D1712508_GPR 8_11 Feb 2020_signedGrant Progress Report
Feasibility Study of Remedial Alternatives to Mitigate Tetrachloroethylene Contamination GA# D1712508
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Work Item Items for Review # Due Date % Of Work Complete Date Submitted
A.1.4 Periodic and Final Site Visits As Needed 100 6/12/2018, 6/26/2018
A.1.5 Pre-, During, and Post-Implementation Photos Complete 100
3/27/2018,
4/7/2018 5/15/2019
A.2.1 GPS Information Complete 100 9/13/2018
A.2.2 Monitoring and Reporting Plan (MRP) Complete 100 1/24/18, 3/27/18, 4/7/18
A.2.2.2 Quality Assurance Project Plan (QAPP) Complete 100 1/24/18, 3/27/18, 4/7/18 A.3.1 List of Approvals, Entitlements or Permits Complete 100 5/31/2018
A.4.1 List of TAC Members, with Roles and Responsibilities, and Affiliations Complete 100 1/25/18 5/15/2019
A.4.2 Summary of Kickoff Meeting Complete 100 5/31/2018
A.4.3 Agendas, Meeting Minutes, and Sign-In Sheets Ongoing 100
5/7/2018, 8/15/2018
11/14/2018 2/15/2019 5/15/2019
8/08/2019 2/15/2020
A.5.1 List of SAG Members Complete 100
5/7/2018,
8/15/2018 5/15/2019
A.5.2.1 Meetings Schedule Complete 100
1/24/18, 3/27/18, 4/5/18, 6/5/2018
9/13/2018
A.5.2.2 Meetings Materials, Summary of Feedback and
Comments, and Sign-In Sheet(s) Ongoing 100
5/7/2018,
8/15/2018 11/14/2018
2/15/2019 5/15/2019 8/08/2019
2/15/2020
A.6.1 Executed MOU (To Be Removed from Amendment 3) January 31, 2019 90 7/13/2018
B.7.1 Draft Pre-Design Investigation Workplan Complete 100 1/24/18, 3/27/18
B.7.2 Final Pre-Design Investigation Workplan Complete 100 4/7/18 B.8.1.1 Well Completion Report Complete 100 12/3/2018
B.8.1.4 Proposed Changes from Approved Workplan Complete 100
6/8/2018 6/12/2018 7/12/2018
B.8.2 Pre-Design Investigation Report Complete 100 1/10/2019 7/20/2019 11/14/2019
B.9.1 Baseline Human Health Risk Assessment Report Complete 100
11/27/2018
1/2/2019 1/9/2019
B.10.1 Feasibility Study Workplan Complete 100 9/13/2018 11/19/2018 12/3/2018
B.11.1 Draft Fate and Transport Modeling Report Complete 100 6/13/2019
11/15/2019
B.11.2 Final Fate and Transport Modeling Report Complete 100 6/28/2019 11/15/2019
B.12.1 Draft Feasibility Study Report February 2020 85
B.12.2 Final Feasibility Study Report April 2020 0
B.13.3.1 Interim Remedial Action Plan April 2020 25
B.14.1.1 Draft Initial Study Checklist August 2019 50
B.14.1.2 Final Initial Study Checklist March 2020 0
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Work Item Items for Review # Due Date % Of Work Complete Date Submitted
B.15.1 Outreach Materials and Web Links April 2020 80
11/15/2018
2/14/2019 5/15/2019 8/8/2019
B.15.2 Workshop Materials, Sign-In Sheets, and Photo Documentation February 2020 80
11/15/2018
2/14/2019 5/15/2019
8/8/2019
EXHIBIT
B
G.1 Progress Reports Quarterly 93.5
6/6/2018,
8/15/2018 11/14/2018 2/15/2019
5/15/2019 8/8/2019 11/15/2019
2/15/2020 G.2 Annual Progress Summaries Annually 0
G.3 NRPI Before Final Invoice N/A
G.4 Draft Project Report April 30, 2020 0
G.5 Final Project Report May 31,2020 0
G.6 Final Project Summary June 30, 2020 0
G.7 Final Project Inspection and Certification Before Final
Invoice 0
Progress Report Narrative
Introduction
During the reporting period (October 1, 2019 through December 31, 2019) project activities focused on: Item 1 - Project Management; Item 4/ Item 5 – Joint Technical Advisory Committee (TAC)/ Stakeholder Advisory Group
(SAG); Item 12 – Feasibility Study and Reporting; and Item 13 – Interim Remedial Action Plan.
Summary of Activities for the Reporting Period Activities performed during this reporting period focused on: Item 1: updates and notifications to the Grant
Manager,; Items 4/5: conduct joint TAC/SAG Meeting 6 on October 21, 2019; Item 12: conduct further cost analysis of potable re-use and discharge options for Alternative 2; refine remedial alternatives and costs for
detailed analysis; develop recommendations for further activities; and Item 13 – Interim Remedial Action Plan (IRAP); develop draft outline and initial content.
This project is about 90% complete.
Summary of Items for Review
List each work item from Exhibit A (Work To Be Performed) in every progress report that are being submitted for review only. Limit narrative descriptions to work performed during the reporting period. Provide, by sub-item
number, a brief description of milestones, successes, and problems or issues encountered during the reporting period.
The following deliverables were submitted via FAAST for review:
A.1.3 Project Schedule Update 5 (11/5/2019). A.4.3 Meeting Materials – Joint TAC/SAG Meeting 6 (10/21/2019)
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Item 1 – Project Management (Cumulative 80% complete) This work item is for the administration of the grant and management of the project.
