2-23

GS. EL. 1430.2

15-INCH DIA. C.M.P.

INV. EL. NOT KNOWN

15-INCH DIA. C.I.P. CONTINUES

BELOW CREEK

3 3 1

15-INCH DIA. C.M.P. EXTENDS

AN ADDITIONAL 228 FEET

NORTH TO SAN. M.H. - NORTH

PREVIOUSLY REMOVED

24-INCH DIA. CONCRETE

DRAIN PIPE

PREVIOUSLY ABANDONED 15-INCH

DIA. SAN. PIPE - CONDITION TO BE

FIELD VERIFIED

B-1-23

GS. EL. 1429.9

B-3-23

GS. EL. 1420.7

APPROXIMATE LIMITS OF

SINKHOLE OBSERVED

ON OUTBOARD SIDE

(DECEMBER 2023)

1949 SAN. M.H. - TO BE DISPOSED

OF IF ENCOUNTERED

RELIEF TRENCH - LOCATION

AND DIMENSIONS TO BE

FIELD VERIFIED

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OUTBOARD

SINK HOLE

INBOARD

SINK HOLE TEMPORARY SHED TO

BE REMOVED BY OWNER

CROSS SECTION LEGEND

EXISTING GROUND SURFACE

SAN. MAN. - NO. N0A1

RIM EL. 1418.1

SAN. M.H. - NO. GV59

RIM EL. 1429.7

CHANNEL INV. EL. 1407.19 CHANNEL INV. EL. 1407.22

10-INCH DIA. C.M.P.

INV. EL. 1408.32

15-INCH DIA. C.I.P.

CONTINUES BELOW CREEK

15-INCH DIA. C.M.P.

INV. EL. NOT KNOWN

OLEAN CREEK ON DECEMBER 22, 2023

APPROXIMATE ALIGNMENT OF DAMAGED SANITARY PIPE TO BE REPLACED

OLEAN CREEK (EL. 1412.7)

ON DECEMBER 22, 2023

GROUNDWATER MONITORING WELL SCREEN ZONE (INCLUDING SAND PACK)

N

NUMBER OF HAMMER BLOWS REQUIRED TO ADVANCE A SPLIT SPOON SAMPLER, 24 INCHES, PER ASTM D 1586

WATER LEVEL MEASURED IN GROUNDWATER MONITORING WELL ON MARCH 5, 2024

B-3-23

OFFSET 5.1' NORTH

GS EL.1420.7

<1

N

EL. 1411.2

<2

22.5' (EL. 1398.2)

23.5' (EL. 1397.2)

25.0' (EL. 1395.7)

SANDY SILT

4.5' (EL. 1416.2)

0.6' (EL. 1420.1)

SILTY CLAY

SAND, SILT,

AND CLAY WITH

GRAVEL FILL

SANDY SILT

(TOPSOIL FILL)

28.0' (EL. 1392.7)

END OF BORING

SANDY SILT

SILTY SAND

AND GRAVEL

INV. EL. 1408.44

(PIPE UNDERWATER)

EXISTING GROUND SURFACE

PREVIOUSLY

ABANDONED

15-INCH DIA. SAN.

PIPE (SEE NOTE 1)

1949 SAN. M.H. - CONDITION TO

BE FIELD VERIFIED (SEE NOTE 1)

EXISTING CONDITIONS CROSS SECTION LEGEND NOTES

1. The August 1949 Plan shows that the 1949 Sanitary Manhole was to be removed. However, the December 1951 Plan does not indicate that the 1949 Sanitary Manhole was removed. There is a possibility that the sanitary manhole still remains and is buried under the flood protection levee. The August 1949 Plan and the December 1951

Plan show that the 15-inch diameter, 835 foot long, sanitary pipe that fed into the 1949 Sanitary Manhole (extends into the page to the north) was abandoned and plugged at both ends of the pipe. The August 1949 Plan shows that two corrugated metal square seep rings, approximately 5.5 feet in length and height, were to be installed around the 15-inch diameter corrugated metal pipe, at the 1949 Sanitary Manhole and approximately 15 feet west of the 1949 Sanitary Manhole. It is not clear on the

December 1951 Plan if the seep rings were installed. Locations of these items will be field verified during construction.

2. The June 1952 Plan shows that the relief trench was constructed at the toe of the flood protection levee for a length of approximately 170 feet and was backfilled with graded sand and gravel. The relief trench was installed with an approximate width of 2 feet and extended approximately 0.5 feet into the pervious soil (i.e., sandy silt) for a total depth between 3 and 6 feet. Location and dimension to be field verified during construction.

RELIEF TRENCH -

LOCATION AND DIMENSION

TO BE FIELD VERIFIED

(SEE NOTE 2)

15-INCH DIA. C.M.P.

