HomeMy WebLinkAboutParcel Map 12189 Parcel 1-4 Soils & Hydrology Exception Letter
October 22, 2024
To Whom it May Concern,
This precise grade plan is being submitted to correct an existing drainage issue on the subject site. The
project was previously graded and was not properly stabilized which is causing erosion issues within an
existing MWD easement. It should be noted that the erosion issue on-site is not solely caused by the
Morning Ridge Apartments. Survey data has been collected to verify drainage patterns and site walks
were conducted during storm events. There are multiple factors that are causing the erosion issue on
site. These factors include, but are not limited to:
1. There are three Existing residential properties located on the south and east of said easement
that are directing concentrated storm flows from their rear yards, through the use of yard drain
and storm systems, towards the easement area.
2. There is an existing drive approach located off Margarita Road that is allowing storm water
located within the public street to “jump” the curb and enter the easement area.
3. There is storm water being directed into the easement area through way of a drive approach
located on Agena Street.
The purpose of this precise grading plan is to eliminate all offsite drainage runoff that occurs from the
Morning Ridge Apartment site only. The property owner is cleaning out his existing storm drain system
and is installing a rock line ditch along the toe of an existing slope. This ditch follows the property line
north and will tie into an existing under sidewalk drain located on Rancho California Road. This rock
lined swale will control velocities, minimize sediment discharge, and will ultimately eliminate the cross-
lot drainage from the apartment property that encroaches into the MWD easement. These flows are
minimal and are already existing on-site. Minimal grading will be performed on site as a swale will be cut
in at the toe of an existing slope. The remaining area will be smoothed to return it to its previous graded
state. It has been determined that a hydrology study should not be required as the overall historic
drainage patterns are not changing. A soils report is also not being prepared unless staff finds it
necessary otherwise.
If staff feels that this project should require said documents, please do not reach out so it can be
discussed in more detail.
Respectfully,
Michael Brendecke, R.C.E, PLS
Senior Project Manager
mbrendecke@adkan.com
www.adkan.com
APPROVED BY
CITY OF TEMECULA
PUBLIC WORKS
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