Notifications (A.1.2) The Grant Manager was provided email notifications for the following events and activities:
• PDI Field Work – Aquifer Testing (7/3/2018, 7/5/2018, 7/10/2018, 7/12/2018);
• South Y Fate & Transport Modeling Analysis/Engineering Evaluation Kick-Off Meeting/Joint TAC/SAG
Meeting 2 (6/11/2018);
• Modeling Analysis/Engineering Evaluation Check-In Call (7/30/2018);
• Joint TAC/SAG Meeting 3 (10/16/2018);
• Joint TAC/SAG Meeting 4 (2/26/2019);
• Joint TAC/SAG Meeting 5 (6/21/2019);
• Public Meeting 2 (7/31/2018);
• Public Meeting 3 (10/23/2018);
• Public Meeting 4 (3/6/2019); and
• Public Meeting 5 (6/26/2019).
• Joint TAC/SAG Meeting 6 (10/21/2019);
Project Schedule (A.1.3). Schedules for the Feasibility Study (FS) were developed and presented to the Grant
Manager on 12/20/2017 (Check-in Call); 1/5/21018 (email from Sachi Itagaki to Tricia Carter); 3/20/2018 (email from I. Bergsohn to T. Carter) The final Detailed Project Schedule (A.1.3) was submitted to the Grant Manager on
3/27/2018 as part of the Final Pre-Design Investigation Workplan (B.7.1).
A Detailed Project Schedule (Schedule Update 1) was completed on 6/5/2018 and uploaded to FASST for review as part of Grant Progress Report 1 (6/6/2018). Schedule Update 1 was later updated and submitted (Schedule
Update 2_09132018) along with a Time Extension Request to the Grant Manager (9/13/2018). The updated Schedule (Update 2_09132018) was later modified in December 2018 and incorporated into the amended
Agreement D1712508-1.
During the second quarter of 2019 the project team developed additional management scenarios for modeling evaluation. During this process, the District requested that DRI investigate whether a low vertical conductivity
layer representing a clay lens could be extended over a broader area in the model, based on interpretations of subsurface sections across the South Y area. The added time for model simulation of additional management
scenarios and model recalibration changed the project schedule for the Pre-Design Investigation Report (B.8.2), the Fate and Transport Modeling Report (B.11.1 and B.11.2), the Feasibility Study Report (B.12.1 and B.12.2),
the Interim Remedial Action Plan (B.13.3.1) and Initial Study Checklists (B.14.1.1 and B.14.1.2). Additional time was also needed for deliberation of interim remedial alternatives by collaborating water districts. For these
reasons and in order to allow sufficient time for technical review of remaining project submittals, the project team prepared a Request for Time Extension to change the project completion date from June 30, 2019 to January 31,
2020. The Request for Time Extension was prepared and submitted to the Grant Manager for review on May 10, 2019. The A-6 Submittal Schedule attached to the Request was revised and resubmitted to the Grant Manger on
May 17, 2019. This schedule was subsequently incorporated into the Amended Agreement D1712508-2. An updated detailed project schedule (Schedule Update 3) based on the estimated due dates used in the revised A-6
Submittal was prepared and was uploaded to FAAST on 08/08/2019.
During the reporting period an updated Request for Time Extension was prepared and submitted to the Grant Manager on November 1, 2019. The Request for Time Extension changed the work completion date from January
31, 2020 to June 30, 2020 and was needed to accommodate the cumulative impact of added work to the South Y Feasibility Study. As part of this request, the Project Director initiated monthly check-in calls with the Grant
Manager to ensure forward progress and completion of the project by the revised completion date. The first of these check-in calls was conducted on December 6, 2019. These calls will continue through the end of the
project. An updated detailed project schedule (Project Schedule Update 5) is being uploaded to FAAST as part of Grant Progress Report 8.
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Site Visits (A.1.4) Site walks for planning of the Pre-Design Investigation were performed by the District on 10/17/17; 10/23/17; 1/16/2018 (along with KJC staff); 1/31/2018; 2/8/2018 and 3/30/2018. Site visits with the
Grant Manager were conducted on June 12th and June 26th, 2018.
Photo-Monitoring (A.1.5) Pre-implementation photos of the site areas considered for the Pre-Design Investigation are provided in Appendix A of the Pre-Design Investigation Work Plan (KJI, 3/23/2018). Photo-monitoring during
the PDI was performed throughout the reporting period. Post-implementation photo monitoring showing site restoration was completed during November 2018.
Photo monitoring logs documenting pre-, during and post-implementation activities for the Pre-Design
Investigation have been compiled and arranged into a series of sixteen (16) photo logs. These photo logs have been uploaded to FAAST (5/15/2019). Item 2 – General Compliance Requirements/Project Effectiveness and Performance (Cumulative 95%
complete)
This work item includes submittal of Global Positioning System (GPS) and Monitoring Plan and Monitoring and Reporting Plan, preparation of the Quality Assurance Project Plan for the Pre-Design Investigation, and
preparation and uploading of all groundwater analytical data collected during the Pre-Design Investigation.
GPS Information (A.2.1) Discrepancies between SWRCB-DFA and GeoTracker GPS survey requirements were clarified and confirmed with the Grant Manager (7/20/2018). A survey report, prepared by G. Phillips, PLS 7936
(Lumos and Associates, Inc., 9/7/2018) including global positioning system (GPS) information for wells used during the Feasibility Study was submitted to the Grant Manger on 9/13/2018.
Monitoring and Reporting Plan (A.2.2) Drafts of the Quality Assurance Project Plan (QAPP) and Monitoring and
Reporting Plan (MRP) were submitted to the Grant Manager and Technical Advisory Committee (TAC) for review and comment on 1/24/2018, as part of the meeting materials for TAC Meeting 1 (1/25/2018). The final deliverable
QAPP (A.2.2.2) and MRP (A.2.2.) were provided to the Grant Manager as part of the draft Final Pre-Design Investigation Workplan (B.7.2), which also described the requirements for the GPS (A.2.1) and Monitoring Plan
(A.2.2). The final approved documents are included in the South Y Pre-Design Investigation Workplan (Agreement D1712508) Final prepared by KJC, 3/23/2018.
