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HomeMy WebLinkAboutResolution - 2013-R0037 - Amendment To Agreement - Terracon Consultants - 01_31_2013Resolution No. 2013-R0037 January 31, 2013 Item No. 5.12 RESOLUTION BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF LUBBOCK: THAT the Mayor of the City of Lubbock BE and is hereby authorized and directed to execute for and on behalf of the City of Lubbock, an Amendment to a Professional Services Agreement, by and between the City of Lubbock and Terracon Consultants, Inc., and all related documents. Said Amendment is attached hereto and incorporated in this Resolution as if fully set forth herein and shall be included in the minutes of the Council. Passed by the City Council this January 31, 2013 TTEST: Garza, City Secretary APPROVED AS TO CONTENT: I mde44�' i G' Zjz�c/ - Marsha Reed, P.E., Chief Operating Officer APPROVED AS TO FORM: A Sims, Assi ant ity Attorney Res -Amend, Prof Srvs Agrmnt-Terracon Consultants, Inc 1.7.13 , 2013. Resolution No. 2013-R0037 STATE OF TEXAS COUNTY OF LUBBOCK FOURTH AMENDMENT TO PROFESSIONAL SERVICES AGREEMENT This Fourth Amendment to Professional Service Agreement is entered into this 31 s t day of January , 2013 between the City of Lubbock, a Texas municipal corporation (hereinafter called "the City") and Terracon Consultants, Inc. (the 'Engineer"), a Delaware corporation. WHEREAS, the Engineer and the City have previously entered into certain Professional Service Agreement dated November 20, 2008, Resolution No. 2008.R0453 (Contract #8773) (hereinafter called "the Agreement"); and WHEREAS, the Engineer and the City previously amended the Agreement on January 26, 2012, Resolution No. 2012-RO041; and WHEREAS, the City and the Engineer hereby desire to further amend said agreement. NOW THEREFORE, the City and the Engineer hereby agree to amend the Agreement as follows: 1) That "Attachment A" of the Agreement is hereby substituted and replaced with "Attachment A1.2013" that is that is attached hereto. 2) This amendment to the Agreement shall be effective upon execution. The remainder of the Agreement shall remain in full force and affect except as changed herein. IN WITNESS WHEREOF, the parties have executed this Agreement by their duly authorized representatives as of the date first written above. CITY OF LUBBOCK RI - . MAYOR ATTEST: JQ'g 0 -de c , -C — Rebe ca Garza, City Attorney APPROVED AS TO CONTENT: A4 &/j Marsha Reed, P.E., Chief Operating Officer APPROVED AS TO FORM: Amy L. . A ' a r ttorney TERRACON Name: '-re�h e vudl 'r Aa�w—/ ple- Citle: �'6 -rr_. ATTACHMENT A Described below is the scope of work and associated fees for Terracon to provide consulting services to the City of Lubbock for the Hancock Land Application Site (HLAS) and Lubbock Land Application Site (LLAS). This exhibit outlines specific tasks, estimated project hours, budgets, and not to exceed amounts for Terracon to complete the anticipated scope of work. Terracon's fee schedule that will be used for negotiating fees for Additional Services not included in this scope of work is also included in this exhibit. Specific tasks to allow Terracon to review site data, to assist the City to define project strategies, revise the Remediation Work Plan, and interface with the Texas Commission on Environmental Quality (TCEQ) are included in this scope of work. In addition, Terracon has included tasks to manage project data and prepare state mandated routine annual monitoring reports for the HLAS and LLAS for submission to the TCEQ in May 2009. Additional tasks (`Additional Services") such as static water level recovery program assistance, off -site groundwater monitoring, aquifer testing, investigation of deep-seated nitrogen, and development of a revised groundwater model may be negotiated as Additional Services and may be added to this Agreement by amendment hereof. Task I — Project Review and Strategic Planning This task includes the review of project documents, site visits, strategic planning with the City of Lubbock, and interfacing with regulators. Task 1.1— Document Review Terracon will review project documents for the HLAS and LLAS, including: ■ Agreed Order with the Texas Water Commission; ■ Texas Pollution Discharge Elimination System (TPDES) permits and applications; ■ Groundwater Level Measurement Quality Assurance Plan; ■ Groundwater Sample Collection Quality Assurance Plan; ■ Recent Annual Reports for HLAS and LLAS: ■ Previous soil and water monitoring and gauging data and data management; ■ Boring and well logs; • Rcmediation work plans; ■ Groundwater model development documentation and reports; ■ Previous correspondence with the TCEQ; and, ■ Pertinent documentation provided by the City of Lubbock relating to farm and wastewater operations. Task 1.2 — Site Visit and Strategic Plannitte 1lfeetin.Q 'Terracon will tour the FILAS and LLAS sites to review wastewater, farm, and remediation operations. Auer visiting the sites, Terracon will meet with City of Lubbock personnel to !'age I t of 18 discuss strategic planning for the LLAS. The strategic planning session(s) will address both short-term and long-term planning. The short-term planning discussions will include the collaborative and conflicting activities for the wastewater operations, farming operations, and remediation activities at the LLAS. The long-term planning discussions will include the wastewater development and water use planning and the beneficial use of the property. The long-range planning will also be used to develop a monitoring, remediation, and closure strategy for the LLAS. The site tours and strategic planning mceting(s) with the