HomeMy WebLinkAboutCT 02-16; ROBERTSON RANCH EAST VILLAGE; TRENCHING CALCULATION FINDINGS; 2008-04-10C ON S U L T A/NT S
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Civil Engineering • Surveying RECEIV
4-
April 10,2008
J.N.011014-1
Y OF
I 2008 :
Mr. The McMahon : I Et
Construction Inspector j
City of Carlsbad V
5950 El. Camino Real :
Carlsbad, CA 92008 V
Dear Mr. McMahon:.
JI .. V
' Please see the enclosed exhibit for reference. Based on trenching calculations and field surveys
performed by O'Day Consultants on 3/4/08 through 3/6/08, 3/12/08 and 4/4/08, the following
V V table summarizes my findings: V
V
V Basin
V,
Actual Volume
(CF) V
Approximate Additional Volume
When Storm Drain Trench is
Opened (CF) (1)
V V 2 53,190(2) V , 25,076
3. : 23,409(3) . 7,680
4 45,819 V 8,269
5 :. 34,182 45,499
(1) Volume of trench based on SDRSD D-60
(2) Assumes emergency spillway will be raised Y2 foot to 'elevation = 102.47
V (3) Assumes standpipe rim elevation to be raised 1 foot to elevation = 87.6
V V Note: Spoils from trenching must be removed from basin'when chance of rain exceeds 40%
V V and once storm drain trench is backfilled (so. that the actual volume will be maintained at a
V V• minimum.)
T___ S
Si.,.
GO/kr
cc: Don Mitchell
Greg McDonnel
N:\OI IO14\O8O41OMcMahonjtr.doc
O'Day Consultants Inc.
2710 Loki Avenue West, Suite 100
Carlsbad, California 92010-6609
' U
- ry No. 32014
ReJteredCivil EnZer C10-
OFC
E-mail: oday@odayconsultants.com
Website: www.odayconsultants.com
Tel: 760.931.7700 Fax: 760.931.8680
- it • V
very truly yours,
O'DAY CONSULTANTS, INC
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