5140-097P1821.pdf

STRUCTURE SUMMARY STRUCTURE NO. 5140-097P

PRICE LAKE DAM BRIDGE INSPECTION DATE: 6/26/19

BRIDGE IDENTIFICATION AND DESCRIPTION

MAIN SPAN MATERIAL: ....... CONCRETE CONTINUOUS

MAIN SPAN TYPE: ............... SLAB

# OF BEAMS, MAIN SPAN: .. 1

DECK TYPE: ......................... CONCRETE CAST-IN-PLACE

WEARING SURFACE: .......... BITUMINOUS

ABUT. FOUNDATIONS: ........ OTHER

PIER FOUNDATION(S): ........ OTHER

ABUTMENT / PIER MAT'L: ... MASONRY / CONCRETE

PROJ./PLAN REF. NO: ......... 2G5 / 3020

NPS ROAD CLASS: .............. 1 - PRINCIPAL PARK ROAD

STRUCTURE HISTORY: ...... 1990-WEARING SURFACE PLACED.

NO. OF MAIN SPANS:

NO. OF APPR. SPANS:

STRUCT. TOTAL LENGTH: ..

MAX. SPAN LENGTH:

DECK WIDTH:

CURB TO CURB WIDTH:

YEAR BUILT:

YEAR RECONSTRUCTED: ..

SKEW ANGLE:

FRACTURE CRITICAL:

110.0 FT (33.5 M)

40.0 FT (12.2 M)

36.3 FT (11.1 M)

26.0 FT (7.9 M)

N/A

0 °

NO

LOCATION

BLUE RIDGE PARKWAY MILE POINT: ..................... 296.64 (KM PT 477.38)

STATE: ................................. NORTH CAROLINA LOCATION: 9.4 MILES FROM U. S. ROUTE 221.

FACILITY CARRIED: ............ BLUE RIDGE PARKWAY

FEATURE INTERSECTED: .. PRICE LAKE DAM

STRUCTURE EVALUATION SUMMARY

This concrete slab bridge is in good structural condition. The most serious problem at this time is damage to the aluminum handrail posts. Southeast handrail has been repaired previously but still moves back and forth. Another problem is the moderate transverse cracking of the approach pavement over both joints at the ends of the bridge.

Vegetation has begun to grow in the cracks which could promote further damage to the pavement.

It should also be noted that the severity of the cracking, spalling, and scaling of the concrete spillway has increased since the previous inspections, and may require corrective action in the future.

Corrective measures should be taken as outlined in this report to help prevent the possible development of more serious or costly problems in the future.

INSPECTION TEAM: R. SILVESTRY, E. JOHNSON

CONDITION ASSESSMENT:

REINALDO SILVESTRY, P.E., FIELD TEAM LEADER 703-404-6251

REPORT REVIEW:

MARCUS MILLER, P.E., BRIDGE INSPECTION ENGINEER 703-404-6252

REPORT APPROVAL: DATE: 12/10/19

JORGOMAI CEESAY, PH.D., P.E., BIP SUPERVISORY ENGINEER 703-404-6244

RECOMMENDATIONS AND ESTIMATED COSTS STRUCTURE NO. 5140-097P

A (Critical) - Structure is closed, in imminent danger of collapse, or presents a critical safety hazard.

B (Major) - Structure exhibits severe deterioration, presents a safety hazard, or is designated a high priority due to age and/or condition.

C (Moderate) - Structure is deficient, functionally obsolete, or requires substantial repairs to prevent a serious deficiency or unsafe condition.

D (Minor) - Structure is generally in good condition. Preventative maintenance may be required.

E (Special) - Structure is under construction or reconstruction.

D226 PRIORITY OF IMPROVEMENT

ITEM

NO.

ROUTINE MAINTENANCE QTY. UNIT UNIT

COST

PRELIM.

COST

ESTIMATE

PRELIM. MAINTENANCE TOTAL :

ITEM

NO.

REHABILITATION/RECONSTRUCTION

(TYPICALLY NEEDED WITHIN 5 YEARS)

QTY. UNIT

UNIT

COST

PRELIM. COST

ESTIMATES

REHAB. RECONSTR.

