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r , <br /> l <br /> Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W get Lane Walnut Creck CA 9-4598 (5 10) 988 96W FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc Client Project ID Arco 2133, Stockton` <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay OC Sample Group 6031041-45 Reported Apr 3, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. CL/BW CL/BW CL/BW CL/BW <br /> Concentration <br /> Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#* LCS032996 LCS032996 LCS032996 LCS032996 <br /> Date Prepared 03/29/96 03/29/96 03/29/96 03/29/96 <br /> Date Analyzed, 03/29/96 03/29/96 03/29/96 03/29/96 <br /> Instrument 11.11) #: GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br /> LCS % <br /> Recovery 90 92 95 95 <br /> Control Limits 75.125 75-125 75-125 75-125 <br /> r v a. • !.�n}+ y¢1>tiv)an}ry:•ruv.v»+rY+�+{ H^^ �� rN,v ry�rya r a a .n+ u as♦ > nT}'+pJtr�i ua}+xwov...ai +].L <br /> ' { J . .�r rv.a r ' lx{ {a o ♦>_. n w . wv r .. <br /> } ' r •, >v: ..w Yaw.r.w ♦'.a r +.av a.<.ivv.r v.vw vsv�.M1..'.a{n a }'}v s .. v r..rrxr M1 r . �.i Srir .*.`} ' .ar A' r{'f fi 3GXL•vtrrlC+.a t air~ > v. c ax a <br /> MS/MSD <br /> Batch# 6031042 6031042 6031042 6031042 <br /> Date Prepared 03/29/96 03/29/96 03/29/96 03/29/96 <br /> Date Analyzed 03/29/96 03/29/96 03/29/96 03/29/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 73 73 86 82 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 84 86 91 89 <br /> Relative % <br /> Difference 14 16 56 82 <br /> SEQUOIA ANALYTICAL Please Note <br /> / The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> `// validation of sample batch results Due to matrix effects the QC limits for MS/MSD's are advisory only <br /> inda C Schneider and are not used to accept or re)ect batch results <br /> Project Manager/Sacramento Laboratory <br /> 6031010 PES <12> <br />