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680 Chesapeake Drive Redwood City CA 94063 {650) 364 9600 FAX(650) 364-9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creel[ CA 94598 (510)988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Sui[e 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792 1865 FAX(707)792-034Z <br />' EA Engineering Client Project ID Exxon 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br />' Attention Chnsta Marting QC Sample Group 9804C34-01-03,05-07 Reported Apr 27 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8015/8020 <br /> Analyst C Demartlnl <br />' ANALYTE Benzene Ethylbenzene Toluene Xylenes BTEX as TPH <br /> QC Batch # GC04239811TEX21 A <br />' Sample No GW9804C73-1 <br /> Date Prepared 4123198 4123198 4123198 4/23198 4/23198 <br /> Date Analyzed 4123198 4123198 4123198 4123/98 4123198 <br />' Instrument 1 D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Cone , ug/L N D N D N D N D N D <br /> Cone Spiked ug/L 10 10 10 30 60 <br />' Matrix Spoke ug/L 10 10 10 31 63 <br /> % Recovery 100 100 100 103 105 <br /> Matrix <br /> Spoke Duplicate, ug1L 10 10 11 31 65 <br /> % Recovery 100 100 110 103 108 <br />' Relative % Difference 0 0 0 0 9 5 0 0 28 <br />' RPD Control Limits 0-25 0-25 0-25 0-25 0-25 <br /> LCS Batch# GAWBLK042398A <br /> IDate Prepared 4123198 4123198 4123198 4123198 4123198 <br /> Date Analyzed 4123/98 4123198 4123198 4123198 4123/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br />' Cont: Spiked, ug/L 10 10 10 30 60 <br /> LCS Recovery ug/L 10 10 10 31 62 <br />' LCS % Recovery 100 100 100 103 103 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 60140 <br />' LCS 70130 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br />' The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICA preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the enure analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> RI hard Herling <br /> Project Manager <br />