BUILD OVER SEWER (BOS) ASSESSMENT MANUAL

Transcription

1 BRISBNE CITY COUNCIL BUILD OVER SEWER (BOS) SSESSMENT MNUL To be used in conjunction with Council s Build Over Sewer Request for Consent forms: Part 1 Request for Consent Part 2 ssessment VERSION: 02/2010 Please check you are using the latest version of this document applicable as at the date of making your Request for Consent

2 CONTENTS PRT GENERL INFORMTION Background... 4 The Fast Track BOS (FT-BOS) process... 4 pplication... 4 The FT-BOS process does not apply to... 5 How to request consent using the FT-BOS process... 5 Council s consent... 6 Damage to Council s infrastructure... 6 PRT B TECHNICL DRWINGS ccess Figure 1 ccess to sewer connection in driveway... 8 Footings FIGURE 2 Clearances for pad and strip footings... 9 Bridging examples FIGURE 2B Examples of bridging FIGURE 2C Example of shallow bridging FIGURE 2D Example of bridging beam arrangement FIGURE 2E Example of bridging beam arrangement FIGURE 2F Example of bridging beam arrangement Retaining walls FIGURE 3 Clearance requirements where wall is built over owner s sewer connection Excavations FIGURE 4 Clearances for excavations BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 2 of 15

3 PRT GENERL INFORMTION BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 3 of 15

4 Background The Water Supply (Safety & Reliability) ct 2008 requires that persons undertaking any of the following a receive written consent from Council before undertaking such activities: building over Council s sewerage infrastructure; interfering with access to Council s sewerage infrastructure; increasing or reducing the cover over Council s sewerage infrastructure; changing the surface of land in a way causing ponding of water over an access chamber for Council s sewerage infrastructure. For the above activities relating to sewerage infrastructure, Council may grant consent either through: the Fast Track BOS process; or a Council assessment process undertaken by Council officers. The Fast Track BOS (FT-BOS) process The Fast Track BOS process is known as the FT-BOS process. The FT-BOS assessment process is undertaken by Private Certifiers or Registered Professional Engineers, external to Council. The Request for Consent together with the prescribed accompanying material must then be lodged with Council. Council requires that assessments be undertaken using the FT-BOS process wherever possible. This Manual applies to the FT-BOS process. pplication The FT-BOS process applies to all building work that is assessable development under the SP Schedule 3 Regulations and all filling, excavation and slab work, being activities with respect to sewerage infrastructure not exceeding 225 mm in diameter, when: building/structures, filling/excavation, footings (including bored piers/screw piers) or slabs are to be located within 2m horizontally of the sewer (including maintenance holes and connections); or building/structures, filling/excavation, footings (including bored piers/screw piers) or slabs are to be built over the sewer (including maintenance holes and connections); or driven piles are to be within 10m of a sewer (including maintenance holes and connections). BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 4 of 15

5 The FT-BOS process does not apply to sewers greater than 225 mm in diameter; or pressure sewers that are pumped or vacuum; or where rock bolts/anchors are proposed to be used; or where Council s Development ssessment Branch has required that a BOS assessment be undertaken by Council; or proposed works near trunk sewers, pressure mains and easements for sewers sewers where easements in favour of Council exist (Council recommends that certifiers undertake Title Searches to verify easement locations). Where the FT-BOS process does not apply, the Private Certifier or Registered Professional Engineer involved is to contact Council to clarify assessment procedures. Telephone How to request consent using the FT-BOS process The FT-BOS process involves: completing and lodging Council s Build Over Sewer Part 1 Request for Consent form; assessing the application against Council s Build Over Sewer Part 2 ssessment form, completing the ssessor s Declaration and lodging the form; lodging plans; an RPEQ completing and lodging the RPEQ report where required; and paying the prescribed fees. The assessment of an application should be undertaken against the cceptable Solutions of Council s Build Over Sewer Part 2 ssessment form and this ssessment Manual. This manual provides the technical drawings which accompany the cceptable Solutions. The assessment must be undertaken by a Private Certifier or a Registered Professional Engineer (RPEQ). Note: it is recommended that a site inspection is carried out prior to the assessment being carried out and a Title Search is undertaken to determine easements on the site. Information about completing the forms Completing Part 1 Request for Consent form This form contains general information about the property, the development, and the Private Certifier and Engineer. This form can be completed by any person. Completing Part 2 ssessment form This form contains the assessment requirements, and can only be completed by a licensed Private Certifier or a Registered Professional Engineer (RPEQ certified). For all applications, Certifiers and Engineers must assess the application against each of the cceptable Solutions of the General Provisions. For applications involving piles/piers, swimming pools, retaining walls, filling and excavation, Private Certifiers and Engineers must also assess the application against the cceptable Solutions of the dditional Provisions. Note that the General Provisions and dditional Provisions call up figures in the ssessment Manual applicable at the date of making the Request for Consent and the ssessment must take account of these figures. BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 5 of 15

