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On September 16, 1992 prior to conducting the third quarter sampling, monitor wells MW-5 and <br /> MW-6 were cleaned and redeveloped in order to prepare them for future groundwater sampling <br /> ' These wells had been covered with asphalt during repaving of the Stockton Center yard and <br /> some of the asphalt had seeped into the well heads and well casings. A stiff bristle brush was <br /> used to scrub the well casings and approximately 15 well volumes of water were removed from <br /> each well <br /> On October 14, 1992, the drums of purge water and soil residuals onsite from past sampling <br /> ' activities were disposed The water was released to a sanitary sewer drain with permission from <br /> the City of Stockton Municipal Utilities Department (MUD). The chemical concentrations in <br /> the purge water were; well within the MUD criteria for discharge to the sanitary sewer and no <br /> ' permit was required The San Joaquin County Air Quality Control Board (SJCAQCB) was <br /> contacted regarding emissions criteria and permit requirements to discharge the soil residuals <br /> onsite The constituent concentrations in the soil were well within the SJCAQCB criteria and <br /> ' the soil was disbursed on the ground surface in an area designated by EBMUD <br /> 1 <br /> I <br /> I �I <br /> i 1 <br /> 1 <br /> i <br /> 51 c\XPPS1EBMUD3RD WP A 3 >>M&90 <br /> 1 <br />