222.4 SAW CUT AND SEAL APPROACH PAVEMENT OVER JOINTS.

58.6 REPAIR SPLITS IN RAIL POSTS.

CONTRACT COSTS FOR MOBILIZATION, TRAFFIC CONTROL,

DESIGN, AND CONSTRUCTION ENGINEERING (APPROXIMATELY

70% OF TOTAL REHAB COST) PLUS PARK LOCATION FACTOR.

PRELIM. REHABILITATION/RECONSTRUCTION TOTAL :

PRELIMINARY ESTIMATE TOTAL* :

(*Includes typical contract costs for mobilization, traffic control, and design/construction engineering; but does not include detour bridges, work beyond the bridge limits, or work not listed above. Estimates are approximate and are for preliminary planning purposes only; they should not be used as a complete or final engineers estimate.)

REMARKS: Cost estimates assume that the recommended actions will be combined with similar work being performed on other structures.

FIELD INSPECTION REPORT STRUCTURE NO. 5140-097P

CONDITION RATING CODES FOR ITEMS 58 - 62, 222, 223

N NOT APPLICABLE 3 SERIOUS CONDITION - loss of section, deterioration, spalling, or scour have seriously affected primary structural components. Local failures are possible.

9 EXCELLENT CONDITION Fatigue cracks in steel or shear cracks in concrete may be present.

8 VERY GOOD CONDITION - no problems noted. 2 CRITICAL CONDITION - advanced deterioration of primary structural elements. Fatigue cracks in steel or shear cracks in concrete may be present

7 GOOD CONDITION - some minor problems. or scour may have removed substructure support. Unless closely monitored it may be necessary to close the structure until corrective action can be taken.

6 SATISFACTORY CONDITION - structural elements show some minor deterioration. 1 “IMMINENT” FAILURE CONDITION - major deterioration or sec ion loss present in critical structural components or obvious vertical or horizontal 5 FAIR CONDITION - all primary structural elements are sound but may have movement affecting structure stability. Structure is closed to traffic but minor section loss, cracking, spalling, or scour. corrective action may return structure to light service.

4 POOR CONDITION - advanced section loss, deterioration, spalling, or scour. 0 FAILED CONDITION - out of service; beyond corrective action.

CONDITION RATING CODE EQUIVALENTS FOR SUB-ELEMENTS

G = GOOD (CODES 7 - 9) F = FAIR (CODES 5 - 6) P = POOR (CODES 0 - 4)

58. DECK 7 ITEM REFERENCE AND REMARKS

G1. DECK SLAB

N2. EXPANSION JOINTS

G3. WEARING SURFACE

G4. RIDEABILITY

G5. CURBS, SIDEWALKS, AND MEDIAN

F6. PARAPETS AND/OR RAILINGS

G7. DRAINS AND DRAINAGE

G8. UTILITIES

G9. DEFLECTION AND/OR VIBRATION

N10. OTHER

59. SUPERSTRUCTURE 7

N1. BEARING DEVICES

N2. GIRDERS OR BEAMS

G3. ARCH(ES) OR SLAB(S)

N4. FLOOR BEAMS AND STRINGERS

N5. TRUSSES

N6. DIAPHRAGMS AND BRACING

N7. PAINT

N8. FASCIA(E)

G9. DEFLECTION AND/OR VIBRATION

G10. ALIGNMENT

N11. OTHER

60. SUBSTRUCTURE 6

58.1, 59.3 MINOR LONGITUDINAL CRACKING WITH EFFLORESCENCE ON

UNDERSIDE OF DECK ALONG CONSTRUCTION JOINT. (UNDERSIDE

NOT ACCESSED OR SEEN THIS INSPECTION) MINOR VERTICAL

CRACKING WITH EFFLORESCENCE ON WEST FACE OF DECK SLAB.

MINOR VERTICAL CRACKING OF BOTH ENDS WITH

EFFLORESCENCE.

58.3, 222.4 MINOR MAP CRACKING OF WEARING SURFACE. JOINTS ARE PAVED

OVER; MODERATE TRANSVERSE CRACKING WITH VEGETATION

GROWTH OF APPROACH PAVEMENT OVER JOINTS. ASPHALT IS

BEGINNING TO BREAK APART.

