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Y . molecules, MTBE will be found in the water stream between the hist a n d second canister Each carbon canister has been fitted with a sample poi t 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 are 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 water while the other canister is Spent and in the process of being replaced Currently, the schedule tos sample collection and analysis is quarterly (every 3 months) On October 30, 2001 , a water ~ample, labeled 17821 Aii pot t Way, w a s collected from the well during routine quarterly sample collection activities The sample was placed within an ice chest containing wet ice while transported to Kiff Analytical of Davis, California (FLAP# 2 2 3 6 ) under chain of custody procedures The sample was analyzed for total petroleum hydtocaibons as gasoline (TPH-G) benzene, toluene ethylbenzene and xylenes (collectively known as BTEX), the five fuel oxygenates, and lead scavenges s by EPA Method 8260B The s am p 1 e contained 38 part,, per billion (ppb) MTBE After the system was installed, started, and operating in early Januai v 2002, ASE collected a water sample after treatment y by the first GAC canister This sample was labeled 17821-GAC 1-1- 1 1-02 The sample wa,, placed within an ice chest containing wet ice while transported to Kift under chain of custody procedures The sample A as analyzed for TPH-G BTEX, five fuel oxygenates, and lead scavengers by EPA Method 826013 The sample contained no detectable concentrations of any o f the compounds analyzed A copy of the certified analytical repos is are attached in Appendix B WATER SAMPLE ANALYTICAI, RESjjjj • The only compound identified in sample 17821 Aiipoit Way (the pie- treated water sample) was MTBE at 38 ppb • No compounds were identified in ,ample 17821 -GAC1 - 1 - 11-02 which was collected after GAC canistei numbet 1 This pi over that the treatment system is woiking as designed, and that no MTBE of anN, other compounds analyzed ase entering the house's plumbing system - 2 -