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i <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> f Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 5030/801 5M,8020 <br /> I of Northern California Reference Number 1808 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 10-21-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 10-21-96 <br /> Attn Tim Cuellar Reported 1027-98 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 1 00 1 00 1 00 1 00 200 <br /> Units uglL ug/L uglL ug/L uglL uglL <br /> LCS Batch # VG-0218W VS 021 BW VB-0218W VB-0218W VS 0218W VB-0218W <br /> LCS % Recovery 942% 115% 100% 99 1% 986% 92 3% <br /> Surrogate Recovery 104% 101% 101% 101% 101% 101% <br /> Control Limits 70-130 % 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MSIMSD Batch # VG-0218W VB 021 BW VB-0218W VS-0218W VB 0218W VB-0218W <br /> MS % Recovery 809% -231% 364% 113% 109% 988% <br /> Surrogate Recovery 104% 999% 999% 99 9% 99 9% 999% <br /> MSD % Recovery 765% 101% 336% 104% 960% 980% <br /> Surrogate Recovery 103% 99 5% 99 5% 99 5% 99 5% 99 5% <br /> Relative % Difference 1 85% 294% 1 46% 7 16% 122% 0673% <br /> Methanol Blank ND ND ND ND ND ND <br /> ISurrogate Recovery 107% 107% 107% 107% 107% 107% <br /> ThU LCC I1 1,orat.._ �L....I c_�_._. <br /> �+ I�auuiawl y �. U61n aa11tPIC) I$d 1-UntrU1 3drllpM UT` Kilown, inierfereni Tree mairix inai is forilTiea wiin representative anaiytes ana <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation <br /> of sample batch results Due to matrix effects,the 11C limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> i <br /> s � <br /> ANALYST APPROVED BY <br /> Clary J Cone J es hrllips <br /> Environmental Lab arrector <br />