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. FOURTH QUARTER, 2002 GROUNDWATER MONITORING REPORT AND ADDITIONAL ASSESSMENT REPORT JAMAR OIL DISTRIBUTION MARCH 2003 • Drill three geoprobe borings and collect soil and groundwater samples from each boring for laboratory analysis • Analyze selected soil and groundwater samples for gasoline and diesel range total petroleum hydrocarbons (TPH G and TPH D)using EPA Method 8015 Modified and for benzene, toluene, ethylbenzene, and xylenes (BTEX), 1,2-dichloroethane, ethyl dibromide (EDB), and oxygenated fuel additives, including methyl-tertiary-butyl-ether (MTBE), di-isopropyl ether(DiPE), ethyl tertiary butyl ether(ETBE), tertiary amyl methyl ether(TAME), and tertiary butyl alcohol (TBA), using EPA Method 8260B • Document findings in tlus Additional Assessment Report for submittal to the County and Regional Board QUARTERLY GROUNDWATER MONTTORING 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 new disposable bailer until a irnnnmum 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 GHH During the groundwater purging operations, physical parameters such as pH, temperature and conductivity were monitored and recorded on field data sheets, which 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 trisodium 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 4