City of Lubbock will be performed in two days. Task 1.3 — Afeetin.Qs with Reaulators Terracon will assist the City of Lubbock with their discussions with the TCEQ. The LLAS is currently operated, monitored, and remediated pursuant to a 1989 Agreed Order with the Texas Water Commission (TWC, predecessor to TCEQ). The Agreed Order stipulates and/or requires, among other things,: ■ Operations and maintenance pursuant to'I'WC Permit No. 10353-02, ■ Implement irrigation practices to prevent ponding of irrigation water on the farm and construct tailwater control facilities to prevent the discharge of wastewater from the farm, ■ Continue proper equipment operations to determine application rates and maintain accurate records of the volume of effluent applied as irrigation water, ■ No discharge of wastewater effluent to unlined ponds (excluding tailwater control facilities), ■ Maintain 5 feet of freeboard in tailwater control facilities at all tunes, ■ Submit an interim plan to preclude further recharge of irrigation water to the aquifer to the TWC within 90 days, • Adhere to the groundwater remediation plan that was approved by the TWC on August 25, 1989, which includes monitoring of dissolved constituents in the groundwater, ■ Submit annual reports to the TWC that discusses the progress of the project for the duration of the groundwater remediation project, ■ Submit plan for a comprehensive industrial monitoring program that includes a revised industrial waste ordinance to the TWC within 90 days, ■ Submit semi-annual reports of the industrial monitoring program to the TWC, which includes the impact of the program to the Southeast Water Reclamation Plant (SEWRP; formerly South East Wastewater "Treatment Plant), Terracon understands that the City of Lubbock Submitted a 'TPDES Discharge Permit amendment/renewal in August 2008 for the wastewater treatment facilities. Terracon will assist the City of Lubbock in determining whether it will be more advantageous to seek permission from the TCEQ to remediate the LLAS under the operating permits and to bring the Agreed Order to a closure or to continue the remediation process under the Agreed Order. Terracon will assist the City and their attorneys with identifying regulatory programs and pitfalls of potentially ceding their grandfathered status, and assist the City with the regulatory interactions with the I'CEQ. This proposal includes time for senior project officers to meet with the City of Lubbock 11age 12 of 18 and their attorneys by phone and to accompany the City of Lubbock at a meeting with the TCEQ in Austin. Task 1.4 —Revised Remediation Work Platt Arcadis G&M prepared a Revised Remediation Work Plan for the LLAS in November 2002. The work plan references the Groundwater Level Quality Assurance Plan, the Groundwater Sample Collection Quality Assurance Plan, the Development of a Groundwater Flow and Solute Transport Model, the nutrient management water balance model, the potential pilot testing of in - situ nitrate remediation technologies, and operational aspects of the groundwater pumping system. Terracon will prepare an updated Revised Remediation Work Plan that: ■ States remediation objectives; ■ Updates and revises the groundwater sampling plan; ■ Describes an aquifer testing plan to be potentially performed in conjunction with the static water level recovery measurements described in the Groundwater Level Quality Assurance Plan; ■ Provides a work plan for the investigation of deep-seated nitrogen and nitrate attenuation parameters in soils and groundwater; and ■ Provides a plan to revise the groundwater model. Ideally, the work plan will be revised following discussions with the TCEQ relating to identifying the appropriate regulatory program for the LLAS. This work plan will be descriptive in nature, and the remediation objectives and investigative results will provide a basis for the subsequent development of a remediation plan for the LLAS. Terracon anticipates that the Revised Remediation Work Plan will be submitted to the TCEQ along with the LLAS Annual Report in May 2009. Task 2 - HLAS Terracon shall complete two main project tasks related to compliance with the City of Lubbock's TPDES permit No. 10353-002 related to the HLAS. The two project tasks and associated work scope are summarized below. Task 2.1- HL,4S Data jVfaiweeme►tt This task will involve database file management including database updates, preparation of supporting graphs, and review of data provided by the City of Lubbock during the fiscal year. The City of Lubbock will collect onsite groundwater samples, gauge monitor wells, and procure laboratory services. The city -contracted laboratory will be NELAC accredited. Sampling data will not be reviewed and reported pursuant to TRRP-13 (Review and Reporting of COC Concentration Data). Thus, Page 13 of 18 Terracon has not included a usability review of the data or the preparation of a Data Usability Summary (DUS) in this proposal. It is anticipated that the following data will be collected, compiled, and included in the databases during the fiscal year: • Quarterly nitrate data from southern onsite monitor wells (MW-IA, MW-2A, MW-3�1, MW-35, and MW-36); • Semi-annual nitrate data from 36 onsite wells: • Annual static water level data from 36 onsite wells; • Annual groundwater quality data from 36 onsite wells; and • Annual groundwater quality field sampling data (i.e., pH, conductivity, temperature) from 36 onsite wells. Terracon will integrate laboratory and field collected data into existing databases. Terracon will review the data for trends and spatial distribution. Throughout the year, as data is