1991-1033 C/G/H/R/T/UStreet Address
Category
/ <J - 5.3 (6 R
Plan ck. #
Serial #
Description
Year
recdescv
Z of4
C7
•
- :r. cl:z
c I Q ( ME'(k o • U
L-
C= 0.10 (
— IVER M EF-'fr4G Dt4 1(4 -90 W iTA 'f iii I)AI'GE
62t6 � - 5 (E ' Co4
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c04�i'(Iok1S, �k RLLE� f'� I�i2ovEME•I'I5 Foil
WA I� AGE WILL` 16 E ' IfZE
— A izP-A ry (-) 6 o o) = 15�ao0 F-,
�._
100 FT
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2 ='I,dd'P�D'
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39-x► riyakL - II'VYvS f 20r\ Qy 3Q —
San 5v - a = C ZI. U,
- a92J -V VSld, XW& Z
- 36
•
�jo s
D.A
v
D. v
0.1
0
�t
p �ic�s Vou+M4 -m s-wrtE = 4, -A,
to
�-10 quo A Ll Vo2 M -P r : lk C I Do) : G o pr
o F �o % = I . (s0)
II
�l
TABLE 2 .
y
RUNOFF COEFFICIENTS (RATIONAL METHOD)
DEVELOPED AREAS (URBAN) Coefficient C
Sall Group (1)
Land Use
A 8 C 0
Residential:
-Single Family .40 .45 .50 .55
Multi -Units .45 .50 .60 .70 ;
Mobile homes . ..50 .55 ..65
Rural (lots greater than 1/2 acre) .30 ..35 .40 .45
C ( . 70 .75 .80 .85
80% Impervious
Industrial ( . 80 .85 .90 .95
90% Impervious
NOTES:
Soil* Group mans are available at the offices of the Department of Public Korks.
( actual conditions. deviate significantly from the tabulated impervious-
ness values of 80% or 90%. the values given for coefficient C, may be revised
by multiplying 80% or 90% by the ratio of actual imperviousness to the
tabulated imperviousness. However. in no case shall the final coefficient
be less than 0.50. For example : - Consider commercial property on D soil. group.
Actual imperviousness 501%
Tabulated imperviousness an
Revised C • 8O0 x 0.85 • 0.53 ••• .
. ..
. IV -A -9
APPENDIX IX -8
Rev. S /81
INTENSITY- DUAATIoN DESIGN CHART
t
L . '-
s .
s%z -
4o
C
•
*1tf�tl�Tfi�ul.���� -••� mT,n�.nn-. . . I i 1.iu.1L►1•r1iriiltii�i Directions for Application:
Equation: I •�■ 7.44 p p' - ' 645
. 1) From precipitation gaps determine 6 hr. and
�11 ^ I Intensity (In. /Hr.) 24 hr. amounts for the selected frequency.
�L. These maps are printed in the County Hydrology
P 6 Hr. Precipitation (in.) Manual 10 50 rind 100 yr. maps included in the
D • Duration Win.) Design and Procedure Manual).
,, �;; 2) AdJust 6 hr. precipitation (if necessary) so
I� ,,, i ,� �III� ! ili I �i� ;�:; that it is within the range of 45% to 65% of
the 24 hr. precipitation. (tot applicable
to Desert)
I �, ., �,�• �) I i;l I; ���,,�1. I ( t I,!�; ; 4 3) Plot 6 hr, precipitation on the right side
of the chart.
a ..�.• \ i 1, � � III ; � `��1; I ' , . ,l�j'� � i � � i •' •� � -+ .
4) Draw a line through the point parallel to the
plotted lines.
t II'� •;:, • I�, 0. I I ! , I I ,:'!, rt 5) This line is the intensity- duration curve for
; - -�•-�- - - - I !� '•,.,�� t ' I 1 ' ! ! ` 6.0 the 1 ocation being analyzed.
� 1 .��II1!' I,� • ! I� i .
4.0 M' . Application Form:
0) Selected Frequency 1 yr.
