SUSSEX CONSERVATION DISTRICT
CONSTRUCTION AS-BUILT
SUBMITTAL CHECKLIST
The Sussex Conservation District requires an As-built of the Stormwater Management facility within 60 days of completion.
Submittal Requirements:
____
 As-built survey plan in accordance with the items of this Checklist
____
 Supporting calculations in accordance with the items of this Checklist
____
 A copy of the completed Construction As-Built Survey Submittal Checklist
____
 Pond Construction Checklist completed by the CCR during construction of the basin, if applicable
____
 Geotechnical engineer’s report for core trench / cutoff trench construction, if applicable
 
As-Built Plan Requirements:
____ Plans must be submitted on minimum 24” x 36” sheets
____ Provide a location map on the plan

____

 Provide a north arrow on the plan
The title block must include:
____
 Project name indicating “as-built” in the plan title
____
 Name, address, telephone and fax numbers of the individual preparing the plan
____
 Scale of plan (maximum plan scale accepted will be 1”=50’)
____ Date of the survey
____ Hundred, County, and State
____ Signature and seal of Delaware Registered Professional Engineer or Professional Land Surveyor
____ Name, address, telephone and fax numbers of the party responsible for maintenance of the stormwater facility (i.e. owner or maintenance corporation representative)
Delineate and properly label the following (as applicable):
____ Roads adjoining the stormwater facility
____ Property lines adjacent to the stormwater facility
____ Easements (i.e. drainage, utility, access, etc.) adjacent to the stormwater facility
____ Maintenance access to and around the stormwater facility
____ Maintenance set aside area location and dimensions
Provide the following as it relates to the stormwater facility’s storage volume:
____ As-built contours of the stormwater management facility including forebays, micropools, and elevations below permanent pool at 1- or 2-foot intervals based on the datum of the approved plan. (One-foot contours will generally be expected for projects located in Kent and Sussex Counties. For sites with greater elevation differences (+20’ across the site) such as is often found in New Castle County, 2-foot contours will be accepted.)
____ Pond bottom elevations on a fifty-foot grid with high and low points noted
____ Lowest top of bank elevation at fill for embankment/combination pond or lowest top of bank elevation for excavated pond. The acceptable top of bank elevation may be no lower than the design elevation for top of bank.
____ Actual cross section showing elevations, inside slopes, benching, top width and backslope, as applicable (to scale).
____ Elevation of permanent pool.
  Calculations of the volume of the pond as constructed with incremental storage and cumulative storage volumes in cubic feet for each one-foot elevation contour. ***The allowable variance from the design volume of the basin is ten percent.
Provide the following information related to the inlet and outlet structures within the stormwater facility. ***The allowable variance for invert elevations on any structure
is 0.1 ft:
____ Diameter and material of all inlet and outlet pipes
  Invert elevations of all inlet and outlet pipes
____ Dimensions (length, width, depth, d50) for all areas of rock outlet protection
____ Dimensions and material of outfall structures
____ Profile through principal spillway showing inverts and dimensions of all pipes, weirs, orifices, risers
and other appurtenances, as applicable (to scale)
____ Cross-section of emergency spillway (to scale)
____ Profile through emergency spillway (to scale)
***When the allowable variances are exceeded for either stormwater facility volume or outlet structure invert elevations, supplemental calculations must be submitted to determine if the stormwater facility, as constructed, meets the design requirements. Submit the following:
____ Calculations of outflow from the stormwater management facility for all design storms. Routing computations must be based on the as-built volumes and elevations for the facility.