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A-4 GROUNDWATER MONITORING A-4.1 Water Level Measurements Water level measurements are made in the wells prior to purging and sampling the wells. Measurement protocol is as follows: I. The water level probe is decontaminated in a trisodium phosphate or non- phosphate detergent wash, followed by a distilled water rinse, prior to use in each well. 2. Water level measurements are made using a conductivity-based water-level meter. Depth-to-water is generally measured from a surveyed mark on the north rim of the PVC well casing. The water level measurements are converted to elevations using the surveyed casing elevations. A-4.2 Groundwater Sampling Groundwater samples are collected from the monitoring wells at the site. The sampling protocol for each well is as follows: 1. Down-well equipment (pumps, bailers, etc.) is decontaminated by steam cleaning, or by scrubbing in a trisodium-phosphate or non-phosphate detergent wash followed by a distilled water rinse, prior to use in each well. Bailer cord is replaced prior to use in each well. 2. The depth to groundwater is measured using a conductivity-based water-level meter. 3. The volume of water in gallons standing in the well is calculated by subtracting the depth to groundwater measurement from the depth of the well and multiplying by the appropriate conversion factor (0.16 for 2-inch wells, and 0.65 for 4-inch wells). 4. Three to five well volumes of water are purged from each well using a submersible pump, bladder pump, or Teflon bailer. 5. Physical parameters (pH, electrical conductivity, and temperature) are monitored for stability while purging. The physical parameter measurements are recorded on purge-and-sample logs, along with the time and volume of water purged at each measurement. 6. Samples are collected with a disposable bailer or bladder pump into appropriately prepared bottles provided by the analytical laboratory. 71812.H 01/ST06 R658/J DZ Av ©2006 Kleinfelder, Inc. Page A-6 June 22, 2006