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Sequoia 680 Chcsapcakc (7n-c Rcdkood C-ty CA 94063 (4151 364 9600 FAX (415) 364 9233 <br /> 404 N Wigct Lanc Walnut Crcck CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Striker Avenue Su-1C 8 Sacramcnto CA 95834 (916) 921 96W FAX(916)921 0100 <br /> Analytical <br /> Pacific Environmental Group, Inc Client project Ib Chevron #9-6258, Stockton, CA <br /> 11315 Sunrise Gold Circle #M Matrix Sod <br /> Rancho Cordova, CA 95742 <br /> Attention Roger Hoff more OC Sample Group 6091009-18 Reported Oct 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Oil&Grease Lead Cadmium Molybdenum Silver Mercury_ <br /> Method SM 5520 EF EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 7471 <br /> Analyst LM/JJ K Barta K Barta K Barta K Barta K Barta <br /> Concentration <br /> Spiked 500 mg/kg 50 mg/kg 50 mg/kg 5o mg/kg 50 mg/kg 0 25 mg/kg <br /> LCS Batch# LCS092496 LCS092596 LCS0925% LCS092596 LCS092596 LCS092496 <br /> Date Prepared 09/23/96 09/25/96 09/25/96 09/25/96 09/25/96 09/24/96 <br /> Date Analyzed 09/23/96 09/27/96 09/27/96 09/27/96 09/27/96 09/26/96 <br /> instrument I D # BAL 4 ECP-1 ICP-1 ICP-1 lCP-1 AA 1 <br /> • LCS % <br /> Recovery 95 92 91 90 89 82 <br /> Control Limits 70-130 80-120 80.120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch # 6090503 6091018 6091018 6091018 6091018 6090815 <br /> i <br /> Date Prepared 09/23/96 09/25/96 M/25/96 09/25/96 09/25/96 09/24/96 <br /> Date Analyzed* 09/23/96 09/27/96 09/27/96 09/27/96 09/27/96 09/26/96 <br /> Instrument I D # BAL.4 ICP-1 ICP-1 ICP 1 ICP-1 AA-1 <br /> Matrix Spike <br /> %Recovery 85 64 64 48 64 61 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 86 63 64 48 64 57 <br /> Relative % <br /> Difference 1 2 16 00 00 00 68 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> • SEQUOIA ANALYTICAL 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 /> / C 1%� G ` � � and are not used to accept or reject batch results <br /> aZ <br /> / inda C Sch elder ' <br /> Project Manager/Sacramento Laboratory <br /> 6091009 pES <17- <br />