Groundwater Analytical Data (A.2.3) A Global Identification Number (GIN) for the project site was received from
the Grant Manager (4/12/2018). A new user account for GeoTracker ESI was created (2/19/2019). A Geo Track ESI (Electronic Submittal of Information) will be created to upload analytical data collected during the PDI. Item 3 – Permitting (Cumulative 100% complete)
This work item consists of obtaining all public agency approvals, entitlements, or permits required for activities part of the Pre-Design Investigation.
Site Access Agreements (A.3.1) for performance of the Pre-Design Investigation were negotiated with Liberty
Utilities (Liberty) and the City of South Lake Tahoe (CSLT). The Liberty access agreement was required for mobilization/demobilization of drilling and water treatment equipment across Liberty property (933 Eloise Avenue).
The Liberty Agreement was executed on 3/5/2018. CSLT required both an Access Agreement and Hold Harmless Agreement for performance of the Investigation on CSLT property (953 Eloise Avenue). The CSLT
Agreements were executed on 4/26/2018.
Permits (A.3.1) required for performance of the Pre-Design Investigation included an El Dorado County Well Construction Permit; and a Road Closure/Obstruction in Right of Way Permit from the CSLT. The Well
Construction Permit Application was submitted on 4/18/2018 and approved by the County on 4/19/2018. The Road Closure/Obstruction in Right of Way Permit was submitted on 4/17/2018 and approved by CSLT on
4/25/2018
The list of Approvals, Entitlements or Permits for the PDI (A.3.1) was uploaded to FAAST on May 31, 2018.
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Item 4 – Technical Advisory Committee (Cumulative 100% complete) This work item consists of establishing a Technical Advisory Committee (TAC), conducting a kick-off meeting, and
holding up to 3 additional TAC conference calls/webcasts. Through the date of this progress report, five TAC conference call/webcasts have been convened.
The TAC Kick-Off meeting (TAC Meeting 1) was convened via conference call on 1/25/2018. From this meeting a
TAC Roster was established and used to inform the final list of TAC Members (A.4.1).
TAC Meeting 2 was convened on June 12, 2018 in the District’s Boardroom, 1275 Meadow Crest Drive, South Lake Tahoe, CA. This was a joint meeting of the TAC /SAG to; discuss the status of the MOU, review project work
items; discuss initial findings of the Test Hole Drilling program and consider design alternatives proposed for test well construction; review the Groundwater Fate and Transport Model and consider preliminary definition of
remedial scenarios. Agenda, Meeting Minutes and Sign-In Sheet for this meeting have been uploaded to FASST (11/14/2018).
TAC Meeting 3 was convened as a Video Conference Call on October 23, 2018. This was a joint meeting of the
TAC /SAG to; discuss the status of project work items; remedial action objectives; remedial scenario definition and planned upcoming project activities. Agenda, Meeting Minutes and Sign-In Sheet for this meeting
have been uploaded to FASST (2/14/2019).
TAC Meeting 4 was convened as a Video Conference Call on February 26, 2019. This was a joint meeting of the TAC /SAG to; review and discuss development and evaluation of management scenarios using the South Y PCE
Model; initial engineering screening of management scenarios; review the Feasibility Study Report outline; discuss proposed changes in response to TAC comments following review of the draft PDI Report; and discussion
of planned upcoming project activities. Agenda, Meeting Minutes and Sign-In Sheet for this meeting were uploaded to FASST (5/15/2019).
TAC Meeting 5 was convened as a Video Conference Call on June 21, 2019. This was a joint meeting of the TAC
/SAG to; review and discuss Feasibility Study (FS) screening of final interim remedial alternatives; receive comment on the draft Fate & Transport Modeling Report; discuss information needs for the FS; notify the
TAC/SAG of the revised project schedule; receive an update of LRWQCB activities in the South Y Area; and notify the TAC/SAG of upcoming project events and action items. Notes from this meeting are in-preparation and
will be uploaded to FASST, along with the agenda and sign-in sheet, during the next reporting period.
During the reporting period, TAC Meeting 6 was convened as a webcast/conference call on October 21, 2019. The meeting was used to discuss the refined alternative layouts and cost items to be used for detailed analysis to
select a preferred remedy during the Feasibility Study; review recommended actions; and confirm feasibility study requirements with the TAC. Meeting materials from TAC Meeting 6 are being uploaded to FAAST as part of Grant
Progress Report 8.
A TAC meeting (TAC Meeting 7) is expected to be scheduled in early March during the next reporting period. This meeting will be focused on receiving comments on the draft Feasibility Study Report.
TAC Members List (A.4.1) The list was uploaded to FAAST on June 8, 2018. This list was updated to include
Stakeholder Advisory Group (SAG) members, which was provided to the Grant Manager as Handout 1a of the meeting materials package for TAC Meeting 2 (6/12/2018).
During the second quarter of 2019, the water systems manager for the Tahoe Keys Water Company changed.
The joint TAC/SAG list was updated and was uploaded to FAAST on 08/08/2019.
Kickoff Meeting (4.2) A second Kickoff Meeting (South Y Fate & Transport Modeling Analysis – Engineering Evaluation Kick-Off)) including the TAC and SAG was convened in the District’s Boardroom on 7/18/2018. The
Modeling Evaluation/FS Kick-Off was used to discuss the F&T Model and approaches for simulating remedial alternatives that may be further evaluated during the Feasibility Study. Copies of the meeting agenda, sign-in
sheets and meeting minutes will be uploaded to FAAST (11/14/2018).
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Item 5 – Stakeholder Advisory Group (Cumulative 100% complete) This work item consists of establishing a Stakeholder Advisory Group (SAG) and conducting SAG meetings to
inform SAG members of Project activities and solicit feedback and comments.
SAG Members List (A.5.1). This list is included on the list of TAC Members on the final TAC Roster (dated 06112018). This list was provided to the Grant Manager as Handout 1a of the meeting materials for TAC Meeting
2 (6/12/2018).