C.M. SQUARE SEEP RING -

LOCATIONS TO BE FIELD

VERIFIED (SEE NOTE 1)

B-1-23

OFFSET 20.2' NORTH

GS EL.1429.9

0.4' (EL. 1429.5)

13.0' (EL. 1416.9)

14.5' (EL. 1415.4)

18.0' (EL. 1411.9)

29.0' (EL. 1400.9)

32.0' (EL. 1397.9)

38.0' (EL. 1391.9)

SANDY SILT

SAND, SILT, AND

CLAY WITH

GRAVEL FILL

SILTY SAND

AND GRAVEL

SILTY CLAY

SANDY SILT

(TOPSOIL FILL)

40.0' (EL. 1389.9)

END OF BORING

CLAYEY SILT

FILL

SAND, SILT, AND

CLAY

SAND AND

GRAVEL

N

SLUICE GATE ON THE EAST WALL

OF SAN. M.H. - NO. GV59 THAT

CONTROLS FLOW INTO THE M.H.

APPROXIMATE ALIGNMENT OF SANITARY PIPE TO REMAIN

APPROXIMATE ALIGNMENT OF SANITARY CHANNEL TO REMAIN

CHANNEL

EXISTING SINKHOLE NOTES

1. The inboard and outboard sinkholes were temporarily remediated in March 2024. Procedures included excavating the previously placed sand, placing flowable fill into the void until it was filled, and placing a cover and erosion protection above the flowable fill. The flowable fill that was placed into the sinkholes appeared to remain within the void that was visible from the ground surface; there was no evidence that it flowed into and underground void network.

SCALE: 1" = 20'

0 10' 20'20'

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A.J.N. / T.W.S.

AS SHOWN

23021-003

DESIGNED BY:

JUNE 2024

DWG. NO.

SHEET:

JOB NO.

DATE:

SCALE:

23-021

CHECKED BY:

0REVISION NUMBER -

K.M.M.

K.M.M.DRAWN BY:

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SCALE: 1" = 20'

EXISTING CONDITIONS PLAN

SCALE: 1" = 10'

EXISTING CONDITIONS CROSS SECTION

3 3

SCALE: 1" = 10'

0 5' 10'10'

J u ly

A d d e d E x is ti n g S in k h o le

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AutoCAD SHX Text S

AutoCAD SHX Text S

AutoCAD SHX Text S

AutoCAD SHX Text S

AutoCAD SHX Text S

LEGEND

DAMAGED SANITARY PIPE TO BE REPLACED

LEGEND NOTE

1. Base map adapted from Google Earth imagery, acquired on March 11, 2024.

SITE ACCESS PATH

SANITARY PIPE TO REMAIN

STORMWATER PIPE TO REMAIN

SANITARY BYPASS SYSTEM< <

POTENTIAL MATERIAL STOCKPILE AREA

POTENTIAL STAGING AREA

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SAN. M.H. - NO. GV59

RIM EL. 1429.7

SAN. M.H. - NO. N0A1

SAN. M.H. - NORTH

RIM. EL. 1422.44

SAN. M.H. - SOUTH

RIM EL. 1420.6

STORM. M.H.

INV. EL. 1408.75

INV. EL. 1407.77

INV. EL. 1408.32

INV. EL. NOT KNOWN

INV. EL. 1408.13

INV. EL. 1407.22

INV. EL. 1407.19

POTENTIAL MATERIAL

STOCKPILE AREA

(SEE SITE ACCESS NOTES)

POTENTIAL STAGING AREA

(SEE SITE ACCESS NOTES)

SANITARY BYPASS SYSTEM,

ITEM NO. 024300-4.1

SANITARY BYPASS SYSTEM,

ITEM NO. 024300-4.1

INV. EL. 1408.00

1949 SAN. M.H. (NOT KNOWN

IF STRUCTURE REMAINS)

INV. EL. 1408.44

SITE ACCESS NOTES

1. The Contractor shall confine its activities to the work areas shown and shall limit its travel to and from the work site to the access path shown. The access path crosses private property that the Owner has negotiated use of. The private property owners access and needs must not be restricted by construction activities.

2. The Contractor shall be responsible for the maintenance of the site access road to the staging, work, or stockpile areas in accordance with the Contract Plans and Technical Specifications.

3. Stockpiled material shall be located within the designated staging or stockpile areas shown and as directed by the Owner. The stockpiled material shall be placed in accordance with the Technical Specifications.

4. It is the responsibility of the Contractor to grade and prepare the staging area as necessary for storing its equipment and materials.

SANITARY BYPASS SYSTEM CONSTRUCTION SEQUENCE NOTES

1. Prior to the commencement of earthwork, the Contractor shall install all pumps and pipes necessary to maintain the sanitary flow to Sanitary Manhole - No. GV59, Item No. 024300-4.1. This shall include pumping directly from Sanitary Manhole - North and Sanitary Manhole - South to Sanitary Manhole - No. GV59, bypassing Sanitary Manhole - No. N0A1.

2. Sanitary pipes exiting the Sanitary Manhole - North and Sanitary Manhole - South which flow to Sanitary Manhole - No. N0A1 shall be temporarily plugged to prevent downstream flow.

3. The sluice gate located on the inlet to Sanitary Manhole - No. GV59 shall be closed. This gate shall remain closed while the bypass pipes are discharging into the manhole.

4. Earthwork shall commence after the pumps and pipes have been installed, critical gates have been closed, critical pipes have been plugged, and sanitary flow has been directed away from Sanitary Manhole - No. N0A1.

