HomeMy WebLinkAbout121 W Bleeker HPC_Engineering Comments_02121 W Bleeker – HPC Conceptual Review
Engineering Comments
Carly McGowan
March 11th, 2021
Comments to be resolved prior to HPC approval:
1. The proposed water service line is shown to go through the drip line of a large tree, with
excavation likely required into the drip lines of two other large trees. Applicant shall work with
the Parks Dept to resolve this issue and coordinate water line placement prior to HPC approval.
2. Per the CoA Urban Runoff Management Plan (URMP), drywells must be located a minimum of
10’ away from property lines and structures. The plans show the water quality drywell located
less than 10’ away from the property line. A variance will not be granted for the distance
between the drywell and the property line. If a variance is requested for the distance between
the drywell and the structure, applicant must submit a variance request and a letter from a
geotechnical engineer that the building foundation will not be compromised. This shall be
resolved before HPC approval.
3. What transformer serves the property and does the existing transformer have capacity for the
increased use? Will this property require a new transformer? Work with the City Electric
Department to determine available capacity. A Load Calc Form will be required at time of
building permit. Hotel Aspen is planning on upgrading transformers on their property. Verify
that the proposed work aligns with the planned transformer work at Hotel Aspen. This shall be
resolved before HPC approval.
Other Comments:
1. At building permit, plans shall show how the water service line ties into the structure. An
unrestrained service line through the house is not recommended. Instead, plans should include
a small mechanical room at the front of the house to switch to internal plumbing.
2. Since this property is in the Aspen Mountain Drainage Basin, detention is not required.
However, it needs to be clearly shown how runoff above the WQCV leaves the site. With the
proposed drywell the overflow route is not clear. At building permit, applicant will need to show
how additional runoff is routed to the City’s storm system without impacting neighboring
properties. If this can’t be accomplished, detention will need to be provided.
3. Stormwater from all impervious areas on the property must be treated for water quality.
4. Only one drywell is proposed on the planset, but the detail calls out the connection to a second
drywell. If two drywells are proposed, both must meet the 10' setback from all structures and
property lines.
5. Clarify the purpose of the filter fabric around the drywell. Studies show that filter fabric is the
first thing to clog, and removing or repairing the filter fabric would require excavating the entire
drywell.
6. Clarify what the 8.5’x24’ dotted line around the drywell represents.
7. This property is in a sidewalk deferred zone. A sidewalk will not be required at this time.