Receive and File Water Year 2008 Seaside Basin Aquifer Storage and Recovery Summary Report


Meeting Date:

April 20, 2009





Darby Fuerst,




General Manager

Line Item No.:


Prepared By:

Joe Oliver

Cost Estimate:



General Counsel Approval:N/A

Committee Recommendation: N/A

CEQA Compliance:N/A


SUMMARY:A draft report documenting the summary of operations for Water Year 2008 at the Districtís Santa Margarita test well facility (now known as the Phase 1 Aquifer Storage and Recovery [ASR] site) has been prepared by the Districtís technical consultant on the project, Pueblo Water Resources, Inc.The draft report is provided as Exhibit 13-A.The report documents the ASR activities conducted at the Phase 1 ASR site during WY 2008, including:(a) recharge operations, (b) well performance, (c) water quality testing, and (d) geochemical analyses.


RECOMMENDATION:The Board should receive the draft report documenting ASR activities at the Phase 1 ASR site during WY 2008.If this item is adopted along with the Consent Calendar, the report will be finalized and distributed, subject to inclusion of comments from the District or other interested parties.


BACKGROUND:The District has been studying the Aquifer Storage and Recovery (ASR) concept in the Seaside Basin since 1996.The concept entails diverting excess winter flows from the Carmel River Basin approximately six miles to the hydrologically-separate Seaside Basin, where the water is injected into specially-constructed ASR wells, for later recovery during dry periods.Prior to injection, the diverted water is treated so that it meets potable drinking water standards.†† In 1998, the District constructed a pilot injection well, known as the Paso Robles Test Injection Well (PRTIW) in the northeastern portion of the City of Seaside.The pilot well is 12 inches in diameter, 460 feet deep, and screened in the Paso Robles Formation aquifer.Injection testing during WYs 1999 and 2000 at the pilot well provided data that allowed the District to proceed with construction of a larger injection test well, SMTIW No. 1 (now referred to as ASR Well No. 1) in 2001 on the former Fort Ord Military Reservation, approximately 300 feet east of the PRTIW.ASR Well No. 1 is 18 inches in diameter, 720 feet deep, and screened in the Santa Margarita Sandstone aquifer.The Santa Margarita aquifer has more favorable hydrogeologic characteristics, and is therefore more conducive to a full-scale ASR project in the basin.SMTIW No. 2 (now referred to as ASR Well No. 2) was drilled in 2007 and equipped with permanent pump and motor in 2008.ASR Well No. 2 is larger and deeper, at 22 inches in diameter and 790 feet deep.The draft report (Exhibit 13-A) has been sent to California American Water staff for their review and comment.The report, once finalized, will be a useful reference document to support future testing and operations at the Phase 1 ASR Project site.


IMPACT ON STAFF/RESOURCES:A significant staff effort has been expended planning, coordinating, and overseeing work on the Districtís ASR testing program in the Seaside Basin.It is planned to continue this level of effort during the remainder of this year and into the next recharge season.



13-A††† Draft WY 2008 Summary of Operations, Phase 1 ASR Project report, dated January 2009



J. Oliver, 4/20/2009 staff note, 2 pages, rev2