HomeMy WebLinkAboutCT 83-04; WINDSONG SHORES PHASE 1; SITE GRADING PLAN EROSION CONTROL STUDY; 1989-08-01WIND SONG SHORES
(C.T. 83-4)
SITE GRADING PLAN
EROSION CONTROL STUDY
August, 1989
J.N. 300-2
Revised: August 23, 1989
PREP ARED FQJ':{:;
CROSBY MEAD BENTON & ASSOCIATES
5966 LA PLACE COURT
SUITE 170
CARLSBAD, CALIFORNIA 92008
(619) 438-1210
BY:
~L!/JI-~h Kim L. P 0 s-t---R-.-C-.-E~.---L2-3-'1'-6-6
Exp • 12/31/8 9
REFERENCE:
WINDSONG SHORES (CT 83-4)
SEDIMENT CONTROL CALCULATIONS
Job No. 300-2
August 1989
Page I o,f 10 ,-,--,-,
~rosion & Sediment Control Handbook, Goldman, et al.,
1986, Chapter 5
Using the Universal Soil Loss Equation (USLE) to estimate the average
annual soil loss from the graded areas of the project site (i.e.,
garage excavation areas), the sediment control devices around eacb
inlet are sized to accept and retain the entire estimated annual l~s~.
Since each inlet is located within a flat (1%) pad area, the soil
losses from the 4 or 5% sloping pads will ordinarily be deposited at
the transition area to the 1% pad and,not be carried to the inlet
location. This and other factors will result in a conservative, over
designed sediment control system to assure the potential sediment is
controlled.
After review of the grading plan, a "worst case" tributary area has
been established and sediment volume calculations will be ~ade for
that area. By inspection,of the tributary areas on the encilosed
grading plans (reduced), tHe largest basin also contains the most
"sloping pad" areas and will result in the greatest "soil loss"
volume. Sizing of sediment control devices for all inlets based on
this largest/steepest area will result in adequate capacity fo~ all
cases.
Job No. 300-2
August 1~89
Page ~ of 10
Since the temporary slopes will be covered with plastic to prevent
their erosion, the areas and pad slopes in the calculqtions are
limited to the excavated garage pads.
Existing areas lying between the garage excavation and the top of
bluff will be controlled by bladed swales and inlets" backed tlP by
straw bales along the bluff top, so have not been separately
calculated.
•.. ,I,
, ' , I
;i
. "
, ,
", ,
..
.. - --
Windsong Shores
Erosion Cont~ol Study
Job No. 300-2
August 1989
Page 2 of }O ,
it !t ';
Windsong Shores
Erosion Control Study
Job No. 300-2
August 1989
Page 3.-of /·0
;: ~Ji!~ ~' c:;{rvtf~~-~"
_----=---;-:! -'---_-----,~JtM~ h3 . ~ ~,zl ., ,
i , ,
i
I ;1 ,
A-= ~'( k: 'K L 51' Cf'.? ~
:24(7'4 0120 1-1-S i: ! () 1\ t3 ~ ~.'tZZ 1->
~ .
:.. ~.P r-· L=-'10 ~d-s4~ A::a~A
.• ----______ i~ __ . ___ . ______ ~ ______ .. K-k~--OoL Z ________ CTaJ!k_~·~S )'----~-
_--H--__ .~e,LfZ~)(o11 z)c rL 77~ffN;~~Tf: .
;j
i
I
., .. ~.. .
Windsong Shores .
Erosion Control Study
Job No. 300-2
August 1989
Page £ of /0
.,
.' .~. . .. jj::
..' ~'. ~~ :: "~". .' .~. ..~ . .' t·,·
_____ .. _. _____ ~ __ ._. 1_ • ...:........ __ • __ ••• -, .... ___ ":,,,,.:,,
Windsong Shores
Erosion Contro,l Stlldy
Job No. 300-2
,August 19.89
Page ~ of 10.
