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4-01-1997 8 d8AM FROM AGE NC 209 956 0700 P 5 CASTLE ANALYTICAL LABORATORY Environmental Testing Services P 0 Box 1360 Wanton CA 95388 phone 1209] 384-2930 Certificate #2079 Fax (209) 384-1507 Advanced GooEnvironmental Inc Client Project ID Comfort Air,Inc Method EPA 503018015M,8020 of Northern California Reference Number 1023 Instrument ID Ver GC1 1803 West March lane 5vae A Matrix Water Prepared 2 24 97 Stockton,CA 95207 Analyst Jim Phillips Analyzed 2-24-97 Arta Tim Cuellar Reported 3-397 QVAUTY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylene Spike Concentration 100 1 00 100 1 00 100 200 Units ug/L ug/L ug/L u911. ug/L u911. LCS Batch# VG-2247W VB-2247W VB-ZZ47W V8-2247W VB 2247W V13-2247W LCS %Recovery 104% 111% 955% 102% 987% 101% Surrogate Recovery 102% 101% 101% 101% 101% 101% • Control Limits 70-130 % 70130% 70-130% 70-130% 70130% 70-130 % MSIMSD Batch if VG 2247W VS-2247W VB-2247W VB 2247W VS-2247W VB-2247W MS 95 Recovery 852% 100% 860% BB 7% 947% 9Z 7% Surrogate Recovery 100% 965% 965% 965% 965% 965% MSD % Recovery 89 1% 124% 860% 866% 938% 920% Surrogate Recovery 983% 963% 963% 963% $63% 963% Relative % bifft+rence 429% 21 5% 0045% 2 13% 0976% 0823% Methenol8lank ND ND ND ND ND ND Surrogate Recovery 105% 104% 104% 104% 104% 104% The LCS lLaboratory Check Sample) is a control sample of known interferent free matrix that is fortified with representative analytes and analyzed using the same reagents preparation and analytical methods employed for the samples The LCS % recovery is used for validation of sample batch results Due to matrix effects,the 4C limas and recoveries for MSIMSD`s are advisory only and are not used to accept or reject batch results ANALYST rlamocw APPROVED BY • ChWF,l Cone jqm#W Phdlips + F.n rontrtental Lab Drraetor