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F ' f <br /> 1 <br /> ri <br /> A <br /> i <br /> ,• 31 January 2003 <br /> AGE-NC Project No 96-0232 <br />' <br /> Page 3of17 y <br /> II <br />' 16,627,886 gallons of MTBE-impacted water has been treated and discharged to the conveyance <br /> ` ditch under RWQCB waste water discharge permit no CAG915001 [National Pollutant Discharge <br /> Elimination System (NPDES)] <br /> r , <br /> ' 11 <br /> 2 2 ' GROUND WATER PUMP AND TREAT SAMPLING PROCEDURES <br /> In'accordance with RWQCB Monitoring and Reporting Program No 5-00-119,monthly sampling <br /> of influent and effluent waters from the pump-and-treat system and receiving water was required for <br />' analysis for petroleum constituents of concern In addition, a water sample from the effluent stream <br /> of the pump-and-treat system was required quarterly for bioassay <br /> IOn 21 November and 05 December 2002, samples of ground water were collected from valved <br /> sampling ports located pre-treatment(influent) and post-treatment(effluent) of the pump-and-treat <br /> I system In addition,water samples were collected from the receiving water sampling stations located <br /> in the conveyance ditch approximately 50 feet upstream(R-1) and 80 feet downstream(R-2) of the <br /> point of discharge, R-1 and R-2 locations were approved by the RWQCB during a site inspection <br /> on 22 November 2000 Monthly influent and effluent samples were not collected during the month <br /> of October 2002 due to the temporary suspension of ground water pump-and-treat activities at the <br /> site between 25 September and 29 October 2002 <br /> On 03 December 2002, an additional water sample was collected from the effluent stream of the <br /> pump-and-treat system for bioassay <br /> The grab water samples were collected from influent,effluent and receiving water locations utilizing <br /> 1-liter amber bottles and 1-gallon plastic dugs without a sample preservative and 40-m1 EPA- <br /> approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was ; <br /> taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground <br /> water sample containers were labeled with a sample designation, date, time, and sampler's initials <br /> $ 1 r r 1 = <br /> s ! <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER PUMP AND TREAT SAMPLES <br /> The monthly influent and effluent grab water samples were togged on la chain-of-custody form, <br /> placed in a chilled container and transported to a California Department of Health Services(DHS)- <br /> certified laboratory for analysis for _ <br /> 1 r <br /> • Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d <br /> and TPH-mo, respectively) by EPA Methods 35501503018015 Modified, <br /> . • Benzene,toluene,ethyl benzene and xylene(BTEX)with methyl-tertiary butyl ether(MTBE) <br /> Advanced Geo Environmental,Inc <br /> 1 <br />