_ • _ I .,
. .... _t ' I I ' ill 1) P = t,� in.. P = 4•o *P = / %*
- - - ..
U �, III (�'�u 5 6
It N.
x
=7::
..,. _
A 10 15 20 30 40 50 1
Minutes _ -.
- -. -
''2.0
' I
N
111,
P 24
2) AdJusted *P in.
3) t = min.
4) I = in /hr.
*Not Applicable to Desert Region
APPENDIX XI
IV -A -14
Revised 1 /8S
2 3 4 5 6
Hours
r
� I
COUNTY OF' SAN .DIEGO
DEPARTMENT OF SANITATION L 9 00 R G - � O `;••� P,RECI ITATI�('� '
FLOOD CONTROL i^, l,D r' i t� i �.r
s . ' 1SOPI UVIALS OF 100 -YEAR 6 -11OUR
�'I:1:C11=1 i ��710�1 IN — ENTI'iS OF ANN H -TH
45 T .50. �� ......... �.� nl ...�.��..�� \�� I \t V)
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I SAN CI ►►ELATE ` f �f� \�. �• (��• \ -\ \`.
5 �
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• 15
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25
3� 3
33' 30 IONA ,( �!O :>
)EL MAR
2� a s ,�i � rl
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45 1 7 a L Mom
a '
Prop ,I by
U.S. DEPARTSIEN C OF COMMERCE
N ATIONAL OCRANIC AND AT? Ofr11tRIC ADMI:IISTRAT1O11 ��� 1,. JAI.-U 'A•
`'� i• ...dli
•PtC1AL MOM MOM RRANCN p 1tR
.01 /ICR 01 11 ROLOOY. NATIONAL •tAT1 RRRVICt 0 j SAI .n -
3 01 20 U�VJ535 J03 30
118 .45 30 15 117• 1 1 5 1 30 15 116'
FIF
COUNTY SAN SICO
DEPARTM OF SA 100-YEAR 24-1.10111 PRECIPITATION
b,
FLOOD CONTROL .
''10./ISGPLUVlALS OF 100 -YEAR 24 -HOUR
PRECIPITATION IN IVITHS AN I«CH 451 _
• 100 �t�f'E S4� J e 04C1
ti �� •:
uc u o ,c180 ( ,.• y SAU , GO ido IaICC.
— SAM Ct MENIE ' O � v \ -�••_ � _ %
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80 . f
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U.S. OEPARTAmm r OF COMMERCE ' 70', f c� .•CUL - 14
MAT10NA1. OCKA?/IC ANO ATc Ottl•11lNIC AOt,11MIfTNAT10N .O
SPSCIAL iTVOIIA rKAMC11.OVVICK OF 11' OIIOI.OGY, NATl11NA{, rt1AT112A 1CRVIC! $A �• i u�807OV J, 0 �10 G GO �JO
30'
�. Ills' rt,1 3O1 I .1 117' f1, 10 1, I1�'
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BARRY AND ASSOCIATES
GEOTECHNICAL ENGINEERING
P.O. Box 348
Encinitas, CA 92023-M48,
(619) 763 -9940
February 21, 1991
Q
Mr. Dan Walters
c/o Varond Hofmann Design Group
614 Fifth Avenue, Suite H
San Diego, CA 92101
Subject: DRAINAGE INFILTRATION
Proposed Duplex
2324 Oxford Avenue
Cardiff, California
Reference: PRELIMINARY GEOTECHNICAL.INVESTIGATION
Proposed Duplex
Lots 7 and 8, Block 14, Map No. 1298
2324 Oxford Avenue
Cardiff, California
Prepared by A.R. Barry and Associates
Dated October S, 1990
Dear Mr. Walters,
The grading plans prepared by Logan Engineering have been
reviewed by this office in regards to the proposed drainage
infiltration pits. As per our conversations with Mr. Douglas
Logan, the transfer of site drainage to an adequate location is
not feasible. Therefore, the use of seepage pits will be
required. The purpose of these pits is to collect on -site
drainage and allow it to infiltrate into the underlying earth
deposits.
in order to evaluate the feasibility of the proposed seepage
pits, three 6.0 inch diameter borings were drilled at depth of
4.0, 6.0 and 9.0 feet. These borings were tested for percolation
7a •,a t7APP 'bA O L S31dIOOSSd B 188US - 8 - d W08J 02:ST 166T- ZZ -H33
•
0
ME
February 21, 1991
W.O. # P -1 198 -A
Page 2
rates at various levels.
