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I <br /> • FIRST QUARTER,2002 <br /> GROUNDWATER MONITORING REPORT <br /> JAMAR OIL DISTRIBUTION <br /> JUNE 2002 <br /> • Analyze water samples from the five monitoring wells for total petroleum <br /> hydrocarbons as gasoline and TPH G, benzene,toluene, ethylbenzene,and xylenes <br /> (BTEX); 8260 Oxygenates(MTBE,TBA, DIPE, ETBE, TAME), EDB, and 1,2 <br /> 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,priorto <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 bailer <br /> The samples were placed into the appropriate laboratory prepared containers,using proper <br /> sample handling and chain-of-custody(COC)protocol established by the USEPA The samples <br /> were labeled with the date,time, identifying well number, stored in a cooler at 4° Centigrade or <br /> less,and transported to a state certified laboratory under completed COC documentation <br /> 3 <br />