PUB (WRN) CCTV Inspection Requirements for Sewers and Manholes

Transcription

1 PUB (WRN) CCTV Inspection Requirements for Sewers and Manholes 1. PUB WRN Planning Division shall provide to QP the PUB s Geographic Information System (GIS) sewer IDs, the length of sewer(s), manhole IDs, the depth of manhole(s) and the year of commission of the sewer(s) and manhole(s). These IDs must be included in the CCTV inspection reports, JPEG photographs and MPEG/AVI videos. 2. For all CCTV inspections, both sewers and the adjoining manholes must be inspected and their condition assessment documented per the CCTV Inspection Requirements prescribed in this document in particular the submissions formats shown in Appendix A and B. Submissions which are not in accordance with the format will be deemed as non-compliant, incomplete and will be rejected. 3. All description of defects, findings and abnormalities shall be in full. Defects classification shall be in accordance with the WRc/WAA "Manual of Sewer Condition Classification" 4 th Edition or prevalent edition. Photographic evidence of each defect must be taken and included in the CCTV Inspection Report. Guidance notes on WRc defect classification is provided in Appendix C. Please refer for the complete WRc/WAA manual. 4. From 1 Jan 213, PUB only accepts CCTV inspection and reports from PUB Registered CCTV contractors. The list of latest PUB registered CCTV contractors is available in our website, 5. Prior to CCTV inspection, hydraulic cleaning of sewer(s) and manhole(s) must be carried out to assess their condition with an unobstructed view of their surfaces. 6. CCTV inspection of all sewers must cover the entire pipe length and should be carried out during low flow period (ideally water level should be less than 3% of the pipe diameter) for adequate viewing of the sewer condition. 7. If sewer is found be unable to be inspected due to surcharge condition even after the hydraulic cleaning. QP shall consult PUB (WRN), Network Management Branch for assistance. QP may contact the PUB (WRN), Network Management Branch via the PUB ONE Hotline at CCTV Inspection Video Recording for sewer(s) and manhole(s) 8. The positioning of the CCTV camera lens shall be in a stable condition and above the liquid flow line near the central axis of the sewer(s) and manhole(s). The speed of the CCTV unit in the sewer(s) and manhole(s) shall be limited to.2 m/s to enable all details to be extracted from the video recording. 9. QP shall ensure that all CCTV videos recording shall be of high quality recording and in a stable condition. During televising, the illumination must be adequate to provide an accurate and clear record of the entire sewer s and manhole s internal condition. As a minimum, the quality of the photos and video should be equivalent to the photos shown in Appendix A and B. 1. All documents including recordings should be submitted in DVD discs and no tape media will be accepted. 1-6 Ver 2. (Dec12)

2 11. Submission format of video and photos should be in MPEG/AVI and JPEG format respectively. 12. Each individual entire length pipe between manhole to manhole must be included in a single MPEG/AVI video file, except if a reverse set up is required due to an obstruction, in which case the reverse inspection shall be contained in a separate file. 13. Each individual manhole must be included in a separate MPEG/AVI video file. 14. At the start of each pipe length being inspected, the length of pipeline from zero chainage up to the cable calibration point shall be recorded and reported in order to obtain a full record of the pipe length. The meter reading entered on to the data display at the cable calibration point must allow for the distance from the start of the survey/inspection to the cable calibration point such that the chainage at the start of the survey is zero. The running footage display shall be consistence with the actual distance of the pipe from the start of the pipe length. (i) At the start of each sewer pipe length, a data generator shall electronically generate and clearly display on the viewing monitor and video recording a record of data in alphanumeric form containing the following minimum information: Project Reference Number Type of Survey: Pre-Con / Post Con / Before DLP / End DLP Sewer GIS ID Upstream and downstream manhole GIS IDs Sewer pipe diameter Sewer pipe material Direction of unit travel Road name/location Date and time of survey CCTV company name Upstream and downstream (or from and to ) manhole GIS numbers of inspected pipe segment Automatic update of the unit's chainage position in the pipeline from adjusted zero The text should be clearly displayed on a contrasting background for approximately 15 seconds. If the CCTV inspection is being performed on consecutive pipe segments with the same setup, this text information must be provided at the start of each pipe segment and the separate pipe segment will have to be saved in separate MPEG/AVI video file. (ii) During CCTV inspection, the running screen must include the following information. The display of this information must in no way obscure the central focus of the pipe being inspected. 2-6 Ver 2. (Dec12)

