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1 ' 27 September 2004 • AGE-NC Project No 99-0559 Page 2 of 5 ' 2 2 MONTHLY MONITORING PROCEDURES In order to quantify the mass of contamination from each extraction well and to comply with the ' requirements of the City of Stockton discharge permit,monthly monitoring and sampling of influent and effluent ground water samples was performed on 29 January 2004 (influent/effluent), 26 February 2004 (influent/effluent), 23 March 2004 (influent/effluent), 14 Apnl 2004 (all ' influent wells/effluent), 19 May 2004 (all influent wells/effluent) and 24 June 2004 (all influent wells/effluent) ' Influent samples were collected in laboratory-supplied 40-m1 EPA-approved volatile organic analysis (VOA)vials containing 0 5 m1 18%hydrochloric acid as a preservative,care was taken to ensure that visible air bubbles were not present in the vials after filling and capping The effluent sample was ' collected in VOA vials and a 1-liter amber bottle without preservative All samples were labeled with the sample designation, date, time, and sampler's initials The samples were subsequently logged on a chain-of-custody farm, placed in a chilled container and transported to Cal Tech ' Environmental Laboratories, Inc (CTEL) for analysis ' The influent samples were analyzed for • TotaI petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 Modified, and • Volatile aromatic compounds(VOCs),including benzene,toluene,ethylbenzene and xylene (BTEX) with methyl-tertiary butyl ether(MTBE) by EPA Methods 8260, The effluent samples were analyzed for I0 TPH-g by EPA Method 8015 Modified/TPH-d (diesel) by EPA method 8015 Modified, • BTEX with MTBE by EPA Methods 8260, • pH in accordance with EPA Method 150 1 , and • Volatile and Semi-volatile compounds (VOC and SVOC) by EPA Methods 624/625 in February and May 2004 and Metals Cd, Cr, Cu, Pb, Ni and Zn in accordance with EPA Method 200 Modified in May 2004 I • Advanced CeoEnvironmental,Inc