HomeMy WebLinkAbout05.0 Impact Analysis Letter2. Site Features. A description of site features such as streams,
areas subject to flooding, lakes, high ground water areas,
topography, vegetative cover, climatology, and other features
that may aid in the evaluation of the proposed development.
The attached site plan indicates swales and other
topography in the area where the ADU is planned. The C &
M Ditch runs through our property , however the land does
not have any natural water features, and the grade is such
that there are not areas in this location that would be
subject to possible extreme flooding. The building site is
currently covered in natural grasses and short
vegetation(no trees), small rocks and dirt.
See TABBED Site Plan
3. Soil Characteristics. A description of soil characteristics of the
site that have a significant influence on the proposed use of the
land.
The soil was tested by HP Geotech on February 12, 2016
and was found to be in good condition for building.
Additionally, the Professional Engineer, Daniel E. Hardin,
has made recommendations for the building foundation, the
scope of which will be followed for the proposed building.
See TABBED Complete Subsoil Study
4. Geology and Hazard. A description of the geologic
characteristics of the area including any potential natural or
manmade hazards, and a determination of what effect such
factors would have on the proposed use of the land.
There is an area that was previously excavated for the
planned, but ultimately not built barn, which was partially
dug into a gentle hill next to the existing home. The plan for
our ADU building is to continue to work with the previous
excavation and the natural flow of the land, grading only as
necessary to keep any natural water flow away from the
foundations of both buildings on the property. This use
would not create a new potential manmade hazard.
Per the Garfield County Hazard Identification and Risk
Assessment for this rural area, the potential natural hazards
such as lightning, forest fire or flooding from the ditch are
ones that exist for all the homes in the subdivision - this
proposed building runs no greater risk, nor does it add any
possible new hazards.
5. Groundwater and Aquifer Recharge Areas. Evaluation of the
relationship of the subject parcel to Floodplains, the nature of
soils and subsoils and their ability to adequately support waste
disposal, the Slope of the land, the effect of sewage effluents,
and the pollution of surface Runoff, stream flow, and
groundwater.
The proposed ADU would be located within the appropriate
building envelope for the development. With the addition
of another tank commensurate with the proposed number
of bedrooms, the septic system for this building will be
designed per the Garfield County regulations. The analysis
and report for this information was done by Carla Ostberg,
NAWT Certified Inspector with All Service Septic, LLC.
The report, photographs, recommendations and proposal
for the improvement are enclosed and tabbed in this
notebook. Additionally, there was an original Subsoil Study
performed when the existing home was built, which is also
included. The report states the results of the percolation
test done at that time and it was determined the area is
suitable for a conventional infiltration septic disposal
system and leech field.
See TABBED Complete AllService Septic Report, Onsite
Wastewater Treatment System Inspection, Previous 1998
Subsoil Study and Percolation Test and Original Sewage
Permit Pages
Please feel free to contact me via phone (303-619-4640) or e-mail
(kirkwilliams(hangar45.com) if you have any additional questions or
need any further clarification.
Sincerely,
Joseph(Kirk) Williams and Jan Williams
Homeowners/Applicants
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