11 ::; ==(;I;)p,/Z'jj;,I/)~ tZ-Ji crJt~
'! :i
______ iJ __ QtPt!~£~ L -=:. WI ..5 ~ f % d ~ OJ zs&-.
il j( ~ 0; 3 7
__ ~! .A= ~ 2~ 3ff~ _____ ~----,-....,.--_____
. ' ..
---. ___ s---\"-U~:t-/--f-/z)~? /{is] .... 0; 3Z ?~ •
j! .....
--;..,., ,---------------:---"--'------,.---'------"-----,... . . " _:~ _____ 2-:5 :== a68CpJe~.Ci:.1-___=___-_,__:· '" .
. ' --~~--.. -.-.. --,---
~ :
d !j :1 ;, .,
L if ---~:----------------------------------~---~ ~ .,
.j
;i-------
i: .. . ------~.+~--. '----------"'-:
. '!
.
!!
!I -.. -----~+--.-.. ----
i! .J q -. _._ ... ...,-_. ---Ii
II"
II· . .::~ .
,' .... > '. "
'8£101 '1'~~ S Rlf,BAJ Windsong Shores ~ .Je&.~~J") Erosion Control Study ;, 1""""" Job No. 300-2
August 1989
Page l of M
----~~~~~~~~-~~~~~\.~--------~--~
"
i "
, .;
:!
:
'I
,;
-
~ ,
, ,"
--+-:-:, ------"'i!~~a --=..l3d ...... _~ ¥-i~-1{/e~~ .. >
__ ,----,-'_' -----r-A.L..f, 1_:::_°' ~(i'J =--(J, i~ sf..
" , -~" -----.~-.::=--... p~-:;..-rr:~i!-~---7T-Z""'""7L;"'--Z---l,)r-=-~-;:-, 7-1-, --~", ----' :::,>.";
V :::= A l :: CO,gS){3 7 7) ~ 32 cL ______
"
--',
Windsong Shores
Erosion Control Study
Job No. 300-2
August 1989
Page _7 of-.l.Q
.-"-c--n' J •. --~-P~t· K-'--'--'
i
, I
: ~L~~~_~~~-.\~---------', .. -.
-~=~=:~~· __ ==~=-~:~ __ --_~·.--"·~~=_E_ ~ _._~~_~_7TUz1:: "5fr7' .
=-= __ =~ __ --__ :V-_~~-;rC~_(E:r5jZiz7)~ C£ ____ ,
... -- -_. --'--' ----------_ .. ---_. __ . --... _-_. __ .-._-------. ---.. -__________ ~.~ __________________ . -------.. -V-~-.t-j £ .-~~fj~_.;> c?tJ c..a c!i __ ~----
t c t' ..
"f I f
\
c
o [
---__ 09':--
__ ~Or;-
__ -------I
I I
I ..
i.
---, \
\
\
\ \
\
\
.
\ ~
2
i
. -s -J ~
~
52
0
" I ~12--~ ~ ,
I
• .. ••• ,<11 .. ~:: _.-.-' ...
............ ....
l ________ ~ ____ ~~~~~==~~ ______ ~~~~-----------------------------:---<~,--~= '-< , . . , , ,
"
WINDSONG SHORES (C. T . 83-'4 )
SITE GRADING PLAN
EROSION CONTROL
AP~ENDIX
Jol;> No. 300-2
Augus t 19'89
COUNTY OF SAN DIEGO
DEPARTMENT OF SANITATION ~
FLOOD CONTROL
2-Y'EAR G-HOUR PRECI:PITATIOt~
33-'
45 1
30' I r--~'t:-----
+
15' I I\:).
45'
Prep~''';d by
u.s •. DEPARntENT OF COMMERCE
NATIONAL OCEANIC' MID ATMOSPHERIC ADMINISTRATION
SPECIAL STUDIES. BRAN CU. OfFICE OF HYDRO·LOG\". NA'TIONAL WEATHER' SERVlCa
.... ..... ::,.
