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EZ-SERVE QUARTERLY GROUNDWATER MONITORING PROGRAM SAMPLING AND ANALYSIS PLAN The following sections describe the procedures and protocols to be followed during the quarterly groundwater monitoring events at all EZ-Serve sites. Depth-to-Water Measurements Prior to sampling the groundwater monitoring wells, the wells will be opened to the atmosphere for approximately one-quarter of one hour, to allow the static water level to adjust to the open barometric pressure. The depth-to-groundwater will then be measured, using an oil-water interface probe, and a check for free-product on top of the water column will be made The interface probe will be lowered slowly until free product or water is encountered At flus point, the mark on the interface probe wire will be read to the nearest 0 01 feet at the permanent reference point on the top of the well casing If free product is encountered the probe will be lowered until water is encountered. The difference between the two depths will correspond to the thickness of the free product. The total depth of the well will then be measured using the same probe A bailer will then be lowered into the water to approximately one-half the bailer length The bailer will be checkers for the presence of a product sheen. In the event that a dedicated bailer or purge tubing exists in the well the dedicated equipment will be removed prior to checlang the depth-to-water, and temporarily stored in a clean, plastic garbage bag. The depth-to-water and bottom of well measurements, and the presence or absence of free product, will be recorded on the field sampling form In addition, comments regarding the condition of the well and/or containment box will also be noted on the field sampling sheet at this time Wells observed to contain a product sheen or free product on top of the water column will not be purged or sampled Groundwater Monitoring Well Purging The depth-to-water and bottom of well measurements will be used to calculate the volume of water contained in one well volume. The following values will be used to calculate the,volume of water contained in the,weil casing and filter pack surrounding,the well. I Well Diameter Gallons/linear foot 2-inch 0.16 4-inch 0.65 8-inch filter pack 0.78 10-inch filter pack 1.21 I The minimum purge ,volume will be three times the calculated well volume. Once the ' minimum purge volume has been calculated' purging jwill,begin 1 Purging will be conducted F 1 