3 Project Reference Number Type of Survey: Pre-Con / Post Con / Before DLP / End DLP Sewer GIS ID Upstream and downstream manhole GIS IDs Sewer pipe diameter Sewer pipe material Direction of unit travel Road name/location Date and time of survey Upstream and downstream (or from and to ) manhole GIS numbers of inspected pipe segment Running footage (distance travelled) (iii) At the end of CCTV inspection of the inspected pipe segment, the ending screen text should indicate: Project Reference Number Type of Survey: Pre-Con / Post Con / Before DLP / End DLP Sewer GIS ID Upstream and downstream manhole GIS IDs Sewer pipe diameter Sewer pipe material Direction of unit travel Road name/location Date and time of survey Upstream and downstream (or from and to ) manhole GIS numbers of inspected pipe segment Ending footage The text should be clearly displayed on a contrasting background for approximately 15 seconds. 15. The video shall be free of all electrical interference and excessive background noise. Digital video recording playback shall be at the same speed that it was recorded. 16. The CCTV survey inspection shall include: (i) (ii) Preparation Prior to Inspection. Pipelines/manholes/inspection chambers to be inspected shall be hydraulically cleaned to assess their conditions with an unobstructed view of their surfaces over the complete pipe length. The pipelines and manholes shall be cleaned to enable existing cracks and corrosion to be clearly recorded on video printouts. Sequence of CCTV Inspection. After cleaning, both the sewers and the adjoining the adjoining manhole shall be visually inspected by means of CCTV camera system. The inspection will be done one manhole-to-manhole pipe section at a time. Each series of runs shall be recorded on a separate file. (iii) Direction of CCTV. The direction of unit travel shall be in the direction of flow in the pipe unless access to the upstream manhole is not possible or the unit cannot pass through the pipe from the end-to-end in the direction of flow, in which case a reverse setup will be allowed. In this case, this shall highlight the 3-6 Ver 2. (Dec12)

4 detailed issue in the CCTV inspection report. (iv) (v) Manhole condition assessment. CCTV inspection shall be carried out to all the manholes adjoining to the inspected sewers. All observations and findings shall be highlighted on the separate Manhole Inspection Report. Manhole inspection shall include (but not limited to) the following structural defects:- (1) Damage manhole frames and/or covers (including rocking manholes) (2) Signs of inflow/infiltration/exfiltration from the manhole walls (3) Damage benching QP shall re-clean and re-cctv survey inspection the sewerage pipe if the view of the televised sewer(s) and manhole(s) is obstructed and/or not clear. (vi) Camera Selection Sewerage pipes of sizes up to 45mm (inclusive) shall require CCTV unit with pan and tilt facilities. For sewer(s) more than 45mm diameter, CCTV unit with pan, tilt and zoom facilities shall be used to allow clear interpretation of all defects and its severity. Documents to be submitted to PUB(WRN) and submission Format 17. Upon the completion of each and every required survey inspection work, the results obtained from the CCTV survey of the sewer line(s) and the adjoining manhole(s) are to be incorporated into the CCTV Inspection Report. 18. QP shall submit all the following items to the PUB (WRN), Network Management Branch: (i) Hardcopy of computer generated (not hand-written) CCTV Survey Inspection Report on condition of each sewer segment inspected between manholes shall be reported in accordance with the sample format (shown in Appendix A). This report shall contain an overall plan of the pipeline(s) and manhole(s) inspected during the period, structural assessment and a summary of the findings. The sewer report shall be labelled as: Sewer GIS ID-mmddyy-C-Project Ref no.- PreCon / Post Con / Before DLP / End DLP Naming Convention Sewer GIS ID Mmddyy C Project Ref no. Pre-Con / Post Con / Before DLP / End DLP Description Sewer GIS ID being inspected Date of CCTV inspection CCTV inspection Project reference number Select the type of survey (ii) Hardcopy of computer generated CCTV Survey Inspection Report on condition of each manhole inspected shall be reported in accordance with the sample format (shown in Appendix B). This report shall contain an overall plan of the manhole inspected during the period, structural assessment and a summary of the findings. 4-6 Ver 2. (Dec12)

