PERMIT FILE - 9/3/2008, 9:15:35 AM-MR1

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SOP No. 22.0 Purging and Sampling Monitoring Well SOP No. 52.0 Note Taking and Log Book Entries SOP No. 66.0 Well Development 5.0 PROCEDURES 1. Verify locations of wells, media to be sampled, and parameters to be analyzed for as specified in the sampling plan. 2. Confirm that the wells to be sampled have been developed (refer to SOP "Well Development"). 3. Prepare field log book with description of site, weather, participants, and other relevant observations, including all sampling data necessary to complete the groundwater monitoring data log (refer to SOP "Note Taking and Log Book Entries"). Inspect the well for soundness of protective casing and surface ground seal. 4. Measure the casing inside diameter (CID) and record in inches. From the top of the casing, measure the depth (in feet) to water (DTW) with an electronic water level indicator and record in the field log book. Static water level measurements must be recorded from the surveyor's mark at the top of the casing, if present. If no mark is present, mark a location with a metal file or indelible marker to the north on the casing for future reference. Measure and record the total depth (in feet) (TD) of the well once a quarter. 5. Monitoring wells should be sampled by starting with the upgradient (or clean wells) and proceeding downgradient (in the order from most to least contaminated wells) for the remaining monitoring wells. 6. Determine the volume of water in gallons in one well casing: For a 2-inch well: Vol = [(TD - DTW) * 0.16] For a 4-inch well: Vol = [(TD - DTW) * 0.65] For a 5-inch well: Vol = [(TD - DTW) * 1.03] For a 6-inch well: Vol = [(TD - DTW) * 1.48] Or calculate the volume using the following formula: Vol = (TD - DTW)(CID)2(0.041) Where TD = total well depth (ft), DTW = depth to water (ft), CID = casing inner diameter (in). 4/23/07 Page 2 of 7 R Squared Inc. Attachment A