During the second quarter of 2019, the water systems manager for the Tahoe Keys Water Company changed. The joint TAC/SAG list was updated and was uploaded to FAAST on 08/08/2019.
SAG Meetings (5.2). The first SAG meeting was held on December 15, 2017 in South Lake Tahoe, CA. The
meeting minutes and sign in sheet were uploaded to FAAST on 5/7/2018. A first joint meeting of the TAC and SAG was convened on June 12, 2018 in the District’s Boardroom, 1275 Meadow Crest Drive, South Lake Tahoe,
CA (see Item 4 above). Agenda, Meeting Minutes and Sign-In Sheet for this meeting were uploaded to FASST in August 2018. A second joint meeting of the TAC and SAG was convened on July 18, 2018 as part of the South Y
F&T Modeling Analysis- Engineering evaluation Kick-Off (see Item 4.2 above).
A third joint meeting of the TAC/SAG (TAC Meeting 3) was convened as a Video Conference Call on October 23, 2018 (see Item 4 above). An update of South Y Activities was also provided to the Tahoe Valley South Subbasin
(6-5.01) Groundwater Management Plan SAG on 12/21/2018.
A fourth joint meeting of the TAC/SAG (TAC Meeting 4) was convened as a Video Conference Call on February 26, 2019 (see Item 4 above).
A fifth joint meeting of the TAC/SAG (TAC Meeting 5) was convened as a Video Conference Call on June 21,
2019 (see Item 4 above).
A sixth joint meeting of the TAC/SAG (TAC Meeting 6) was convened as a Video Conference Call on October 21, 2019 (see Item 4 above).
Item 6 – Memorandum of Understanding (Cumulative 90% complete)
This work item consists of developing and executing a Memorandum of Understanding (MOU) with the State Board and Regional Board.
Review comments on a working draft of the MOU (11/22/2017) were submitted to the Grant Manager on
12/15/2017. An updated draft of the MOU was received from the Grant Manager on 5/23/2018. A redline version of the updated draft was provided to the Grant Manger on 5/24/2018. The comments were accepted by the Grant
Manager on 5/29/2018.
DFA and LRWQCB comments were incorporated into the updated draft MOU. A final draft was distributed to LRWQCB for review and concurrence (6/20/2018). A copy and original paper copy of the District-signed MOU
was submitted to the Grant Manger on 7/13/2018. Further modifications to the MOU are currently being discussed by regional and state board attorneys. No schedule has been provided for revisions. A critical due date of
February 1, 2019 has been added as a placeholder for Item 6.1 in the Submittal Schedule (A-6).
During the reporting period, information received from the Grant Manager indicated that Item 6 would be deleted from Agreement - Amendment 3. Amendment 3 is expected to be executed during the next reporting period. No
further action is being taken on this item.
Item 7 – Pre-Design Investigation Workplan (Cumulative 100% complete) This work item consists of preparation of a Pre-Design Investigation Workplan which includes a description of the
objectives, tasks, and deliverables; identification of the project area; a description of the test well location and rational; and investigation activities. The draft Final Workplan (B.7.1) was submitted to the Grant Manager on
3/27/2018. The Grant Manager, on behalf of the Department of Financial Assistance (DFA), accepted the South Y
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Pre-Design Investigation Workplan on 4/4/2018. The accepted final Work Plan was uploaded to the FAAST System on 4/7/2018 (B.7.2).
Item 8 – Pre-Design Investigation and Reporting (Cumulative 100% complete)
This work item consists of conducting the Pre-Design Investigation (PDI) in accordance with the Workplan in Item 7 and preparation, submittal, and circulation of a report that summarizes the activities conducted during the Pre-
Design Investigation.
PDI (8.1) Field work activities for the Pre-Design Investigation (B.8) started on 4/29/2018. Activities completed for the PDI included Baseline Groundwater Sampling (5/2/2018); Test Hole Coring and Sampling (5/4/2018); and
Test Well Construction and Development (6/29/2018). Step-Drawdown and Constant Rate aquifer tests were performed and completed during the week of July 8, 2018. All contractor equipment was removed from the site by
August 20, 2018. Investigation-derived Waste was removed from the site for disposal to a non-hazardous waste facility in September 2018.
PDI Changes (8.1.4) Proposed changes to the workplan involved a change in well design to prevent cross-
contamination of water-bearing zones identified in the field and the reduction in duration of the pumping period for the constant test from 72 to 48 hours. Proposed changes in test well design due to subsurface conditions
encountered in the field was brought to the attention of the Grant Manager by email (6/8/2018) and considered during TAC Meeting 2 (6/12/2018). Proposed changes in the pumping period for the constant test were brought to
the attention of the Grant Manger by email (7/12/2018).
PDI Report (8.2). During Q4 2018, a records search identifying the occurrences of private wells throughout the South Y Area was completed. Groundwater level elevation readings were collected from more than twenty (20)
wells on October 25, 2019. These data were reviewed and evaluated to determine groundwater flow directions, horizontal and vertical hydraulic gradients and calculate groundwater velocities during fall (low groundwater)
conditions. These data were incorporated into the Pre-Design Investigation draft technical report. The draft report was completed and submitted to the TAC for review on 1/10/2019. Comments received from the TAC were
reviewed and discussed with LRWQCB and SWRCB staff on February 8, 2019. Changes to the report in response to TAC comments were developed and discussed with the TAC on February 26, 2019 during Project
Meeting 4.
