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I 1 20 December 2001 lie AGE-NC Project No 95-0128 Page 4 of 9 ' 25 COLLECTION OF WATER TREATMENT SYSTEM SAMPLES AND ANALYSIS On 12 October and 13 November 2001 AGE collected grab ground water samples from the water I treatment system On 12 October Influent and effluent treatment system samples were collected and on 13 November Influent samples,mid-treatment samples and effluent samples were collected The effluent samples were collected from the discharge line from the 300-gallon sediment tank Grab ' groundwater samples were collected from a dedicated in-line sampling port Samples were collected from the effluent of the discharge of the treatment from a dedicated in-line sampling port The mid- treatment sample was collected from a dedicated brass sampling port at the inlet to the second GAC vessel Influent and mid-treatment samples were collected in laboratory-supplied 40-m1 EPA-approved ' volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid as apreservative,into 1-liter amber bottles without preservative Effluent samples were collected in the same containers and into 500-milliliter plastic bottles without preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Water sample containers were labeled with the sample designation, date, time, and sampler's initials ' The samples collected 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 for analysis ' Water samples collected on 12 October 2001 were analyzed by Precision Enviro Tech (PET) of Stockton and water samples collected on 13 November 2001 were analyzed by McCampbell Analytical Inc (MAI)of Pacheco Effluent samples were analyzed for all of the listed analytes While ' influent, mid-treatment samples were analyzed for the first three listed analytes • Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA Method 8015 ' Modified, • Total petroleum hydrocarbons quantified as diesel (TPH-d)by EPA Method 8015 Modified on 13 November 2001 only, • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with methyl-tertiary butyl ether (MTBE) by EPA Methods 8020 or 8260, ■ 0 Volatile and Semi-volatile compounds (V OC and 5 V OC) by EPA Methods 6241625, ' a Five metals Cd, Cr, Cu, Pb,Ni and Zn in accordance with EPA Method 200 Modified and • pH In accordance with EPA Method 150 1 ' Advanced Geo Environmental Inc 1