HomeMy WebLinkAboutFile Documents.430 W Hallam St.0291.2017 (98).ARBK
WELS Irrigation Audit Report and Letter of Approval
Azure Drone Engineering, LLC has inspected the installed irrigation system 430 Hallam
St. on November 10th and found that the irrigation system is installed per the City of
Aspen Water Efficient Landscape Standards (WELS). The installed irrigation system
differs from the approved WELS plan, but in ways that do not affect the conformance to
the WELS standards or the efficiency of the system. The as-built drawings produced by
Azure represent the installed system. See the Audit Report on the next page.
The 430 Hallam Street irrigation system is Approved by Ed Price, Azure Engineering, LLC.
__________________________
Edward W. Price
CID # 50322
Date: January 22, 2024
To: City of Aspen
From: Azure Engineering, Ed Price
Project: 430 Hallam Street
Contact: Shaun Hornburg, Landscapes and Beyond
RE: 430 Hallam St. Irrigation Approval and Audit Report
Date: December 1, 2023
2
430 Hallam St. Irrigation Audit Report
The newly installed irrigation system at 430 Hallam St. was inspected by Azure
Engineering on November 10th, 2023. The system was primarily installed per irrigation
plans submitted and approved by the City of Aspen. The irrigation backflow preventer is
installed in a basement mechanical room; and we tested pressure at the site and it is
lower than stated on the irrigation plans at 65 PSI static pressure. Dynamic pressure in
the irrigation mainline is calculated to be approximately 50 PSI and is adequate to meet
the minimum equipment design pressure; with drip irrigation requiring 30 psi and the
rotator sprinklers requiring 40 psi. The as-built drawings and hydro-zone plans can be
used by the City to review compliance with the City of Aspen WELS code.
Just a few items to note on the system are:
All sprinklers and drip equipment are pressure regulating per plan.
A Rain Bird ESP4Me Wifi smart controller with weather sensor are installed and
connected per plan and manufacturer specs.
The flow sensor and master valve are installed and connected to the controller
and set up for flow sensing and system shut down in a malfunction event.
The locking ball valve is installed on the first section of mainline outside the
residence and is installed per WELS requirements.
The contractor installed up to four (4) control valves in each control valve
manifold box, which differs from the plans.
There are no rooftop irrigation zones requiring soil moisture sensors.
There are fourteen (14) total irrigation zones on the site. Four turf sprinkler zones were
tested with catch cans to verify precipitation rate (PR) and Distribution Uniformity (DU).
We will use the precipitation rates calculated from the from the manufacturer published
rates and the design software for the balance of the drip irrigation zones. The irrigation
zone data is as follows:
Zone 1: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
Zone 2: Trees, 3/4" poly drip pipe with point source drip emitters, 0.17 in/hr
Zone 3: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
Zone 4: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
Zone 5: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
Zone 6: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
Zone 7: Turf, Hunter MP Rotators, 4.4 GPM, Catch Can Test:
o Average Catch Can Volume- 9.81mm
o Catch Can Throat Area- 15.9 in2
o Test Run Time- 5.45 minutes
RE: 430 Hallam St. Irrigation Approval and Audit Report
Date: December 1, 2023
3
o Calculated Precipitation Rate= 0.39 in/hour
o Distribution Uniformity= 0.84, 84%
Zone 8: Turf, Hunter MP Rotators, 6.2 GPM, Catch Can Test:
o Average Catch Can Volume- 9.62mm
o Catch Can Throat Area- 15.9 in2
o Test Run Time- 5:40 minutes
o Calculated Precipitation Rate= 0.38 in/hour
o Distribution Uniformity= 0.82, 82%
Zone 9: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
Zone 10: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
Zone 11: Turf, Rain Bird Sprays, 7.3 GPM, Catch Can Test:
o Average Catch Can Volume- 13.7 mm
o Catch Can Throat Area- 15.9 in2
o Test Run Time- 2:42 minutes
o Calculated Precipitation Rate= 1.64 in/hour
o Distribution Uniformity= 0.82, 82%
Zone 12: Turf, Hunter MP Rotators, 4.4 GPM, Catch Can Test:
o Average Catch Can Volume- 12.4mm
o Catch Can Throat Area- 15.9 in2
o Test Run Time- 7:45 minutes
o Calculated Precipitation Rate= 0.45 in/hour
o Distribution Uniformity= 0.75, 75%
Zone 13: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
Zone 14: Shrubs/Perennials, Netafim inline drip tubing, model TLCV9-12, 1.48
in/hr
RE: 430 Hallam St. Irrigation Approval and Audit Report
Date: December 1, 2023
4
Irrigation Maintenance Schedule
SPRING:
1. Turn ON water to irrigation system with one (1) sprinkler zone operating to
remove trapped air.
2. After all air discharges from the one (1) sprinkler zone and only water discharges
from the operating zone, operate each zone until only water discharges from the
emission devices
3. Start operation of the irrigation system using a spring operating schedule or if
WiFi capable, check that controller is connecting to the internet and
downloading daily weather data
4. Check that all drip pipes are still located correctly and emitting water to the
correct plants as designed.
5. Check that all sprinklers are adjusted to reduce over-spray onto hard scape and
that they completely cover their area of service
6. Replace and re-adjust any irrigation equipment broken over the winter with the
exact make and model of the broken part
7. Clean and check operation of rain sensor
8. Check for proper operation of flow sensor and controller flow manager
9. If controller is not WiFi capable, adjust controller operating schedule bi-monthly
as necessary to maintain plant health without over watering
SUMMER:
1. If controller is not WiFi capable, adjust controller operating schedule bi-monthly
as necessary to maintain plant health without over watering
2. Check that all drip pipes are still anchored and emitting water to the correct
plants as designed.
3. Check that all sprinklers are adjusted to reduce over-spray onto hard scape and
that they completely cover their area of service
4. Replace and re-adjust any irrigation equipment broken over the winter with the
exact make and model of the broken part
FALL:
1. If controller is not WiFi capable, adjust controller operating schedule bi-monthly
as necessary to maintain plant health without over watering
2. Check that all drip pipes are still anchored and emitting water to the correct
plants as designed.
3. Check that all sprinklers are adjusted to reduce over-spray onto hard scape and
that they completely cover their area of service
4. Replace and re-adjust any irrigation equipment broken over the winter with the
exact make and model of the broken part
5. Winterization-
a. CLOSE gate valve on water supply from the house
b. OPEN drain valve on water supply pipe in basement if applicable
c. Connect air compressor to quick coupler valve nearest the irrigation
water supply
Operate each irrigation zone until only air discharges for zone emission
devices