5. The sanitary bypass will be operated as needed during the duration of construction until the new sanitary piping is installed and inspected to the satisfaction of the Engineer and Owner.

6. Remove all temporary piping, pumps, plugs, and restore Sanitary Manhole - North and Sanitary Manhole - South to original condition upon completion of construction work.

SCALE: 1" = 100'

0 50' 100'100'

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1" = 100'

23021-005

DESIGNED BY:

JUNE 2024

DWG. NO.

SHEET:

JOB NO.

DATE:

SCALE:

23-021

CHECKED BY:

0REVISION NUMBER -

K.M.M.

K.M.M.DRAWN BY:

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SCALE: 1" = 100'

SITE ACCESS PLAN

(SEE NOTE 1)

APPROXIMATE EDGE OF

OLEAN CREEK

(DECEMBER 22, 2023)

EXISTING BRUSH LINE

NOTE

1. Base map adapted from survey completed by

KHEOPS Architecture, Engineering & Survey, DPC, dated December 2023.

EXISTING SANITARY MANHOLE

TOP OF STREAMBANK

BOTTOM OF STREAMBANK

EXISTING HANDRAIL

STONE LINED ACCESS ROAD

EXISTING CONCRETE LIMITS

EXISTING STORMWATER PIPE

TO REMAIN

EXISTING SANITARY PIPE TO

REMAIN

SLOPED EXCAVATION GRADES

1949 SANITARY MANHOLE

ABANDONED 15-INCH

DIAMETER SANITARY PIPE

RELIEF TRENCH LIMITS

DAMAGED SANITARY PIPE

TO BE REPLACED

LIMITS OF TRENCH

EXCAVATION

O L E

A N

C R

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K

5 5

5 5

5 5

SAN. M.H. - SOUTH

10-INCH DIA. C.M.P.

15-INCH DIA. C.M.P.

STORM. M.H.

SAN. M.H. - NO. GV59

(TO REMAIN AND BE PROTECTED)

TRENCH EXCAVATION AND DISPOSAL,

ITEM NO. 312323-4.3,

- SEE SECTIONS

5 5

2.5H:1V

.5

H :1

V

10H:1V

SAN. M.H. - NO. N0A1 (TO REMAIN AND BE PROTECTED)

REMOVAL AND

DISPOSAL OF 1949

SANITARY MANHOLE,

ITEM NO. 333000-4.2

LOCATE RELIEF TRENCH

DURING SLOPED EXCAVATION

5 5

50H:1V

ABANDONED 15-INCH

DIA. SAN. PIPE TO BE

EVALUATED ONCE

EXPOSED

LIMITS OF TOPSOIL REMOVAL,

ITEM NO. 311100-4.1

REMOVAL AND DISPOSAL OF EXISTING

SANITARY PIPE, ITEM NO. 333000-4.1

5 5

PIPE PROTECTION,

ITEM NO. 330100-4.1

PIPE PROTECTION,

ITEM NO. 330100-4.1

PIPE PROTECTION,

ITEM NO. 330100-4.1

18-INCH DIA.

STORM. PIPE

15-INCH DIA. C.I.P.

(TO REMAIN AND

BE PROTECTED)

CHANNEL INVERT

EL. 1407.19

CHANNEL INVERT

EL. 1407.22

INV. EL. 1408.44

INV. EL. 1408.32

INV. EL. NOT KNOWN

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0.5' (MIN.)

SAN. M.H. - NO. N0A1

RIM EL. 1418.1

SAN. M.H. - NO. GV59

RIM EL. 1429.7

CHANNEL INV. EL. 1407.22

10-INCH DIA.

C.M.P. TO REMAIN

15-INCH DIA. C.I.P.

TO REMAIN

15-INCH DIA.

C.M.P. TO REMAIN

OLEAN CREEK (EL. 1412.7)

ON DECEMBER 22, 2023

INV. EL. 1408.44

APPROXIMATE

EXCAVATION EL. 1406.76

TO BE FIELD VERIFIED

APPROXIMATE

EXCAVATION EL. 1407.93

TO BE FIELD VERIFIED

EXCAVATION EL. 1410.00 EXCAVATION EL. 1411.00

EXISTING GROUND SURFACE

LIMIT OF TRENCH EXCAVATION AND DISPOSAL,

ITEM NO. 312323-4.3

REMOVAL AND

DISPOSAL OF 1949

SANITARY MANHOLE,

ITEM NO. 333000-4.2

LOCATE RELIEF TRENCH DURING

SLOPED EXCAVATION

C.M. SQUARE SEEP RINGS TO BE

DISPOSED OF IF ENCOUNTERED

SLOPED EXCAVATION,

ITEM NO. 312323-4.1

REMOVAL AND DISPOSAL

OF EXISTING SANITARY

PIPE, ITEM NO. 333000-4.1

SAN. M.H. - NO. GV59

SLUICE GATE TO REMAIN

ABANDONED 15-INCH DIA.

SAN. PIPE TO BE EVALUATED

ONCE EXPOSED

0.5' (MIN.)

