B. Description of Proposed Boundary Modification

1. Short Description

   Jurisdictional request to align the Eastern San Joaquin and Tracy Subbasins with the City of Lathrop's City Limit.
2. Type of basin boundary revision

   • Jurisdiction Internal
3. Provide a narrative overview of the boundary modification request and how the resulting modification would affect likelihood of sustainable management.

   This boundary modification request would modify the boundaries of the Eastern San Joaquin (ESJ) Subbasin and the Tracy Subbasin to align with the City of Lathrop's (City's) City Limit, which is generally contiguous and included within the City's water service area. The current basin boundaries split the City's service area between two groundwater basins, requiring two Groundwater Sustainability Agencies (GSAs) (i.e., the City of Lathrop GSA and the Stewart Tract GSA) to cover the City, and the development and implementation of two Groundwater Sustainability Plans (GSPs). This boundary modification request is founded on a body of evidence that demonstrates that the modification promotes continued sustainable groundwater management. The City has a proven track record of sustainable groundwater management within its service area, and is committed to the sustainable management of groundwater in future. This commitment is articulated in the Memorandum of Understanding (MOU) between the City and Reclamation District (RD) 2062 (i.e., the Stewart Tract GSA) that formalizes their intent to form a joint GSA covering the entire City and to coordinate GSP development within the Tracy Subbasin. Further, the proposed boundary modification will not change conditions in the affected basins or impact the ability of groundwater to be managed sustainably in those basins.

   Attachment(s):
4. List the existing basin(s)/subbasin(s) to be modified by this request

   • 5-022.01 SAN JOAQUIN VALLEY - EASTERN SAN JOAQUIN
   • 5-022.15 SAN JOAQUIN VALLEY - TRACY
5. Provide the proposed name for the new basin(s) or subbasin(s)

C. Initial Notification and Combination of Requests

1. Was an initial notification submitted to the Department?

   Yes
   List of submitted initial notification for the selected basin(s)/subbasin(s).

   Local Agency	Potential Basin(s)/Subbasin(s)
   Eastern San Joaquin County Groundwater Basin Authority	5-022.16 SAN JOAQUIN VALLEY - COSUMNES , 5-022.01 SAN JOAQUIN VALLEY - EASTERN SAN JOAQUIN
   Northern Delta GSA	5-021.65 SACRAMENTO VALLEY - SOUTH AMERICAN , 5-022.01 SAN JOAQUIN VALLEY - EASTERN SAN JOAQUIN , 5-021.66 SACRAMENTO VALLEY - SOLANO
   Lathrop City Of	5-022.15 SAN JOAQUIN VALLEY - TRACY , 5-022.01 SAN JOAQUIN VALLEY - EASTERN SAN JOAQUIN
   	5-021.66 SACRAMENTO VALLEY - SOLANO , 5-021.65 SACRAMENTO VALLEY - SOUTH AMERICAN , 5-022.01 SAN JOAQUIN VALLEY - EASTERN SAN JOAQUIN
   San Luis & Delta-Mendota Water Authority	5-022.07 SAN JOAQUIN VALLEY - DELTA-MENDOTA , 5-022.15 SAN JOAQUIN VALLEY - TRACY
   Brentwood City Of	5-022.15 SAN JOAQUIN VALLEY - TRACY
   	5-022.15 SAN JOAQUIN VALLEY - TRACY , 5-021.66 SACRAMENTO VALLEY - SOLANO
   Brentwood City Of	5-022.15 SAN JOAQUIN VALLEY - TRACY

2. Does this application include a combination of requests?

   No

D. Required Documents for All Modifications

1. A copy of the statutory or other legal authority under which the requesting agency was created with specific citations to the provisions setting forth the duties and responsibilities of the agency.

Attachment(s):

• D1_Lathrop_GSA_Resolution.pdf (149.6kB) Uploaded on 04/19/2018 at 06:48PM

2. A copy of the signed resolution adopted by the requesting agency formally initiating the boundary modification request process.

Attachment(s):

• D2_BBMR Resolution No. 18-4335.pdf (56.8kB) Uploaded on 06/18/2018 at 04:56PM

3. A map of adequate scale (no greater than 1:24,000; e.g., 1:10,000 is not acceptable) showing the proposed modified basin boundary in relation to the existing Bulletin-118 basin boundary and the local agencies that are within or bordering the existing and proposed basin.