compiled and reviewed, Terracon will evaluate the data and communicate any findings with the City of Lubbock staff and attorneys. Task 2.2 - HLASAnnual Renvrt This task involves preparation of the iiLAS annual report. The HLAS annual report will summarize the project history and monitoring activities, and will include tabular sampling and gauging results and maps of nitrate iso-concentrations and potentiometric contours. Terracon will prepare a drall report that will be submitted to the City of Lubbock and attorneys for review and comments. Terracon will work with the City of Lubbock and attorneys to address any comments and will prepare a final report. The report will be sealed by a licensed professional geoscientist or licensed professional engineer. The report is due to the TCEQ by the end of May each year. Task 3 - LLAS Terracon shall initially complete two main project tasks related to compliance with the City of Lubbock's TPDES Permit No. 10353-002 related to the LLAS. The two project tasks and associated work scope are summarized below. Task 3.1- LLAS Data AfanaQement This task will involve database rile management including database updates. preparation of supporting graphs, and review of data provided by the City of Lubbock during the fiscal year. The City of Lubbock will collect onsite groundwater samples, gauge monitor wells, and procure laboratory services. The city -contracted laboratory will be NELAC accredited. Sampling data will not be reviewed quid reported pursuant to TRRP-13. Thus, Terracon has not included a usability review of the data or the preparation of a DUS in this proposal. Page 14 of 18 It is anticipated that the following data will be collected, compiled, and included in the databases during the fiscal year: • Monthly groundwater production data for approximately 43 recovery wells; • Semi-annual nitrate data from approximately 150 site wells; • Annual static water level data from approximately 150 site wells; • Annual groundwater quality data from approximately 150 site wells; • Annual groundwater quality field sampling data (i.e., pH, conductivity, and temperature) from approximately 150 site wells; and • Quarterly lake nitrate data. Terracon will integrate laboratory and field collected data into existing databases. Terracon will review the data for trends and spatial distribution. Throughout the year, as data is compiled and reviewed, Terracon will evaluate the data and communicate any findings with the City of Lubbock staff and attorneys. Task 3.2 - LLAS Annual Report This task generally involves preparation of the LLAS annual report. The LLAS annual report will summarize the project history and monitoring and remediation activities, and will include tabular sampling and gauging results and maps of nitrate iso-concentrations and potentiometric contours. The May 2009 LLAS annual report will not include groundwater modeling revisions and projections. Tcrracon will prepare a draft report that will be submitted to the City of Lubbock and attorneys for review and comments. Terracon will work with the City of Lubbock and attorneys to address any comments and will prepare a final report. The report will be sealed by a licensed professional geoscientist or licensed professional engineer. The report is due to the TCEQ by the end of May each year. Task 4 - Project Management / Communications During the course of the project, there will be times when Terracon will need to communicate with the City of Lubbock staff, attorneys, the TCEQ, and with Agri -Waste Technologies (AWT) regarding routine matters or to address questions that arise from operations and management of the HI.AS and LLAS. Initial meetings with City of Lubbock staff and the TCEQ in Austin are addressed in Tasks 1.2 and 1.3. Additionally in Task 4, Terracon anticipates an additional meeting with City of Lubbock staff and one meeting with the TCEQ Lubbock Region Office staff during the first year of the contract. Project Summary Budget Terracon will perform this project on a time and materials basis using the attached 2008 Fee Schedule. This proposal includes both one-time and routine activities. This proposal includes the annual costs to perform routine tasks once. The project summary budget for Terracon to perform work defined related to the above HLAS and LLAS tasks is as follows: Page I i of 18 ESTIMATED FEES FOR PROFESSIONAL SERVICES Task 1— Project Review and Strategic Planning Task L I —Document Review $19,791 Task 1.2 — Site Visit and Strategic Planning Meeting $11,356 "Task 1.3 — Meetings with Regulators $5,940 Task 1.4 — Revised Remediation Work Plan $15,870 Task 2 — HLAS (annual budget) Task 2.1 — HLAS Data Management $8,600 Task 2.2 — HLAS Annual Report $20,200 Task 3 — LLAS (annual budget) Task 3.1 — LLAS Data Management $9,600 Task 3.2 — LLAS Annual Report $27,340 Task 4 — Project Management (annual budget) $17,440 Total Project Fee (first 12 month period of contract) $ 136,137 Page 16 of 13 ATTACHMENT A1.2013 Described below is the scope of work and associated fees for Terracon to provide consulting services to the City of Lubbock for the Hancock Land Application Site (HLAS) and Lubbock Land Application Site (LLAS). This exhibit outlines specific tasks, budgets, and not to exceed amounts for Terracon to complete the scope of work. Terracon's fee schedule that will be used for negotiating fees for Additional Services not included in this scope of work is also attached. Specific tasks to allow Terracon to assist the City to define project strategies and/or interface with the Texas Commission on Environmental Quality (TCEQ) are included in this scope of work. In