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' 26 April 2002 AGE-NC Protect No 95-0128 ' Page 3 of 7 3 1 GROUND-WATER-EXTRACTION SYSTEM WATER SAMPLE COLLECTION On 13 November 2001, 10 December 2001, 14 January 2002, 11 February 2002 and 20 March 2002 AGE collected grab ground water samples from the water treatment system Grab ground water samples were collected from a dedicated in-line sampling port An effluent stream samples was collected from the treatment system during each sampling event An effluent stream samples was ' collected from the treatment system during monthly sampling event On 31 January 2002, only an effluent stream samples was collected from the treatment system I On 13 November 2001, 14 January 2002, 11 February 2002 mid-treatment steam samples were also collected to analyze for MTBE break-though The influent samples were collected from the discharge line from the 500-gallon sediment tank The mid-treatment sample was collected from a dedicated brass sampling port at the inlet to the second ' GAC vessel Samples were also collected from the effluent stream of the discharge of the treatment from a dedicated in-line sampling port 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 a sample preservative, and 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 McCampbell Analytical Inc (MAI),a DHS-certified laboratory,for analysis Effluent samples were analyzed for all of the following analytes, while influent and mid-treatment samples were analyzed for the first three listed analytes only • 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, • Benzene,toluene,ethyl benzene and xylene(BTEX)with methyl-tertiarybutyl ether (MTBE) by EPA Methods 8020 • 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 GcoEnviron mental Inc