1. Ground-Level Monitoring Committee Meeting
December 1, 2016

2. Agenda Siting Study for the Pomona Extensometer Facility
Background and Objectives
Methods
Results and Conclusions
Recommendations and Next Steps
GLMC Next Steps
Review and comment on this report
Upcoming meetings and reports

3. Data Gaps from the Hydrogeologic Conceptual Model
Background
Data Gaps from the Hydrogeologic Conceptual Model
Lack of deep, high-resolution lithologic data
Installation of two boreholes (shallow and deep) and each equipped with a dual-nested piezometer and an extensometer
Lack of depth-specific piezometric data
New installation of pressure transducers in existing wells
New piezometers in areas of greatest observed subsidence
Lack of depth-specific aquifer-system deformation data
Extensometer installation and conduct controlled aquifer-system stress testing and passive monitoring
Lack of knowledge of the pre-consolidation stress within the compacting intervals of the aquifer-system
Extensometer installation
Conduct controlled aquifer-system stress testing

4. Target Locations for the Pomona Extensometer

5. Dual-Nested Cable Extensometer Schematic

6. Background Design and Install the PX: Select a location for the PX
Perform siting study to identify and rank potential sites
Discuss construction and permanent easements with owners
Conduct environmental review pursuant to CEQA
Select a site for the PX
Prepare technical specifications for PX
Prepare bid package and incorporate technical specifications
Acquire construction and permanent easements
Conduct bidding process, and select and retain drilling contractor
Construct and test PX; begin monitoring
Prepare completion report for the PX

7. Methods Develop criteria to identify and rank potential sites
Site-Identification Criteria
Parcel-Ranking Criteria
Acquire and compile information necessary to apply the criteria
Utilize ArcGIS to apply the Site-Identification and Parcel-Ranking criteria
Add ranking from each criterion to calculate total rankings

8. Site-Identification Criteria
Must be within Target Areas
Must have undeveloped space sufficient for construction and operation.
Site must not have overhead obstructions that may prevent safe rig access and operation
Site must be at least 1,000-ft from active production well.
Site must be at least 300-ft from heavy-traffic streets and 50-ft away from light-traffic streets.
Site must be required distances from infrastructure and facilities according to the DWR Bulletin and Water Well Standards Bulletin
Must not have unresolvable environmental challenges.

9. Target Locations for the Pomona Extensometer

10. for the Pomona Extensometer
Target Area A
for the Pomona Extensometer

11. for the Pomona Extensometer
Target Area B
for the Pomona Extensometer

12. Parcel-Ranking Criteria
Parcel Ownership
Publically owned (Cities of Pomona or Claremont)
Publically owned (other)
Privately owned
Proximity to maximum land subsidence (Mar-11 to Jan-16).
Inside ft contour
Between ft and ft contours
Outside the ft contour
Distance to nearest heavy-traffic street
More than 1,000-ft
500-1,000-ft ft

14. Potential Locations for the PX
Parcels A and B

15. Recommendations
Further evaluate top-ranked sites to determine the ultimate location of the PX:
Parcels A and B were the highest ranked parcels.
Parcels C, D, and E are acceptable alternatives.

16. Next Steps Design and Install the PX: Select a location for the PX
Perform siting study to identify and rank potential sites
Discuss construction and permanent easements with owners
Conduct environmental review pursuant to CEQA
Select a site for the PX
Prepare technical specifications for PX
Prepare bid package and incorporate technical specifications
Acquire construction and permanent easements
Conduct bidding process, and select and retain drilling contractor
Construct and test PX; begin monitoring
Prepare completion report for the PX

18. Schedule and Milestones – PX Siting Study
December 22, 2016
Committee submits comments on the PX Siting Study tech memo
Tara Rolfe
Andy Malone

19. Next Steps – Ground-Level Monitoring Committee
Finalize Initial Hydrologic Conceptual Model and Monitoring and Testing Program for the Northwest MZ‐1 Area Report
Draft Develop and Evaluate the Baseline Management Alternative (BMA)
Draft Develop and Evaluate the Initial Subsidence- Management Alternative (ISMA)
Scope and budget for the Initial Monitoring Program expansion
Draft Technical Specifications for the PX