' ..
N
,30 1 -
1180 '.5 1 30'
Tt··_··_· . I
1St 1170 I
4S' 30 1 IS.' 1'1,6-
(i) I~ ::0
]:!
Z m
en mO
N DC
f11
--4 rJ: ... m
0 -t D
~ mz
:;0
CD i~ c -I tile • 11
0 Z -0 2D
{12 -~ ~
~IC ::e:: o:J ......
):a (X) ::s 0-(X)
N
II) ..
I-' g ,.~
0 ~ ~ N ,. .....,
J
~I g
III m n-et) w :z I 0 .1-' . ,J:lo
I I-' . (XI w (XI
•
BIO@lO'-14'
B4@5.5'
36" IS" 2"
u.s. Standard Sitlves
I" Yz" ~" Hydrometer
(MlnuftlS) ~o 1120 1140 lleo / /
12" 6
L
3" Il-l!·~· ~. ~ *e. -'6 "0 .50 j ~o 11 I 2 5 30 leo 14180 (500 •. J ""J, t t . J' ' ... '. , • f'I. &! . '" . I ., I "r-... '. • · :: "" :1..... I . ::
10~'
. -. -. '-' --.-. ---190
11111 II I I I lit III I' 1:1-I:' till j d i i !,~ -; ~ : ; · i ? _1 __ ._ _~ ••
. . I' .' ~~l--;' /. • " '. 70
80
ac
'70
&...
tt 60 J' 'ill': : :: ::;: : :: .: • , .• ':.. . .. : -'-.:. • I· 2_ S e. __ .;. _leO • ~1O"JI()()GIIJ .'. ,. . '" " r.t-i: r-t: ., ': ,: II)
1ll11rll 11 111'1111'1'1' I:'; i_: ~!:: 1~\1~:_1\~ : :·4/!1 .:J_t-Jt--~!50~"
J :: :", • ;:: i :! : i : : ; • •• • • • , ,'. : '.' ..... 'I> ,'" . Ij\-, ~I . /:. . ; : . i ,:' 40~_~
~ t.: 50 ..... ~40 U '" ct 30
2
10
olli! 1 11 4 3 1000 z
t' otl "~l~ "
.. . " . .. ...:..;; ;" • • 1\.'. • /'.,. ./'. i U ~
..l." • • L~' . '.' ~f-._., 30"'-;:: !.. , . ~ . /' , '" i 1-.• :t-~ ~ · tit:: : : ..... , : !:! :1' [ :! i: (S \-t-I-\--pt.. . . ,~. " _ .. 'f' -.. , _.-=1-20 _ · .. . . ./ ., ....
: :: :: .' :: :1 I : :/ ~ • • •• • • • • ':.l : J 0 l •. J1 . --_. _.t-;--.-. --t-~ -1_. " -t-...... -.. -'71-10 _.~
.'
+ 1·1 .. ·1:-1· ~-l~-t-::-I:
-f-I-:-I:-I-:-I:
6D8186 4 3 I 0 2
I • •. .: . i f i I' : It ~
• • J Ii.
• • 1j8 7 G 5 4 3 2 0 :.. .$81654 3 Z 1$8785 .( 3 10 l. z $1185 • ~
.01 .0 1
t Groin SIZtI (mm) .1
Bl@5.5'
PARTI·CLE SIZE LIMITS ! GRAVEL SAND BOULDER I COBBLES
CC)ar" I ~ ..... , .Medlum I SILT OR CLAY Fln~ F.lnt ~·In.
.. " (12 In.) 3/4 In.
U. S.
No.4 No.1O
STANDARD.
NO.40
SI~VE
No. 200
SIZE
.'
~
ncz, 0·"
.'
0'JJ'l-
Fig.5.6 Triangular nomograph for estimating K value. (6) See Table 5.3 for adjust.,.
ments to K value under certain conditions. .
FROM: Erosion & Sediment Control Handbook, Goldman et aI, 1986