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Ci) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> Analytical 819 Sinker Avenue Suite 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 0342 <br /> 0 <br /> MCON- Sac Project ARCO 548, Stockton,CA <br /> 433 N Market Blvd Project 9129/98 <br /> Project Number 21775-206 003 Received 9/30/98 <br /> acramento, CA 95834 Project Manager Dave Foley Reported I0/14/98 <br /> Total Purgeable Hydrocarbons(C6-C1 Z), BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical -Sacramento \ <br /> Date Spike Sample QC Reporting Lunt[Recov RPDRPD <br /> nalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes• <br /> UdL�12SiQ4$ Date P-repared-Jk&M Extraction M!ClbQd. EPA 5030B(1211 <br /> hilt _BLKI <br /> irgeable Hydrocarbons 10/8/98 ND ug/l 50 0 <br /> nzene ND 0 500 <br />�luene �� <br /> " <br /> hylbenzene ND 0500 <br /> 0 500 <br /> rlenes(total) " ND " <br />:thyl tert-butyl ether 0 500 <br /> ND " 5 00 <br /> rrogate aaa-D'i luororoluene 10 0 101 <br /> 60 0-140 102 <br /> 8100098-113SI <br /> nzene 10/8198 100 <br /> luene ]08 ugl! 700-130 108 <br /> 100 103 1. 700-130 103 <br /> iylbenzene 100 9 93 700-130 993 <br />]e tai} 300 297 700-130 990 <br /> th -butyl ether 100 123 700-130 123 <br /> rogate a a a-Trtfluorotoluene IO 0 104 600-140 104 <br /> trix Spike 810909_$-MS1 S809324-10 <br /> Izene 10/8/98 100 ND 104 u /1 <br /> uene g 60 0-140 104 <br /> 100 ND 987 <br /> 600140 987 <br /> ylbenzene 100 ND 9 7878 -60 0-140 97 8 <br /> enes(total) 300 ND 296 60 0-140 98 7 <br /> hyl Cert-butyl ether 100 ND 11 8 60 0-140 18 <br /> 1 <br /> agate a a a-Trfluorotoluene 10 0 965 60 0-140 91 S <br /> Els Spike Duo $100098 MSD1 5809324-10 <br /> zene 16/8/98 100 ND 107 ug/l 600-140 107 25 0 2 84 <br /> lenc 10 0 ND 9 80 60 0 l40 98 0 25 0 0712 <br />(benzene [0 0 ND ]0 0 600-140 (OD 25 0 2 22 <br /> nes(total) 300 ND 302 60 0-140 101 25 0 2 30 <br /> ag9tent-butyl ether !0 0 ND 13 2 600-140 132 250 11 2 <br /> gate aaa-Trifluorotoluene 10 0 9 84 <br /> 600-140 98 4 <br /> h. 8100108 Date Prep 9198 Extraction Mdho—LEA-50013(PIT) <br /> R $100108-RLK1 <br /> cable Hydrocarbons 1019198 ND ug/l 500 <br /> ene ND 0 500 <br /> ane ,. <br /> benzene <br /> ND 0 500 <br /> ies(total) ND 0 500 <br /> ylutyt ether ND 0 500 <br /> " ND " 500 <br /> na Analytical -Sacramento "Refer to end ofreport for text of notes and definitions <br /> d W Sobel,Client Services Representative <br /> Page 5 of 9 <br />