HomeMy WebLinkAboutCDP 2018-0002; MINICILLI ADDITION; UPDATE OF LIMITED SOIL INVESTIGATION REPORT; 2016-06-09-. '
ALLIED EARTH TECHNOLOG)'-
191s SILVERTON AVENUE, SUITE 317
SAN DIEGO, CALIFORNIA 92126
PH. (858) 586-1665 FAX (858) 586-1650
(619)447-4747
ROBERT CHAN, P.E.
June 9, 2016
Diversified Cor,struction, Inc.
1745 E. Vista Way #10
Vista. CA. 92084
Subject :
Gentlemen:
Project No. 09-l 106G6
Update of Limited Soil [nvestigation Report
Proposed Granny Flat Site
3 926 Highland Drive
Carlsbad, California
In accordance with your request, we have updated the Report of Limited Soil Investigation
for subject prope1ty, more specifically refimed to as being APJ\ 207-130-60-00, in the City
of Carlsbad, State of California.
A recent inspection of the site and general area indicates that site conditions remain
substantially un-:hanged since the time when our field investigation was conducted on April
2009.
The conclusions and recommendations as presented in the above-mentioned Report of
Limited Soil Investigation are still applicable and should be adhered to. The following
recommendations are presented in accordance with the 2013 CBC.
Seismis Coeffients
Site Coordinates Latitude = 33.1547
Longitude = -117.3297
Site Class = D
Spectral Response Acceleration
At Short Periods Ss = 0.738
Spectral Response Acceleration
At I -second Period SI = 0.255
Sms FaSs 0.892
Sm! = FvSI = 0.482
Sds = 2/3*Sms = 0.595
Sdl 2/3*Sm 1 = 0.321
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Project No. 09-l I 06G6
Seismic Earth Pressure
Diversified Construction, Inc. 06/09/16
3926 Highland Drive
Page 2
Seismic earth pressures can be taken as an inverted triangular distribution with a maximum
pressure at the top equal to 12H pound per square foot (with H being the height of retained
earth in feet). This pressure is in addition to the static design wall load. The allowable
passive pressure and bearing capacity can be increased by 1/3 in determining the stability
of the wall. A factor-of-safety of 1.2 can be used in determining the stability of the
retaining wall under seismic conditions.
All other recommendations presented in the above-mentioned report are still applicable,
and should be followed.
,Respectfully subm·
/ ALLIED EART
ROBERT