M E E T I N G N O T I C E AND A G E N D A TECHNICAL ADVISORY COMMITTEE OF THE SEASIDE BASIN WATER MASTER

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1 M E E T I N G N O T I C E AND A G E N D A TECHNICAL ADVISORY COMMITTEE OF THE SEASIDE BASIN WATER MASTER DATE: Wednesday, January 9, 2019 MEETING TIME: 1:30 p.m. Monterey One Water Offices 5 Harris Court, Building D (Ryan Ranch) Monterey, CA If you wish to participate in the meeting from a remote location, please call in on the Watermaster Conference Line by dialing (515) Use the Meeting ID Please note that if no telephone attendees have joined the meeting by 10 minutes after its start, the conference call will be ended. OFFICERS Chairperson: Nina Miller, California American Water Company Vice-Chairperson: Jon Lear, MPWMD MEMBERS California American Water Company City of Del Rey Oaks City of Monterey City of Sand City City of Seaside Coastal Subarea Landowners Laguna Seca Property Owners Monterey County Water Resources Agency Monterey Peninsula Water Management District 1

2 Agenda Item 1. Public Comments 2. Administrative Matters: A. Approve Minutes from the December 12, 2018 Meeting B. Sustainable Groundwater Management Act (SGMA) Update 3. Continued Discussion of Basin Management Action Plan Update 4. Schedule 5. Other Business Page No The next regular meeting will be held on Wednesday February 13, 2019 at 1:30 p.m. at the M1W Board Room. ` 2

3 SEASIDE BASIN WATER MASTER TECHNICAL ADVISORY COMMITTEE * * * AGENDA TRANSMITTAL FORM * * * MEETING DATE: January 9, 2019 AGENDA ITEM: 2.A AGENDA TITLE: PREPARED BY: Approve Minutes from the December 12, 2018 Meeting Robert Jaques, Technical Program Manager SUMMARY: Draft Minutes from this meeting was ed to all TAC members. Any changes requested by TAC members have been included in the attached version. ATTACHMENTS: RECOMMENDED ACTION: Minutes from this meeting Approve the minutes 3

4 D-R-A-F-T MINUTES Seaside Groundwater Basin Watermaster Technical Advisory Committee Meeting December 12, 2018 Attendees: TAC Members City of Seaside Rick Riedl California American Water Nina Miller City of Monterey Max Rieser (via telephone) Laguna Seca Property Owners Bob Costa MPWMD Jon Lear (via telephone) MCWRA Tamara Voss) City of Del Rey Oaks No Representative City of Sand City Leon Gomez Coastal Subarea Landowners No Representative Watermaster Technical Program Manager - Robert Jaques Consultants Montgomery & Associates - Georgina King Others M1W Bob Holden The meeting was convened at 1:36 p.m. after a quorum had been established. 1. Public Comments There were no public comments. 2. Administrative Matters: A. Approve Minutes from the November 21, 2018 Meeting Mr. Gomez requested that the first sentence in the second paragraph under Other Business of the minutes be advised to read as follows: Mr. Gomez commented that the vesting tentative map for this project did not appear to show existing wells, and he did not see this well on that map. On a motion by Mr. Gomez, seconded by Ms. Miller, the minutes were unanimously approved with Mr. Gomez s requested edit. Mr. Lear asked Mr. Gomez if the information he had provided to him after the last TAC meeting with regard to this well was sufficient. Mr. Gomez said that the information was helpful and that he would be contacting Mr. Lear in the near future for a follow-up discussion. 4