5 The manhole report shall be labelled as: Manhole GIS ID-mmddyy-C-Project Ref no.- Pre-Con / Post Con / Before DLP / End DLP Naming Convention Manhole GIS ID Mmddyy C Project Ref no. Pre-Con / Post Con / Before DLP / End DLP Description Manhole GIS ID being inspected Date of CCTV inspection CCTV inspection Project reference number Select the type of survey (iii) A DVD disc containing the softcopy of CCTV survey inspection reports (in PDF format) and CCTV videos. The top face of the DVD media shall be labelled-printed (Sewer GIS IDs-mmddyy-streetname-Project Ref no.-pre-con / Post Con / Before DLP / End DLP). Each sewer and manhole shall be saved in the respective individual folders. The naming convention for each folder (sewer and manhole) and the corresponding CCTV survey inspection report and video is shown below: (a) Each sewer segment should be saved in individual folder. Naming convention is as follows: Sewer Folder (Folder Name: Sewer GIS ID-mmddyy-C-Project Ref no.) (i) A PDF softcopy of the CCTV Inspection Report of the sewer segment. Save CCTV report as: Sewer GIS ID-mmddyy-C-Project Ref no.-pre-con / Post Con / Before DLP / End DLP.pdf (ii) Sewer CCTV survey video in MPEG/AVI format Save as: Sewer GIS ID-mmddyy-C-Project Ref no.-pre-con / Post Con / Before DLP / End DLP.mpeg or avi (b) Each manhole should be saved in individual folder. Naming convention is as follows: Manhole Folder (Folder Name: Manhole GIS ID-mmddyy- Project Ref no.) (i) A PDF softcopy the CCTV Inspection Report of the manhole inspected. Save CCTV report as: Manhole GIS ID-mmddyy-Project Ref no.-pre-con / Post Con / Before DLP / End DLP.pdf (ii) Manhole CCTV survey video in MPEG/AVI format Save as: Manhole GIS ID-mmddyy-Project Ref no.-pre-con / Post Con / Before DLP / End DLP.mpeg or avi 19. Any errors in recording, CCTV imagery, unclear video printouts and/or error in interpretation of the sewer(s) and/or manhole(s) defect, shall be rejected. CCTV SURVEY - VIDEO PRINTOUTS FOR HARDCOPY REPORT SUBMISSIONS 2. QP shall ensure that all video printouts shall be of high quality colour video printing and must clearly shows details and accurately reflect what is displayed from the 5-6 Ver 2. (Dec12)

