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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project ID Unocal, 7303 Pac>fic Ave , Stockton <br /> 401 Stanwell Or, Ste 400 Matrix Water <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 3060894-897 Reported Jul 1, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Acenaphthene 4-Nitrophenol 2,4-Dinitro- Pentachloro Pyrene <br /> toluene phenol <br /> Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst Son Le Son Le Son Le Son Le Son Le <br /> Conc Spiked 100 200 100 200 100 <br /> Unrts Ng/L ug/L kg/L ug/L lig/L <br /> LCS Batch# LCS052293 LCS062293 LCS062293 LCS062293 LCS062293 <br /> Date Prepared 6/22/93 6/22/93 6/22/93 6/22/93 6/22/93 <br /> Date Analyzed 6/23/93 6/23/93 6/23/93 6/23/93 6/23/93 <br /> Instrument I D # GC/MSI GC/MS1 GC/MS1 GC/MS1 GC/MSI <br /> LCS % <br /> i Recovery 68 54 64 53 100 <br />=Control Limits 46-118 1080 24-96 9-103 26 127 <br /> MS/MSD <br /> Batch # BLK062293 BLK062293 BLK062293 BLK062293 BLK062293 <br /> Date Prepared 6/22/93 6/22/93 6/22/93 6/22/93 6/22/93 <br /> Date Analyzed 6/23/93 6/23/93 6/23/93 6/23/93 6/23/93 <br /> Instrument I D # GC/MS1 GC/MS1 GC/MS1 GC/MS1 GC/MS1 <br /> Matrix Spike <br /> % Recovery- 66 54 64 53 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 78 62 72 56 108 <br /> Relative % <br /> Difference 17 14 12 55 77 <br /> Please Note <br /> EQUOIA AN ICAL The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents <br /> f preparation 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 OC limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> m <br /> n B Kemp <br /> Project Manager Page 2 of 2 <br /> 3060894 KEI <9> <br />