Laserfiche WebLink
680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> (D Sequoia 404 N Wiget lane walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> (,,D Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9ZI-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Ask <br /> alta Environmental Client Protect ID Exxon 7-3708, DO93-809 <br /> 3164 Gold Camp Road, #200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jim Brownell QC Sample Group 9903430-10 Reported Mar 28 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst BTF <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC031799BTEX30A <br /> Sample No GWLCS031799A <br /> Date Prepared 3117199 3117199 3117199 3117199 <br /> Date Analyzed 3117199 3117199 3117199 3117199 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Conc , uglL N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, uglL 96 92 90 27 <br /> % Recovery 96 92 90 90 <br />• Matrix <br /> Spike Duplicate, uglL 96 93 91 28 <br /> % Recovery 96 93 91 93 <br /> Relative % Difference 00 11 1 1 33 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# <br /> Date Prepared <br /> Date Analyzed <br /> Instrument I D# <br /> Conc Spiked, ug/L <br /> LCS Recovery, ug/L <br /> LCS % Recovery <br /> Percent Recovery Control Limits <br /> NISIMSD 60-140 60140 60140 60140 <br /> LCS 70130 70-130 70-130 70-130 <br /> Quality Assurance Statement Alt standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matnx that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matnx spike is an aliquot of sample <br /> 1/�1�,, farufied with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> C&44� !` � �111� the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> David A Pichette <br /> Project Manager <br />