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SECOND QUARTER,2002 GROUNDWATER MONITORING REPORT JAIVIAR OIL DISTRIBUTION AUGUST 2002 • Analyze water samples from the five monitoring wells for total petroleum hydrocarbons as gasoline and TPH G,benzene,toluene, ethylbenzene, and xylenes (BTEX), 8260 Oxygenates (MTBE,TBA,DIPE,ETBE,TAME),EDB, and 1,2 DCA • Prepare this QMR for submittal to the County and Regional Board GROUNDWATER MONITORING Groundwater Elevations Prior to gauging depths to groundwater,the groundwater monitoring wells were checked for the presence of free floating hydrocarbons using an interface probe No free product was present in any of the wells Depths to groundwater measurements were then taken from each well from surveyed marks on the casing using an electric water level sensor or interface probe • Monitoring Well Purging The wells were purged using a 2-mch diameter submersible groundwater 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 USA. During the groundwater purging operations,physical parameters such as pH, temperature and conductivity were monitored and recorded on field data sheets,wbnch are included in Appendix A 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 trnsodnum 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, identifying well number,stored in a cooler at 4' Centigrade or less, and transported to a state certified laboratory under completed COC documentation • 3