Attachment_1_AZMET_PWS_1.pdf

Solicitation No. 140R3023R0021 Attachment 1

Performance Work Statement Operation and Maintenance of Automated Weather Stations, Reporting of Meteorological Data, and Calculation of Standardized Reference Evapotranspiration Values for the Lower Colorado River.

1. INTRODUCTION

The University of Arizona (U of A) operates the Arizona Meteorological Network (AZMET) which provides weather-related information for much of Arizona through a network of automated weather stations. U of A has been providing Reclamation with standardized reference evapotranspiration (ETos) values since 2004.

Reclamation uses these standardized ETos values for estimating water use in cultivated and non-cultivated vegetation, and evaporation from open water surfaces along the Lower Colorado River and adjacent areas to which Colorado River water is diverted and used. Presently, eleven automated weather stations along the mainstem of the Colorado River are being operated for the purposes of providing ETos and other meteorological data to Reclamation and other interested parties including agricultural producers, irrigation districts and regulatory agencies. Reclamation uses these evapotranspiration and evaporation values in decision making concerning the management of the Lower Colorado River.

2. SCOPE

The scope of this project includes the operation and maintenance of a minimum of eight AZMET weather stations and three mobile ETos stations along the Lower Colorado River in a manner that supplies the requisite data for computation of standardized reference evapotranspiration (ETos). Daily values of ETos shall be computed from meteorological data sets generated by the weather stations referred to in Task 1 and from other data sets designated by Reclamation (e.g., California Irrigation Management Information System (CIMIS)). These ETos data sets shall be delivered to Reclamation.

3. APPLICABLE DOCUMENTS

3.1 – The ASCE Standardized Reference Evapotranspiration Equation. Allen, R. G. et al.

(2005). American Society of Civil Engineers, Reston, VA.

4. TASKS

4.1 - Task 1

The Contractor (U of A) shall operate and maintain a minimum of eight automated weather stations and three mobile ETos stations in Arizona located along the lower Colorado River and adjacent areas to which Colorado River water is diverted and used. The station names, locations, and a description of the stations are shown in Table 1. All stations listed in Table 1 will provide the data necessary for the computation of standardized reference evapotranspiration values.

Operation and maintenance of the stations shown in Table 1 will include the following minimum activities and actions on the part of U of A. The activities and actions taken by U of A must ensure that the values collected for all parameters required to calculate values of standardized reference evapotranspiration are representative of conditions at the station sites and are scientifically defensible.

The contractor shall provide the following:

4.1.1 Quarterly on-site maintenance whereby each station and the nearby surroundings are cleaned, sensors are compared against appropriate standards, and vegetation conditions upwind of the station, known as the fetch, are documented. Five additional visits are performed for cleaning and inspecting. This totals nine visits per year.

4.1.2 Preventative maintenance which involves replacing aging sensors with refurbished and newly calibrated sensors on a scheduled basis.

4.1.3 Emergency maintenance to repair and/or replace malfunctioning station components (e.g., sensors, power supplies, data loggers and tower components) on a timely basis.

4.1.4 Data processing on a daily basis to include: a) running quality control checks on incoming data,

b) processing the data into useable formats, and c) making the data available at no charge to the government via AZMET’s public access website. http://ag.arizona.edu/AZMET/

Table 1

Weather stations to be operated

* Full AZMET Stations measure air & soil temperature, relative humidity, solar radiation, wind speed & direction, and precipitation ** Mobile ETo Stations measure air temperature, relative humidity, and wind speed (solar radiation obtained from nearby full AZMET station) *** Although considered a Full AZMET Station, Mohave 2 does not have soil temperature measurements

STATION NAME LOCATION STATION TYPE

Mohave Mohave Valley

Fort Mojave Tribal Farm (Off Boundary Cone)

Full AZMET Station*

Mohave 2 Mohave Valley

Fort Mojave Tribal Farm Indian 4 & Vanderslice

Full AZMET Station*,***

Ft Mohave CA Mohave Valley

Fort Mojave Tribal Farm

1.9 miles west of Mohave station

Mobile Station**

Parker Parker Valley CRIT Farms River Ranch Full AZMET Station*

Parker 2 Parker Valley Rolanco Farms Full AZMET Station*

Roll Lower Gila Valley Growers Mohawk Gin Yard Full AZMET Station*

Roll ETos Lower Gila Valley Lyreedale Farm Mobile Station**

Yuma Valley Yuma Valley U of A Yuma Agricultural Center Full AZMET Station*

Yuma North Gila North Gila Valley Harrison Farms Full AZMET Station*

Yuma South Yuma Valley 3 miles southwest of Somerton Full AZMET Station*

Yuma ETos Yuma Valley U of A Yuma Agricultural Center Mobile Station** http://ag.arizona.edu/AZMET/