6 monitor. The minimum size of the video prints shall be 1mm x 75mm. The photographic evidence (Video prints) of defects and abnormalities must be included in the CCTV Inspection Report. 21. Video prints shall be taken in the event of the following observation and findings: (i) (ii) (iii) (iv) Photographic evidence (video prints) shall be taken for all suspected defects. That is sewer pipes fractures, broken, collapse, deformation, displaced, sunken, pipes with sever joint displacement and abnormalities, sewer Liners suffering from peeling, deformation, bulging, broken, collapse etc and abnormalities, lateral openings where there is accumulation of debris at particular localized spots etc that the CCTV specialist comes across during the CCTV assessment. Where video prints are not otherwise required for a generally well maintained sewer (i.e. no evidence of defects or abnormalities etc) then video prints shall be taken for every and successive 15m interval of a sewer segment inspected, a general condition video print shall be taken (allows one to determine the changes of sediments level etc over the entire length of sewer inspected). To illustrate degree of mortar loss, size of a crack or facture, size of a void or any other quantifiable defect and a suitable metric scale shall be included in the clearly focus video printout. Where a video printout is taken to illustrate a specific defect, it shall occupy the central part of the video printout and be clearly in focus and accurately reflect the defect. QP shall ensure that all submissions of all videos and photographs are of good clarity. All defects including obstructions and abnormalities on junctions, connections, manholes and pipeline. Where a defect is continuous or repeated, the video printouts shall be taken at the beginning of the defect and at not less than 5m intervals thereafter. 22. If not clearly shown in the CCTV report submission, the PUB (WRN) may instruct the QP to provide additional CCTV video printouts at locations of defects and other locations of significant interest, the number of which is expected to be minimal. 23. QP shall ensure all printed video printouts shall be clearly identified and systematically annotated in relation to the following: (i) Sewer and manhole GIS IDs (ii) Date & Time of the inspection (iii) Chainage defect (iv) Type of Defect (v) Defect code The annotation shall be clearly visible and in contrast to its background, shall have a figure size no greater than 5mm, and be type printed. The annotation shall be positioned so as not to interfere with the subject of the video printout. 6-6 Ver 2. (Dec12)

7 Table of Contents Profile Report 1 Inspection: Sewer 1981 Legend of Classification 2 Section: 1 3

8 Project Reference No.: A Pre-Con / Main sections No. Upstream MH Downstream MH Date Road DVD No. Material SIP Length CCTV Length /5/29 Dalvey Estate 559 Vitrified clay m 75.9 Pipe size: 3 = 75.9 m (75.9 m) All sections = 75.9 m (75.9 m) CCTV - Dalvey Estate // Page: 1

9 Project Reference No.: A Defect Grade Description / Inspection: Sewer ID : No Structural Defects Pre-Con Acceptable Structural Condition 2: Circumfrential crack, Moderate joint defects, Spalling slight, Wear slight Minor collapse risk in short term but potential for further deterioration 3: Fractures with deformation up tp 5%, Longitudinal cracking or mulitlpe cracking, Minor loss of level, More severe joint defects, Spalling medium, Wear medium! Collapse unlikely in near future but future deterioration likely! 4: Broken, Deformation up to 1% and broken,, Fractured with deformation 5-1%, Multiple fractures, Serious loss of level, spalling large, wear large!! Collapse likely in foreseeable future!! 5: Already collapsed, Deformation over 1% and broken, Extensive areas of fabric missing, Fractured with deformation over 1%!!! Collapsed or collapse imminent!!! CCTV - Dalvey Estate // Page: 2

10 Sewer CCTV Inspection Report / Inspection: Sewer ID 1981 Survey Date : Type of Survey: Year Commissioned : Sewer GIS-ID : Operator : Team Supervisor : 5/5/29 Pre-Con G. Karthikeyan G. Karthikeyan Start Time : Weather : Camera : Full Segment CCTV : Cleaned : WRC Certified : 14:24: Dry IBAK Argus 5 Yes Yes Jhon Feliciano Road : Dalvey Estate Project Reference No : A US MH GIS-ID : Place : Bukit Timah DS MH GIS-ID: Location Details: Near Block No. 28 SIP Length : Location Code: Road CCTV Length : Grease Found (N/M/H) : Nil Purpose : Direction of Survey : Downstream Pipe Size (mm): Water Level (US) : 1% Pipe Material : Water Level (DS) : 1% Lining : Comment : m 75.9 m To assess pipe condition 3 mm Vitrified clay N/A CCTV inspection found the entire sewer pipeline is structurally sound and has no defect. 1:378 Position Code Observation Video Photo Grade Depth: 5.3 / Cover level: N ST Start of survey, downstream direction : V1P1-C.jpg.1 GP General photograph reference 2 : V1P2-C.jpg 4.7 GP General photograph reference 3 1: V1P3-C.jpg 9.8 GP General photograph reference 4 2: V1P4-C.jpg 15.8 GP General photograph reference 5 4: V1P5-C.jpg 19.9 GP General photograph reference 6 4: V1P6-C.jpg 25. GP General photograph reference 7 5: V1P7-C.jpg 3.8 GP General photograph reference 8 6: V1P8-C.jpg 36.1 GP General photograph reference 9 7: V1P9-C.jpg 4.9 GP General photograph reference 1 7: V1P1-C.jp g 45.1 GP General photograph reference 11 8: V1P11-C.jp g CCTV - Dalvey Estate // Page: 3