During Q2 2019, a second round of groundwater level elevation readings were collected on May 23, 2019. These data were reviewed and evaluated to determine groundwater flow directions, horizontal and vertical hydraulic
gradients and calculate groundwater velocities during spring (high groundwater) conditions. These data were incorporated into the PDI final technical report. The final report was completed and submitted to the Grant Manger
for approval on July 10, 2019 and was uploaded to FASST (11/14/2019). Item 9 – Baseline Human Health Risk Assessment (Cumulative 100% complete) This work item consists of preparation and submittal of a Baseline Human Health Risk Assessment (BHHRA)
Report that identifies threats to human health as a result of potential exposure to contaminated groundwater in the Project area using existing data and information from the remedial investigation.
BHHRA (9.1) Tasks for a screening level risk assessment to satisfy the BHHRA requirement (A-3.9.) were defined
and submitted to the Grant Manager for consideration (5/22/2018). The scope of work for the proposed screening level risk assessment was accepted by the DFA on 5/30/2018. A draft of the BHHRA was completed and was
submitted to the TAC for review on 11/27/2018. Comments received from the TAC were incorporated into the final BHHRA and submitted to the Grant Manger for approval on 1/2/2019. The final BHHRA report was uploaded to
FASST on 1/9/2019. Item 10 – Feasibility Study Workplan (Cumulative 100% complete) This work item consists of preparation and submittal of a Feasibility Study Workplan.
FS Workplan (10.1). Work during this period consisted of developing a draft of the Feasibility Study Workplan.
The Workplan includes a description of the objectives and the steps necessary to support the technical and cost analyses of alternatives, and support the selection of a cost-effective alternative that will provide prevention
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and/or cleanup of groundwater contamination in the Project area; a list of remedial action objectives to be addressed; and an appropriate requirements analysis to ensure the Project is in compliance with regulatory
requirements. The draft outline was submitted to the TAC. The draft of the Workplan was submitted to the District for comments on June 28, 2018 and submitted to the TAC on September 18, 2018. Comments received from the
TAC were incorporated into a final Feasibility Study Workplan and submitted to the Grant Manager for approval on 11/19/2018. The final FS Workplan was uploaded to FASST on 12/3/2018.
Item 11 - Groundwater Fate and Transport Modeling (Cumulative 100% complete)
This work item consists of conducting Groundwater Fate and Transport Modeling for the purpose of evaluating potential implementation projects that will prevent or cleanup groundwater contamination; submittal of a Modeling
Report; and addressing comments received on the Modeling Report.
F&T Modeling (11.1) Work to add a fate and transport (F&T) model to the District’s existing groundwater model was initiated with the University of Nevada Reno- Desert Research Institute (DRI) on October 20, 2016 (Item
B.11). Conference call/project updates on the development of the F&T Model were provided to stakeholders on 12/7/2016 and 4/5/2017. Work to-date includes planning and development of a local 4 layer model using
MODFLOW and MT3D covering the estimated plume extent, definition of simulated time periods, model inflows/outflows, recharge, boundary conditions, and hydraulic parameters, An initial matrix of remedial
alternatives for modeling analysis was also developed. The model hydraulic conductivity field was updated in accordance with changes to the regional groundwater model. Minor PCE model calibration was completed to
reflect updated (2017) PCE concentration data. A draft report describing model development, assumptions and calibration was prepared and submitted to the Project Director for review. A copy of the draft report was provided
to the TAC and Grant Manager in preparation for the model analysis/engineering evaluation kickoff meeting in July 2018.
DRI used the South Y PCE Model to simulate a variety of management scenarios as defined by the TAC and
project engineering team. A Kick-Off Meeting with DRI and engineering design consultant was convened on July 18, 2018 to discuss the F&T Model and approaches for simulating remedial alternatives. Copies of the meeting
agenda, sign-in sheets and meeting minutes were uploaded to FAAST (11/14/2018). In follow-up to this meeting, a presentation was developed outlining the results of the simulations discussed with the TAC during a conference
call on August 9, 2018.
During the first quarter of 2019, DRI answered questions from Kennedy Jenks Consultants concerning model simulation assumptions and results, providing additional model detail and running additional best- and worst-case
scenario model simulations (4B, 4C, 5A/5B, 5A2/5B2, 6A/6B and 6A2/6B2) to evaluate new replacement well simulations and targeted pumping using wells with wellhead treatment for plume control and removal.
District staff requested that DRI perform extra work to evaluate whether an area of very low vertical conductivity
between layers 1 and land 2 can be extended over a broader area than currently represented in the South Y PCE Model. This very low vertical conductivity layer represents a clay lens identified in subsurface sections across the
South “Y” area that inhibits the vertical migration of PCE. As such this very low vertical conductivity layer has a significant bearing on the movement and distribution of PCE simulated using the South Y PCE Model. DRI was
able to successfully recalibrate the South Y PCE Model with the following changes from the previous model versions used for evaluating management scenarios.
• Adjusted screened intervals at LBWC 4 and TKWC 2
• Added expanded clay lens acting as low vertical conductivity zone
• Decreased longitudinal dispersivity to 40m
• Increased vertical dispersivity ratio to 0.015
• Increased transverse dispersivity ratio to 0.6 in layers 1 and 2
• Increased decay half-life to 17 years in layers 1 and 2
• Decreased source term by 30% during years LTLW is in operation
The recalibrated PCE model was used to run simulations under best and worst-case assumptions of the final
three interim remedial alternatives selected for engineering analysis identified as Alternative 1 - Base; Alternative 2 - Targeted Pumping; and Alternative 3 – Conversion to surface water. The draft Fate & Transport Modeling
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Report was completed and submitted to the TAC for review on June 13, 2019. The findings of the final alternatives modeling were presented during joint TAC/SAG Meeting 5. TAC review comments received on the
draft Modeling Report were reviewed and addressed in the final Modeling Report submitted to the Grant Manger for approval on June 28, 2019.