58.5,6, 60.9 MINOR TRANSVERSE CRACKING AND SCALING OF SIDEWALKS AND

PARAPETS. MINOR CRACKING OF EAST PARAPET, OUTSIDE ALONG

EAST CONSTRUCTION JOINT. MINOR EROSION AND UNDERMINING

OF PARAPET ENDS. MINOR SPLITTING AT BASE OF SEVERAL

ALUMINUM RAIL POSTS; SEVERAL POSTS HAVE SHEARED AT BASE

(REPAIRED SINCE LAST INSPECTION); RESULTING IN SOUTHEAST

RAIL BECOMING LOOSE. SEVERAL RAIL TO POST CONNECTION

WELDS HAVE BROKEN.

58.8 3' DIAMETER ACCESS HOLE IN SOUTH BOUND LANE OF BRIDGE.

UTILITY PIPE ALONG WEST SIDE OF STRUCTURE.

60.6 MINOR CRACKING WITH EFFLORESCENCE ON WINGWALLS. MINOR

RUST STAINING ON WEST WINGWALLS. MINOR DETERIORATION OF

MORTAR JOINTS. MINOR VEGETATION GROWTH ALONG TOPS OF

WINGWALLS.

60.13 MINOR SCALING OF COLUMNS. MINOR DIAGONAL CRACKING WITH

EFFLORESCENCE ON DOWNSTREAM PIER COLUMNS; CRACKS RUN

FROM BASE OF COLUMN (ATOP DAM) TO UNDERSIDE OF DECK.

60.16 MODERATE CRACKING, SPALLING, AND SCALING OF CONCRETE

SPILLWAY.

ABUTMENTS

1. BREASTWALLS OR COLUMNS G

2. PILE BENTS N

3. CAPS AND/OR BEARING SEATS N

4. BACKWALLS AND/OR BULKHEADS N

5. FOUNDATIONS N

6. WINGWALLS G

7. WEEP HOLES G

8. EXPANSION JOINTS N

9. EROSION AND/OR SCOUR F

10. SETTLEMENT OR DEFLECTION G

11. SLOPE PROTECTION N

12. OTHER N

PIER(S)

13. WALLS AND/OR COLUMNS F

14. PILE BENTS N

15. CAPS AND/OR BEARING SEATS N

16. FOUNDATIONS G

17. EROSION AND/OR SCOUR G

18. SETTLEMENT OR DEFLECTION G

19. OTHER N

FIELD INSPECTION REPORT STRUCTURE NO. 5140-097P

ITEM REFERENCE AND REMARKS

STREAM BED COMPOSITION :9.

AVERAGE CLEAR OPENING 8.

NORMAL VELOCITY 7.

ADEQUACY OF OPENING 6.

OTHER5.

WATERWAY OBSTRUCTIONS 4.

CHANNEL PROTECTION 3.

EROSION AND/OR SCOUR 2.

ALIGNMENT 1.

61. CHANNEL 8

G G G G N

HIGH

SUFF

5 FT.

ROCK, SAND

222. APPROACHES 7

1. APPROACH SLABS

2. RELIEF JOINTS

3. APPROACH GUARDRAIL

4. SURFACING

5. EROSION

6. SETTLEMENT

7. SIGNS

8. ALIGNMENT

9. OTHER (STRIPING)

N N N F G F N G G

223. RETAINING WALL 7

1. WALL

2. WEEP HOLES

3. FOUNDATION

4. EROSION AND/OR SCOUR

5. SETTLEMENT OR DEFLECTION

6. OTHER

G G N F G N

36. TRAFFIC AND SAFETY FEATURES

A. BRIDGE RAILINGS

B. TRANSITIONS

C. APPROACH GUARDRAILS

D. APPROACH GUARDRAIL ENDS

N N N

61.2 SEE BRIDGE FILE FOR SCOUR EVALUATION.

61.4 ARTIFICIAL LOGS ACROSS CHANNEL UPSTREAM FROM STRUCTURE

TO PREVENT BOATS FROM DRIFTING UNDER BRIDGE AND OVER

DAM STRUCTURE.

222.4,6 MINOR SETTLEMENT (APPROXIMATELY 1") AND MODERATE

TRANSVERSE CRACKING OF PAVEMENT AT NORTH APPROACH.

MODERATE TRANSVERSE CRACKING AT SOUTH APPROACH.

222.5 EROSION OF SOUTHWEST WINGWALL SLOPE DUE TO FOOT

TRAFFIC HAS BEEN REPAIRED WITH ASPHALT, ALTHOUGH NOW

THERE IS MINOR EROSION NEXT TO ASPHALT DUE TO RUNOFF.