GEOTECHNXCAL CONDITIONS
As indicated in our preliminary geotechnical report, the site is
underlain by sedimentary units consisting of brown sandy
claystone, pale green clayey sandstone and tan to brown
sandstone. These sedimentary units were not deposited in
horizontal layers. They are composed of lenses and
intertongueing deposits of different rock types. Because of the
different lithologies on the site, considerable variation in
percolation rates were obtained. In general, the claystone and
clayey sandstone have poor percolation rates ranging from 60
minutes per inch to over 100 minutes per inch. The sandstone
unit encountered at 8.0 to 9.0 feet reflected moderate
percolation rates of 40 to 50 minutes per inch.
CONCLUSIONS AND RECOMMENDATIONS
•
1. The site is generally underlain by sedimentary units which
exhibit poor to moderate percolation rates. In designing
such a system, consideration for lateral migration
(westward) of infiltrated water should be considered.
2. In view of the poor percolation rates in the upper clayey
deposits and the possibility of lateral migration, it is
recommended that the pits be excavated into the more sandy
20 b6682b6
01 S31UI00SSU T Addus 'H*u WOad I2:9Z Z66i- ZZ -93d
V0 • d luioi
n
"1i
February 21, 1991
W.O. # P- 1198 -A
Page 3
deposits encountered at an approximate depth of 9.0 feet.
•
3. Because of the variation in rock types, a representative of
this firm should be present during the excavation of these
pits. The intent is to locate the base of the pits well
• into the sandy deposits. The exact depth may vary and
should be determined during construction.
If you have any questions, please do not hesitate to contact us
at (619) 753 -9940.
This opportunity to be of service is greatly appreciated.
Sincerely,
A. R. BARRY AND ASSOCIATES
Mark Burwell
Geologist
A. Barry, P. E.
Principal Engineer
C 27US
•
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pi E5ENCH IN O t I P Or R 1 ANN NG OR r �-- tXlS �.
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4. V AININO WALL WITHIN HIN 5001 PRIM - o_ 100 HOU5C5 _A NO S ,
r n C�X151. r �
P 1HG5 AN5 t0 15b PERM 1 �, C NytR(�C C W 11 f�
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. TO BE E
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OF R151 ALLE-V � � � 138 1, c-
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I APPROVED EQU/I/!�L EM TD BE /STgLCEO
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PDRIZONTAL 51 lQNpSfpPG AR��
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75 ! PAP: �� �0�� 4" PVC. DP�'(N PIPG 200 o MAN • �� ��� TOPS OF ALL SLOPES TO BE D /
� 2. KED dR
C �- I TRENCN�p TO PREVENT WATER FROM
5CC
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REVISIONS APPROVED DATE REFERENCES DATE BENCH MARK SCALE DESIGNED MA �Y CH BY
SPECIAL DISTRICT APPROVALS CITY of ENCINITAS PUBLIC - WORKS DEPARTMENT DRAWING N0. LJ Q
IN comc. momumemT 2 PLANS UNDER SUPERVISION OF RECOMMENDED APPROVED GRADING PLANS CO�
Qee Nq 90- I(v4 02 9-0-90 WEST OF 5AN ELIJ0 ON 5DUT CURB
HORIZONTAL I -• � � ,A� DATE BY: BY: _
LINE OF LIVERPOOL
R.C.E. NO: 39706
VERTICAL N/4 DATE: DATE: -
ELEV. =. M D�cfUM : M.g.�,
p0IjGl. S E L F'N EXP. 12-31' 93 WORK PROJECT NO. SHEET 2 OF Z