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THIRD QUARTER, 2003 . GROUNDWATER MONITORING REPORT JAMAR OIL DISTRIBUTION NOVEMBER 2003 GROUNDWATER MONITORING i Groundwater Elevations Prior to gauging depths to groundwater, all of the groundwater monitoring wells and the extraction well were checked for the presence of free floating hydrocarbons (free product) using an interface probe. No free product was present in any of the wells. Measurements of depths to groundwater were then taken at each well from surveyed marks on the casing using an electric water level sensor or interface probe. Depth measurements were taken prior to the purge start ) times recorded on the field data sheets included in Appendix B. 1 Monitoring Well Purging The wells were purged using a 2-inch, Rediflo submersible pump until a minimum of three equivalent well volumes of water were removed from each well. Groundwater purged from the wells was placed into DOT approved 55-gallon drums and stored on-site, prior to disposal by GHH. During the groundwater purging operations, physical parameters such as pH, temperature and conductivity were monitored and recorded on field data sheets, which are included in Appendix B. Groundwater purging was discontinued when the physical parameters indicated above appeared to stabilize in the purged groundwater. To reduce the potential for cross contamination between wells, all purging and sampling equipment were washed in a trisodium phosphate solution and rinsed in potable water prior to each usage. Groundwater Sampling Prior to sampling, the wells were allowed to recharge to a minimum of 80% of their initial static water levels. Groundwater samples were collected from each well using a new disposable bailer. The samples were placed into the appropriate laboratory prepared containers, using proper sample handling and chain-of-custody(COC) protocol established by the USEPA. The samples were labeled with the date, time, and identifying well number; stored in a cooler at 4' Centigrade or less, � and transported to a state certified laboratory under completed COC documentation. _ • 4