6 For each acceptable solution, the assessor must tick either MET or N/. The Certifier or Engineer must make the ssessor s Declaration. Council s consent Upon lodgement of a properly made request, Council will stamp a consent stamp on the Build Over Sewer Part 1 Request for Consent form and its duplicate. When stamped, the form (and its duplicate) will constitute the consent of Brisbane City Council under s192 of the Water Supply ct 2008 subject to the following conditions: 1. The sewer must be accurately located on-site by builder/supervisor to determine the size, alignment and depth of sewer prior to building works commencing. 2. Works must be undertaken in accordance with all of the materials comprising the properly made Request for Consent submitted to Council. NOTES: 1. Council s consent is issued in direct reliance upon the ssessor s Declaration in the Build Over Sewer Part 2 ssessment Form. 2. Private Certifier must not issue a Building Development pproval which is inconsistent with the above conditions. Damage to Council s infrastructure ny damage to Council infrastructure should be made safe and immediately reported to Council s Contact Centre on Repairs to Council s infrastructure may only be undertaken with the authority of Brisbane Water. Council reserves the right to pursue recovery action against any persons with respect to repair and related costs incurred by it, including the assessor involved in the assessment process leading to Council s Consent to the works and persons involved in the on-site works. BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 6 of 15

7 PRT B TECHNICL DRWINGS BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 7 of 15

8 CCESS Neighbour s property connection Owner s property connection 1m x 1m removable slab 1m x 1m removable slab Property line DRIVEWY KERB & CHNNEL Sewer FIGURE 1 ccess to sewer connection in driveway BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 8 of 15

9 FOOTINGS Finished ground level Pad or strip footing (Does not require bridging unless the load bearing stability of the footing is still affected by the sewer trench) **Note if footing is located within clearance zone (ie closer than 600mm from centre of sewer), bridging is required Min 600mm Min 300mm Pad footing only (Can not be located closer than 300mm from sewer) FIGURE 2 Clearances for pad and strip footings LEGEND Clear area Sewer Footing BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 9 of 15

10 BRIDGING examples = min 300mm = min 300mm FIGURE 2B Examples of bridging LEGEND Clearance from sewer Sewer Footing BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 10 of 15

11 BRIDGING example Finished ground level Min 2m Depth of footing to be determined by Engineer (usually same as standard footing) min 300mm = min 400mm Not normally greater than 1.2m FIGURE 2C Example of shallow bridging LEGEND Sewer Footing Sewer trench BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 11 of 15

12 BRIDGING example Standard strip footing arrangement Footings located over sewer Footings located over sewer trench 1m min 1m min 2m min 1m min Width (and depth and spacing) determined by engineer. NOTE: Strip footing arrangement (including bridging beams) to be designed by engineer FIGURE 2D Example of bridging beam arrangement BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 12 of 15

13 BRIDGING examples B = 1200mm B = 400mm NOTES: B Hand excavated or backhoe excavated piers must be 300mm clear of sewer Bored piers must be 1m clear of sewer Plan view FIGURE 2E Example of bridging beam arrangement B B = 1200mm B = 400mm Plan view This footing section is clear of sewer trench and does not require bridging (unless the load bearing stability of the footings is still affected by the sewer trench) FIGURE 2F Example of bridging beam arrangement LEGEND Sewer Trench Solid ground Strengthened footing Bridging Beams (with REO heavily tied into strip footing) Proposed structure BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 13 of 15

14 RETINING WLLS 600m 600m Plan view Retaining wall Owner s sewer connection FIGURE 3 Clearance requirements where wall is built over owner s sewer connection LEGEND Clear area Footing BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 14 of 15

15 EXCVTIONS Clearance above sewer = 1m for all lots OR 600mm for single residential lots Finished ground level 1m 1m Clearance below sewer Excavation taken below the level of the sewer is at least 1m horizontally clear of the sewer FIGURE 4 Clearances for excavations LEGEND Clearance from sewer Sewer BRISBNE CITY COUNCIL BOS ssessment Manual Version 01/2007 Page 15 of 15