addition, Terracon has included tasks to manage project data and prepare state mandated routine annual monitoring reports for the HLAS and LLAS for submission to the TCEQ in May 2013. The 2013 Annual Report for the LLAS will include an updated groundwater model for the LLAS that was originally revised for the 2010 Annual Report. In addition, specific tasks are included to evaluate additional information pertaining to water and soil quality, and groundwater elevations in the vicinity of the LLAS and HLAS. Additional tasks such as the installation of groundwater monitoring wells, and efforts to optimize the computer model for alternative groundwater remedial approaches at the LLAS may be negotiated as Additional Services and may be added to this Agreement by amendment hereof. Task 1 — Strategic Planning and Meetings This task includes the review of updated project data as necessary, site visits, strategic planning with the City of Lubbock, and interfacing with City of Lubbock Staff and TCEQ regulators. Terracon will meet with City of Lubbock personnel to discuss strategic planning for the LLAS and HLAS including regulatory compliance and closure issues. The strategic planning session(s) will address both short-term and long-term planning. The short-term planning discussions will include wastewater operations, farming operations, and remediation activities at the LLAS. The long-term planning discussions will include the wastewater development and water use planning and the beneficial use of the property. The long-range planning will also be used to develop a monitoring, remediation, and closure strategy for the LLAS. One strategic planning meeting in Lubbock is proposed during the course of the year. Terracon will assist the City of Lubbock with their discussions with the TCEQ as necessary. The LLAS is currently operated, monitored, and remediated pursuant to the permit effective January I, 2012. Terracon will assist the City of Lubbock as necessary, and as requested, to evaluate technical issues pertaining to the permit. Task 2 - HLAS Terracon shall complete two main project tasks related to compliance with the City of Lubbock's TPDES permit No. 10353-002 related to the HLAS. The three project tasks and associated work scope are summarized below. Task 2.1 HLAS Data Manacenrent This task will involve database file management including database updates, preparation of supporting graphs, and review of data provided by the City of Lubbock during the fiscal year. The City of Lubbock will collect onsite groundwater samples, gauge monitor wells, and procure laboratory services. The city - contracted laboratory will be NELAC accredited. Sampling data will not be reviewed and reported pursuant to TRRP-13 (Review and Reporting of COC Concentration Data). Thus, Terracon has not included a usability review of the data or the preparation of a Data Usability Summary (DUS). It is anticipated that the following data will be collected, compiled, and included in the databases during the fiscal year: • Annual groundwater level measurements from thirty-one offsite irrigation wells measured by the High Plains Underground Water Conservation District; • Quarterly nitrate data from southern onsite monitor wells (MW-IA, MW-2A, MW-34, MW-35, and MW-36); • Semi-annual nitrate data from 36 onsite wells; • Annual static water level data from 36 onsite wells; • Annual groundwater quality data from 36 onsite wells; and • Annual groundwater quality field sampling data (i.e., pH, conductivity, oxidation/reduction potential, dissolved oxygen, and temperature) from 36 onsite wells. Terracon will integrate laboratory and field collected data into existing databases. Terracon will review the data for trends and spatial distribution. Throughout the year, as data are compiled and reviewed, Terracon will evaluate the data and communicate findings with the City of Lubbock staff and attorneys. Task 2.2 HLAS Annual Report This task involves preparation of the HLAS annual report. The HLAS annual report will summarize the project history and monitoring activities, and will include tabular sampling and gauging results and maps of nitrate iso-concentrations and potentiometric contours. Terracon will prepare a draft report that will be submitted to the City of Lubbock and attorneys for review and comments. Terracon will work with the City of Lubbock and attorneys to address any comments and will prepare a final report. The report will be sealed by a licensed professional geoscientist or licensed professional engineer. The report is due to the TCEQ by the end of May. Task 3 - LLAS Terracon shall initially complete three main project tasks related to compliance with the City of Lubbock's TPDES Permit No. 10353-002 related to the LLAS and one supplemental task. The three project tasks and associated work scope are summarized below. Task 3.1 LLAS Data Management This task will involve database file management including database updates, preparation of supporting graphs, and review of data provided by the City of Lubbock during the fiscal year. The City of Lubbock will collect onsite groundwater samples, gauge monitor wells, and procure laboratory services. The city - contracted laboratory will be NELAC accredited. Sampling data will not be reviewed and reported pursuant to TRRP-13. Thus, Terracon has not included a usability review of the data or the preparation of a DUS. It is anticipated that the following data will be collected, compiled, and included in the databases during the fiscal year: • Monthly groundwater production data for approximately 43 recovery wells; • Semi-annual nitrate data from approximately 150 site