223.1,4 MASONRY FACED CONCRETE RETAINING WALL AT SOUTHEAST

CORNER OF BRIDGE. MINOR EFFLORESCENCE FROM MORTAR

JOINTS. MODERATE EROSION ALONG SOUTHWEST RETAINING

WALL.

TRAFFIC SAFETY RATING CODES

N

Does not meet standards or a safety feature is required and none is provided.

Meets currently acceptable standards.

Not applicable or a safety feature is not required.

STRUCTURE LOAD RATING STRUCTURE NO. 5140-097P

TRUCK TYPE

INVENTORY RATING (NORMAL TRAFFIC) OPERATING RATING (MAXIMUM LOAD)

TONS METRIC TONS TONS METRIC TONS

H 19 17 31 28

HS 29 26 48 44

TYPE 3 25 23 41 37

TYPE 3S2 37 34 62 56

TYPE 3-3 46 42 76 69

DESIGN LOADING: H15 (M13.5)

X CAPACITY MEETS OR EXCEEDS DESIGN LOAD

CAPACITY IS LESS THAN DESIGN LOAD

ORIGINAL LOAD RATING CALCULATION APPLICABLE

ORIGINAL LOAD RATING CALCULATION REVISED

DATE OF LOAD RATING CALCULATION: 11/15

LOAD RATING CONTROLLED BY:

REMARKS: RATING IS BASED ON DESIGN LOAD OF STRUCTURE.

SEE BRIDGE FILE FOR LOAD RATING CALCULATIONS.

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5140-097P

STRUCTURE IDENTIFICATION

(201) PARK: BLUE RIDGE PARKWAY (1) STATE: ....................................... 374 - NORTH CAROLINA (NC)

(202) STRUCTURE NAME: .......... PRICE LAKE DAM BRIDGE (2) STATE HWY. AGENCY DIST:

(203) STRUCTURE KIND: ............1 - BRIDGE (3) COUNTY CODE: ........................ 189 - WATAUGA

(204) STRUCTURE NUMBER: ..... 5140-097P (4) CITY/PLACE CODE:

(205) NPS REGION: .................... 4 - SOUTHEAST (5) INVENTORY ROUTE:

(206) ROUTE CODE NUMBER: ... 1 (6) FEATURES INTERSECTED:....... PRICE LAKE DAM

(207) ROAD SECTION NO: ..........097P (7) FACILITY CARRIED: .................. BLUE RIDGE PARKWAY

(208) NPS ROAD CLASS: ............ 1 - PRINCIPAL PARK ROAD (8) STATE STRUCTURE NO: .......... 5140097P0000000

(209) WITHIN NPS BNDRY?: .......YES (9) LOCATION: ................................ 9.4 MILES FROM U. S. ROUT

(210) OPERATING UNIT: ............. BLUFFS (10) INV. RTE. - MIN. VERT. CLR: .. 99.99 FT (99.99 M)

(211) PROJECT NO(S): ................2G5 (11) MILE POINT: .............................296.64 (KM PT 477.38)

(212) DRAWING NUMBERS: ....... 3020 (27) YEAR BUILT:

(21) MAINTAINED BY: ................. 66 - NATIONAL PARK SERVICE (106) YEAR RECONSTRUCTED: .... N/A

(22) OWNER: ............................... 66 - NATIONAL PARK SERVICE (20) TOLL: ........................................3 - FREE ROAD

(37) HISTORICAL DESIGNATION: .. 5 - NOT ELIGIBLE

STRUCTURE DESCRIPTION, FOUNDATION, AND DECK TYPE

(43A) MAIN STR. MATERIAL: ..

(43B) MAIN STR. TYPE:

(45) NO. OF MAIN SPANS:

(48) MAX. SPAN LENGTH:

(49) STRUCTURE LENGTH:

(216A) ABUTMENT #1 FDN:

(216B) ABUTMENT #2 FDN:

(217A) PREDOM. PIER FDN.: ..

(217B) SECOND. PIER FDN: ...