5 B. Update on Draft Agreement with Cal Am and MPWMD for Storage and Recovery of Water from the Pure Water Monterey Project Mr. Jaques summarized the agenda packet materials for this item. On a motion by Ms. Voss, seconded by Mr. Lear, the TAC unanimously approved the proposed language revisions to the Storage and Recovery Agreement, as described in the agenda packet. 3. Basin Management Action Plan Update Mr. Jaques provided some introductory remarks and summarized the agenda packet transmittal for this item. Ms. King provided a presentation using the attached PowerPoint slides. Mr. Jaques suggested that in order to provide time to review Mr. Yates comments and recommendations prior to presenting the BMAP Update to the Board, it would likely be February before the item would be put on the Board s agenda, rather than trying to put it on their January 2, 2019 agenda. This would allow time for further TAC discussion on this topic at its January 9 meeting. During her presentation Ms. King noted that water levels in the Northern Coastal Subarea have been declining from 1 to 1.5 feet per year on average near the coastline. Mr. Costa asked if this was a significant rate of decline. Ms. King responded that it is the long-term effect of this ongoing decline that is significant, and that such a rate of decline is not sustainable without adverse impacts to the aquifers. She went on to say that only the Southern Coastal Subarea wells remain above protective water levels. During her presentation she explained that there is a large amount of available storage space because so much water has been drawn out of storage over the years. She pointed out that optimizing storage efficiency is necessary in order to make as much of the stored groundwater available for beneficial use. The bulk of the inflow from the ocean is into the Aromas Sands, but there is some inflow into the Santa Margarita aquifer. However, this is non-saline water that was stored in the Santa Margarita aquifer offshore under the ocean. Over the time period examined in the BMAP Update, on average about 1,450 acre-feet of water has been lost out of the Basin each year. This amounts to approximately 43,500 acre-feet of water being lost over the last 30 years. Within the Basin most of the inter-subarea flows go into the Northern Coastal Subarea due to the pumping cone of depression there The Decision set the Natural Safe Yield at 3,000 acre-feet per year. Using data over the period 1988 through 2017, the total basinwide Natural Safe Yield is calculated as being 2,310 acre-feet per year. In the Laguna Seca Subarea even if all pumping were to be stopped, water levels in the eastern portion of that subarea would continue to fall. Historically, water has flowed into the Laguna Seca Subarea from the Corral de Tierra subbasin. In the future, however, when water levels in the Laguna Seca Subarea rise as a result of reducing pumping in that subarea, there will be flow out of the Laguna Seca Subarea into the Corral de Tierra subbasin. Ms. King summarized the Basin management objectives to be raising water levels, optimizing recharge and storage capacity, and managing and reducing the threat of seawater intrusion. 5

6 Mr. Jaques commented that a change in the Natural Safe Yield from 3,000 acre-feet per year to 2,310 acre-feet per year would impact Standard Producers, because they would have to further reduce pumping beyond the currently scheduled ramp-downs in pumping in order to reduce pumping to fall within the lower Natural Safe Yield. Mr. Jaques said he would agendize this topic for further discussion at the January TAC meeting. 4. Other Business There was no other business. The meeting adjourned at 2:35 PM 6

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12 SEASIDE BASIN WATER MASTER TECHNICAL ADVISORY COMMITTEE * * * AGENDA TRANSMITTAL FORM * * * MEETING DATE: January 9, 2019 AGENDA ITEM: 2.B AGENDA TITLE: PREPARED BY: Sustainable Groundwater Management Act (SGMA) Update Robert Jaques, Technical Program Manager At the State level: Since my last update, I have not received any new materials from the State that would impact the Watermaster. At the Monterey County level: At the SVBGSA Advisory Committee meeting on December 20 th the principle agenda item was a presentation by Derrik Williams on additional draft chapters of the GSP for the foot aquifer and the draft Valley Wide Management Plan. At this point in time only the initial draft chapters of these reports had been prepared and none of them contained any content that would directly impact the Watermaster or the Seaside Basin. I did, however, submit some suggested minor edits to amplify or clarify a few statements pertaining to the Seaside Subbasin. ATTACHMENTS: RECOMMENDED ACTION: None None required information only 12

13 SEASIDE BASIN WATER MASTER TECHNICAL ADVISORY COMMITTEE * * * AGENDA TRANSMITTAL FORM * * * MEETING DATE: January 9, 2019 AGENDA ITEM: 3 AGENDA TITLE: PREPARED BY: Further Discussion on the Basin Management Action Plan Update Robert Jaques, Technical Program Manager At the December 12, 2018 TAC meeting there was initial discussion of the Preliminary Draft Updated BMAP. Due to the significance of certain of the findings and conclusions in the Updated BMAP, I had Gus Yates of Todd Groundwater review the document and provide his comments on it and any recommendations he may have pertaining to it. This topic is on today s agenda for continued discussion of this topic, with the benefit of Gus Yates review of the document and his subsequent discussions with Georgina King of Montgomery & Associates, who prepared the Updated BMAP, regarding his comments and questions about the document. Mr. Yate s Memo summarizing the results of his review is attached. In addition he commented in an that the approach to quantifying basin yield should be discussed with the TAC at today s meeting, because the yield calculation methodology is an important issue. He further commented that it was his recommendation that we should depart from the simplistic notion of Natural Safe Yield (NSY) and the simple methodology he used back in 2004 when he was developing the initial NSY figure that is contained in the Adjudication Decision. Ms. King provided the attached discussion paper in response to her discussions with Mr. Yates regarding his comments and questions. As with the agenda transmittal on this topic in the December 12 TAC agenda, because the Preliminary Draft of the updated BMAP is quite lengthy, only the Executive Summary from that document is attached. However, a full copy of the document is posted for review on the Watermaster s website at: BMAP%20Updated%20Draft%20with%20Changes%20Accepted% pdf. At this point Ms. King has not made any changes to the Preliminary Draft, pending TAC input and direction at today s meeting. Ms. King and Mr. Yates will join today s meeting via the teleconference line to discuss and respond to questions regarding the Updated BMAP. 13

