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SOP No. 22.0 Purging and Sampling Monitoring Well <br />5.0 PROCEDURES <br />Verify locations of wells, media to be sampled, and parameters to be analyzed <br />for as specified in the sampling plan. <br />2. Confirm that the wells to be sampled have been developed (refer to SOP "Well <br />Development"). <br />3. Prepare field log book with description of site, weather, participants, and other <br />relevant observations, including all sampling data necessary to complete the <br />groundwater monitoring data log (refer to SOP "Note Taking and Log Book <br />Entries"). Inspect the well for soundness of protective casing and surface <br />ground seal. <br />4. Measure the casing inside diameter (CID) and record in inches. From the top of <br />the casing, measure the depth (in feet) to water (DTW) with an electronic water <br />level indicator and record in the field log book. Static water level <br />measurements must be recorded from the surveyor's mark at the top of the <br />casing, if present. If no mark is present, mark a location with a metal file or <br />indelible marker to the north on the casing for future reference. Measure and <br />record the total depth (in feet) (TD) of the well once a quarter. <br />5. Monitoring wells should be sampled by starting with the upgradient (or clean <br />wells) and proceeding downgradient (in the order from most to least <br />contaminated wells) for the remaining monitoring wells. <br />6. Determine the volume of water in gallons in one well casing: <br />For a 2-inch well: <br />Vol = [(TD - DTW) * 0.16] <br />For a 4-inch well: <br />Vol = [(TD - DTW) * 0.65] <br />For a 5-inch well: <br />Vol = [(TD - DTW) * 1.031 <br />For a 6-inch well: <br />Vol = [(TD - DTW) * 1.48] <br />Or calculate the volume using the following formula: <br />Vol = (TD - DTW)(CID)2(0.041) <br />7/17/07 Page 2 of 9 R Squared Inc.