During the third quarter of 2019, DRI prepared and submitted an addendum to the final Modeling Report. The
addendum presented the modeling evaluation of two additional options based on the Targeted Pumping (Alternative 2) scenario, as follows: Option1 – using LBWC 5 as lead well; and Option 2 -adding LBWC4R as a
new extraction/replacement well at the LBWC 4 site, under best- and worst-case modeling assumptions. In addition to providing detailed results of four additional modeling scenarios, the addendum included particle
tracking analysis of several potential sentinel well sites and detailed responses to stakeholder comments received after the final Modeling Report was submitted to the Grant Manager. The Fate and Transport Modeling Report
Addendum was submitted to the Grant Manager for approval on September 10, 2019. The draft (B.11.1) and final (B.11.2) Fate and Transport Modeling Reports and Addendum were uploaded to FAAST on 10/02/2019.
Item 12 – Feasibility Study and Reporting (Cumulative 90% complete)
This work item consists of evaluating and developing interim remedial alternatives that prevent or cleanup contamination of groundwater that serves or has served as a source of drinking water based on the Pre-Design
Investigation Report.
During the first quarter of 2019, further coordination/development of remediation alternatives with modeling and PDI data including several webcast/calls within Kennedy/Jenks, a webcast/call between Kennedy/Jenks and
South Tahoe PUD on 1/25/2019, and a webcast/call DRI on 1/7/2019 and 2/4/2019, review of information provided by DRI, and under as-needed services, continued refinement of pumping/remediation scenarios for
groundwater modeling and continued evaluation of groundwater modeling results for use in developing remedial alternatives.. A draft outline for the Feasibility Study was submitted to the District in January 2019. Calls to obtain
input on alternatives were conducted on 3/28/2019 with LBWC and TKWC.
During second quarter of 2019, the final three interim remedial alternatives were developed, considered and refined by the water purveyors (District, LBWC and TKPOA). Information for identifying infrastructure needs and
associated costs for each alternative were presented during joint TAC/SAG Meeting 5. Available water production data was evaluated using Title 22 criteria to determine surface water treatment sizing capacity. Infrastructure
needs and associated costs for each alternative were started and are planned to be completed during the next reporting period.
On July 24, 2019, the District received notification from TKPOA, concerning the use of TKWC Wells in Alternative
2, requiring the removal of the TKWC wells from this alternative. Options for revisions to Alternative 2 were considered and additional modeling and engineering work to evaluate these options were performed. Email
notification of the need to modify Alternative 2 was provided to the Grant Manger on July 26, 2019.
During the third quarter of 2019, work continued to refine Alternatives 2 and 3 such as addition of extraction well and treatment using existing air stripper in Alternative 2, and intake and site layout options for Alternative 3,
development of sizing criteria, and evaluating information from the water purveyors to establish the Alternative 1 (Base Treatment) operations and maintenance costs. Alternative 2 and Alternative 3 conceptual plans were
presented to stakeholders for consideration during a webcast/conference call on 09/09/2019. Based on calls with water agencies on September 9, 2019 and September 17, 2019 and a call with the State Water Resources
Control Board on September 19, 2019, Alternative 2 was updated to include two additional treatment options for PCE removal, Alternative 2 was updated to use completely new transmission pipelines, and costs were further
refined based on this initial feedback. Additional work included further development of Sections 1-8 of the FS Report.
During the reporting period, work focused on refining layouts and cost items for detailed analysis of alternatives to
select a preferred remedy for the feasibility study. This included further cost analysis to compare costs between potable re-use and disposal options developed for Alternative 2. This entailed completing a detailed review of
Division of Drinking Water (SWRCB-DDW) requirements under the draft 97-005 process for permitting extremely impaired water sources (March 25, 2015). Findings from this analysis were incorporated into the feasibility study
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and discussed with the TAC during TAC Meeting 6. Other recommended activities for inclusion in the draft Feasibility Study Report were also developed.
Item 13 – Interim Remedial Action Plan (Cumulative 25% complete)
This work item consists of developing an Interim Remedial Action Plan (IRAP) based on the Feasibility Study that will lead to the implementation of the preferred remedy and prevent or cleanup contamination of groundwater that
serves or has served as a source of drinking water.
During the reporting period, work consisted of developing the outline and initial content of the IRAP. This included initial development of activities, project schedule, and finance and governance considerations relevant to project
implementation.
Item 14 – Environmental Compliance (Cumulative 50% complete) This work item consists of documentation required under the California Environmental Quality Act (CEQA) for the
proposed implementation project, including preparation of a draft initial study checklist, identification of mitigation measures and mitigation costs as required under CEQA for the alternatives evaluated in the Feasibility Study
Report.
A Notice of Exemption (NOE) for performance of the Pre-Design Investigation was prepared and filed with the County Clerk, County of El Dorado on March 5, 2018. The NOE was posted by the County Clerk from March 6,
2018 through April 9, 2018.
During the second quarter of 2019 environmental checklists (CEQA Appendix G; and TRPA Initial Environmental Checklist) and project descriptions were prepared for Alternative 3 and submitted to the Project Director for initial
review. These checklists and project descriptions will be refined and further developed during the next reporting period.
Item 15 – Public Outreach (Cumulative 75% complete)
This work item consists of developing outreach materials including flyers, posters, brochures, and advertisements, and updates of the Recipient’s website and associated social media web pages to include Project progress and
outcomes and conducting at least one (1) public workshop. Through the date of this progress report, five public workshops have been convened.
The schedule for public workshops to inform the public on the progress of the Feasibility Study was updated and
incorporated into Schedule Update 2_09132018. A fourth workshop was added to the schedule included in Agreement D1712508 Amendment 1.
The first public meeting concerning the FS was convened on 2/7/2018 at the CSLT Council Chambers, South
Lake Tahoe, CA (B.15). Notification of this meeting was provided to the TAC during TAC Meeting 2 on 6/12/2018. The purpose of this meeting were to inform the public and answer questions about current activities being
pursued by the water purveyors in response to this contamination; an update of LRWQCB activities and preliminary findings of the Pre-Design Investigation A Flyer and press releases announcing the meeting were
distributed; a Fact Sheet, FAQ and concerning the PCE contaminant problem were developed and posted on the District’s website (http://stpud.us/groundwater). A video recording of the meeting along with a copy of the
presentation are also posted on the website. A copy of the sign-in sheet from this meeting is available from the Project Director.