PIPE REMOVAL FROM

MANHOLE - SEE DETAIL 3

5 7

CHANNEL INV. EL. 1407.19

PIPE REMOVAL FROM

MANHOLE - SEE DETAIL 3

5 7

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EXISTING GROUND SURFACE

SLOPED EXCAVATION,

ITEM NO. 312323-4.1

EL. VARIES

EL. VARIESTRENCH EXCAVATION AND DISPOSAL,

ITEM NO. 312323-4.3

REMOVAL AND DISPOSAL OF

EXISTING SANITARY PIPE,

ITEM NO. 333000-4.1

2.5

2.5

EXCAVATION CONSTRUCTION SEQUENCE NOTES

1. Prior to the start of construction, pipe protection shall be installed over the 18-inch diameter stormwater pipe within the limits shown, Item No. 330100-4.1. The pipe protection shall be sized for the expected soil cover and construction loads so as to limit additional stresses and deflections of the pipe and be approved by the Engineer and Owner.

2. Next, the Contractor shall establish all horizontal and vertical control points necessary to accurately complete the work and establish data to create record plans, Item No. 022100-4.1. The top and bottom elevations of each material type and excavation grade shall be measured with sufficient accuracy to establish quantities for payment.

3. After, the Contractor shall install sedimentation and erosion control measures upgradient of the planned excavation, Item

No. 312500-4.1. The Contractor shall also survey the approximate limits of the relief trench to help verify during excavation, Item No. 022100-4.1.

4. Once the erosion and sedimentation control measures are in place, the Contractor shall begin earthwork operations by removing topsoil within the limits shown, Item No. 311100-4.1. Topsoil shall be stockpiled onsite in the designated areas shown on Sheet 4 of the Contract Plans. Sedimentation and erosion control measures shall be installed downgradient of the stockpiled material, Item No. 312500-4.1.

5. Following topsoil removal, the Contractor shall excavate to the sloped excavation grades shown, Item No. 312323-4.1.

During the sloped excavation, the Contractor shall install pipe protection over the alignment of the two sanitary pipes

(15-inch diameter pipe and 10-inch diameter pipe) located within the sloped excavation to the limits shown, Item No.

330100-4.1.The pipe protection shall be sized for the expected soil cover and construction loads so as to limit additional stresses and deflections of the pipe and be approved by the Engineer and Owner. The 15-inch diameter sanitary pipe that discharges from Sanitary Manhole - North to Sanitary Manhole - No. N0A1 will be located at the toe of the access ramp into the sloped excavation and will need to account for larger loads from construction equipment and vehicles.

6. As the sloped excavation progresses, the Contractor shall implement excavation dewatering techniques as needed, Item

No. 312319-4.1.

7. Soil excavated from the sloped excavation shall be stockpiled onsite in the designated areas shown on Sheet 4 of the

Contract Plans, Item No. 312323-4.1. Sedimentation and erosion control measures shall be installed downgradient of the stockpiled material, Item No. 312500-4.1.

8. The Contractor shall collect a minimum of three representative soil samples from the stockpiled sloped excavation material and test them in accordance with the Technical Specifications, Item No. 312323-4.2.

9. If the relief trench is encountered during the sloped excavation, the Contractor shall collect a minimum of three representative soil samples from the relief trench material. The soil samples shall be tested in accordance with the

Technical Specifications, Item No. 312323-4.2.

10. Following sloped excavation, the Contractor shall excavate to the trench excavation grades shown, Item No. 312323-4.3.

12. As the trench excavation progresses, the Contractor shall implement excavation dewatering techniques as needed, Item

No. 312319-4.1.

13. Soil excavated from the trench excavation should be classified as contaminated soil and disposed of in accordance with

Section 31 20 00 - Removal and Disposal of Contaminated Materials of the Technical Specifications, Item No. 312323-4.3.

14. During trench excavation, if the 1949 Sanitary Manhole is encountered, the manhole should be classified as contaminated material and disposed of in accordance with Section 31 20 00 - Removal and Disposal of Contaminated Materials of the

Technical Specifications, Item No. 333000-4.2.

15. The existing sanitary pipe will be exposed during trench excavation. The pipe should be classified as contaminated material and disposed of in accordance with Section 31 20 00 - Removal and Disposal of Contaminated Materials of the

Technical Specifications, Item No. 333000-4.1.

16. The existing sanitary pipe is installed into each manhole as shown in the details on Sheet 7 of the Contract Plans. Actual conditions may vary once the pipe is exposed, changes to removal or additional work required shall be discussed with the

Engineer and Owner.

17.The abandoned 15-inch diameter sanitary pipe that connects into the 1949 Sanitary Manhole shall be evaluated by the

Owner and Engineer after trench excavation is complete and the pipe has been exposed. Depending on the condition of the pipe, additional remediation/removal measures may be required.

18. The Owner and Engineer contact information is as follows:

Todd Swackhamer, P.E., Design Engineer - (716) 834-8932

Brad Camp, Olean DPW Water & Sewer Superintendent - (716) 376-5659

SCALE: 1" = 20'

0 10' 20'20'

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AS SHOWN

23021-004

DESIGNED BY:

JUNE 2024

DWG. NO.

SHEET:

JOB NO.

DATE:

SCALE:

23-021

CHECKED BY:

0REVISION NUMBER -

K.M.M.

