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SECOND QUARTER 2003 <br /> GROUNDWATER MONITORING REPORT <br /> AND ADDITIONAL ASSESSMENT REPORT <br /> JAMAR OIL DISTRIBUTION <br /> NNE 2003 <br /> GROUNDWATER MONITORING <br /> The following sections concern the Second Quarter 2003 groundwater monitoring and sampling <br /> event which took place on May 29, 2003, <br /> Groundwater Elevations <br /> Prior to gauging depths to groundwater, all of the groundwater monitoring wells and the extraction <br /> well were checked for the presence of free floating hydrocarbons(free product) using an interface <br /> probe. No free product was present in any of the wells. Measurements of depths to groundwater <br /> were then taken at each well from surveyed marks on the casing using an electric water level sensor <br /> or interface probe. <br /> Monitoring Well Purging <br /> The wells were purged using a 2-inch, Rediflo submersible pump until a minimum of three <br /> equivalent well volumes of water were removed from each well. Groundwater purged from the <br /> wells was placed into DOT approved 55-gallon drums and stored on-site, prior to disposal by GHH. <br /> During the groundwater purging operations, physical parameters such as pH, temperature and <br /> conductivity were monitored and recorded on field data sheets, which are included in Appendix B. <br /> Groundwater purging was discontinued when the physical parameters indicated above appeared to <br /> stabilize in the purged groundwater. <br /> To reduce the potential for cross contamination between wells, all purging and sampling equipment <br /> were washed in a trisodium phosphate solution and rinsed in potable water prior to each usage. <br /> Groundwater Sampling <br /> Prior to sampling, the wells were allowed to recharge to a minimum of 80% of their initial static <br /> water levels. Groundwater samples were collected from each well using a new disposable bailer. <br /> The samples were placed into the appropriate laboratory prepared containers, using proper sample <br /> handling and chain-of-custody (COC)protocol established by the USEPA. The samples were <br /> labeled with the date, time, and identifying well number-, stored in a cooler at 4° Centigrade or less, <br /> and transported to a state certified laboratory under completed COC documentation_ <br /> 7 <br />