HomeMy WebLinkAboutResposne to Staff Comments Michael G. Hester, P.E.
Hester Engineering Company
7607 Eastmark Drive, Suite 253 -B
College Station, Texas 77840
979 - 693 -1100
mhester @hester- engr.com
May 12, 2011
SPRING CREEK TERRACE PHASE ONE
Case File No. 11- 500070
ENGINEERING COMMENTS NO. 1 Construction Documents
1. Please provide a Letter of Acknowledgment.
SEE ATTACHED
2. Please provide an electrical and signage plan.
ERIC HOR T ON WITH THE CoCS ELECTRICAL DIVISION IS WORKING ON THE ELECTRICAL. PLAN AND
WILL HAVE IT READY LATER THIS WEEK. I WILL MAKE REFERENCE TO THE CoCS ELECTRICAL
PLAN WITH A NOTE TO CONTACT MR. HORTON IN THE CONSTRUCTION PLANS. I WOULD PREFER
NOT TO PUT AN ELECTRICAL PLAN .AN O MY CONSTRUrTION PLANS _ H. I IS NOT MY SPECIALITY.
HAVE INCLUDED SIGN LOCATIONS & BLOCK NUMBERS (AS RECEIVED FROM I`v1AND1 ALFORD) ON
THE PLANS.
3. FYI...AII public infrastructure will need to be installed or surety provided prior to filing of the
final plat.
YES
4. FYI... The Development Permit Fee is 1% of the total public infrastructure costs, not to be
less than $600. This may result in additional development permit fees being due prior to
construction plan approval.
YES
5. Sh.0 — Note #9 should specify SDR 26.
PLEASE SEE PLANS.
6. Sh.0 — FYI... Note #12 indicates all ROWs and easements need to be cleared, however this
is not a City requirement.
YES. THIS 0 DONE TO INSTALL THE ELECTRICAL CONDUIT AND OTHER UTILTIES.
7. Sh.1 — It does not appear that there is a water service line provided to Lots 1 & 2, Block 2.
YES, LOT 1 IS SERVICED FROM THE 12 -INCH ALONG DECATUR AND AN ADDITIONAL WATER
SERVICE `vVAS ADDED TO LOT 2, PLEASE SEE PLANS.
8. Sh.1 — A tee will need to be cut in and a gate valve added on the 12 -inch waterline for the
tie -in at Decatur.
PLEASE SEE PLANS.
9. Sh.1 — The sanitary sewer line needs to be at least 5.5 -ft from the edge of the right -of -way
or else a PUE needs to be dedicated.
' /
1
\ \
YES TO MISS THE STORM SEWER INLET @ ALTIC DRIVE THE SANITARY SEWER WILL REMAIN
i n.-� n r -r PUE BE A ! THE SAME L 0CA ! ION AND A 10-FOOT PUE WILL B E PROVIDED// ON THE LOT SIDE OF THE
ROW & SHOWN ON THE FINAL PLAT.
10. Sh.1 - Please label the flowline of the 4 -inch sanitary sewer service line at the end of the
wye. FYI... At this point, the maximum allowed cover is 3.5-ft.
PLEASE SEE PLAN.
11. Sh.1 - Please label the flowlines of the service leads tying into the manholes at S and S - 3.
PLEASE SEE PL AN.
12. Sh.1 - For HDPE pipe, the design engineer is required to provide a trench detail.
PLEASE SEE SH T 4
13. Sh.1 - Please provide a profile drawing for the storm sewer crossing the street at
Sta.16 +93.
PLEASE SEE SHEET 1
14. Sh.1 - At the storm /water crossing, please provide at least 1 - ft of vertical separation.
WATER LINE LOWERED TO 12 - INCH MIN BELOW STM SWR. PLEASE SEE PLAN.
15. Sh.1 /2 - Please label all proposed deflections with radius of curvature and flowlines every
10'.
ALL DEFLECTIONS ARE MADE UP AT \ V / PI TH PIPE WILL NOT CURVE (ALL ART LESS THAN
LESS THAN 2 DECREES) AND THE DEFLECTION IS S)1-10 VVIN ON TI-LE PLANS.
16. Sh.2 - Please add a gate valve at tee for fire hydrant.
PLEASE
HYDRANT SEE p T
PLAN. /5 THIS P1 VViC. VV /i�L l� UI/ L/V�L /V / !TVIV/ THE WATER 0V/,S /l0l V1 i1 / . V / //
/ / \ 1 \ YDRAN-,FR WILL CAT.3 !,iALlLi .-11.011/' THE /VI1 / /V i \ECAR LLS 1//C WHERE THE rVEx T ✓a L VIE /S. 17. Sh.2 - At the comer of Lot 1, Block 1, the waterline needs to be at least 5.5 from the edge
of the PUE.
t it n r rn �-r rnnn RIGHT WAY in n n � Wm./
O. OFFSET THE EASEMENT 10 -FEET FROM THE RIGH i OF AR��IU� D THE CURVE AND
_ � 5.97-FEET r T-n THE 'WATERLINE. f ir -ri i�r it rr-� r -n �-n THE FINAL n i -r
! IS 5.9 -FEET ! 0 ! HE'WA. I ERLINE. HIS 15 ALSO .ADDED ! 0 HE FINAL PLA ! .