11 Inspection Report / Inspection: Sewer ID 1981 Date : Type of Survey: Year Commissioned : Sewer GIS-ID : Operator : Team Supervisor : 5/5/29 Pre-Con G. Karthikeyan G. Karthikeyan Start Time : Weather : Camera : Full Segment CCTV : Cleaned : WRC Certified : 14:24: Dry IBAK Argus 5 Yes Yes Jhon Feliciano 1:378 Position Code Observation Video Photo Grade 5.1 GP General photograph reference 12 8: V1P12-C.jp g 55.2 GP General photograph reference 13 9: V1P13-C.jp g 6.3 GP General photograph reference 14 1: V1P14-C.jp g 65.3 GP General photograph reference 15 1: V1P15-C.jp g 7.3 GP General photograph reference 16 11: V1P16-C.jp g 75. GP General photograph reference 17 13: V1P17-C.jp g FH Finish Survey 15: V1P18-C.jp Depth: 5.6 / Cover level: P g STR no def STR peak STR mean STR total STR grade SER no def SER peak SER mean SER total SER grade 1 1 CCTV - Dalvey Estate // Page: 4

12 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 IBAK Argus 5 G. Karthikeyan Photo: P1-C.jpg m, Start of survey, downstream direction Photo: P2-C.jpg.1m, General photograph reference 2 CCTV - Dalvey Estate // Page: 5

13 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 IBAK Argus 5 G. Karthikeyan Photo: P3-C.jpg 4.7m, General photograph reference 3 Photo: P4-C.jpg 9.8m, General photograph reference 4 CCTV - Dalvey Estate // Page: 6

14 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 2. IBAK Argus 5 G. Karthikeyan Photo: P5-C.jpg 15.8m, General photograph reference 5 Photo: P6-C.jpg 19.9m, General photograph reference 6 CCTV - Dalvey Estate // Page: 7

15 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 IBAK Argus 5 G. Karthikeyan Photo: P7-C.jpg 25m, General photograph reference 7 Photo: P8-C.jpg 3.8m, General photograph reference 8 CCTV - Dalvey Estate // Page: 8

16 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 IBAK Argus 5 G. Karthikeyan Photo: P9-C.jpg 36.1m, General photograph reference 9 Photo: P1-C.jpg 4.9m, General photograph reference 1 CCTV - Dalvey Estate // Page: 9

17 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 IBAK Argus 5 G. Karthikeyan Photo: P11-C.jpg 45.1m, General photograph reference 11 Photo: P12-C.jpg 5.1m, General photograph reference 12 CCTV - Dalvey Estate // Page: 1

18 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 IBAK Argus 5 G. Karthikeyan Photo: P13-C.jpg 55.2m, General photograph reference 13 Photo: P14-C.jpg 6.3m, General photograph reference 14 CCTV - Dalvey Estate // Page: 11

19 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 IBAK Argus 5 G. Karthikeyan Photo: P15-C.jpg 65.3m, General photograph reference 15 Photo: P16-C.jpg 7.3m, General photograph reference 16 CCTV - Dalvey Estate // Page: 12

