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1 <br /> • Aeenft—m;Weil bate Cdleaai TOTALPETROULM AROMAtIC V&.lLt ORCANIC AND OXYGENATES <br /> KYDROCARBCOS <br /> CAW(INE DIESEL BENZENE 10LUNE ETNA 011M TAME TW1,0Wand MTBE ::��] <br /> BENZENEEtlxnd <br /> Mntwwl <br /> 2/27/02 ND NA ND NO ND ND NO ND ND ND <br /> 5/21102 ND NA ND ND ND ND ND ND ND ND <br /> MW-6 2112/00 ND ND ND NO ND ND ND ND ND ND <br />/ 4128/00 ND ND ND ND ND ND ND ND ND ND <br /> 9120100 ND ND ND ND ND ND ND ND ND ND <br /> 12/27/00 NO NO ND ND NO ND ND NO NO NO <br /> 7/30/01 ND ND NO ND ND ND ND NO NO ND <br /> 1 11/5/01 NO ND NO ND NO ND ND NO NO ND <br /> 2/27/02 NO NA ND ND ND ND NO ND ND ND <br /> 5121/02 ND NA ND ND ND ND ND ND ND ND <br /> Note N D — Not Detected at Method Detection Limits <br /> N.A — Not Analyzed <br /> 1 Detection Limits EPA Method 82608 vanes most are —5 0 ppb <br /> The highest detection of MTBE encountered was 470 ppb found in MWO-1X, located 20 feet <br /> northeast of the former tank pit on the northern boundary of the subject property MWO-1 X <br /> is a deep horizon well which is screened from a depth of 20 feet bgs to the total depth of the <br /> 1 . well, 30 feet bgs The second highest detection of MTBE was 230 ppb found in groundwater <br /> monitoring well MW-3 located approximately 200 feet east of the former tank farm <br /> excavation. <br /> TABLE El <br /> 1 HISTORICAL GROUNDWATER INFORMATION <br /> (Bald designates most recent measurements) <br /> Monitoring Well Elevation of PVC Depth to Groundwater Elevation of Gradient Direction <br /> Groundwater <br /> 1 MW0-1 X 2/27/02 13 69 feet 7 68 feet +601 East <br /> MWO-1 X 5121102 13 69 feet 7 91 feet +578 East <br /> MWO-1 2127/02 13 27 feet 7 40 feet +587 East <br /> MWO-1 5121102 13 27 feet 7 79 feet +548 East <br /> MWO-2 2127102 13 75 feet 6 84 feet +691 East <br /> MWO-2 5121102 13 75 feet 8 20 feet +5.55 East <br /> MWO-3 2127102 1 14 65 feet 8 62 feet +603 East <br /> MWO-3 5121102 14 65 feet 8 89 feet +S76 fast <br /> • Avalon Environmental Consultants Project#9627-001-10 <br /> Joes Truck Plaza 15600 Saud/ Harlan Road <br /> August 19, 2002 4 Lathrop, California <br /> I <br />