18. Sh.2 - Please move the sanitary sewer service line connection out from under the
pavement.
PLEASE SEE PLAN
19. Sh.2 - Please verify that storm sewer manholes are being provided at least every 300
BOX JI_ BOX
J N .ION WAS ADDEID.
20. Sh.2 - Verify that the 24 - inch pipes were analyzed assuming 25% reduction in capacity.
YES, THE 24-INCH I I\J n n METrn PIPES' HIVE SUFFICIENT CAPACITY .AS SHOWN IN THE
r ter Hf ._ I H 0 r1i it rn 0Ir`�
ATTACHED STORM CAD REPORT
LINE TOTAL SYSTEM FLOVV ICrt31 FULL CAPACI 1 Y (CFS) CAPACITY f//
nn
r -! �1 i.�� 18.26 !.5
P -7 7 ).47 56.0:
P -8 15.41 5562 27
P 6
8.35 11. 7 1.4
ALL 24 -INCH CAPACITIES ARE ABOVE THE 1.25% REQUIREMENT
21. Sh.3 - Please provide an intemal drop manhole at Sta.11 +60.
PLEASE SEE PLANS
22. Sh.4 - Please provide concrete flume per City standard.
YES, I REMOVED MY FLUME DETAIL.
23. Sh.5 — Clearly show where the gravel construction exit will be located.
I /`iM HESITANT TO SPECIFICALLY LOCATE THE GRAVEL CONSTRUCTION EXIT, 1 FEEL iT IS UP
TI r' CONTRACTOR llli n r I 'UPON /I nr SETS EQUIPMENT, O T I
TO - I nE 1.OIV I RAC vR & �ViILL DEPEND ` V`4n -r�� H J TS v v � _
OFFICE. MATERIAL YARD ETC. (ON THE PLANS I HAVE SHOWN THAT ONE IS REQUIRED)
24. Sh.5 — Please revise the "Total Acreage" table.
nn r THE
THIS INFORMATION IS AI SO TO BE PROVIDED BY THE CONTRACTOR. THCONTRACTOR i H. HAS
NOT BEEN CHOSEN YET & I DO NOT KNOW HIS PLAN
25. Sh.5 — The silt fence should be pulled out of the drainage way to prevent blocking the flow of
water.
I DO NOT FEEL THIS `WILL IMPEDE THE FLOW ALONG SPRING CREEK IRE A THE FENCE I S s /
THE 100 -YEAR Fl OW LEVEL. AND1 \WITH REGARD 1 T 0 I HE SITE I FEEL IT I1 IMPORTANT TO
L EAVE IT AT THIS LOCATION TO CAPTURE THE SEDIMENT COMING FROM THE SITE DURING
T i-IF lrTnl IrTI I TIl /)T IT 1 n 11 1 nrI'll 11nr i n'n ITrn 1 n n nV r Tn r- -r,mn
\_IIV7 hall_ Il_ V ' .1_ LVI f II_ ). 1 I VV.I I Krl ^ iUIK[ I / - i I\J I �LVHIV\_[ Y�Y THE L._/I 1 K ,l_ Ll r;
DURING THE CONSTRUCTION].
26. Sh.5 — Please revise the title of the sheet to indicate "Erosion Control" rather than SWPPP.
PLEASE SEE SHEET.
27. Sh.5 — Please provide a grading plan for each lot indicating what the ultimate drainage
patterns that the home builders should adhere to.
PLEASE SEE GRADING PLAN
28. Water Report — The fire flow analysis needs to include a scenario with fire flow plus peak
daily flow.
