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Spring Field Season Prep - Equipment Checks, Calibration, and Supply Planning

Equipment that sat unused all winter fails in the field. VOA vials run out. A re-mobilization costs more than preventing the problem. A systematic pre-season check prevents delays, failed samples, and the cost of returning to sites.

Equipment Calibration and Function Testing

Start with instruments that require the longest lead times for repair or replacement. Photoionization detectors (PIDs), flame ionization detectors (FIDs), and multi-gas meters need calibration with certified reference gases. Most manufacturers recommend annual calibration, but check your instrument’s manual for specific intervals.

Water level meters and interface probes require calibration against known depths. Use a steel tape to verify electronic measurements at multiple depths. Replace worn probe tips and check cable markings for accuracy. Conductivity meters need calibration with standard solutions at multiple ranges, typically 84 µS/cm, 1,413 µS/cm, and 12,880 µS/cm.

Test all pumps under field conditions. Bladder pumps require pressure testing to verify they hold vacuum. Peristaltic pumps need new tubing if the existing tubing shows cracking or permanent deformation. Submersible pumps should run for 30 minutes to check for overheating or flow rate decline.

Sample Container and Preservation Inventory

Count existing sample containers and check expiration dates on preservatives. VOA vials with hydrochloric acid preservative typically expire 2-3 years from manufacture. Sodium bisulfate preservative in chlorine residual bottles expires in 1 year. Order replacements 4-6 weeks before your first sampling event.

Calculate container needs based on your expected sampling schedule. A typical monitoring well sampling event requires 6-8 containers per well for a full analytical suite: VOCs, SVOCs, metals, and general chemistry. Add 20% extra containers for QA/QC samples and potential resampling.

Verify that your laboratory can accept your planned sample volumes. Some labs require 250 mL for PFAS analysis while others accept 125 mL. Confirm holding times and shipping requirements, especially for parameters with short holding times like chlorine residual (15 minutes) and dissolved oxygen (immediate analysis).

Field Supply Checklist

Create a master inventory of consumable supplies. Essential items include:

  • Nitrile gloves: 2-3 boxes per sampling team
  • Sample labels: waterproof, pre-printed with project information
  • Chain of custody forms: pre-filled with standard parameters
  • Ice: 20-30 pounds per cooler for overnight shipping
  • Decontamination supplies: Alconox detergent, distilled water, methanol
  • Personal protective equipment: safety glasses, hard hats, steel-toed boots
  • Documentation materials: waterproof field books, permanent markers

Check vehicle-mounted equipment like generators, compressors, and drilling rigs. Change engine oil, air filters, and spark plugs according to manufacturer schedules. Test all electrical connections and replace corroded battery terminals.

Common Oversights That Cause Problems

Failing to check battery levels in electronic equipment leads to mid-sampling shutdowns. Charge all rechargeable batteries and test backup power supplies. Replace batteries in water level meters, PIDs, and GPS units even if they show partial charge.

Not verifying laboratory schedules causes shipping delays. Confirm that your laboratory accepts samples on your planned shipping days. Some labs have limited weekend receiving hours or holiday closures that affect holding time compliance.

Overlooking permit renewals creates legal problems. Check expiration dates on well installation permits, waste disposal manifests, and sampling access agreements. Ohio EPA requires annual registration renewals for some monitoring programs.

Ohio note: Ohio’s Voluntary Action Program (VAP) requires specific QA/QC procedures that may differ from federal requirements. Verify current VAP guidance before beginning sampling activities.

Bottom Line

A systematic pre-season equipment check prevents field delays and failed samples. Start calibration and supply ordering 6-8 weeks before your first sampling event. The cost of preparation is always less than the cost of re-mobilization. For specific sampling protocols, see our Low-Flow Groundwater Sampling and PFAS Sampling Best Practices guides.