wells; • Annual static water level data from approximately 150 site wells; • Annual groundwater quality data from approximately 150 site wells; Annual groundwater quality field sampling data (i.e., pH, conductivity, oxidation/reduction potential, dissolved oxygen, and temperature ) from approximately 150 site wells; and Quarterly North Fork data upstream of FM 400 and monthly lake nitrate data. Terracon will integrate laboratory and field collected data into existing databases. Terracon will review the data for trends and spatial distribution. Throughout the year, as data are compiled and reviewed, Terracon will evaluate the data and communicate any findings with the City of Lubbock staff and attorneys. Task 3.2 Groundwater Model Update for 2013 LLAS Annual Report As required for the May 2013 LLAS Annual Report to the TCEQ, this task will involve preparing an annual update to the existing MODFLOW/MT3D computer model prepared for the LLAS that was revised by Terracon for the 2010 LLAS Annual Report. As directed by the TCEQ, the May 2013 LLAS annual report will include a discussion of the revisions and update to the groundwater MODFLOW/MT3D model to include a re -calibration of the model for 2013 to simulate Flow conditions and water quality at the LLAS over the next five year period. Terracon will procure the services of Dr. Ken Rainwater and his associates for the groundwater modeling task to support the preparation and submission of the 2013 LLAS Annual Report, and they will focus on those modeling tasks necessary to re -calibrate the model based on comparison of modeled data to actual data from 2013 and the previous years. Once the model has been calibrated to match approximate groundwater levels and nitrate concentrations, the current nitrate concentration data will be input into the model to generate a prediction of future conditions for a 5-year predictive period in accordance with the current Remediation Plan. The modeling description and results will be presented in the 2013 LLAS Annual Report as described below. Task 3.3 LLAS Annual Report ]'his task will involve preparation of the LLAS annual report. The LLAS annual report will summarize the project history and monitoring and remediation activities, and will include tabular sampling and gauging results and maps of nitrate iso-concentrations and potentiometric contours. The May 2013 LLAS annual report will also include a discussion of the 2013 LLAS MODFLOW/MT3D model based on the updated nitrate distribution in groundwater and expected groundwater withdrawal rates, wastewater application rates, and typical rainfall. Nitrate data from the offsite bottled water sampling program will also be evaluated. Terracon will prepare a draft report that will be submitted to the City of Lubbock and attorneys for review and comments. Terracon will work with the City of Lubbock and attorneys to address any comments and will prepare a final report. The report will be sealed by a licensed professional geoscientist or licensed professional engineer. The report is due to the TCEQ by the end of May each year. Task 4 - Project Management / Communications During the course of the project, there will be times when Terracon will need to provide overall project management duties, communicate and meet with the City of Lubbock staff, attorneys, the TCEQ, and with Agri -Waste Technologies (AWT) regarding routine matters or to address questions that arise from operations and management of the HLAS and LLAS. This would also include ongoing technical consultation to support sampling activities for the onsite and offsite areas. Initial meetings with City of Lubbock staff and the TCEQ in Austin are addressed in Tasks 1.2 and 1.3. Additionally in Task 4, Terracon anticipates an additional meeting with City of Lubbock. Task 5 — Supplemental Deep Seated Nitrogen Investigation at LLAS Soil Borings and Nitrogen Analysis The scope of work presented herein includes the advancement of five supplemental soil borings at selected locations at the LLAS. Terracon will procure the services of a subcontracted licensed water well driller. The proposed scope of work is intended to supplement similar work completed in 2011 and 2012 which identified potential sources of deep seated nitrogen in unsaturated soils beneath certain areas of the LLAS. The actual locations will be selected following completion of the unsaturated modeling work completed in 2012 and discussion with the City of Lubbock staff. The proposed costs assume Terracon labor and oversight but also assume that City of Lubbock sampling technicians familiar with the site and protocols will provide sampling support and assistance particularly pertaining to the clearing of subsurface utilities prior to drilling.. Depending on drilling conditions, soils will be collected continuously using a split barrel sampling device and logged by a Terracon geoscientist. Sample aliquots will be collected at approximately two foot intervals and archived by the laboratory. Initially, samples from approximately every four foot interval will be analyzed in the laboratory for soil nitrate (EPA Method 300.0) and soil moisture content to allow the results to be reported on a dry -weight basis. if elevated nitrate concentrations are observed, additional archived samples from adjacent intervals may also be analyzed for nitrate and soil moisture content. In addition, up to a total of five soil samples will be analyzed by sieve analysis (ASTM D Method D422) for grain size distribution. At the proposed locations for the deep seated nitrogen investigation, the depth to the water table is expected to range between 70 to 100 feet below