HomeMy WebLinkAbout20042408 Alles Associates
Memo
To Project File Shannon 0301
Date: 10/8/03
Front George D. Paulsberg, P.E.
Re: Soils Evaluation of Project Site
Location
The project site is a portion of the NW '1 of Section 29 lying
west of the Union Pacific Railroad and east of WCR 27, T 1N. ,
R 66W. , 6th P.M. , Colorado.
Reference
Soil Survey of Weld County, Colorado - Southern Part by:
United States Department of Agriculture, Soil Conservation
Service & Colorado Agricultural Experiment Station.
Topography
The land is very flat with only a 4' fall in a length of
1800' for the project site.
Soils On Site
The soils map of the area shows three types of soil found on
the project . The largest area is a Number one-Altvan loam.
This is a deep well drain soil on terraces in old alluvium
deposits by major rivers. The next area is a number 21-Dacono
clay loam on terraces in a mixed alluvium deposited by rivers.
The last area is a number 46-Olney fine sandy loam formed by
mixed out washed deposits. This is a deep well drain soil.
Soil Evaluation
The soil conservation manual uses terms to help identify
soils' ability to function different categories. A "slight"
means generally favorable for function being discussed. A
"moderate" means generally unfavorable but can be over come
with applied engineering to function.
Table 7—Sanitary Facilities rates the #1,Altran, & #46,01ney,
as slight for septic tank and absorption fields, which means
good.
2004-2408
Page two Project Nu. Shannon 0301
The #21, Dacono, is rated severe which means detailed
engineering would be required to make a septic system work
correctly. The area on the project site that is a #21 soil is
very small at the north edge of the northern parcel. Trees,
detention pond or building is planned for that area thus
septic capability is not a concern. Generally, the site is
acceptable for onsite septic systems.
Table 6-Building Site Development rates #1 and #21 soils as
moderate and #46 as slight for small commercial buildings.
Slight means no problems for these buildings. Moderate means
an engineer will need to design the foundation to match the
soil bearing capacity.
Table 12-Engineering Properties and Classifications rates all
three, #1, #21 & #46, in the A-1, A-2, A-6 & only one small
sub-area as A-7 . The A rating using AASHTO system means the
material has good engineering properties for development.
It is my opinion that the on site material is satisfactory for
development with on site septic systems and building
construction of one or two stories with proper engineering for
construction details.
Sincerely
3' ,9 .fr
George D. Paulsberg,
P.E. #35359
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