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molecules, MTBE will be Lound in the water stream between the fii st a n d second canister Each carbon canister has been fitted with a sample port which allows a sample to be collected and analyzed at prescribed intervals to determine at what point MTBE has broken through the first canister ASE will replace the canisters when they no longer aie effective at removing the MTBE from the water The system has been designed to always have an adequate supply of activated carbon in one vessel to treat a normal volume of watei while the othei canister is Spent and in the process of being replaced Curiently, the schedule foi sample collection and analysis is quaff ter l� (every 3 months) AIER SAMPLE COLLECTION AND ANALYSIS On October 29, 2001, a water sample labeled 17926 Airport Way, was collected from the Aell during routine quarterly sample collection activities The sample �� as placed within an ice chest containing wet ice while transpoi ted to Krff Analytical of Davis, Califoi nia (ELAP# 2 2 3 6 ) under chain of custody procedures The sample was analyzed foi total petroleum hydrocarbons as gasoline (TPH-G) benzene, toluene ethylbenzene, and xylenes (collectively known as BTEX) the fi-\e fuel oxygenates, and lead scavengers by EPA Method 8260B The sample contained 25 parts per billion (ppb) MTBE After the system was installed, started, and operating in mrd-December 2001, ASE collected a water sample after treatment by the first GAC canister This sample \\ as labeled 17926-GAC1-12 13 01 The sample was placed within an ice chest containing wet ice while transported to Krff under chain of custody procedures The sample was analyzed for TPH-G BTEX, five fuel oxygenates, and lead scavengers by EPA Method 8260B The sample contained 19 ppb MTBE A copy of the certified analytical reports are attached in -kppendix B Although a water samplz was collected ti om GAC #2 on 12-13-01 , by t h e time ASE was made aware of the i esults from GAC #l, the holding time had expired Because aSE believed thea e may have been a sampling o r laboratory error, ASE returned to the site on January 3, 2002 to collect another sample from GAC #1 This sample was labeled 17926-GAC 1 - 01 03 02 The sample was placed within an ice chest containing %yet ice while transported to Krff under chain of custody procedures The Sample was analyzed on a 48-hour RUSH turnaround for TPH-G BTEX, fire fuel oxygenates, and lead scavengers by EPA Method 8260B This sample also contained 19 ppb MTBE A copy of the certified analytical reports ai e attached in Appendix B - 2 -