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` SEQUOIA ANALYTICAL <br /> 900 Bates Avenue o Suite LM 0 Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Ra Associates " Client Project CCS `Ajc6`#2088,Tract <br /> Y- <br /> ;k 1855 Gateway Blvd , Ste 770 Matnx Soil <br /> s Concord, CA 94520 <br /> F Attention Paul Supple QC Sample Group 3081134-1136 Reported Sep 2, 1993 <br /> [ ` v r <br /> 1 <br /> (QUALITY CONTROL DATA REPORT <br />' ANALYTE <br /> Ethyl- <br />' Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 7420 <br /> Analyst. J F J F J F J F K K <br /> Conc. Spiked 040 040 040 12 10 <br /> Units mg/K9 mg/K9 mg/K4 mg/K9 m9/K9 <br />' LCS Batch# 3LCS083093 3LCS083093 3LCS083093 3LCS083093 BLK082993 <br /> Date Prepared 8/30/93 8/30/93 8/30/93 8/30/93 8/29/93 <br />' Date Analyzed: 8/30/93 8/30/93 8/30/93 8/30/93 8/31/93 <br /> Instrument I D# HP-5 HP-5 HP-5 HP-5 SpectrAA-20 <br /> LCS °.6 <br /> Recovery los 107 104 102 sa <br /> Control Limits 7x-130 70-130 70-130 70-130 75-125 <br /> 1 i^"��h i�h v { r i 4� v♦v`}r Hti`~ r` , r ^ r . •YC} .` n . , `v v. .. '�` l µ x{�� l L <br />' MS/MSD <br /> Batch#. 3080898 3080898 3080898 3080898 3081136 <br /> Date Prepared 8/30/93 8/30/93 8/30/93 8/30/93 8/29/93 <br />' Date Analyzed- 8/30/93 8/30/93 8/30/93 8/30/93 8/31/93 <br /> Instrument 1.13# HP-5 HP-5 HP-5 HP-5 SpectrAA 20 <br />' Matrix Spike <br /> % Recovery 100 97 97 96 83 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery 102 100 100 97 78 <br /> Relative% <br /> Difference 19 3 0 30 10 62 <br /> S <br /> EQUOIA ANALYTICAL Please Nota <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> ara ion and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> F Lee <br /> Laboratory Director <br />' 3081134 ROU <3> <br />