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molecules, MTBE will be found in the water stream between the first and second canister Each carbon canister has been fitted with a sample poit. which allows a sample to be collected and analyzed at piescribed intervals to determine at what point MTBE has broken through the fiist canister ASE will replace the canisters when they no longer aie effective at removing the MTBE from the water The s\ stem has been designed to always have an adequate supply of activated carbon in one vessel to treat a not mal volume of �N ater while the other canister is spent and in t h e process of being replaced Currently, the Schedule for sample collection and analysis is quay terly (every 3 months) NATER SAMPLE COLLECTION AND ANALYSIS On October 30, 2001, a water sample, labeled 17886 Airport Way, was collected from the x�ell during routine quarterly sample collection activities The sample was placed within an ice chest containing wet ice while transported to Kiff Analytical of Da,,is, California (ELAP# 2 2 3 6) under chain of custod} procedures The sample was analyzed for total petroleum hydrocarbons as orasoline (TPH-G), benzene, toluene, ethylbenzene, and xylenes (collectively known as BTEX, the five fuel • oxygenates, and lead scavengers by EPA Method 8260B The sample contained 058 parts pei billion (ppb) MTBE Since this well had preNrously contained no-detectable concentrations of any of the compounds tested, and the residents no longer had a n alternative water supply ASE returned to the site to collect a confirmation «atei sample On December 6, 2001 , a \Natet sample, labeled 1 7 8 8 6 Airport Way, was collected from the well The sample was placed within an ice chest containing wet ice while transported to Krff Analytical of Davis, California (ELAP# 2236) under chain of custody procedures The sample was analyzed for TPH-G, BTEX, the fr%e fuel oxygenates, and lead scavenges s by EPA Method 8260B The sample again contained 058 p p b MTBE After the system was installed, started, and operating in early Febivary 2002, ASE collected a water sample after treatment by the first GAC canister This sample was labeled 17886-GAC1-02-06-02 The sample was placed within an ice chest containing wet ice while transported to Ktff 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 no detectable concentrations of any o f • the compounds analyzed. A copy of the certtfred analytical reports are attached in Appendix B - 2-