K.M.M.DRAWN BY:

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C o n s u lt in g E n g in e e ri n g a n d G e o lo g y P

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M a in S tr e e t, S u it e

B u ff a lo N

Y

(7

-8 w w w

.m m c e

.n e t

SCALE: 1" = 20'

EXCAVATION PLAN

SCALE: 1" = 10'

EXCAVATION CROSS SECTION

5 5

SCALE: 1" = 10'

0 5' 10'10'

SCALE: 1" = 10'

EXCAVATION PROFILE

5 5

SCALE: 1" = 10'

0 5' 10'10'

J u ly

A d d e d s id e s lo p e a n g le a n d N o te

AutoCAD SHX Text S

AutoCAD SHX Text S

AutoCAD SHX Text S

AutoCAD SHX Text S

(SEE NOTE 1)

APPROXIMATE EDGE OF OLEAN

CREEK (DECEMBER 22, 2023)

1949 ABANDONED UNDERGROUND

SANITARY UTILITY

NOTE:

1. Base map adapted from survey completed by KHEOPS

Architecture, Engineering & Survey, DPC, dated December

2023.

SANITARY MANHOLE

TOP OF STREAMBANK

BOTTOM OF STREAMBANK

EXISTING HANDRAIL

STONE LINED ACCESS ROAD

EXISTING CONCRETE LIMITS

UNDERGROUND

STORMWATER UTILITY

EXISTING UNDERGROUND

SANITARY UTILITY

CONCEPTUAL FINAL GRADE

CONTOURS

PROPOSED UNDERGROUND

SANITARY UTILITY

EXISTING BRUSH LINE

EXISTING RELIEF TRENCH LIMITS

RELIEF TRENCH CONNECTION

LIMITS

O L E

A N

C R

E E

K

6 6

6 6

6 6

SANITARY M.H. - SOUTH

10-INCH DIA. C.M.P.

15-INCH DIA. C.M.P.

15-INCH DIA. C.I.P.

STORM. M.H.

18-INCH DIA.

STORM. PIPE

GRADE TO MATCH

EXISTING CONTOURS

INSTALLATION OF NEW SANITARY PIPE,

ITEM NO. 333000-4.3

(15-INCH DIA. SDR 35 PVC PIPE)

ABANDONED 15-INCH

DIA. SAN. PIPE

RELIEF TRENCH CONNECTION,

ITEM NO. 312323-4.8,

- SEE DETAIL

6 6

RELIEF TRENCH

GRADE TO MATCH

EXISTING CONTOURS

LIMITS OF TOPSOIL PLACEMENT,

ITEM NO. 312219-4.1 (ONSITE)

AND ITEM NO. 312219-4.2

(OFFSITE), AND REVEGETATION,

ITEM NO. 312219-4.3

SAN. M.H. - NO N0A1

SAN. M.H. - NO. GV59

6 7

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1435SAN. M.H. - NO. GV59

RIM EL. 1429.7

CHANNEL INV. EL. 1407.22

10-INCH DIA. C.M.P.

15-INCH DIA. C.I.P.

15-INCH DIA. C.M.P.

INSTALLATION OF

NEW SANITARY PIPE,

ITEM NO. 333000-4.3

(15-INCH DIA. SDR 35

PVC PIPE)

OLEAN CREEK (EL. 1412.7)

ON DECEMBER 22, 2023

INV. EL. 1408.44

FINAL GRADE EXISTING GROUND SURFACE

RELIEF TRENCH CONNECTION,

ITEM NO. 312323-4.8,

- SEE DETAIL

SAN. M.H. - NO. N0A1

RIM EL. 1418.1

KEYED SLOPE

CONNECTION

- SEE DETAIL

6-INCH TOPSOIL,

TOPSOIL - ONSITE, ITEM NO. 312219-4.1

TOPSOIL - OFFSITE, ITEM NO. 312219-4.2

REVEGETATION, ITEM NO. 312219-4.3

CONSISTS OF FERTILIZER, GRASS

SEED, MULCH, AND BINDER

KEYED SLOPE

CONNECTION

- SEE DETAIL

6 7

6 7

PIPE REPLACEMENT INTO

MANHOLE - SEE DETAIL 4

6 7

PIPE REPLACEMENT INTO

MANHOLE - SEE DETAIL

6 7

CHANNEL INV. EL. 1407.19

ABANDONED 15-INCH

DIA. SAN. PIPE

FLOWABLE FILL,

ITEM NO. 312323-4.4

SAN. M.H. - NO.

GV59 SLUICE GATE

6 7

0.5' (MIN.)

20.0'

SUITABLE FILL - ONSITE, ITEM NO. 312323-4.5

SUITABLE FILL - OFFSITE, ITEM NO. 312323-4.6

FILTER COLLAR

- SEE DETAIL

6 7

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2.5' (MIN.)

