Preventative Maintenance • The vendor shall provide a week of service to configure and test the AutoGC to ensure that the instrument is ready for deployment of the PAMS monitoring season (May, 2025 until the end of September, 2025). • The system will be calibrated and operational and the instrument is running automatically. • The preventative maintenance may include the replacement of consumable parts including the following: o Agilent Parts: gas chromatography columns [HP-PLOT/AL2O3 (50m x 0.32mm x 8 um),), DB-1 ( 50m x 0.32mm x 1.05 um), and restrictors (0.10 mm ID x 0.36 mm OD) for the Agilent unit. o Markes Parts: o-rings (cold trap, tube receiver), filter disks (Sintered PTFE 5.1 mm, Sintered PTFE 3.2 mm), cold traps (Unity-xr), cold trap (empty, Kori-xr), and empty beveled glass barrel. o H2 Generator (Peak Scientific): Water bottle, 12 month service kit o Merlin Microscience Dilution System: Nafion humidifier o Parker TOC1250 TOC Gas Generator: Coalescing filter BX, Coalescing filter DX, Membrane filter, Replacement catalyst. o Parker 75-83 Zero Air Purifier: Replacement catalyst, Coalescing Filter BX, SS filter o Minor repairs such as leaks and adjustments will be performed if needed. o Support during Preventative Maintenance (PM): A technician will be available and on site for a week of service, configuration and testing for the week of scheduled PM. • Replacement parts for break/fix repairs will be paid at cost after a fair and reasonable determination made by the County. Documentation of actual parts cost must be submitted with invoice. Only materials used to make a repair/replacement are to be submitted for payment. In the event of a dispute, the County shall survey prices for the same make/model or part to determine the fair market price for that item/part, and reimbursement will be made based on the survey results. Data Validation Services • The Data validation services are to include the items listed below at a minimum and Volatile Organic Compounds (VOCs) data will be validated to ensure the requirements are met for data validation as listed in the EPA Photochemical Assessment Monitoring Stations (PAMS) Technical Assistance Document. The PAMS VOCs are listed in Table 1 (below). • Data to review for validation includes: instrument calibrations, chromatogram integrations, reviewing the daily quality control checks (results from calibration standards, laboratory control standards, retention time standards), coelutions, percent recoveries, percent differences, standard deviations, signal-to-noise, method detection limits, response factors, system blanks, precision checks. • Validation will include review of standard recoveries • Identification of lost data on monthly summary pages and reprocessing of data. • Review of ambient data graphically and confirming Retention Times for proper identification of compound integration for misidentified compounds/peaks. Identify diurnal patterns. • Identification of invalidated data due to issues such as maintenance or instrument malfunctions.
