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I 10 11 January 2006 AGE-NC Project No 95-0130 ' Page 9 of 14 ' were collected utilizing 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and 1-liter amber bottles Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground water sample containers were labeled ' with a sample designation, date, time, and sampler's initials ' 4 3 LABORATORY ANALYSIS OF GROUND WATER EXTRACTION AND TREATMENT Influent,intermediate(AFT-AS)and effluent grab water samples were logged on a chain of custody ' form, placed in a chilled container and transported to a California Department of Health Services (DHS)-certified laboratory to be analyzed for ' • Total petroleum hydrocarbons as diesel and motor oil(TPH-d and TPH-mo),TPH-g,by EPA Methods 35501503018015 Modified and ' • BTEX, TBA, DIPE, ETBE, TAME and MTBE by EPA Method 8260B In addition,as required at startup and annually in the City of Stockton waste water discharge permit, lie the August 2005 effluent sample was analyzed for five Leaking Underground Fuel Tank (LUFT) metals and copper by EPA Method 6010B, and total toxic organic compounds by EPA Method ' 8260B ' 44 INFLUENT MONITORING RESULTS In accordance with the requirements of City of Stockton Department of Utilities Ground Water ' Discharge Permit,monthly ground water P&T system influent sampling was performed on 15 July, 01 August and 07 September 2005 for laboratory analysis of contaminants listed in Section 4 3 ' During the above monthly monitoring events,influent water samples detected TPH-g during all three monthly monitoring events at concentrations as high as 30,000 µg11 TPH-d and TPH-mo were not detected in any of the above referenced samples BTEX constituents were detected during all three monthly monitoring events at concentrations as high as 16,000 µg/1 benzene, 14,000 µg11 toluene, 1,200 µg/1 ethylbenzene and 10,300 µg11 xylenes ' MTBE was detected (EPA Method 8260) during all three monthly monitoring events at concentrations as high as 3,100 µg/l ' The laboratory analysis did not detect any other constituents of concern Analytical results of ' Advanced GeoEnvtronm cntx1,Inc