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1 ADDITIONAL ASSESSNYANORKPLAN JAMAR SERVICE, STOCKTON DECEMBER 2001 • Drill cuttings will be placed into DOT approved 55-gallon drums and stored on-site until the soil is profiled for disposal Disposal of the cuttings will be completed by GHH Well Development I The groundwater momtonng wells will be developed using a surge block and/or submersible pump to remove fines and develop the sand pack and nearby aquifer materials Turbidity will be monitored to check the effectiveness of development Development and purge water will be put into DOT approved 55-gallon drums and labeled accordingly The drums will be left on-site pending laboratory analyses and selection of an appropriate disposal, which will be completed by GHH Groundwater Purging The newly developed wells will be allowed to equilibrate for a minimum of 48-hours prior to purging for sampling Prior to purging, depths to groundwater in all wells will be measured to the nearest 0 01-foot A minimum of three casing volumes of groundwater will then be pumped from each well prior to groundwater sampling Specific conductance,pH,temperature,and turbidity will be measured during the purging process When these parameters have relatively stabilized, the wells will be allowed to recharge and then • sampled Groundwater Sampling Groundwater samples will be collected from all on-site wells after the wells have sufficiently recovered to the static groundwater levels, or in the event that the well is pumped dry during purging,when the water level recovers to at least 80%of the onginal water level In the event that the wells are not sampled within 24-hours of purging,each well will be re-purged until at least three well volumes have been removed prior to sampling Groundwater samples will be collected using a new disposable bailer, and transported to a state certified laboratory under proper COC documentation The groundwater sample will be decanted from the bailer into laboratory provided containers appropriate for the analytical method requested The samples will then be placed into a chilled cooler in prepar4tion for transport to the laboratory Stnct COC protocol will be followed during sample collection and handling Groundwater Analyses The groundwater will be analyzed by a California certified laboratory in accordance with state guidelines and EPA protocol The groundwater samples will be analyzed for TPH G, TPH D, BT-EX, 1,2-DCA,EDB, and fuel oxygenates using EPA Methods 8015M and 8260B,respectively 6 i