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J, I r <br /> � <br /> & 18E April 2003 ! E hr E� f, <br /> AGE,NC Project No 1 97-0333 , IE i! ? , ' I ' hI� <br /> Page 2 of 11' <br /> I '2 0 GROUND WATER PUMP AND TREAT REMEDIATION,SYSTEM <br /> !z! Between 26 September and 12 December 2002(fourth quarter 2002) aground water pump-and-treat ' <br /> ,in remediation system was in continuous operation at the site,Due to a detection of MTBE in <br /> ' r'the�effluent grab water sample ata concentration of 91'µg/1, the pump-and-treat system~effluent was <br /> ILII"`E re-sampled on 02 January 2003, the laboratory reported non-detectable levels of MTBE`(less than ' " <br /> I 0 5 µg/1) The interim ground water pump-and-treat system operation and maintenance procedures I I ! <br /> for the site were outlined in AGE's Interim Remediation WorkPlan-June 2001,dated 21'June 2001, <br /> j �F <br /> 21 I GROUND WATER PUMP AND TREAT,OPERATION' <br /> , III ' , . l During the fourth,I quarter 2002,extraction well'EW-1 was adjusted at the,well-head to continuously <br /> extract ground water ate a flow rate of approximately 4 GPM, extracted ground water was routed <br /> ' ,through a ground water treatment system consisting of granular activated 'carbon (GAC) and , a <br /> ' Sunsolve® Following treatment,water was discharged undergr`ound via 2-inch diameter PVC piping <br /> to.the,City of Manteca sewer system, discharge piping is connected to a sewer manhole located <br /> approximately 25 feet south of the pump-and-treat system E <br /> Based on effluent flow meter readings'(Ta61e 5), approximately 278,640 gallons of treated water r °M <br /> were extiacted and discharged to,the City of Manteca sewer system between 26 September and 12 <br /> ' December 2002 under City ofManteca Public Works Department(CMPWD)Industrial'Wastewater <br /> Discharge'PermitNo 02-1 <br /> 22 1 GROUND WATER PUMP ,AND TREAT,SAMPLING PROCEDURES <br /> I Giound water pump-and-treat influent, middle and"effluent water samples were collected from <br /> r r valved parts located upstream (influent)„after the second treatment'media vessel anddownstream <br /> A (effluent) of the treatni ent, unit The grab'water, samples were collected utilizing 40-m1 EPA- E <br /> approved VOA vials'containmg 0 5 ml 118%hydrochloric acid as a sample preservative and 1-liter <br /> amber bottles Care was taken to ens ure,,that i visible air bubbles were riot present in the vials after <br /> filling and capping Ground water sample containers were labeled with�a sample designation, date, <br /> time, and samplers initials <br /> '' <br /> ' <br /> 23 LABORATORY ANALYSIS OF GROUND WATER PUMP;AND-TREAT SAMPLES <br /> I <br /> Ifnfluent, in, and effluent grab water samples were logged Ion a chain-of-custody form; <br /> tI <br /> Advanced Invironmental,ine <br /> tl <br /> I i, ' ' `I' ''' E `� ' ' ' I' I' r 'i E I �4 G ”'` '!'' <br /> I, I �, E I r l } }'' I�II�,IEII ' ' I IJ �'�'Ir I I <br />