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i 4 After receiving this second set of data, ASE and the GAC canister supplier were certain that thele existed a plumbing problem within the first GAC canister and went back to the site to assess and repair the problem On January 9, 2002, ASE personnel removed the top of the GAC canister to find that the centei pipe inside the canister was not positioned coirectly The GAC canister is designed to work by a down-flow process Watei enters the canister at the top and is pushed through the GAC in a downward fashion At the bottom of the canistei exists a slotted-piping manifold with a solid pipe riser Tieated watet enters the manifold, goes up the center pipe and then exists the canister The problem with this canistei was that the center pipe was out of position and blocked by the top of the canistei not allowing the do�\ n-tlow pioc.ess to woik Aftei iepositioning the centei pipe, the canistei was put back together ASE tetuined to the site on Januaiy 10, 2002 to collect anothei sample from GAC #1 This sample was labeled 17926-GAC1-01 10 02 The sample was placed within an ice chest containing wet ice while transported to Kiff under chain of custody procedures The sample was analyzed on a 48-hour RUSH turnaround for TPH-G, BTEX, five fuel oxygenates, and lead scavengers by EPA Method 8260B This sample contained no detectable concentrations of any of t h e compounds analyzed A copy of the certified analytical reports ai e attached in Appendix B REMOVAL OF ALTERNATIVE. WATER SUPPLY The Aetopure Water alternative water supply was disconnected from the plumbing system after the system's performance was evaluated and found to be operating as designed SAMPLINGQUARTERLY OPERATION AND MAIXTEXANCE, REPORTIN[7 ASE is currently under contiact to perform quaffterly operation and maintenance (O&M) activities and collect samples and prepare a i epos t every 3 months to determine the effectiveness of the treatment system ASE will visit the site periodically to check the petfoimance of the System backflush the carbon canistei s if necessai y, and i epaii any problems that ai i,,e ASE will also collect influent (pie-treatment) and after carbon canister (post-treatment) water samples every three month,, foi analysis of TPH-G BTEX, the five fuel oxygenates, and lead scavengeis by EPA Method 8260B - 3-