20 Inspection pictures / Inspection: Sewer ID 1981 Place : Road : Date : Camera : Operator : Bukit Timah Dalvey Estate 5/5/29 IBAK Argus 5 G. Karthikeyan Photo: P17-C.jpg 75m, General photograph reference 17 Photo: P18-C.jpg 75.9m, Finish Survey CCTV - Dalvey Estate // Page: 13

21 Manhole Report / Inspection: Manhole ID Survey Date : Type of Survey : Weather : Manhole GIS-ID: Operator. : Team Supervisor : 4/13/29 Pre-Con Dry Andrew Chan Start Time : Yr. Commission: Camera : WRc Certified : Cleaned: 16:: 1968 IBAK Orion Street : Tampines Ind Ave. 5 Chamber Size: 195 Cover Size : Road : Tampines Material: Concrete Material : loc. Details : Outside the factory Shape: circular Shape : Location Code: Turf Cover Good Condition Frame Good Condition : Water Level : 2% SIP Depth : Channel Level : Yes CCTV Depth : Remarks : Yes Yes Cast Iron Double Triangular CCTV inspection found the entire manhole shaft, benchings and inverts including manhole cover and frame are in good condition. No. OP Pos Observation NO_Cl NO_Cl NO_Q Grade Remark ass1 ass2 uant1 1 GP. General Photograph, Manhole Surrounding Location 1 Good condition 2 GP. General Photograph, Manhole Cover 1 Good condition 3 GP. General Photograph, Shaft & Frame 1 Good condition 4 GP.2 General Photograph, Chamber Well 1 Good condition 5 GP 2.2 General Photograph, Chamber Well 1 Good condition 6 GP 4.1 General Photograph, Backdrop 1 Good condition 7 GP 5. General Photograph, Manhole Benching 1 Good condition 8 GP 5.8 General Photograph, Outgoing pipe 9 GP 5.8 General Photograph, Manhole Invert 1 GP 5.8 General Photograph, Incoming pipe 1 Good condition 1 Good condition 1 Good condition Coverplates No. Type Cover Shape Material Breadth/Widt Ground Invert Class MH-ID h [mm]/width Level Level 1 Heavy Duty Double Triangular Cast iron In- No. /outlets o' clock Type Shape Diameter/W Depth Material From MH To MH Water Level Channel Observation idth (mm)/wto invert 1 12 in circular Concrete % No Defect 2 6 out circular Concrete % No Defect Tampines Ind Ave5-C // Page: 1

22 Appendix B Manhole Pictures / Inspection: Manhole ID Survey Date : 4/13/29 Start Time : 16:: Type of Survey : Pre-Con Yr. Commission: 1968 Weather : Dry Camera : IBAK Orion Manhole GIS-ID : WRc Certified : Andrew Chan MH Photo: P1-C.JPG General Photograph, Manhole Surrounding Location MH Photo: P2-C.JPG General Photograph, Manhole Cover Tampines Ind Ave5-C // Page: 2 Operator : Andrew Chan Team Supervisor : Andrew Chan Cleaned : Yes

23 Manhole Pictures / Inspection: Manhole ID Survey Date : Job Number : Weather : Manhole GIS-ID : Operator : Team Supervisor : 4/13/ /EM3 Dry Andrew Chan Start Time : Yr. Commission: Camera : WRc Certified : Cleaned : 16:3: 1968 Andrew Chan Yes Photo: P3-C.JPG General Photograph, Shaft & Frame Photo: P4-C.JPG General Photograph, Chamber Wall Tampines Ind Ave5-C // Page: 3

24 Manhole Pictures / Inspection: Manhole ID Survey Date : Type of Survey : Weather : Manhole GIS-ID : Operator : Team Supervisor : 4/13/29 Pre-Con Dry Andrew Chan Start Time : Yr. Commission: Camera : WRc Certified : Cleaned : 16:: 1968 Andrew Chan Yes Photo: P5-C.JPG General Photograph, Chamber Wall Photo: P6-C.JPG General Photograph, backdrop Tampines Ind Ave5-C // Page: 4

