ST8807-CS 880210COPPELL PUBLIC WORKS
MEMORANDUM
February 9, 1988
TO:
FROM:
RE:
Steven Morton, Chief of Land Development
Richard Diano, Park Foreman
Line Lowering - 16" cylinder pipe @ Freeport/Bethel
My comments are as follows:
1) An off-limits zone of 20' is to be established around the
existing Cedar Elm (Ulmus Crassifola) that is found near the area
to be excavated. Encroachment within this 20' zone will be moni-
tored and should it occur, the contractor will be responsible for
any and all damage to the tree. If considerable damage occurs
a replacement tree shall be acquired at contractors expense, trans-
planted, and a one year warranty be given the city.
2) Due to the considerable disruption of traffic in this area
it is recommended that the truck traffic currently parking, standing
along Burns St. be relocated to Hammond. Both Home Interiors and
Minyards should be notified and asked to limit the parking/storage
of vehicles along Southwestern during this detour.
RED/bb
Street Department - Per Birdsall
COMMENTS - Freeport Line Lowering
Will the single 10 x 5 storm drainage culvert suffice the
drainage until others can construct the other 10 x 5?
What is the drainage impact on the small crossing on Bethel
just west of Coppell road?
3. Why tear up the road and driveways twice for storm drainage?
o
Drawing of storm drainage does not reflect the other 10 x 5
in the last drawing and incorrectly shows it in the elevation
(same page).
5. Need detour plan for two-way traffic during actual line lowering.
o
Type III barricades need at Freeport and Bethel instead of
Type II.
"Detour Ends" sign at Southwestern and Freeport cannot be in-
stalled in proposed location due to obstructions. Recommend
to locate sign on west side of Freeport opposite Southwestern.
Will open ditch on Bethel Rd. remain full length to city limits?
If so, the Y inlet at Freeport will not support the drainage.
9. Where will the overflow point be if drainage exceeds capacity?
10. Increased traffic will have adverse effects on the asphalt
pavements recommended in the detour plan. Increased maintenance
is inevitable. Who will maintain?
DISiN 'FECTION
Three ways to disinfect on new or repaLred mair~:
50 mg/1 at 24 hour contact tLme.
#2 500 mg/1 at 30 minutes contact ti.me.
Insert the hyp_ochlorite granular in great ~.mounts into pipe during construc-
tion. On initial fill-up of line, run water slowly to create good mix with
hypochlorite. After ..main is full, flush all remaining graulars out then dose
line with a chlorine residual of 100 rog/1 with a contact time of three hobs.
After disinfection process is complete and remain residuals are flushed out,
main slnou!d be filled with water that is transported no._.~nm~, lly.
Then catch bacteriological sample. Results of test must be "Negative" in
order to put main into service, no matter what the circumstances may be.
There is also so,we concern as to dumping chlorinated water directly into creek
or stream. I suggest for high chlorine residuals tb~t are flushed, mmybe use
"Sodi%~m Thiosu!Dhate" to remove chlorine as water is being flushed.