Design levels from KSA 6997-KSA-03-XX-DR-C-0001 S4-G · to be updated to as-built at handover
CCG
IMPERIAL FIELDS – RESIDENTIAL BLOCK
Drainage chamber record · Bishopsford Road, Morden SM4 6BF
SURFACE WATER
S3.16
Precast concrete manhole 1200 dia with catchpit (silt sump)
⚠ CONFINED SPACE – NO ENTRY WITHOUT PERMITPermit to work · gas monitor · trained operatives · top-man & rescue plan. Most tasks can be done from the surface.

Key data · levels: design (KSA S4-G)

Cover level20.450
Invert level19.125
Depth1.325 m
Chamber1200 Ø
Pipe225 Ø
Cover classD400
NoteCatchpit - sump level not shown on dwg (depth = to invert) - confirm with KSA

Section through chamber

D400 coverID platecatchpit sump – siltINOUT 225ØCL 20.450IL 19.1251.325 mIllustrative, not to scale · 1200 Ø precast concrete rings · levels in m (drawing datum)

Where it is

Location of S3.16
Extract of KSA drainage layout – S3.16 circled red.

Inspection & maintenance

Carried out byAppointed third-party maintenance team
  1. Every 6 months and after heavy storms: inspect from the surface; measure silt depth in the sump.
  2. Remove silt by vac tanker when the sump is about 1/3 full – before silt reaches the outlet.
  3. Check the outlet pipe is clear; jet if flow is slow.
  4. Record every visit in the log below (date, name, findings, action) with photos.

CCTV survey

Report refTo be completed at handover
Survey date—
Video—

Handover record – where CCG finished

Practical CompletionTo be completed at handover
Defects period endsTo be completed at handover
Handover inspectionTo be completed at handover
Condition at handoverTo be completed at handover
Silt at handover—
As-built levels verifiedTo be completed at handover
ID plate fittedTo be completed at handover

Inspection log

DateBy (company / name)Silt / conditionAction takenNext due