grade. For the purpose of this cost estimate, it is assumed that the borings will extend to an average depth of 90 feet below grade and that the spoils (soil cuttings) can be spread onsite on nearby roadways of pivot irrigator tracks. Terracon will meet with the City of Lubbock to approve the precise locations of the proposed borings and will help coordinate utility clearance with Texas One Call (Dig -Tess). The City of Lubbock will be responsible for identifying the location of private subsurface utilities not identified during the Dig Tess utility clearance. Task 6 — Refine LLAS Unsaturated Zone Model for Future Nitrate Loading The objective of Task 6 will be to build upon the unsaturated zone modeling work in 201 land 2012 to predict nitrate travel times and loading rates to the underlying groundwater. Existing nitrogen and water balance estimates calculated by AWT over the last decade of effluent application will be reviewed along with other data obtained from previous investigations of deep seated nitrogen performed by the City of Lubbock and Terracon to improve the understanding of the likely distribution of unsaturated nitrate beneath the LLAS and Contract 210 plots. This information, along with the future assumed effluent application or irrigation rates, will be input to the HYDRUS unsaturated zone transport model, a public domain code, to predict the likely nitrate transport and loading over time to the water table and to evaluate nitrate source management options. Terracon will procure the services of Dr. Ken Rainwater and his associates to develop the HYDRUS model simulations. This nitrate loading information predicted by the HYDRUS unsaturated model will serve as potential input to future simulations of the saturated LLAS groundwater model using MODFLOW-MT3D described in Task 7 below and which may be further evaluated by additional modeling tasks to be included in an amendment to the contract in 2013. In previous saturated zone groundwater modeling efforts, the values of the nitrate input with recharge in the LLAS MODFLOW-MT3D model were based on calibration to tit the historical groundwater nitrate distributions and informed by the distribution of applied effluent across the different LLAS irrigation plots. When these nitrate inputs were used in the 5-year groundwater model predictions, it was assumed that the near future would be like the recent past. However, when longer simulations of 30 years are made, the uncertainty of those calibrated nitrate inputs persisting over the entire 30 year period becomes much more questionable. As proposed herein, an improved understanding of longer term loading and groundwater impact could be achieved with the use of the HYDRUS unsaturated zone model. Two conditions and nitrogen source management strategies will be modeled. In the first condition, input to the HYDRUS model will be the assumed current vertical distribution of nitrate in the unsaturated zone as the starting condition, and then applying irrigation water with the assumed current nitrogen concentrations in a manner similar to previous and planned future LLAS effluent application rates. In the second condition, input to the HYDRUS model will be the assumed current vertical distributions of nitrate in the unsaturated zone as the starting condition, but it will be assumed that no further effluent application takes place at the LLAS and only rainwater would be the infiltrating liquid to transport the residual nitrogen to the underlying water table. This modeling approach should provide a much more realistic and defensible approach to predicting future nitrate loadings to the water table under the two conditions proposed above and can be used to guide the overall remedial strategy. One project meeting is included in the scope of this task in order to meet with City of Lubbock personnel to discuss the results of the study effort and the draft report. Terracon will prepare a draft report that will be submitted to the City of Lubbock and attorneys for review and comments. Task 7 — Workshop for Design Basis Approach for Optimizing LLAS Groundwater Recovery System This task to be completed in 2013 includes an initial workshop with the groundwater modeling team and City of Lubbock staff to discuss the overall approach to develop an optimized groundwater recovery system for the LLAS. It is anticipated that the initial meeting/workshop will the first of multiple tasks in a multi- year effort required to develop a revised groundwater remediation plan. As such, additional tasks beyond the initial workshop may be negotiated in 2013 as part of an amendment to the contract. However, as an initial phase for 2013, a workshop will be held with the City of Lubbock staff to allow for the necessary interaction with City staff to explain the optimization effort and approach and to get feedback so that an initial design basis optimization technical memorandum can be prepared in 2013 outlining the process and approach. To obtain information required to configure the optimization analysis with the project needs, an initial workshop with City staff will be held to present optimization methods and discuss performance objectives of the remediation system. Attributes of the system design objectives include control/minimize plume migration offsite, reduce plume mass, shrink plume footprint, limit offsite plume, limit discharge to Yellowhouse Canyon and other desirable characteristics as merited ) as well as timeframe goals for achievement. This workshop will also include discussions on any desired constraints on the optimization solution such as restrictions on potential locations for new