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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> c916) 921-9600 • FAX (916) 921 0100 <br /> Aegis Environmental Consultants Client project 10 Shell 141 N Ef Dorado, Stockton <br /> 1050 Melody Lane, Ste 160 Matrix Water <br /> Roseville CA 95678 <br /> Attention Paul Graff QC Sample Groua 3110198-200 Reported Nov 18 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYZE Benzene Toluene =*hyl- Xylenes _eacl Mercury Cadmium <br /> 3enzene <br /> Methoo EPA 8020 Ea4 8020 =°b 8020 EPA 8020 EPA 200 7 EPA 245 t EPA 200 7 <br /> ' Analyst Chiaravailoti Chiaravailoti .iaravanon Chiaravadoti S Foster S Foster S Foster <br /> MS/MSD <br /> Batch# 3110501 :110501 CEO 3110501 3110494 31-K1 11193 3110494 <br /> Date Prepared 11 12 93 1/12 93 - 1/12193 11/16/93 1 1/11/93 11/16/93 <br /> Date Analyzed 11/12'93 1/12/93 C 33 11/12/93 11/17/93 11/11/93 11/1793 <br /> Instrument I D # . P2 -P2 HP 2 PE-40 Sri-loon RE-40 <br /> Colic. Spiker] 0 ug/L 0 Ua/L - - 30 ug/L 0 50 mg/L 0 0050 mg/L 0 10 mq/L <br /> Matrix Spike <br /> % Recovery b e0 _ 03 87 114 88 <br /> Matrix Spike <br /> M Duplicate % <br /> Recovery C :9 100 85 107 91 <br /> Relative % <br /> Difference 3 a 23 6 3 34 <br /> LCS Batch# <br /> Hate Prepared. <br /> Date Analyzect <br /> Instrument I D # <br /> LCS 0% <br /> R ecovery <br /> '16 Recovery <br /> Control Limits 60-120 80-120 30-120 80-120 80-120 80-120 80-120 <br /> Please Note I <br /> The LGS is a control sample OT known,interferent tree matrix that is analyzed using the same reagents, I <br /> SEQUOIA ANALYTICAL preparation and analvtical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified wren known Quantities oT soecr•ic comocuncls arta subjected to the entire analytical proceoure if <br /> 'he recovery of analvtes Trom the matrix spike class not fall within specified control limits due to matrix <br /> �interterence the LCS recovery Is to De used to validate the batcn <br /> L€ncla C Schneider <br /> Project Manager 3110198 AEG <11> <br />