The second public meeting concerning the FS was convened on 8/8/2018 at the CSLT Council Chambers, South
Lake Tahoe, CA (B.15). Notification of this meeting was provided to the TAC during TAC Meeting 2 on 6/12/2018. The purpose of this meeting were to inform the public and answer questions about the current (2018) extent of
the contaminant plume; the approaches being pursued by the water purveyors in response to this contamination; and to present initial (preliminary) findings from the Pre-Design Investigation. A flyer and press release
announcing the meeting were distributed; a Fact Sheet, FAQ and concerning the PCE contaminant problem were developed and posted on the District’s website (http://stpud.us/groundwater). A video recording of the meeting
along with a copy of the presentation are also posted on the website. A copy of the sign-in sheet from this meeting is available from the Project Director.
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A third public meeting concerning the FS was convened on 11/7/2018 at the CSLT Council Chambers, South
Lake Tahoe, CA (B.15). Notification of this meeting was provided to the TAC during TAC Meeting 3 on 10/23/2018. The purpose of this meeting were to inform the public and answer questions about the current
(2018) extent of the contaminant plume; the approaches being pursued by the water purveyors in response to this contamination; and the planned activities for the Feasibility Study. A flyer and press release announcing the
meeting were distributed; a Fact Sheet, FAQ and concerning the PCE contaminant problem were developed and posted on the District’s website (http://stpud.us/groundwater). A video recording of the meeting along with a copy
of the presentation are also posted on the website. A copy of the sign-in sheet from this meeting is available from the Project Director.
A fourth public meeting concerning the FS was convened on 3/6/2019 at the CSLT Council Chambers, South
Lake Tahoe, CA (B.15). Notification of this meeting was provided to the TAC during TAC Meeting 4 on 2/26/2019. The purpose of this meeting were to inform the public and answer questions about the South Y PCE Model used
to evaluate different clean-up scenarios to address the South Y Plume. Preliminary findings and results from the modeling evaluation were presented to the public. A flyer and press release announcing the meeting were
distributed; a Fact Sheet, FAQ and concerning the PCE contaminant problem were developed and posted on the District’s website (http://stpud.us/groundwater). A video recording of the meeting along with a copy of the
presentation are also posted on the website. A copy of the sign-in sheet from this meeting is available from the Project Director.
A fifth public meeting concerning the FS was convened on 6/26/2019 at the CSLT Council Chambers, South Lake
Tahoe, CA (B.15). Notification of this meeting was provided to the TAC during TAC Meeting 5. The purpose of this meeting were to inform the public and answer questions about the final three interim remedial alternatives
selected for further engineering evaluation for the FS. A press release announcing the meeting was distributed. A video recording of the meeting along with a copy of the presentation are also posted on the website. A copy of
the sign-in sheet from this meeting is available from the Project Director.
A sixth public meeting to explain the detailed analysis of remedial alternatives to select a preferred remedy is anticipated during the next reporting period. Notifications of this meeting will be provided to the GM and Joint
TAC/SAG. Summary of Items in Progress List each work item from Exhibit A (Work To Be Performed) in every progress report that are not completed nor
being submitted for review. Narrative descriptions should include work performed during the entire grant up to completion. Provide a brief description of milestones, successes, and problems or issues encountered.
Item 1 – Project Management
Work to be performed;
Continue to provide technical and administrative services;
Notify the Grant Manager of upcoming events (A.1.2);
Joint TAC/SAG Meeting 5 (7/18/2018); - completed
Public Meeting 3 (11/8/2018); - completed
Joint TAC/SAG Meeting 4, (October 2018) - completed
Public Meeting 3, (October 2018) – completed
Joint TAC/SAG Meeting (12/21/2018 – completed)
Joint TAC/SAG Meeting (2/26/2019 – completed)
Public Meeting 4 (3/6/2019 - completed)
Maintain and update the Project Schedule, as needed (A.1.3);
Complete Pre-Design Investigation site photo-monitoring and submit to the Grant Manager (A.1.5);
Item 2 – General Compliance Requirements/Project Effectiveness and Performance
Work to be performed;
Conduct well survey and submit GPS data for monitoring locations (A.2.1) - completed
• Prepare a GeoTrack ESI for upload of analytical data collected during the PDI (Item A.2.3)
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Item 3 – Permitting Work to be performed:
Submit list of Approvals, Entitlements or Permits to Grant Manager (A.3.1) - completed Item 4 – Technical Advisory Committee Work to be performed:
Submit Summary of Joint TAC/SAG Meeting 2 (6/12/2018) (A.4.2) - completed
Submit Summary of South Y F&T Modeling Analysis – Engineering Evaluation Kick-Off (7/18/2018)
(A.4.2); - completed
Develop meeting materials and schedule Joint TAC/SAG Meeting 3 (10/23/2018) (A.4.3) – completed
Submit Summary of Joint TAC/SAG Meeting 3 (10/23/2018) (A.4.2) – completed
Develop agenda and meeting materials for Joint TAC/SAG Meeting 4 (2/26/2019) (A.4.3) – completed
Submit Summary of Joint TAC/SAG Meeting 4 (2/26/2019) (A.4.2) – completed
Develop agenda and meeting materials for Joint TAC/SAG Meeting 5 (6/21/2019) (A.4.3) – completed
Submit Summary of Joint TAC/SAG Meeting 5 (6/21/2019) (A.4.2) – completed
• Submit Summary of Joint TAC/SAG Meeting 6 (10/21/2019) (A.4.2) – in-preparation
• Develop meeting materials and schedule Joint TAC/SAG Meeting 7 (A.4.3) – in-preparation
• Alert the Grant Manger of any changes to the Joint TAC/SAG Meeting Schedule (A.4.2) – on going
Item 5 – Stakeholder Advisory Group
Work to be performed;
Submit Summary of South Y F&T Modeling Analysis – Engineering Evaluation Kick-Off (7/18/2018)
(A.4.2); - completed
Submit Summary of Joint TAC/SAG Meeting 3 (10/23/2018) (A.5.2.2) – completed
Submit agenda and meeting materials for Joint TAC/SAG Meeting 4 (A.5.2.1) – completed
Submit agenda and meeting materials for Joint TAC/SAG Meeting 5 (A.5.2.1) – completed
• Submit Summary of Joint TAC/SAG Meeting 6 (10/21/2019) (A.5.2.1) – in-preparation
• Develop meeting materials and schedule Joint TAC/SAG Meeting 7 (A.5.2.1) – in-preparation
• Alert the Grant Manger of any changes to the Joint TAC/SAG Meeting Schedule (A.5.2.1) – on-going
Item 6 – Memorandum of Understanding Work to be performed;
• Waiting-on GM removal of Item 6 (A.6.1) from Amendment 3 Item 7 – Pre-Design Investigation Workplan
Work to be performed:
Draft Pre-Design Investigation Workplan (B.7.1) – completed 3/27/2018;
Final Pre-Design Investigation Workplan (B.7.2) - completed 4/7/2018.