25 Manhole Pictures / Inspection: Manhole ID Survey Date : Type of Survey : Weather : Manhole GIS-ID : Operator : Team Supervisor : 4/13/29 Dry Andrew Chan Start Time : Yr. Commission: Camera : WRc Certified : Cleaned : 16:: 1968 Andrew Chan Yes Photo: P7-C.JPG General Photograph, Manhole Benching Photo: P8-C.JPG General Photograph, Outgoing pipe Tampines Ind Ave5-C // Page: 5

26 Manhole Pictures / Inspection: Manhole ID Survey Date : Type of Survey : Weather : Manhole GIS-ID : Operator : Team Supervisor : 4/13/29 Pre-Con Dry Andrew Chan Start Time : Yr. Commission: Camera : WRc Certified : Cleaned : 16:: 1968 Yes Photo: P9-C.JPG General Photograph, Manhole Invert Photo: P1-C.JPG General Photograph, Incoming pipe Tampines Ind Ave5-C // Page: 6

27 Appendix C - Pg 1/5 GRADING OF INTERNAL CONDITION OF PIPE GRADE INTERNAL CONDITION TYPICAL DEFECT DESCRIPTIONS 5 Already collapsed Deformation >1% and broken Extensive areas of fabric missing Fracture with deformation >1% 4 Broken Deformation up to 1% and broken Fracture with deformation 5-1% Multiple fracture Serious loss of level Spalling large Wear large 3 Fracture with deformation <5% Longitudinal cracking or multiple cracking Minor loss of level More severe joint defects, I.e. open joint (large) or joint displaced (large) Spalling medium Wear medium 2 Circumferential crack Moderate joint defects, I.e. open joint (medium) or joint displaced (medium) Spalling slight Wear slight No structural defects 1 Grade Implication 5 Collapsed or collapse imminent 4 Collapse likely in foreseeable future 3 Collapse unlikely in near future but further deterioration likely 2 Minimum collapse risk in short term but potential for further deterioration 1 Acceptable structural condition The worst defect along the individual sewer length is used to give a single condition grade for that particular sewer length, i.e. the grade for the sewer length is based on the highest internal condition grade along the sewer length.

28 Appendix C - Pg 2/5 STANDARD CCTV CODING FORM CONDITION CODES, WRC NB. Any code with a J at the end ie CCJ refers to a defect that occurs within the area of a joint in the pipe. TYPE CODE DESCRIPTION PIPE CL CRACKED - LONGITUDINAL CC CRACKED - CIRCUMFERENTIAL CM CRACKED - MULTIPLE FL FRACTURE - LONGITUDINAL FC FRACTURE - CICUMFERENTIAL FM FRACTURE - MULTIPLE B BREAK D DEFORMED X COLLAPSED JDS JOINT DISPLACED - SLIGHT JDM JOINT DISPLACED - MEDIUM JDL JOINT DISPLACED - LARGE OJS OPEN JOINT - SLIGHT OJM OPEN JOINT - MEDIUM OJL OPEN JOINT - LARGE SS SURFACE DAMAGE - SPALLING SW SURFACE DAMAGE WEAR BRICK MS MORTAR MISSING - SURFACE MM MORTAR MISSING - MEDIUM MT MORTAR MISSING - TOTAL DB DISPLACED BRICK MB MISSING BRICKS DV DEFORMED VERTICALLY DH DEFORMED HORIZONTALLY DI DROPPED INVERT SERVICE RF ROOTS - FINE CONDITION RM ROOTS - MASS RT ROOTS - TAP IS INFILTRATION - SEEPER ID INFILTRATION - DRIPPER IR INFILTRATION - RUNNER IG INFILTRATION - GUSHER EH ENCRUSTATION - HEAVY EM ENCRUSTATION - MEDIUM EL ENCRUSTATION - LIGHT ESH SCALE - HEAVY ESM SCALE - MEDIUM ESL SCALE - LIGHT DE DEBRIS DES DEBRIS - SILT DEG DEBRIS - GREASE OB OBSTRUCTION WL WATER LEVEL LL LINE OF SEWER DEVIATES LEFT LR LINE OF SEWER DEVIATES RIGHT LU LINE OF SEWER DEVIATES UP LD LINE OF SEWER DEVIATES DOWN

