HomeMy WebLinkAboutStaff Comments ENGINEERING REVIEW (02- 00500245)
COMMENTS No. 1
1. Please show 10 -yr and 100 -yr storm flows for public storm sewer.
2. Please remember, for storm sewers 24" and less there is a 25% reduction in cross
sectional area of the proposed pipe. This can be translated as a design Flow where
Design Flow = 1.33 times the actual flow. If the pipe passes the Design Flow, it
meets the design criteria. The 10 -yr storm can be surcharged in the pipe as slon as
it is 1 -ft below the curb. The 100 -yr storm must remain in the ROW. However,
collector streets must keep one lane open.
3. A hydraulic grade line must be calculated for each pipe and shown on either the
construction drawings or the drainage report.
4. Please specify pipe materials for storm, sanitary and domestic systems.
5. An easement is needed for the sanitary sewer across lot Reserve B.
6. Sheet 6 &7; service taps are not PVC (Note 1).
7. Sheet 7; fire hydrants should be placed at the first or second lot line of a cul -de -sac.
8. Sheet 12; include stabilized construction entrance /exit. Include storm sewer curb
inlet protection. Include erosion control for detention pond outlet.
9. Sheet 13, storm sewer outlet structure should end at property line. Storm sewer
discharge should NOT impact discharge (Q, velocity, etc.) area greater than existing
conditions.
10. Sheet 14; please match storm sewer soffits.
11. Provide street cross section /detail for residential and collector streets.
12. Include note to contractor that areas disturbed on private property MUST be
returned to original or greater condition including re- grading and re- sodding.
13.Where utilities are under pavement or within 5 -ft of pavement, structural fill is
required. Include pipe backfill details if cement - stabilized sand is to be used.
14. Include sidewalk detail.
15. Update Engineer's estimate for infrastructure. Estimate must be sealed and signed
by an engineer.
Reviewed by: Spencer Thompson Date: December 10, 2002
NOTE: Any changes made to the plans, that have not been requested by the City of College Station, must
be explained in your next transmittal letter and "bubbled" on your plans. Any additional changes on these
plans that have not been pointed out to the City of College Station will constitute a completely new review.
Home of Texas A &M University
AUTUMN CHASE (FP) (02- 00500245)
ENGINEERING REVIEW
COMMENTS No. 2
1. Sheet 4 calls out 4 -ft sidewalks. Sidewalks are 6 -ft as shown on Sheet 16.
2. Sheet 5 shows 38.5 -ft radius cul -de -sac. Subdivision regulations require a
40 -ft min. radius.
3. Sheet 6 shows 2 branches on the 12" water main. A valve is required on a
main line when installing a tee, for isolation requirements.
4. Sheet 6 shows an 8" water line crossing north end of Cornell. At that location,
the City water line is 6 ". An 8" branch is not allowed on a 6" main.
5. Sheet 11 needs to show Section E -E' on plan view.
6. Sheet 12 shows 2 drives on Cornell while other sheets show none.
7. Sheet 13 shows storm sewer in PUE.
• PUE is not a Drainage Easement and no easement has been received.
• HDPE is not a permitted material for public lines.
• The storm drain could be private, use HDPE, and not go in the easement
however; the City would need proof of permission from property owners.
The drain would be privately owned and maintained. Is an HOA planned
for Autumn Chase?
8. A couple notes
• Water and sewer laterals are not subject to TCEQ separation distances.
• Handicap ramps at Purdue are not required to wrap around. They could
be straight -on.
9. According to our records this project has never submitted for a Development
Permit. Please submit Development Permit application and infrastructure
inspection fee.
Reviewed by: Spencer Thompson Date: March 25, 2003
NOTE: Any changes made to the plans, that have not been requested by the City of College Station, must
be explained in your next transmittal letter and "bubbled" on your plans. Any additional changes on
these plans that have not been pointed out to the City of College Station will constitute a
completely new review.
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