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LEL chart and monitor the pump and treatment system, until December 15, 2005 when <br /> the discharge to sewer was terminated after removing the Baker Tank from the system <br /> TREATMENT SYSTEM OPERATION <br /> March 31, 2005 Start groundwater pumping and treatment Obtain samples, <br /> effluent of pump (influent of carbon unit#1) and effluent of <br /> carbon #4 Shut system off and await laboratory results to <br /> start system for discharge to sewer No discharge to sewer <br /> occurred <br /> April 8, 2005 Received laboratory report for samples showing effluent <br /> meets sewer discharge requirements Start pumping and <br /> discharge to sanitary sewer at 13 36 hours Using <br /> temporary electrical power from flower store <br /> April 11, 2005 System off on arrival Cooper and Sons temporarily turned <br /> off power to install service box for electrical from PG&E <br /> 28,633 gallons pumped and treated <br /> April 19, 2005 System off, LEL alarm Reset and check system, LEL <br /> within discharge requirements Obtain sample of discharge <br /> to sewer and analyze for TPHg, BTEX and MtBE All <br /> analytes are below laboratory lower detection limits <br /> April 21, 2005 LEL sensor shows high readings (4-7%) Cooper and Sons, <br /> • inspect and recalibrate LEL sensor <br /> April 26, 2005 Cooper and Sons replace faulty LEL sensor <br /> April 27, 2005 City of Stockton digging at intersection of Country Club <br /> Blvd and Mission Road for sewer pipeline <br /> April 29, 2005 Obtain sewer discharge samples <br /> May 10, 2005 Receive laboratory report for samples obtained April 29, <br /> 2005 TBA at 7 1 ug/L Turn off discharge and pumping <br /> Have laboratory confirm the presence of TBA No further <br /> discharge to sanitary sewer, 230314 gallons have been <br /> pumped and treated <br /> May 14, 2005 Remove #1 carbon unit from system, place #2 carbon unit <br /> into #1 position, #3 carbon unit into #2 position, #4 carbon <br /> unit into #3 position, clean carbon unit from previous <br /> dewater project into #4 position and newly delivered <br /> carbon unit into #5 position Start system and obtain <br /> effluent sample with out further discharge to sewer Tum <br /> system off Sample analyzed for TPHg, BTEX and 5 <br /> oxygenants All analytes are below laboratory Iower <br /> detection limits <br /> May 23, 2005 Request for modification of treatment system to remove <br /> TBA from effluent <br /> August 25, 2005 Completed water treatment system modification, tested <br /> system High pressure on carbons <br /> • <br /> 5 Sanchez QM 4t' 2005 <br />