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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON, TEXAS 77054 <br /> a tificate of Analysis No. H9-9809326-04 PHONE(713)660-0901 <br /> BP Oil Company <br /> 295 SW 41st St, Bldg 13 , Ste N P.O.# <br /> Renton, WA 98055 H405058, COC#095813 <br /> ATTN: Scott Hooton 09/17/98 <br /> PROJECT: #11195, PROJECT NO: 10-151-9-3 <br /> SITE: Lathrop, CA MATRIX: WATER <br /> SAMPLED BY: Alisto Engineering DATE SAMPLED: 09/03/98 <br /> SAMPLE ID: S-4 DATE RECEIVED: 09/09/98 <br /> ANALYTICAL DATA <br /> PARAMETER RESULTS PQL* UNITS <br /> Methyl t-Butyl Ether ND 10 ug/L <br /> tent-Amyl Methyl Ether ND 10 ug/L <br /> t-Butyl Alcohol ND 500 ug/L <br /> Ethyl t-Butyl Ether ND 10 ug/L <br /> Di-Isopropyl Ether ND 10 ug/L <br /> SURROGATES AMOUNT % LONER UPPER <br /> SPIKED RECOVERY LIMIT LIMIT <br /> 1, 2-Dichloroethane-d4 50 ug/L 98 76 114 <br /> Toluene-d8 50 ug/L 102 88 110 <br /> 4-Bromofluorobenzene 50 ug/L 90 86 115 <br /> ANALYZED BY : JC DATE/TIME: 09/11/98 03 : 11 : 00 <br /> METHOD: 8260 Water, Volatile Organics <br /> NOTES: * - Practical Quantitation Limit ND - Not Detected <br /> NA - Not Analyzed <br /> COMMENTS : <br /> QUALITY ASSURANCE: These analyses are performed in accordance <br /> with EPA guidelines for quality assurance. <br /> SPL California License # 1903 <br />