monitoring wells, limits on total and well specific extraction rates, minimum and maximum groundwater levels, and budgetary constraints for implementation (including both construction and annual operation costs). Following the conclusion of the initial workshop, a draft technical memorandum will be prepared and submitted to the City of Lubbock summarizing the outcome and decisions of the meeting and various optimization methods that were discussed. It is envisioned that this document will set the stage for the development of future groundwater modeling optimization efforts. Task 8 — Recommendations for Revised Sampling Plan The objective of this task will be to first utilize and review existing publicly available information to fill data gaps that may exist since completion of area wide investigations completed by ARCADIS and the Texas Water Commission in the late 1980s. The second objective of this task is to make recommendations concerning possible revisions to the groundwater monitoring program. This task will initially involve an updated review of publicly available water well information from the Texas Water Development Board (TWDB), the High Plains Underground Water Conservation District, and the Texas Commission on Environmental Quality (TCEQ) to identify new or additional wells and publicly available groundwater quality data in the vicinity of the LLAS since the time of preparation of the regional study completed as part of the original remediation plan submitted in 1989. Since that time, it is anticipated that additional domestic and irrigation wells have been installed and perhaps groundwater quality information will be available in public databases. In late 2009, Terracon subcontracted with an environmental data management fine to complete a water well search of publicly available data on wells in the vicinity of LLAS and to obtain current land/well ownership. Based on the preliminary review of that information, several hundred wells and well owners were identified. The updated water well database will be compared to the previous available data including those wells sampled as part of the City of Lubbock's bottled water sampling program in order to make recommendations for possible revisions to the groundwater monitoring program. This task may include the identification of additional private irrigation wells that, if groundwater quality information could be obtained, could add to the existing groundwater quality database and further guide the installation of future groundwater monitoring wells. It is assumed that the City of Lubbock can provide the names and addresses of the wells sampled as part of the bottled water sampling program. Estimated costs to complete Tasks I through 8 are presented in Table 1. Please note that these costs are conceptual in nature and were prepared for planning purposes only. In some cases, written cost estimates were received from selected vendors and contractors and these estimates are subject to change depending on the actual timeframe for the work and the exact nature and scope of the actual work performed. In other circumstances, no written estimates were received and some costs were estimated based on Terracon's experience with this and similar projects. It is also assumed that sampling technicians from the City of Lubbock will be available to assist with the sampling activities to facilitate the overall effort. Project Summary Budget Terracon will perform this project on a time and materials basis using the attached Fee Schedule. This proposal includes both one-time and routine activities. This proposal includes the annual costs to perform routine tasks once. The project summary budget for Terracon to perform work defined related to the above HLAS and LLAS tasks is as follows: ESTIMATED )FEES FOR PROFESSIONAL SERVICES Task 1 — Strategic Planning and Meeting $8,600 Task 2 — HLAS (annual budget) Task 2.1 — HLAS Data Management $5,600 Task 2.2 --- HLAS Annual Report $15,000 Task 3 — LLAS (annual budget) Task 3.1 — LLAS Data Management $8,600 Task 3.2 — Groundwater Model Update for Annual Report $35,500 Task 3.3 -- LLAS Annual Report $25,000 Task 4 — Project Management (annual budget) $15,000 Task 5 — Supplemental Deep Seated Nitrogen Investigation at LLAS $40,500 Task 6 — Refine LLAS Unsaturated Zone Model $20,000 Task 7 — Workshop for Design Basis Optimization Study for LLAS $17,000 Task 8 — Revised Sampling Plan $5,000 TOTAL TASKS 1 THROUGH 8 $195,800 Irerrac®n ENVIRONMENTAL CONSULTING SERVICES FEE SCHEDULE HOURLY FEES FOR PERSONNEL Environmental Professional includes Environmental Engineer, Environmental Scientist, Geologist and Hydrogeologist ExpertWitness.........................................................................................................................................$175.00 SeniorPrincipal / Program Manager........................................................................................................$160.00 Principal...................................................................................................................................................$135.00 GroupManager........................................................................................................................................$125.00 Senior Environmental Engineer...............................................................................................................$125.00 SeniorProject Manager............................................................................................................................$1 10.00 ProjectManager.......................................................................................................................................