14 SEASIDE BASIN WATER MASTER TECHNICAL ADVISORY COMMITTEE * * * AGENDA TRANSMITTAL FORM * * * ATTACHMENTS: RECOMMENDED ACTION: 1. Technical Memo from Gus Yates with his comments and recommendations following his review of the Preliminary Draft Updated BMAP 2. Discussion Paper from Georgina King with her responses regarding Gus Yates Technical Memo 3. The Executive Summary from the Preliminary Draft Updated BMAP Provide input and direction regarding the two issues discussed in Georgina King s Discussion Paper, and any other issues the TAC feels warrant input and/or direction 14

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18 Table 10. Modeled Water Budget, Average over Water Years Northern Coastal Subarea Northern Inland Subarea Southern Coastal Subarea Laguna Seca Subarea Total Recharge Source Acre-feet per Year Basin Inflows Percolation from streams Deep Percolation Rainfall 510 1, ,210 Irrigation & System Losses Injection wells Groundwater inflow From adjacent subareas 2,900 1, ,300 From adjacent basins ,350 From offshore area Total inflows 4,440 3, ,040 10,900 Basin Outflows Wells 3, ,580 Groundwater outflow To adjacent subareas of the Basin 290 2, ,750 5,300 To adjacent basins 280 1, ,150 To offshore area Total outflows 4,490 4, ,920 12,350 Storage Change Based on Inflows-Outflows ,450 Note: values are rounded to nearest

19 Table 12. Estimated Water Year Natural Safe Yield of the Seaside Groundwater Basin Yield Components and Adjustments 1 Coastal & Inland Subareas Laguna Seca Subarea acre-feet per year Total Current pumping (prescribed pumping plus recovery of injected water) 3, ,580 Storage change ,510 Current ocean boundary inflow Injected water Yield (assuming no outflow to the ocean) 3, ,310 Ocean boundary outflow needed to prevent seawater intrusion 3 1, ,000 Natural Safe Yield 2, ,310 Note: values are rounded to nearest The values for pumping, storage change and ocean boundary flows are from the subarea groundwater budgets in Table The estimate of storage change equals the difference between inflows and outflows. 3 Yates et al. (2005). 19

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34 SEASIDE BASIN WATER MASTER TECHNICAL ADVISORY COMMITTEE * * * AGENDA TRANSMITTAL FORM * * * MEETING DATE: January 9, 2019 AGENDA ITEM: 4 AGENDA TITLE: PREPARED BY: Schedule Robert Jaques, Technical Program Manager SUMMARY: As a regular part of each monthly TAC meeting, I will provide the TAC with an updated Schedule of the activities being performed by the Watermaster, its consultants, and the public entity (MPWMD) which are performing certain portions of the work. Attached is the proposed Work Schedule for FY ATTACHMENTS: Schedule of Work Activities for FY 2019 RECOMMENDED ACTION: Provide Input to Technical Program Manager Regarding Any Corrections or Additions to the Schedule 34 1

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38 SEASIDE BASIN WATER MASTER TECHNICAL ADVISORY COMMITTEE * * * AGENDA TRANSMITTAL FORM * * * MEETING DATE: January 9, 2019 AGENDA ITEM: 5 AGENDA TITLE: PREPARED BY: Other Business Robert Jaques, Technical Program Manager SUMMARY: The Other Business agenda item is intended to provide an opportunity for TAC members or others present at the meeting to discuss items not on the agenda that may be of interest to the TAC. ATTACHMENTS: RECOMMENDED ACTION: None None required information only 38