ITEM:		CONSENT CALENDAR
4.	CONSIDER APPROVAL OF FUNDS TO ENTER INTO CONTRACT WITH ZIM INDUSTRIES TO REHABILITAE ASR 1
Meeting Date:			March 16, 2020	Budgeted:	Yes
From:			David J. Stoldt	Program/	Water Supply Projects
			General Manager	Line Item No.:	1-2-1
Prepared By:			Jonathan Lear	Cost Estimate:	$104,460
General Counsel Review: N/A
Committee Recommendation: The Administrative Committee reviewed this item on March 10, 2020 and recommended approval.
CEQA Compliance: This action does not constitute a project as defined by the California Environmental Quality Act Guidelines section 15378.

SUMMARY: While CalAm was operating ASR 1 in recovery over the 2019 summer, District staff noted that the required flush rate of 3,000 gpm by the Department of Drinking Water Permit could no longer be maintained without the pump bowles breaking suction and causing cavitation.

Upon further investigation, the constant sustainable flux rate of ASR1 was determined to be approximately 2,250 gpm. At that point CalAm and the District approached DDW and modified the conditions of the permit to flush at the sustainable rate but for a longer period of time prior to using ASR1 as a source to the system.

Long term operations of ASR1 both in injection and recovery will require the well be formally rehabilitated to restore efficiency and operational flexibility of the ASR well field.

RECOMMENDATION: Staff recommends the Board direct the General Manager’s to enter into an agreement for $104,460 with ZIM Industries to complete a formal rehabilitation of ASR 1.

BACKGROUND: ASR1 was constructed in 2001 and was last rehabilitated in 2007, after which the well displayed a pumping specific capacity of 59.7 gallons per minute per foot of drawdown (gpm/ft). Since then, the well’s performance has steadily declined to 31.1 gpm/ft as a result of residual plugging, representing a decline of approximately 48 percent. It is noted that the observed decline due to residual plugging from injection operations is to be expected as with most ASR wells, and the periodic rehabilitation of ASR wells is a part of the routine maintenance required to maintain capacity and extend useful well service-lives.

In late January MPWMD staff directed Pueblo Water Resources to send a request for quotes to three qualified contractors holding valid licenses (C-57/C-61) to perform a formal rehabilitation on ASR 1. The lowest quote was submitted by ZIM Industries whom has also successfully performed rehabilitations on ASR 2 and 3.

IMPACT TO STAFF/RESOURCES: Funds for this project are included in the FY 2019-20 budget under “Water Supply Projects,” line item 1-2-1. Funds expended to complete this work will be reimbursed to the District by CalAm through the ASR Management and Operations agreement between the District and CalAm. Staff time will be utilized to provide project management and oversee field work.

EXHIBIT

4-A Technical Specifications and quotes received to complete ASR 1 rehabilitation work

4-B Email stating no bid received from Layne

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