29 Appendix C - Pg 3/5 STANDARD CCTV CODING FORM CONDITION CODES, WRC (Continued) TYPE CODE DESCRIPTION CONSTRUCTION JN JUNCTION X DEFECTIVE JUNCTION CN CONNECTION CNI CONNECTION INTRUDING CX DEFECTIVE CONNECTION CXI DEFECTIVE CONNECTION INTRUDING MH MANHOLE MISCELLANEOUS ST START OF SEWER SURVEY LENGTH FH FINISH OF SEWER SURVEY LENGTH SA SURVEY ABANDONED DC DIMENSION OF SEWER CHANGES LC SEWER LINING CHANGES MC MATERIAL CHANGE SC SHAPE CHANGE PC PIPE LENGTH CHANGE V VERMIN (RATS OR MICE) GP GENERAL PHOTOGRAPH CU CAMERA UNDER WATER LL LINE OF SEWER DEVIATES LEFT LR LINE OF SEWER DEVIATES RIGHT LU LINE OF SEWER DEVIATES UP LD LINE OF SEWER DEVIATES DOWN CONSTRUCTION JN JUNCTION FEATURE JX DEFECTIVE JUNCTION CN CONNECTION CNI CONNECTION INTRUDING CX DEFECTIVE CONNECTION CXI DEFECTIVE CONNECTION INTRUDING MH MANHOLE

30 Appendix C - Pg 4/5 STANDARD CCTV CODING FORM GENERAL - HEADER FIELDS NAME CODE DESCRIPTION PIPING USE D Downstream U Upstream PIPING SHAPE A Arched B Barrel C Circular E Egg Shaped H Horseshoe O Oval R Rectangular S Square T Trapezoidal U U-shaped with flat top X Other PIPING MATERIAL AK Alkathene AC Asbestos Cement BR Brick CI Cast Iron SI Spun Iron CO Concrete CSB Concrete Segments Bolted CSU Concrete Segments Unbolted CC Concrete Box Culvert DI Ductile Iron GRC Glass Reinforced Cement GRP Glass Reinforced Plastic PSC Plastic/Steel Composite PVC Polyvinyl chloride PE Polyethelene RC Reinforced Concrete RPM Reinforced Plastic Matrix ST Steel VC Vitrified Clay PP Polypropolene PF Pitch Fibre MAC Masonry in random courses XXX Other ZZZ Not Known PIPING LINING SSW Steel Reinforced Spiral Wound PVC GRP Glassfiber Reinforced Plastic EPX Epoxy Resin POL Polyester Resin XXX Other ZZZ Not Known

31 Appendix C - Pg 5/5 STANDARD CCTV CODING FORM GENERAL - HEADER FIELDS (Continued) NAME CODE DESCRIPTION PURPOSE A Adhoc inspection - related to structural or service condition defects B Adhoc inspection - related to blockage D Pre-Condition Existing Sewer inspection E Post-Condition Existing Sewer inspection F Before DLP - New Sewer inspection G End DLP - New Sewer inspection H Scheduled planning - inspection I Associated with future capital scheme J Resurvey for any reason X Other WEATHER 1 Dry 2 Heavy Rain 3 Light Rain 4 Showers LOCATION A On Road - General B On Road - Junction C On Road Expressway/Highway D Inside building/covered car-park E Footpath/Pavement F Fields/Turf G Gardens/Backyard (within private property) H Kitchen (within private property) I Inside heavy vegetation