HomeMy WebLinkAboutCDP 03-12; ADAMS STREET SFR NORTH; SLOPE STABILITY; 2010-10-28Slope Stability Near Vertical Temporary Construction Slopes Page 2
475 Park Drive and 4488 Adams Street, Carlsbad October 28, 2010
range from approximately ¼ 1 t 11 (horizontal to vertical) above The construction slopes are Jn substantial
conformance with our recommendations presented in the preliminary investigation (reference above) and were
expected to be temporary slopes with wall and building construction to follow in a timely manner However,
we understand that the temporary construction slopes remain as constructed in 2006
The following was noted
1 The temporary slopes are largely covered by jute matting
2 The slopes expose cemented sandstone deposits
3 Some minor erosion and shallow ruts are present on all temporary slopes
4 More moderate erosion is present on the west end of the north temporary slope at the northern pad
location (475 Park Avenue) The noted erosion is the result from runoff in a brow ditch that drains
over the slope and onto the building pad areas
Ill CONCLUSIONS
The temporary .construction slopes were expected to be only temporary. However, after remaining exposed
for more than 4-years the slopes are considered to be performing well Noted erosion of the sl6pe7 faces is
surficial No evidence of deep-seated instability within the temporary slopes is mdicated
The jute matting should be maintained to impede further erosion of the slope faces, and consideration should
be given to addressing the brow ditch that drains onto the north building pad
All the temporary sloped should be re-evaluated prior to building or wall constructions Additional temporary
slope recommendations, if warranted, can be given at that time
If you have any questions or, need clarification, please do not hesitate to contact the undersigned Reference
to our Job #05-422 and 423-F will help to expedite our response to your inquiries
We appreciate this opportunity to be of service to you
VLNJIE & MIDDLETON ENGINEERING, iNC -
b iL Ninn O.
Steven J. Melzer CER 1E
alh
2362
GIST Exp
mpr\my files\grading department projects\05422 and 423-f-,kirk patrick development\slope stability near vertical temp construction slopes letter
VINJE & MlDDLEToN'ENGINfRrNG;INc. 2450 Auto Park Way Etcondido, California 92029-I229 Phone (760) 743-1214