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• THIRD QUARTER,2001 <br /> GROUNDWATER MONITORING REPORT <br /> ' JAMAR OIL DISTRIBUTION <br /> SEPTEMBER 2001 <br /> ' SCOPE OF WORK <br /> Groundwater momtoring and sampling activities were conducted at the site on July 6, 2001 The <br /> following is a brief summary of the scope of work authorized by JAMAR <br /> C Measure depths to groundwater In monitoring wells MW-1 through MW-5 <br /> • <br /> Purge a minimum of three equivalent well volumes of groundwater from each of <br /> ' the wells and monitor for pH, temperature and conductivity <br /> Collect groundwater samples from the monitoring wells <br /> ' O Analyze water samples from the five monitoring wells for total petroleum <br /> hydrocarbons as gasoline and diesel(TPH G and TPH D), benzene,toluene, <br /> ethylbenzene, and xylenes (BTEX), 8260 Oxygenates (MTBE, TBA, DIPE, <br /> ' 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 min mum <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 morutored 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 /> 1 4 I <br /> i <br />