YES. IN THE REPORT "F HE BASE FLOW DEIViAi IS INCLUDED IN TIRE rl r f_I 111 nl EASE J Ir IN nnr = r wvc fI rHcr rr E
F i wiTH A RASE FL Cl \il/ OF 185 GPM AND JiUNCTi0N J -6 \.WITH A DEMAND OF 13.3 % GPM
DAILY FLOW n n n E D O n , \ n
THIS 1 S IS HE IV AXIIVIU VI l�nr BASD ON n. j u GP A PEP ni AT THE SPECIFIC
JUNCTION OR ERE HYI //RANI T , THIS IS ADDED TO THE FIRE FLOW DEMAND IN THE ANALYSIS
29. Water Report — Please provide velocities within each segment of the pipe with all scenarios.
IV I/n - 1 X MUM FIRE DEI�VVIAI`VD IS 100J0 GAL / IVIII`V t 1 EACH 1 FIRE I -- J\1 DRA
- Velocity of 8-inch line. 0_ n r d \'_0 ; n n -
_,, ,
clvu 'v v III Imo, -r\v and V- r\ & r� °III\
n - (4 nn , 1 /r, (
i '1ZZ-J f /r. 1131 /60 1 - ')Z f : C 5 ) EEC
'3 - 1 IJVJ1J -.C I Il I 03/ LI 4 0/
il 1 111111 101 sec) '- �.cJ LI / JCL _ •O.JG FPS
n
3.14' (n 3 3 n 7 /1 Lt's
Y5 t ..J _7 lJ 3'4 I G
- TI1E VELOCITY OF 8 -INCH LINE C 1000 GPM. - 6.3/ FT /SEC `J'VI ITCH IS BELOW THE 10 FPS
CONSTRAINT
-THE VELOCITIES nil'
THE BASF- -LOW DEMAND ARE SHOWN IN THE PIPE REPORT AND ARE
�i n Tr MINOR
OUI f E IINOR
30. Sanitary Sewer Report — The "Brief Description" references 12 LF of 8 -inch waterline.
Please revise.
YES THIS'VVAS CORRECTED TO A DINE LENGTFI OF 1,370 LINEAR FEET OF °SANITARY SEWER"
LINE. PLEASE SEE ATTACHED REPORT
31. Cost Estimate — Under "Pavement," we do not require easements to be cleared and
grubbed.
THE EASEMENTS ARE CLEARED FOR THE ELECTRICAL CONDUIT INS T ALI T ION.
32. Cost Estimate — Why is the waterline quantity different from that indicated in the report.
FEET � �r r n ir nir�
THE 1315 LINEAR FEET IN THE REPORT IS FOR THE EXISTING 1 % -INC H LINE ALONG DECATUR
TO THE iT THAT n ri n i r r- THE nnr.
THIS LINE GOES I O THE EXISTING FIRE HYi RAN I HA I WAS FLO`r1i TESTED, THE PROPOSED
e i T- ni Ir FOR SPRING CREEK TERRACE n r i n�1 � LINEAR FEET OF n i �r i
VvA.1 ER INE FOR SPRING CREEK ! ERRACE IS 1497 LINEAR FEE I OF 8 -INCH
33. Drainage Report — Please verify that all applicable methodology enumerated in Section VB
of the BCS Stormwater Design Guidelines was utilized.
YES PLEASE SEE LETTER OF ACKNOWLEDGMENT,. ATTACHED
34. Drainage Report — Please verify that the detention pond was modeled accounting for
floodplain backwater conditions.
YES, THE 0100 1rVATER S E�
SURFACE LL'ATIUN IN THE BASIN IS L77 1
. . THE 0100 WATER
SURFACE FLE \r'ATi0N FOR THE SPRING CREEK TRIP A F- O0DPL ,A!Ni IS 275 8 DUE TO THE 3,3-
FEET DIFFERENCE IN HEAD THE BASIN WILL Fi_INCTi0N PROPER1 y wi T Hi THE TAii_'WATER
EROPv1 SPRING CREEK, THE BASIN WILL_ TAKE LONGER TO DRAIN OUT
Reviewed by: Erika Bridges Date: 5/9/11
ADDITIONAL REVISIONS TO THE ORIGINAL PLANS
f\ THE DETENTION 1 I T/1
I CHANG I HrE 0UTFAi L OF THE �E EN ION BASIN I O INCLUDE A CONCRETE
O i r n STRUCTURE, Ir I m TI nr nrIn r mnr nENT MA-1. IT Mr1 \111 HAS r n nr-
UU rr\ _L 3 1 RULTLJI�L Rlr- Rhn P I ur\r ICLn 'JrUICLEI\iILIV 1 I I IvvVV nA3 r, 20.>-
FOOTFOO nnrin OUT n TI Ir nnc� rr nrTn11 SHEET n
1 iJICUr' JLJ 1 OF nL. Dr- ,3II� SEE L)L I r\IL DnL�_ 1 '4
ATTACHMENTS:
-LETTER OF ACKNOWLEDGEMENT
-STORM SEWER SYSTEM ANN '61S
-SARI) T AR SEWER SYST iii EN INiEERING i ESII i � REPORT
Y E,.I t. � IV CR T
- FINAL PLAT 1 17
-ENGINEERS ESTIMATE
- ENGINErERS