EXISTING GROUND SURFACE

TRENCH EXCAVATION LIMIT

FINAL GRADE

SUITABLE FILL - ONSITE,

ITEM NO. 312323-4.5 /

SUITABLE FILL - OFFSITE,

ITEM NO. 312323-4.6

REVEGETATION, ITEM NO. 312219-4.3

CONSISTS OF FERTILIZER, GRASS

SEED, MULCH, AND BINDER

6-INCH TOPSOIL,

TOPSOIL - ONSITE, ITEM NO. 312219-4.1

TOPSOIL - OFFSITE, ITEM NO. 312219-4.2

INSTALLATION OF

NEW SANITARY PIPE,

ITEM NO. 333000-4.3

(15-INCH DIA. SDR 35

PVC PIPE)

FLOWABLE FILL,

ITEM NO. 312323-4.4

KEYED SLOPE

CONNECTION

- SEE DETAIL

KEYED SLOPE

CONNECTION

- SEE DETAIL

2.5

2.5

EXISTING

(FILL/SANDY SILT/SAND

AND GRAVEL)

EXISTING

(FILL/SANDY SILT/SAND

AND GRAVEL)

6 7

6 7

0.5' (MIN.)

FINAL GRADING CONSTRUCTION SEQUENCE NOTES

1. Upon completion of the trench excavation and subsequent material disposal, the Contractor shall prepare the subgrade within the excavation prior to placement of flowable fill in accordance with Section 31 23 23 -

Earthwork of the Technical Specifications.

2. After subgrade acceptance, the Contractor shall install the new sanitary pipe (15-inch diameter SDR 35 PVC pipe), Item No. 333000-4.3, in accordance with Section 33 30 00 - Sanitary Utility Piping and Structures of the

Technical Specifications and the sections and details shown on Sheets 6 and 7 of the Contract Plans. The proposed pipe invert elevations for the new sanitary pipe shown, shall be field verified after exposing and removing existing pipe.

3. Install the new sanitary pipe as shown in the details on Sheet 7 so as to create a water tight connection. The pipe connection and seal to Sanitary Manhole - No. GV59 shall in no way damage operation of the existing sluice gate.

4. Following the installation of the new sanitary pipe, the Contractor shall start placement of the flowable fill within the trench excavation around the new sanitary pipe to the grades shown, Item No. 312323-4.4, in accordance with Section 31 23 23 - Earthwork of the Technical Specifications. Flowable fill shall be placed in lifts and sections to maintain the proposed alignment of the new sanitary pipe.

5. Upon completion of placement of the flowable fill, the Contractor shall prepare the subgrade within the sloped excavation limits prior to placement of the suitable fill in accordance with Section 31 23 23 - Earthwork of the

Technical Specifications.

6. After acceptance of the subgrade, the Contractor shall start placement and compaction of the suitable fill

(from onsite stockpile, Item No. 312323-4.5 and as needed from offsite source, Item No. 312323-4.6) within the sloped excavation to the grades shown in accordance with Section 31 23 23 - Earthwork of the Technical

Specifications. The compacted suitable fill shall be keyed into the excavation slopes as shown on Sheets 6 and 7 of the Contract Plans.

7. The Contractor shall obtain the services of a third party testing firm to complete the in-place field density tests, Item No. 312323-4.7. The Field Technician shall measure the in-place dry density and in-place moisture content at the minimum requirements provided in Section 31 23 23 - Earthwork of the Technical

Specifications.

8. If the limits of the relief trench are encountered during sloped excavation, the relief trench should be restored, Item No. 312323-4.8. The relief trench should be restored to the approximate limits and dimensions surveyed during the sloped excavation, as follows:

a. Following placement of the suitable fill, excavate to approximate limits surveyed during the sloped excavation.

b. The Contractor shall prepare the subgrade within the relief trench excavation prior to placement of concrete sand as specified in the Section 31 23 23 - Earthwork of the Technical Specifications.

c. Then the Contractor shall place the concrete sand in accordance with Section 31 23 23 - Earthwork of the

Technical Specifications.

9. Following placement of the suitable fill and relief trench connection, topsoil shall be placed to a minimum compacted depth of 6 inches within the limits indicated. Topsoil from either onsite stockpile, Item No.

312219-4.1, or if needed offsite source, Item No. 312219-4.2, shall be placed. The topsoil shall be placed in accordance with Section 31 22 19 - Revegetation of the Technical Specifications.

10. After placement of topsoil, the Contractor shall perform revegetation, Item No. 312219-4.3. This shall include soil preparation and fertilizing, seeding and mulching, and maintenance. Revegetation shall be performed in accordance with the guidelines and requirements provided in Section 31 22 19 - Revegetation of the

Technical Specifications. The Contractor shall be responsible for satisfactory establishment and growth of a permanent stand of vegetation for a period of one year following the final seeding as judged by the Owner.

During this period, the Contractor shall be responsible for the maintenance of vegetation.

11. After the completion of construction and before sanitary flow is directed to Sanitary Manhole - No. N0A1, the

Contractor shall inspect the new pipe, Item No. 330130-4.1. The pipe inspection shall be in accordance with

Section 33 01 30 - Pipe Verification of the Technical Specifications. Following approval of the pipe inspection, the Contractor shall remove the sanitary bypass system and direct the sanitary flow into Sanitary Manhole -

No. N0A1 where the flow can then travel to Sanitary Manhole - No. GV59.

12. Upon completion of the work, all equipment and materials shall be removed from the staging area, shown on

Sheet 4 of the Contract Plans, and the area shall be returned to preconstruction condition to the satisfaction of the Owner. All incidental areas disturbed by the Contractor are to be returned to their original condition or better by the Contractor upon completion of the project.