Item 8 – Pre-Design Investigation and Reporting Work to be performed:
Submit proposed changes from approved Workplan to TAC for comment and Grant Manager for approval
(B.8.1.4) - completed
Submit a Well Completion Report for the Test Well (B.8.1.1)
Prepare a draft Pre-Design Investigation Report and submit to the TAC and SAG for comment (B.8.2)
• Address comments and submit a final Pre-Design Investigation Report to the Grant Manager for approval (B.8.2) – completed 7/10/2019
Item 9 – Baseline Human Health Risk Assessment
Work to be performed:
Prepare a draft Baseline Human Health Risk Assessment (BHHRA) Report (B.9.1)
Submit draft BHRRA Report to TAC for review;
Address comments and submit a final BHHRA Report to the Grant Manager for approval (B.9.1)
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Item 10 – Feasibility Study Workplan
Work to be performed;
Prepare a draft Feasibility Study (FS) Workplan (B.10.1); - completed (6/28/2018)
Submit draft FS Work Plan to TAC for review (B.10.1); - completed (9/18/2018)
Address comments and submit final FS Work Plan to the Grant Manger fort approval (B.10.1)
Item 11 - Groundwater Fate and Transport Modeling
Work to be performed:
Conduct Fate and Transport Modeling (B.11.1) – completed
Submit the draft Modeling Report (B.11.2) to the TAC for comment
Submit the final Modeling Report (B.11.2) to the Grant Manger for approval
Address any comments received from the TAC and Grant Manger (11.3) – completed
Conduct additional modeling for evaluation of revisions to Alternative 2 – completed
Item 12 – Feasibility Study and Reporting
Work to be performed:
Prepare a draft outline for the Feasibility Study Report (B.12.2)–completed
• Complete a summary of the project area’s history (B. 12.2.1) – in-preparation
• Complete a summary of the nature and extent of the constituents of concern (B. 12.2.2) – in-preparation
• Complete a summary of contaminant properties and transport based on soil and aquifer properties (B. 12.2.3) - in-preparation
Define Remedial Action Objectives (B. 12.2.4) – completed
Describe Remedial Action Alternatives (B.12.2.5) – completed
Prepare a Baseline Health Risk Assessment Report (B.12.2.6) – completed
• Remedial Action Alternatives evaluation (B. 12.2.7)- on-going
• Prepare total life-cycle cost estimates (B. 12.2.8)- on-going
• Describe rationale for selection of recommended alternative (B. 12.2.8)- on-going
Item 13 – Interim Remedial Action Plan
Work to be performed:
• Prepare a draft Interim Remedial Action Plan (IRAP) – in-preparation
• Submit the draft IRAP to the TAC for review and GM for approval
• Circulate the draft final IRAP to the SAG and interested parties
• Respond to agency and interested party comments
• Finalize the IRAP Item 14 – Environmental Compliance Work to be performed:
• Prepare draft Initial Study Checklist (B.14.1.1) for Alternative 2 – on-going
• Address PD comments on draft Initial Study Checklist (B.14.1.1) for Alternative 3 – on-going Item 15 – Public Outreach Work to be performed:
Develop outreach and workshop materials for Public Meeting 2 (B.15.1); - completed
Submit copies of sign-in sheets, workshop materials and photo documentation for Public Meeting 2
(8/8/2018) to the Grant Manager (B.15.2).-completed
Develop outreach and workshop materials for Public Meeting 3 (B.15.1);-completed
Submit copies of sign-in sheets, workshop materials and photo documentation for Public Meeting 3 (11/7/2018) to the Grant Manager (B.15.2).-completed
Develop outreach and workshop materials for Public Meeting 4 (B.15.1);-completed
Submit copies of sign-in sheets, workshop materials and photo documentation for Public Meeting 4
(3/6/2019) to the Grant Manager (B.15.2) – completed
Submit copies of sign-in sheets, workshop materials and photo documentation for Public Meeting 5 (6/26/2019) to the Grant Manager (B.15.2) – completed.
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• Develop outreach and workshop materials for Public Meeting 6 (TBD)
• Submit copies of sign-in sheets, workshop materials and photo documentation for Public Meeting 6 (TBD) to the Grant Manager (B.15.2)
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Additional Instructions
• Clearly label each item for review with work-item number.
• If a document is not a grant item for review, do not include under the list of items for review or in the narrative.
Label as “Extra Item for Review” and provide one copy.
• Number all pages including pictures, laboratory data, diagrams, etc.