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• FOURTH QUARTER,2001 <br /> GROUNDWATER MONITORING REPORT <br /> JAMAR OIL DISTRIBUTION <br /> MAY 2002 <br /> • Collect groundwater samples from the monitoring wells <br /> • Analyze water samples from the five monitoring wells for total petroleum <br /> hydrocarbons, as gasoline (TPH G), benzene,toluene, ethylbenzene, and xylenes <br /> (BTEX), Fuel Oxygenates (MTBE,TBA,DIPE,ETBE, TAME), EDB, and 1,2-DCA. <br /> • Prepare this QMR for submittal to the County and Regional Board <br /> GROUNDWATER MONITORING <br /> Groundwater Elevations <br /> Prior to gauging depths to groundwater,the groundwater monitoring wells were checked for the <br /> presence of free floating hydrocarbons using an interface probe No free product was present in <br /> any of the wells Depths to groundwater measurements were then taken from each well from <br /> surveyed marks on the casing using an electric water level sensor or interface probe <br /> Monitoring Well Purging <br /> The wells were purged using a 2-inch diameter submersible groundwater pump until a minimum <br /> of three equivalent well volumes of water were removed from each well Groundwater purged <br /> from the wells was placed into DOT approved 55-gallon drums and stored on-site, prior to <br /> disposal by USA During the groundwater purging operations,physical parameters such as pH, <br /> temperature and conductivity were monitored and recorded on field data sheets,which are <br /> included in Appendix A <br /> Groundwater purging was discontinued when the physical parameters indicated above appeared <br /> to stabilize in the purged groundwater To reduce the potential for cross contamination between <br /> wells, all purging and sampling equipment were washed in a trisodium phosphate solution and <br /> 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 <br /> bailer The samples were placed into the appropriate laboratory prepared containers, using <br /> proper sample handling and chain-of-custody(COC) protocol established by the USEPA The <br /> samples were labeled with the date, time, identifying well number, stored in a cooler at 4' <br /> • Centigrade or less,and transported to a state certified laboratory under completed COC <br /> documentation <br /> 3 <br />