To: Members of the Castle Rock Water Commission
From:
Matt Benak, P.C. Water Resources Manager
Lauren Moore, Water Resources Program Analyst
Mark Marlowe, P.E., Director of Castle Rock Water
Title
Resolution Approving a Pumping, Aquifer Storage and Recovery Equipment, and Downhole Power Generation Equipment Installation Construction Contract with Hydro Resources - Rocky Mountain Inc. for Wells CR-232 and CR-233
Town Council Agenda Date: Feb 4, 2020
Body
________________________________________________________________________________
Executive Summary
The purpose of the resolution (see Attachment A) is to request Council approval of a Construction Contract (see Exhibit 1) with for the Denver Basin Wells Rehabilitation, Pumping Equipment Replacement, and Well Abandonment Project. In 2016, Castle Rock Water started a planned well rehabilitation program. This program is designed to help maintain water production yields from our current deep well assets and to reduce the likelihood of emergency well failures. The program targets wells that are showing declines in well yield and/or have been identified as equipped with older pumping equipment. This year, we are targeting five Denver Basin wells for planned rehabilitation and equipment replacement in the first one-third of 2020. Additionally, two inactive wells on Town Property will be abandoned per state regulations. Castle Rock Water recommends approval of a construction contract with in the amount of $X,XXX,XXX plus a five percent Town-managed contingency in the amount of $XX,XXX; for a total project cost of $X,XXX,XXX.
Discussion
It is important to keep our existing infrastructure operating in an efficient manner to ensure that peak water demands during the summer months can be met, without resorting to curtailment measures due to well failures. In order to do this, the Water Resources Division has established a yearly rehabilitation and equipment replacement program for priority deep Denver basin wells. A formalized program will help mitigate emergency well services due to pumping equipment failure. This will be accomplished by identifying the wells that are showing declines in production due to biofouling and wells with older pumping equipment. Replacing older pumping equipment often provides the opportunity to resize equipment so that better well efficiency is achieved, potentially reducing the long-term costs to operate the wells. Castle Rock staff has decided that it is wise to replace the existing equipment of the top one-third of the highest producing wells with stainless steel drop pipe. Using stainless steel increases longevity and efficiency of the wells. It will also help slow down the growth of iron bacteria in the wells and help reduce the overall costs of rehabilitation of the wells. The following wells are identified for the 2020 Denver Basin Rehabilitation and Pumping Equipment Project: Arapahoe Aquifer Wells CR-67, CR-118, CR-218, CR-219, and CR-223. The combined daily production from the wells is 2.8 million gallons per day.
Castle Rock Water sent out an Invitation to Bid to four qualified contractors and responded. The following table is a summary of the bids:
The price sheet did include optional bid items which some will not be included in the scope of work.
History of Past Town Council, Boards & Commissions, or Other Discussions
Castle Rock Water Commission was informed of the project at their January 22, 2020 meeting and recommended approval.
Budget Impact
Funding for the project is available in the approved 2019 and 2020 Budgets. 2019 budget funds will be brought into 2020 as a carryforward for this purpose as the project was originally intended to be started in late 2019. Funding for the project will come from Accounts Repair and Maintenance - Wells 210-4250-442.40-37 ($800,000 budgeted) and Well Equip and Replacement 210-4275-442.77-48 ($100,000 budgeted). The following table shows the breakdown of funding. Town staff will use the funds to complete rehabilitation and equipment replacement for this project. proposed fee is $X,XXX,XXX. Staff requests an additional $XX,XXX contingency be authorized for a total authorization of $X,XXX,XXX.
|
Project Account |
Amount |
Contingency |
Total |
|
210-4275-442.40-37 Repair & Maintenance - Wells |
|
|
|
|
210-4275-442.77-48 Well Rehab and Replace |
|
|
|
|
TOTALS |
|
|
|
Recommendations
Staff recommends Town Council approval of the construction contract with for the Denver Basin Wells Rehabilitation, Pumping Equipment Replacement, and Well Abandonment Project.
Proposed Motion
“I move to recommend to Town Council approval of the above Resolution as presented”
Attachments
Attachment A: Resolution
Exhibit 1: Construction Contract
Attachment B: Location Map