13. All excess material and debris shall be removed from the site as specified in the Technical Specifications.

SCALE: 1" = 20'

0 10' 20'20'

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A.J.N. / T.W.S.

AS SHOWN

23021-006a

DESIGNED BY:

JUNE 2024

DWG. NO.

SHEET:

JOB NO.

DATE:

SCALE:

23-021

CHECKED BY:

0REVISION NUMBER -

K.M.M.

K.M.M.DRAWN BY:

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SCALE: 1" = 20'

FINAL GRADING PLAN

SCALE: 1" = 10'

FINAL GRADING CROSS SECTION

6 6

SCALE: 1" = 10'

0 5' 10'10'

SCALE: 1" = 10'

FINAL GRADING PROFILE

6 6

SCALE: 1" = 10'

0 5' 10'10'

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A d d e d F ilt e r C o lla r

AutoCAD SHX Text S

AutoCAD SHX Text S

~2'

DEPTH OF

RELIEF

TRENCH

VARIES

(~3-6')

RELIEF TRENCH CONNECTION NOTES

1. The historical construction drawings show that the relief trench was installed with an approximate width of 2 feet and extended approximately

0.5 feet into the pervious soil (i.e., sandy silt) for a total depth between 3 and 6 feet.

2. If the limits of the relief trench are encountered during sloped excavation, the relief trench should be restored, Item No. 312323-4.8. The relief trench should be restored to the approximate limits and dimensions surveyed during the sloped excavation, as follows:

a. Following placement of the suitable fill, excavate to approximate limits surveyed during the sloped excavation.

b. The Contractor shall prepare the subgrade within the relief trench excavation prior to placement of concrete sand as specified in the

Section 31 23 23 - Earthwork of the Technical Specifications.

c. Then the Contractor shall place the concrete sand in accordance with Section 31 23 23 - Earthwork of the Technical Specifications.

REVEGETATION, ITEM NO. 312219-4.3

CONSISTS OF FERTILIZER, GRASS

SEED, MULCH, AND BINDER

6-INCH TOPSOIL,

TOPSOIL - ONSITE, ITEM NO. 312219-4.1

TOPSOIL - OFFSITE, ITEM NO. 312219-4.2

RELIEF TRENCH CONNECTION,

ITEM NO. 312323-4.8,

RELIEF TRENCH EXCAVATION

AND CONCRETE SAND

PLACEMENT

SUITABLE FILL - ONSITE,

ITEM NO. 312323-4.5 /

SUITABLE FILL - OFFSITE,

ITEM NO. 312323-4.6

EXISTING

(FILL/SANDY SILT/SAND

AND GRAVEL)

20"

8"

12"

6"

6"

12"

18"

4"

3"

MAX.

EXISTING CONCRETE STRUCTURE

(SAN. M.H. - NO. GV59)

SAN. M.H. - NO. GV59

REMOVE EXISTING CONCRETE

AROUND AND BEYOND EXISTING

PIPE TO ALLOW FOR NEW PIPE

CONNECTION

SLUICE GATE OPERATOR

DO NOT EXCEED 3" OF

CONCRETE REMOVAL IN ANY

DIRECTION WITHOUT APPROVAL

FROM THE ENGINEER OR OWNER

SLUICE GATE FLUSH TO CONCRETE -

SEE PHOTO DETAIL BELOW

TRENCH EXCAVATION AND DISPOSAL LIMIT,

ITEM NO. 312323-4.3

REMOVAL AND DISPOSAL OF EXISTING

SANITARY PIPE, ITEM NO. 333000-4.1

84 FEET OF

EXISTING PIPE

(NOT SHOWN)

3"

MAX.

3"

MAX.

DO NOT EXCEED 3" OF

CONCRETE REMOVAL IN ANY

DIRECTION WITHOUT APPROVAL

FROM THE ENGINEER OR OWNER

EXISTING BRICK/CONCRETE STRUCTURE

(SAN. M.H. - NO. N0A1) -

SEE PHOTO DETAIL BELOW

SAN. M.H. - NO. N0A1

REMOVE EXISTING

BRICK/CONCRETE AROUND AND

BEYOND EXISTING PIPE TO

ALLOW FOR NEW PIPE

CONNECTION

EXISTING CONCRETE STRUCTURE

(SAN. M.H. - NO. GV59)

SAN. M.H. - NO. GV59

SLUICE GATE OPERATOR

SLUICE GATE FLUSH

TO CONCRETE

INSTALLATION OF NEW SANITARY PIPE,

ITEM NO. 333000-4.3

CONSISTS OF NEW SANITARY PIPE

(15-INCH DIA. SDR 35 PVC PIPE),

WATER STOP GROUTING RING, AND

HYDRAULIC CEMENT GROUT

84 FEET OF

NEW PIPE

(NOT SHOWN)

EXISTING BRICK/CONCRETE

STRUCTURE

(SAN. M.H. - NO. N0A1)