Attachment(s):

• Fig1_Proposed_Boundary_with_Local_Agencies.pdf (2.4MB) Uploaded on 04/25/2018 at 10:03AM

4. A GIS shapefile of the proposed modified groundwater basin boundaries. Download Existing B118 basin shape file | DWR Spatial Data Standards

Attachment(s):

• D4_ProposedTracyESJBoundaries.zip (285.6kB) Uploaded on 04/20/2018 at 02:37PM

5. A GIS shapefile of the political boundaries of any affected or adjacent local agency. Download water agency shape file

Attachment(s):

• D5_WaterDistricts_and_CityLimit.zip (426kB) Uploaded on 08/01/2018 at 01:57PM

6. Any information, if necessary, to enable DWR to satisfy the requirements of a responsible agency pursuant to the California Environmental Quality Act.

City of Lathrop has determined that CEQA does not apply to this request due to statutory exemptions included under 14 CCR Section 15378 (b)(5) and 15061 (b)(3). More information is included in the attached draft Notice of Exemption, which was filed with San Joaquin County on 21 May 2018.

Attachment(s):

• D6_CEQA NOE 5-21-18.pdf (45.9kB) Uploaded on 05/30/2018 at 12:52PM

E. General Information

1. Describe the lateral boundaries of the alluvial aquifer or aquifers that form the groundwater basin and the definable bottom of the basin. The description must be in terms that are clear, definite, and sufficiently detailed to allow an authoritative map of the proposed basin boundaries to be plotted using the given description.

Attachment(s):

• E1_Basin Boundary Descriptions.pdf (477.7kB) Uploaded on 04/20/2018 at 02:45PM

F. Notice and Consultation

1. List all local agencies and public water systems affected by the basin(s) modification request.

The following local agency and public water system are affected by the basin modification request: (1) Sharpe Army Depot, and (2) JR Simplot Co Public Water System.

Attachment(s):

• F1_Public Notification Contact List.pdf (289.8kB) Uploaded on 04/20/2018 at 02:45PM

2. Explain the methods used to identify interested local agencies and public water systems in the affected basin(s):

Local agencies and public water systems affected by the modification request were identified using GIS shapefiles of district/water system boundaries (Source: U.S. Bureau of Reclamation MPGIS Service Center in coordination with the California Department of Water Resources) as well as California's Safe Drinking Water Information System. The criteria used for identifying affected agencies or public water systems was to identify those agencies and systems "whose jurisdictional area would, as a result of a boundary modification, include more, fewer, or different basins or subbasins than without the modification" (CCR Title 23 Section 341(c) and (d)). Additional interested parties identified for stakeholder engagement included local agencies and public water systems in the City's Sphere of Influence and Area of Interest, as well as all of the 31 GSAs in the affected basins.

3. Provide information regarding the nature of consultations with affected or interested agencies. Attach and cite any copies of correspondences with local agencies and public water systems and/or any other persons or entities consulted.

A notice letter was sent to the two affected or interested agencies listed above in March 2018 to notify them regarding the potential Basin Boundary Modification Request and soliciting their feedback. To date, letters of support were received from JR Simplot Co, Byron-Bethany Irrigation District, Westside Irrigation District, and the City of Lodi, and are attached hereto. In addition, the City met individually with the following entities for the City's Basin Boundary Modification Request: (1) County of San Joaquin during January and February 2018; (2) Stewart Tract GSA on 20 February 2018 and 7 March 2018; (3) Sharpe Army Depot on 8 March 2018; (4) JR Simplot Public Water System on 15 March 2018; (5) Stockton East Water District during March 2018; and (6) DWR on 16 February and 9 April 2018.

Attachment(s):

• F3_Mailed Notifications to Affected Systems and Agencies.pdf (546.5kB) Uploaded on 04/23/2018 at 11:50AM
• F3_Mailed Notifications to Interested Parties.pdf (13.9MB) Uploaded on 04/23/2018 at 11:50AM
• F3_Email Notification to Affected and Interested Agencies.pdf (374.6kB) Uploaded on 04/23/2018 at 11:50AM
• F3_Letters of Support.pdf (256.1kB) Uploaded on 06/25/2018 at 02:33PM

4. Provide a summary of all public meetings at which the proposed boundary modification was discussed or considered by the requesting agency. Attach and cite any copies of agendas and notices published.

The proposed boundary modification was discussed during the following public meetings: (1) February 14 ESJ Groundwater Authority meeting; (2) March 14 ESJ Groundwater Authority meeting; (3) April 11 ESJ Groundwater Authority meeting; (4) January 29 City Council meeting, and (5) April 9 City Council meeting.