4.2 - Task 2

Compute daily standardized reference evapotranspiration values from the meteorological data sets obtained from the AZMET and CIMIS stations shown in Table 2. U of A will provide technical support, as requested by Reclamation, with the interpretation and utilization of the standardized reference evapotranspiration values produced under this contract. The computation process for standardized reference evapotranspiration will include a complete review and assessment of the relevant meteorological data collected at each station shown in Table 2. Data from AZMET and CIMIS stations will be assessed using quality control and quality assurance procedures which are standard for the AZMET network. Data deemed in error will be replaced with either adjusted or estimated data to ensure that the resulting standardized reference evapotranspiration data sets are representative of the actual conditions at the station sites and scientifically defensible.

Standardized reference evapotranspiration values will be computed using the Standardized Reference ET equation recommended by American Society of Civil Engineers (ASCE) for a short crop with a daily computational time step (see applicable documents) and adjusted for station aridity when required.

Table 2 Stations for which daily standardized reference evapotranspiration values will be calculated.

Station Name Network

Mohave 2 AZMET

Mohave AZMET

Parker 2 AZMET

Parker AZMET

Yuma Valley AZMET

Yuma South AZMET

Yuma North Gila AZMET

Roll AZMET

Blythe NE CIMIS

Ripley CIMIS

Palo Verde II CIMIS

Mohave ETos AZMET

Yuma Valley ETos AZMET

Roll ETos AZMET

5. DELIVERABLES

5.1 - Meteorological Data

U of A will prepare the meteorological data sets from all weather stations operated under this contract. The meteorological data sets will be processed according to AZMET standard procedures and made available to the public in the standard formats used on AZMET’s website: http://ag.arizona.edu/azmet.

http://ag.arizona.edu/azmet

5.2 Standardized ETo values

U of A will provide annual summaries of daily standardized reference evapotranspiration values for the weather stations listed in Table 2, above, plus any additional stations designated by Reclamation provided such stations have sufficient data to support the computation of standardized reference evapotranspiration values. The annual summaries for each station will be delivered to Reclamation by the first of March of the year subsequent to the year of data collection. The standardized reference evapotranspiration values for each station shall be delivered to the Contracting Officer’s Representative via e-mail in an Excel spreadsheet format.

6. PERFORMANCE REQUIREMENTS SUMMARY

Each task rendered under this contract is subject to Government inspection during the Contractor’s performance. Summarized below is the Performance Requirements Summary (PRS) outlining the required tasks, and the performance standards and method(s) the Government will use in monitoring each task.

Performance Requirements Summary (PRS) – AZMET

Desired Outcomes

Required Service Performance Standard Monitoring Method

1. Perform Regular Maintenance

IAW 4.1.1

Regular maintenance and calibration of all sensors is conducted and documented in a maintenance report that is submitted quarterly.

Maintain weather station sensors and AZMET website and provide report quarterly.

100% Inspection of Quarterly Report

2. Conduct Emergency Maintenance

IAW 4.1.3

Emergency maintenance on malfunctioning sensors is provided and documented in a maintenance report that is submitted quarterly.

All emergency maintenance will be performed within one week of detection.

100% Inspection of Quarterly Report

3. Ensure continuous data collection

IAW 4.1.4

Daily data collection All collected dated is posted to the AZMET website daily.

Random comparison of collected data with historical data

7. TRAVEL

Traveling from monitoring station to monitoring station is a part of this contract and included in the contract price.

All travel proposed shall be in accordance with the Federal Travel Regulations (FTR).

8. PERIOD OF PERFORMANCE

The contract term is October 1, 2023, through September 30, 2024, with four 1-year options to extend the contract if exercised. The solicitation/contract also included FAR 52.217-8, Option to Extend Services, which permits extension of the period of performance for up to six months.