SAN. M.H. - NO. N0A1

TRENCH EXCAVATION AND DISPOSAL LIMIT,

ITEM NO. 312323-4.3

WATER STOP GROUTING RING

SIZED TO FIT TIGHTLY TO PIPE

AND BE EMBEDDED INTO GROUT

FILL VOID AREAS WITH

HYDRAULIC CEMENT GROUT

WATER STOP GROUTING RING

SIZED TO FIT TIGHTLY TO PIPE

AND BE EMBEDDED INTO GROUT

FILL VOID AREAS WITH

HYDRAULIC CEMENT GROUT

EXTEND NEW PIPE TO

CONCRETE REMOVAL DEPTH

FLOWABLE FILL

NEW PIPE

SUITABLE FILL

EXISTING NATIVE

FOUNDATION SOIL

FILTER COLLAR

3.0'

3.0'

1.5'

1.5'

NEW PIPE

FILTER COLLAR - CONCRETE

SAND ITEM NO. 312323-4.8

SUITABLE FILL

EXISTING NATIVE

FOUNDATION SOIL

SLOPE FOR SAFETY

& STABILITY

5.5'

SCALE: 1" = 2'

RELIEF TRENCH CONNECTION DETAIL

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A.J.N. / T.W.S.

AS SHOWN

23021-006b

DESIGNED BY:

JUNE 2024

DWG. NO.

SHEET:

JOB NO.

DATE:

SCALE:

23-021

CHECKED BY:

0REVISION NUMBER -

K.M.M.

K.M.M.DRAWN BY:

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SCALE: 1" = 1'

KEYED SLOPE CONNECTION DETAIL

6 7

SCALE: 1" = 2'

PIPE REMOVAL FROM MANHOLE DETAIL

5 7

SCALE: 1" = 2'

PIPE REPLACEMENT INTO MANHOLE DETAIL

6 7

SCALE: 1" = 2'

FILTER COLLAR DETAIL

6 7

SCALE: 1" = 2'

FILTER COLLAR SECTION

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A d d e d F ilt e r

C o lla r

D e ta il a n d S e c ti o n

Project Specifications

Prepared by

McMahon & Mann Consulting Engineering and Geology, P.C.

SECTION 02 21 00 SURVEYING AND RECORD PLANS

Olean Flood Protection Levee Page 02 21 00 - 1

SECTION 02 21 00

SURVEYING AND RECORD PLANS

PART 1 – GENERAL

1.1. SCOPE

A. This work shall consist of all necessary surveying required to construct all elements of the project as shown on the Contract Plans or as directed by the Engineer in accordance with the specifications.

B. Work shall include but not be limited to stakeout, layout, and elevations for the limit of disturbance, new sanitary piping, and remaining sanitary utility structures by qualified personnel acceptable to the Engineer and Owner and the installation of a temporary staff gage.

1.2. RELATED SECTIONS

A. Earthwork – Section 31 23 23

B. Sanitary Utility Piping and Structures – Section 33 30 00

1.3. REFERENCE STANDARDS

A. New York State Department of Transportation (NYSDOT) Standard Specifications Section 625 – Survey Operations.

1.4. SUBMITTALS

A. Submittals shall be prepared and reviewed at least two weeks prior to the start of construction.

B. Submit qualifications for the surveying firm and the qualified personnel indicating a minimum of three years of experience with construction layout and record plan development.

C. Submit plan for construction survey control including survey equipment and location of baselines for control of work. Equipment shall conform to the latest NYSDOT Standard Specifications Section 625-2.

D. Submit plan for installation of temporary staff gage including equipment and location of gage.

PART 2 – MATERIALS

None

Olean Flood Protection Levee Page 02 21 00 - 2

PART 3 – EXECUTION

3.1. TEMPORARY STAFF GAGE

A. Prior to the commencement of earthwork, the Contractor shall install a temporary staff gage along the bank of Olean Creek to monitor the water level in the creek. The gage should be placed so that it is visible without obstructions throughout the construction schedule and so that it remains visible at increase water levels. The gage should have graduated marks at each tenth of a foot of height and it should have additional distinctive marks at each whole foot. The “action” stage level determined for the construction site will be measured with respect to this temporary staff gage and will be provided to the Contractor prior to the start of construction. The Contractor shall observe the stage level of the creek at the beginning and end of every day and shall report its observations to the Engineer and Owner.

3.2. GENERAL

A. Work shall conform to the latest NYSDOT Standard Specifications Section 625-3.

B. Survey measurements are required to be accurate to within 0.12 inches (0.01 feet) in horizontal location and within 0.12 inches (0.01 feet) in elevation.

C. Prior to commencement of earthwork, the Contractor shall establish all necessary baselines, and horizontal and vertical control points, necessary to accurately complete the construction.

D. Existing grades shall be verified within the construction limits shown on the Contract

Plans, with information provided to the Engineer for review and issuance of proposed grades.

E. Approximate limits of the relief trench, as shown on the Contract Plans, shall be surveyed prior to sloped excavation to help verify during excavation if the relief trench is present. If the relief trench is encountered during sloped excavation, the Contractor shall survey the actual limits of the relief trench and reconstruct the relief trench in the existing location and to the existing dimensions.

F. As-built points, sufficient to define surfaces for measurements and payment, shall be taken at all surfaces, including: the ground surface following the completion of…