Attachment(s):

• Lathrop CC 29-01-2018_Agenda.pdf (2MB) Uploaded on 04/23/2018 at 11:51AM
• Lathrop CC 29-01-2018_Minutes.pdf (386.4kB) Uploaded on 04/23/2018 at 11:51AM
• Lathrop CC 09-04-2018_Agenda.pdf (2.6MB) Uploaded on 04/23/2018 at 11:51AM
• ESJ GWA 02142018 Agenda.pdf (4MB) Uploaded on 04/23/2018 at 11:51AM
• ESJ GWA 03142018 Agenda and 02142018 Minutes.pdf (3.8MB) Uploaded on 04/23/2018 at 11:51AM
• ESJ GWA 04112018 Agenda and 03142018 Minutes.pdf (4.7MB) Uploaded on 04/23/2018 at 11:51AM

5. Attach a copy of all comments regarding the proposed boundary modification received by the requesting agency and a summary of any responses made by the requesting agency.

The City of Lathrop has received multiple letters of support for its basin boundary modification (see Section F3) and has engaged in numerous conversations with entities in both the Tracy and ESJ Subbasins. The City has also presented at the ESJ JPA meetings and responded to comments in that forum, which are reflected in the meeting minutes (attached to Section F4).

G. General Existing Groundwater Management

1. Explain how sustainable groundwater management exists or could likely be achieved in the basin:

Attachment(s):

• Fig2_LathropWaterRWInfrastructure.pdf (2.5MB) Uploaded on 04/25/2018 at 10:06AM
• Fig3_Lathrop_Hydrographs.pdf (2.7MB) Uploaded on 04/25/2018 at 10:06AM
• Fig4_GICIMA_S2007_2017_Change.pdf (2.1MB) Uploaded on 04/25/2018 at 10:06AM
• G1_Achieving Sustainable Groundwater Management.pdf (503.8kB) Uploaded on 06/11/2018 at 02:24PM

2. Explain how the proposed boundary modification would affect the ability of adjacent groundwater basins to sustainably manage groundwater in those groundwater basins.

As mentioned in Section G1, the City is the third smallest City in San Joaquin County and its groundwater pumping only accounts for about 0.4% of the total groundwater pumping in the ESJ Subbasin. This is supported by recent groundwater modeling conducted under the direction of ESJ JPA (presented during the May 9 ESJ Groundwater Authority Meeting and attached hereto), which showed groundwater pumping and recharging within the Lathrop area is minuscule compared to those of the entire ESJ subbasin. A similar comparison is expected in the Tracy Subbasin. Therefore, the proposed BBMR will not limit the opportunity or likelihood of "(1) Sustainable groundwater management in the proposed basin or subbasin. [¶] (2) Sustainable groundwater management in other basins or subbasins. [¶] (3) Groundwater storage or recharge in the proposed or adjacent basins or subbasins" per CCR Title 23 Section 345.2 (a). As evidenced by their letters of support, agencies in the affected basins recognize the difficulty that the City would otherwise face in managing SGMA compliance in two basins, and support the change to the groundwater basin boundaries. The City has been working with the ESJ JPA member agencies to minimize any potential administrative and financial impact of the basin boundary modification. In the Tracy Subbasin, the City has participated in SGMA discussions as an interested party and in coordination with the Stewart Tract GSA. Familiarity with the SGMA process in the Tracy Subbasin and the partner agencies there will allow the City to smoothly transition its support to SGMA compliance efforts in the Tracy Subbasin. These efforts are evidenced by stakeholder outreach section and meeting minutes in Section F. As such, the proposed BBMR is expected to have no effect on "(4) Coordination of management activities and the sharing of data and information across basin or subbasin boundaries" per CCR Title 23 Section 345.2 (a).

Attachment(s):

• G2_Preliminary ESJ GWA Model Results for Lathrop Area 05092018.pdf (1.5MB) Uploaded on 06/11/2018 at 02:24PM

3. Provide a historical summary of the sustainable management of groundwater levels in the proposed basin(s) or subbasin(s).

Attachment(s):

• Fig3_Lathrop_Hydrographs.pdf (2.7MB) Uploaded on 04/25/2018 at 10:07AM
• Fig4_GICIMA_S2007_2017_Change.pdf (2.1MB) Uploaded on 04/25/2018 at 10:07AM
• Fig5_SJC_Fall2016_GWE.pdf (4.8MB) Uploaded on 04/25/2018 at 10:07AM
• G3_Historical Sustainable Management of Groundwater Levels.pdf (536.6kB) Uploaded on 06/11/2018 at 02:25PM
• G3_Tracy_Summary of Groundwater Conditions.pdf (3.4MB) Uploaded on 04/24/2018 at 05:44PM

4. Discuss potential impacts to state programs resulting from the proposed boundary modification, including, but not limited to, the California Statewide Groundwater Elevation Monitoring (CASGEM), Groundwater Management Plans developed pursuant to AB 3030, Groundwater Sustainability Plans developed pursuant to the Sustainable Groundwater Management Act, any applicable state or regional board plans, and other water management and land use programs.

