HomeMy WebLinkAbout1.15 2018 Filing 2 FP Zancanella Report Lake Springs Ranch
Comprehensive Plan 2030 – FLUM Amendment Application November 2022
Exhibit 17 | 2018 Zancanella Report (Filing 2 Final Plat)
December 13, 2016
Tim Malloy
TC Malloy Consulting, LLC
402 Park Drive
Glenwood Springs, CO 81601
Re: Lake Springs Ranch PUD
Dear Tim:
This report is in support of final plat application for Filing 2, PUD amendment. The
amendment that resulted in reduction in the number of units was completed in 2012. More
recent PUD amendments included a request to reduce the number of multi-family units
(from 18 to 12) was completed earlier this year. There are no reduction in units associated
with this application (final plat only). The current unit count is 118 single-family lots
(including the lot upon which the existing Berkeley residence is located), plus 12 multi-
family affordable housing units. See attached Sheet Plan-01 for additional development
summary data. All units were assumed to be one EQR in both the original and the
proposed amend PUD plan. Two existing commercial units were also included in the
event the existing sod farm operation is serviced from the central system for a total of 130
EQRs. Five additional EQRs were included to provide some additional water rights
flexibility. The estimated water demands are shown in Table 2a.
The water demands of the Lake Springs Ranch PUD will be satisfied by two wells, Well
D and Well E. Our previous reports to the County dated June 28, 2001, May 7, 2002,
and, March 25, 2010 confirmed that the two wells are legally entitled to produce water
sufficient to meet the needs of 198 EQRs under the Basalt Water Conservancy District
contract approved in Case No. 95CW078. All of the Lake Springs Ranch Wells A-E are
covered by one Basalt District Contract up to 450 gpm and consumptive use of 66 acre
feet. This allows both the 135 units and additional uses at the sod farm to be
accommodated. The contract and the well permits are up to date and in good standing.
The previous reports stated that, although Well D is capable of producing water of
sufficient quantity and quality to meet the needs of 198 EQRs on its own, a second well
(Well E) would be constructed as a backup well.
Well E has now been constructed, tested at 220 gpm and is being used for supplemental
irrigation purposes. The attached report confirms that Well E produces water in sufficient
quantities and quality to meet the needs of the amended PUD (see attached Well E test
report Appendix B). Wells D and E are located adjacent to the tank and are both
completed into the same aquifer. Either well is capable of providing an adequate water
supply for the proposed PUD in both quantity and quality.
Table 2a attached provides a summary of the water demands and consumptive use
associated with the PUD. The average monthly peak demand in June is 73 gpm. Well E
was pumped at a rate of 220 gpm. Table 1 also shows that the proposed amended PUD
would use 17.39 of the 27 acre feet of the Basalt Contract dedicated to the Lake Springs
Ranch. Finally, we have attached a current letter from the Basalt District stating that wells
A-E are in good standing and covered by the Basalt Decree or the Basalt TSSP.
In November 2016 Well D was retested at a pumping rate of 100 gpm for 24 hours to
confirm that the available well capacity had not declined. A second set of water quality
parameters were collected for laboratory analysis based on CDPHE requirements. All of
the parameters were within acceptable levels. See attached results in Tables WQ 1 and
WQ 2 attached.
The second well test for Well D showed little drawdown while pumping the Well D at 100
gpm. The proposed pumping rate for the long term use of the wells for both Well D and
Well E should be pumped at a rate of 100 gpm. The well setting should be 240 feet for
each well so that the production and pumping head is closely matched into the tank
discharge elevation.
We would also recommend that the piping between the tank and the chlorination facility
be piped with large diameter pipe (12 inch) piping to provide mixing and plugged flow for
additional chorine contact prior entry into the tank. The appropriate pipe size will be based
on the CDPHE submittal requirements CT time.
If you have any questions, please contact our office at (970) 945-5700.
Very truly yours,
Zancanella & Associates, Inc.
Thomas A Zancanella
Thomas A Zancanella | P.E.
Office: 970.945.5700 | 970.379.2926 | Fax: 970.945.1253
taz@za-engineering.com
Zancanella & Associates Inc. | Engineering Consultants
1011 Grand Avenue | Glenwood Springs, CO 81601
Attachments
cc: Mike Berkeley
z:\97000's\97407 lake springs sub., dr. berkeley\2016\county report\lake springs pud report-malloy.docx