(107) DECK TYPE:

2 - CONCRETE CONTINUOUS

01 - SLAB

40.0 FT (12.2 M)

110.0 FT (33.5 M)

5 - OTHER

5 - OTHER

5 - OTHER

5 - OTHER

1 - CONCRETE CAST-IN-PLACE

(44A) APPR. STR. MATERIAL: ........ 0 - OTHER

(44B) APPR. STR. TYPE: ................ 00 - OTHER

(46) NO. OF APPROACH SPANS: .. 0

(108) WEAR SURFACE/PROTECT SYSTEM:

A) TYPE WEARING SURFACE: .. 6 - BITUMINOUS

B) TYPE MEMBRANE: ................. 0 - NONE

C) TYPE PROTECTION: .............. 0 - NONE

(218) IS SALT USED?: ..................... NO

LOAD RATING AND POSTING

(31) DESIGN LOAD: ................. 2 - H15 (M13.5) (41) LOAD RESTRICTION: ......... A - OPEN, NO RESTRICTION

(66) INVENTORY RATING: ...... 29.0 TONS (26.3 METRIC TONS) (70) BRIDGE POSTING: .............. 5 - NO POSTING REQUIRED

(64) OPERATING RATING: ...... 48.0 TONS (43.5 METRIC TONS)

INSPECTION DATES

(90) INSPECTION DATE: 6/19 (91) FREQ. OF INSP: 24 MONTHS (92 / 93) CRITICAL FEATURE INSPECTION (CFI):

(219) ADD. STUDIES NEEDED: N - 0 - NONE (A) FRACTURE CRITICAL: ... NO

INSP. EVERY: MONTHS - LAST INSP. : (220) SPECIAL STUDY TYPE: 0 - NONE

(B) UNDERWATER: .............. NO

(221) SPECIAL STUDY DATE: INSP. EVERY: MONTHS - LAST INSP. :

(C) SPECIAL INSPECTION: .. NO

INSP. EVERY: MONTHS - LAST INSP. :

STRUCTURE INVENTORY AND APPRAISAL STRUCTURE NO. 5140-097P

GEOMETRY, TRAFFIC, AND NAVIGATIONAL DATA

(16) LATITUDE: ............................. 36°08'20.20"

(17) LONGITUDE: ......................... 81°43'54.20"

(19) DETOUR LENGTH: ............... 15 MI (24 KM)

(28A) LANES ON STRUCT:

(28B) LANES UNDER STRUCT: ... 00

(42A) SERVICE ON: ..................... 5 - HIGHWAY-PEDESTRIAN

(42B) SERVICE UNDER: .............. 5 - WATERWAY

(29) AVG. DAILY TRAFFIC:

(30) YEAR OF ADT:

(114) FUTURE ADT:

(115) YEAR OF FUTURE ADT:

(101) PARALLEL STRUCTURE: ... N - NONE

(38) NAVIGATION CONTROL?: ... 0

(39) VERTICAL CLEARANCE: ...... 0.0 FT (0.0 M)

(40) HORIZ. CLEARANCE: ........... 0.0 FT (0.0 M)

(111) ABUT. OR PIER PROT:

LATERAL UNDERCLEARANCE:

(55) RIGHT: ....................... 0.0 FT (0.0 M)

(56) LEFT: ......................... 0.0 FT (0.0 M)

(51) CURB TO CURB WIDTH:

(52) DECK WIDTH:

(32) APPR. ROADWAY WIDTH:

(213) APPR. PAVEMENT WIDTH:

LEFT SHOULDER:

RIGHT SHOULDER:

(33) BRIDGE MEDIAN:

(34) SKEW ANGLE:

(35) DECK FLARE?:

(47) TOTAL HORIZ. CLEARANCE:

(50) SIDEWALKS:

LEFT :

RIGHT :

(214) BRIDGE RAIL TYPE:

RAIL CONFIGURATION:

MATERIAL:

DESIGN TYPE:

(215) BRIDGE RAIL HEIGHT:

(53) MIN. VRT. CLEAR. OVER DECK:

(54) MIN. VRT. UNDERCLEARANCE:

26.0 FT (7.9 M)

36.3 FT (11.1 M)

34.0 FT (10.4 M)

24.0 FT (7.3 M)

5.0 FT (1.5 M)

5.0 FT (1.5 M)

0 - NO MEDIAN

0 °

NO

26.0 FT (7.9 M)

4.8 FT (1.5 M)

2.8 FT (0.9 M)

2 - MOUNTED ON PARAPET

3 - CONCRETE/STEEL

1 - CONTINUOUS RAIL

2.75 FT (0.84 M)

99.99 FT (99.99 M)

0.00 FT (0.00 M)

CONDITION AND APPRAISAL DATA, PROPOSED IMPROVEMENTS, AND COST

(58) DECK:

(59) SUPERSTRUCTURE:

(60) SUBSTRUCTURE:

(61) CHANNEL:

(62) CULVERT: ...........................N

(222) APPROACHES:

(223) RETAINING WALL:

(36) TRAFFIC SAFETY FEAT: ... 1NNN

(75A) TYPE OF WORK:

(75B) WORK DONE BY:

(76) IMPROVEMENT LENGTH: ..