No state programs will be affected as a result of the proposed boundary modification. San Joaquin County will continue to be the CASGEM monitoring entity for the areas underlaying the City in both affected basins.

H. Local Support

1. Provide any evidence that sufficient information was provided to affected agencies and systems regarding the proposed boundary modification.

As mentioned in Section F3, a notice letter was sent to the affected agency and affected system (i.e. Sharpe Army Depot and JR Simplot Co Public Water System) in March 2018 to notify them regarding the potential basin boundary modification request and soliciting their feedback. In addition, the City met individually with Sharpe Army Depot and JR Simplot Co Public Water System on 8 March 2018 and 15 March 2018, respectively.

Attachment(s):

• F3_Mailed Notifications to Affected Systems and Agencies.pdf (546.5kB) Uploaded on 04/23/2018 at 11:55AM

2. Provide a list of all affected agencies and affected systems that submitted comments and/or documents in support or opposition to the proposed boundary. The agency submitting their support or opposition for a boundary modification must provide a copy of a resolution formally adopted by the decision-making body of the affected agency or system or a letter signed by an executive officer or other official with appropriate delegated authority who represents the agency or system. Attach copies of the resolution and/or signed letter detailing the support or opposition submitted.

A letter of support was received from JR Simplot Co and is attached hereto.

Attachment(s):

• H2_Simplot_Letter_of_Support.pdf (88kB) Uploaded on 05/30/2018 at 12:56PM

3. Provide any evidence that rebuts any opposition to the proposed boundary modification.

No opposition has been expressed with respect to the proposed boundary modification.

I. Hydrogeologic Conceptual Model

1. Principal aquifer units within requested basin.
2. Lateral boundaries of the proposed basin, including:
   1. Geologic features that significantly impede or impact groundwater flow.
   2. Aquifer characteristics that significantly impede or impact groundwater flow.
   3. Significant geologic and hydrologic features and conditions of the principle aquifer units, as appropriate, including information regarding the confined or unconfined nature of the aquifer, facies changes, truncation of units, the presence of faults or folds that impede groundwater flow, or other groundwater flow restricting features.
   4. Key surface water bodies, groundwater divides and significant recharge sources.
3. Recharge and discharge areas within the basin.
4. Definable bottom of the basin or subbasin.

The department may waive this requirement for an internal boundary modification if the requesting agency is able to demonstrate that the proposed boundary modification is unlikely to affect sustainable groundwater management.

It is requested that the Hydrogeologic Conceptual Model requirement be waived for this internal boundary modification. This modification does not introduce any new hydrologic or geologic features that would impact sustainable groundwater management in any of the affected basins. In the City's meeting with DWR on 16 February 2018, DWR recommended that the City not present scientific evidence in support of this jurisdictional request.

L. Technical Studies for All Jurisdictional Modifications

1. A water management plan that covers or is in the immediate vicinity of the proposed basin or portion of the proposed basin and satisfies the requirement of Water Code sections 10753.7(a) or 10727 by attaching one of the following:
   1. An adopted groundwater management plan, a basin wide management plan, or other integrated regional water management program or plan.
   2. Management pursuant to an adjudication action.
   3. One or more technical studies that cover the relevant portion of a basin or subbasin and adjacent areas.

Attachment(s):

• L1_CityofTracyRegional_GWMP_2007.pdf (188.4MB) Uploaded on 04/24/2018 at 05:49PM
• L1_EasternSanJoaquinGWB_GWMP_2004.pdf (7.8MB) Uploaded on 04/24/2018 at 05:45PM

2. A statement of the existing and planned coordination of sustainable groundwater management activities and responsibilities where required.

The City has signed a MOU with RD 2062 to cooperate in forming a multi-agency GSA covering the existing City of Lathrop GSA and Stewart Tract GSA and thereafter in GSP development in the Tracy Subbasin, if the proposed modification is approved by DWR. The MOU was approved by Lathrop City Council on April 9, 2018.

Attachment(s):

• L2_MOU_Lathrop_RD2062.pdf (50.4kB) Uploaded on 04/26/2018 at 01:10PM