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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 • FAX (916) 921 0100 <br /> Aegis Environmental Consultants Client Project ID Shell, 141 N E1 Dorado, Stockton M n <br /> 1050 Melody Lane, Ste 160 Matrix Water <br /> oseville CA 95678 <br /> Attention Paul Graff QC Sample Group 3110198-200 Reported Nov 18 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Phenol 2-Chicropnenot 4-Uichioro- N-Nitroso-oi- 12,4-Tnchlora- 4-Chloro-3. <br /> benzene n-oropyiamrne benzene methylphenol <br /> Method EPA 625 EPA 625 =P4 625 EPA 625 EPA 625 EPA 625 <br /> Analvst E Manuei E Manuei = Manuel E Manuel E Manuel E Manuel <br /> MS/MSD <br /> Batch# 931137901 931137901 _31137901 331137901 931137901 931137901 <br /> Date Prepared 1119/93 11/9/93 9193 11/9/93 11/9/93 11/9/93 <br /> Date Analyzed 11/12/93 i 1/12/93 1 12 93 11/12/93 11/12/93 11/12/93 <br /> Instrument 10 # F4 974 =4 F4 F4 F4 <br /> Conc Splkea X00 ng 00 na 3 na 550 ng 50 ng 100 ng <br /> Matnx Spike <br /> 0,6 Recovery 99 96 -3 98 84 89 <br /> Matrix Spike <br /> 0 Duplicate % <br /> Recovery 05 01 =6 92 86 89 <br /> Relative% <br /> Difference = 9 � 1 - 63 24 00 <br /> LCS Batch# - <br /> Date Prepared - - <br /> Date Analyzed <br /> Instrument I D # <br /> LCS % <br /> Recovery <br /> 0 ecovery <br /> Control Limrts• I <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is wmwad Merle to awne re"em, <br /> SEQUOIA ANALYTICAL preparation anti analytical methods emoloyed for the samples The matrix spike is an aliquot of samole <br /> fortified with known ouarttlties of soecitrn compounas and sublectea to the entire analvbcal procedure it <br /> - - <br /> the recovery of analytes trom the matrix spike does not fall within specified control limits due to matrix <br /> -� <br /> interference the LCS recovery rs to ba used to validate the batch <br /> Linda C Schneider <br /> Project Manager 3110198 AEG <15> <br />