$100.00 Environmental Professional V.................................................................................................................$100.00 Environmental Professional 1V..................................................................................................................$95.00 Environmental Professional III..................................................................................................................$85.00 Environmental Professional 11...................................................................................................................$75.00 Environmental Professional 1.....................................................................................................................$65.00 Environmental Technician 11.....................................................................................................................$65.00 Environmental Technician 1.......................................................................................................................$60.00 AdministrativeAssistant............................................................................................................................$55.00 Draftsperson'CAD Operator.................................................................................... WordProcessor..........................................................................................................................................$50.00 Clerical.......................................................................................................................................................$45.00 TRAVEL EXPENSES Reimbursable Expenses are charged at cost plus 10% Vehicle Charge (local), per day.................................................................................................................$60.00 Mileage(per mile)........................................................................................................................................$0.58 PerDiem..................................................................................................................................................$125.00 Document Delivery/Overnight (per standard package).............................................................................$20.00 FIELD EXPENSES DevelopmentPump (Per day)....................................................................................................................$40.00 DisposableBailer (each)............................................................................................................................$20.00 GEM 2000 Gas Analyzer & Extraction Monitor (per day)......................................................................$200.00 HandAuger (per day)................................................................................................................................$25.00 Handheld GPS Instrumentation (per day)..................................................................................................$45.00 High Flow Air Pump (Per day)..................................................................................................................$50.00 IAQ Instrumentation (QTRAK, Moisture Meter) (per day).......................................................................$50.00 InterfaceProbe (per day)............................................................................................................................$85.00 LowFlow Air Pump (per day)...................................................................................................................$35.00 Low Flow Sampling Cell (includes YS1/Horiba & Flow cell)..................................................................$150.00 Low Flow Bladder Pump (Per day)..........................................................................................................$100.00 PeristalticPump (per day)..........................................................................................................................$50.00 pH/Conductivity/Temperature Meter (per day).........................................................................................$50.00 PIDMeter (per day)............................................................................................................................I....$110.00 SampleKit (per boring).............................................................................................................................$35.00 SampleKit (per well).................................................................................................................................$50.00 Submersible Purge Pump (per day)..........................................................................................................$175.00 Trimble Pro XRS Pathfinder Backpack GPS (per day)...........................................................................$165.00 Water Level Indicator (per day).................................................................................................................$35.00 XRFMeter (per day)................................................................................................................................$350.00 SUBCONTRACTS AND THIRD PARTY CONTRACTS With the exception of those subcontracts specifically listed above to be executed through Terracon at cost plus 10%, other normal subcontract functions shall be executed through the City of Lubbock. Upon City's approval, other subcontracts may be executed through Terracon at cost plus 10%.