(67) STRUCTURAL EVALUATION:

(68) DECK GEOMETRY:

(69) UNDERCLEARANCES:

(71) WATERWAY ADEQUACY:

(72) APPROACH ALIGNMENT:

(113) SCOUR CRITICAL:

(225) PURPOSE OF IMPROVEMENT:

(226) PRIORITY OF IMPROVEMENT:

(227) MAINTENANCE COST:

(228) REHAB./RECONSTR. COST: ...

(229) CONSTRUCTION COST:

N

5 - Stable; scour within limits of

2 - REHAB/RECONSTRUCTION

D - MINOR

ADDITIONAL INFORMATION

(230) STRUCTURE HISTORY:

1990-WEARING SURFACE PLACED.

(231) ADDITIONAL CONSIDERATIONS:

(330) ADDITIONAL CONFIG. INFO.:

https://81�43'54.20 https://36�08'20.20

PHOTOGRAPHS STRUCTURE NO. 5140-097P

PHOTO #1 - LOOKING NORTH TOWARD BLOWING ROCK

FLOW

PHOTO #2 - EAST (UPSTREAM) SIDE

PHOTO #3 - GENERAL TOPSIDE VIEW

LOOKING NORTH

PHOTO #4 - TRANSVERSE CRACKING OVER

BACKWALL OF DAM; NOTE .5" OF

SETTLEMENT AND VEGETATION GROWTH

PHOTO #5 - TRANSVERSE CRACKING OF

SOUTH APPROACH PAVEMENT

PHOTO #6 - 1.5' LONG BY 5" WIDE BY 4" DEEP

POTHOLE AT NORTH APPROACH IN

NORTHBOUND LANE

PHOTO #7 - UP TO 1FT DROP OFF AT

NORTHEAST END OF SIDEWALK

PHOTO #8 - LOOSE HANDRAIL ON SOUTHEAST

SIDE

PHOTO #9 - BENT HANDRAIL ON NORTHEAST SIDE

PHOTO #10 - MISSING MORTAR ON SOUTHEAST PARAPET

PHOTO #11 - VERTICAL CRACK IN WELDING AT THIRD HANDRAIL FROM

SOUTHEAST END OF MASONRY; NOTE

PHOTO #12 - NORTHWEST WINGWALL; NOTE DETERIORATION OF

MASONRY MORTAR JOINTS

PHOTO #13 - NORTH FACE OF NORTH PIER CAP

PHOTO #14 - DIAGONAL CRACKING WITH EFFLORESCENCE ON WEST

COLUMN OF NORTH PIER

PHOTO #15 - ANOTHER VIEW OF PREVIOUS PHOTO, NOTE DIAGONAL

CRACKING WITH EFFLORESCENCE ON WEST COLUMN AT NORTH PIER

PHOTO #16 - WEST SIDE OF SLAB; VERTICAL CRACKING WITH

EFFLORESCENCE AND TRANSVERSE CRACKING ON OVERHANG

UNDERSIDE

PHOTO #17 - CRACKING AND DETERIORATION

OF SPILLWAY

PHOTO #18 - CRACKING AND DETERIORATION

OF THE SPILLWAY, SOUTHWEST SIDE SHOWN

PHOTO #19 - HORIZONTAL CRACK WITH EFFLORESCENCE ON EAST

COLUMN OF SOUTH PIER

PHOTO #20 - SOUTH FACE OF SOUTH PIER CAP

PHOTO #21 - SOUTHWEST WINGWALL; NOTE EFFLORESCENCE FROM

MORTAR JOINTS

PHOTO #22 - SOUTHEAST WINGWALL

PHOTO #23 - UPSTREAM CHANNEL

PHOTO #24 - DOWNSTREAM CHANNEL