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. ' Sequoia 68o Chcsapcakc F)n,c Redwood Cay CA 94063 (415) 364 9600 FAX(4t5) 364 9233 404 N Wigct Lane Walnut Crcck CA 94598 (51o) 988 9600 FAX(5 10)988 9673 Analytical 819 Stnkcr Avcnuc SuLte 8 Sacramento CA 95834 (916) 931 9600 FAX(916)921 0100 Pacific Environmental Group Inc Client Project ID Chevron #9-6258, Stockton CA 11315 Sunrise Gold Circle, #M Matrix Sod Rancho Cordova, CA 95742 Attention Roger Hoffmore QC Sample Group 6091 009-1 8 Reported Oct 1, 1996 QUALITY CONTROL DATA REPORT ANALYTE 1,1-Dlchloro- Chloro ethane Trichloroethene Benzene Toluene benzene Method EPA 8240 EPA 8240 EPA 6240 EPA 8240 EPA 8240 Analyst K Pocan K Pocan K Pocan K Pocan K Pocan Concentration Spiked 2500 ug/kg 2500 ug/kg 2500 ug/kg 2500 ug/kg 2500 ug/kg LCS.Batch# LCSW2696 LCS092696 LCSW2696 LCS092696 LCS092696 Date Prepared 09/26/96 09/26/96 09/26/96 09/26/96 09/26/96 Date Analyzed 09/26/96 09/26/96 09/26/96 09/26/96 09/26/96 Instrument LD # MS-F1 MS-F1 MS F1 MS-F1 MS-F1 • LCS %Recovery 138 los 102 100 102 Control Limits 65-135 70-130 70-130 70-130 70.130 M5/MSD Batch# 6090101 6090101 6090101 6090701 6090101 Date Prepared 09/26/96 09/26/96 09/26/96 09/26/96 09/26/96 Date Analyzed 09/26/96 09/26/96 09/26/96 09/26/96 09/26/96 Instrument l OX MS-F1 MS-F1 MS-F1 MS-F1 MS F1 Matrix Spike % Recovery 96 ss 9s 9(3 Matrix Spike Duplicate% Recovery 92 96 98 97 98 Relative% Difference 4 3 3 1 00 f 0 00 Please Note The LCS is a control sample of known Interferent free matrix that is analyzed using the same reagents SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for 0validationt of sample batch results Due to matrix effects the OC limits for MS/MSDs are advisory only (/,fir and are not used to acce t or re ect batch results Linda C Schneider Project Manager/Sacramento Laboratory 6091009 PES - 19