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I <br /> COHLAB CORE LABORATORIES <br /> S U R R O G A T E R E C O V E R I E S R E P O R T <br /> Job Number 991747 Report Date : 09/08/1999 <br /> CUSTOMER, IT Group PROJECT; Southland - Martinez ATTM: Bob Butler <br /> Method Volatile Organics by GC/MS Batch 8274 <br /> Method Code 8260OX Analyst gfb <br /> Surrogate Um is <br /> DibromofLuoromethane ug/L <br /> Lab ID Matrix OC Type Dilution Result True Value Percent Recovery Limits Flag Date Time <br /> LCs 1 22 85 25 000 91 4 57-162 09/01/1999 1013 <br /> MB 1 22 06 25 000 88 2 57-162 09/01/1999 1041 <br /> 1991744-2 Liquids 20 23 42 25 000 93 7 57-162 09/01/1999 1139 <br /> 991673-1 Liquids 1 23 38 25 000 93 5 57-162 09/01/1999 1208 <br /> 991745-7 Liquids 1 22 44 25 000 89 8 57-162 09/01/1999 1236 <br /> 991745-8 Liquids 1 22 65 25 000 90 6 57-162 09/01/1999 1305 <br /> 91745-9 Liquids 1 20 98 25 000 83 9 57-162 09/01/1999 1334 <br /> M1991747-1 Liquids 1 21 31 25 000 85 2 57-162 09/01/1999 1402 <br /> 991747-3 Liquids 1 22 81 25 000 91 2 57-162 09/01/1999 1500 <br /> 991747-5 Liquids 1 23 11 25 000 92 4 57-162 09/01/1999 1528 <br /> P745-6 Liquids 1 23 74 25 000 95 0 57-162 09/01/1999 1557 <br /> 45-6 Liquids MS 24 08 25 000 96 3 57-162 09/01/1999 1626 <br /> 45-6 Liquids MSD 25 16 25 000 100 6 57-162 09/01/1999 1655 <br /> 991745-2 Liquids 4 24 55 25 000 98 2 57-162 09/01/1999 1723 <br /> 991745-5 Liquids 40 23 11 25 000 92 4 57-162 09/01/1999 1752 <br /> 1991748-2 Liquids 1 23 04 25 000 92 2 57-162 09/01/1999 1849 <br /> 991748-3 Liquids 1 22 42 25 000 89 7 57-162 09/01/1999 1918 <br /> 991748-5 Liquids 1 21 74 25 000 87 0 57-162 09/01/1999 2016 <br /> 991747-2 Liquids 40 22 23 25 000 88 9 57-162 09/01/1999 2045 <br /> Method Volatile Organics -Aromatics Batch .. 8304 <br /> Method Code 80208X AnaLyst .: evd <br /> Surrogate Units <br /> 4-B romofluorobenzene ug/L <br /> Lab ID Matrix QC Type Dilution Result True Value Percent Recovery Limits Flag Date Time <br /> MB 49 43 50 0000 98 9 64-147 09/02/1999 1150 <br /> LCS 1 51 10 50 0000 102 2 64-147 09/02/1999 1307 <br /> LCD 1 51 35 50 0000 102 7 64-147 09/02/1999 1332 <br /> 1991727-7 Liquids 5 50 32 50 0000 100 6 64-147 09/02/1999 1403 <br /> 991728-6 Liquids 1 50 43 50 0000 100 9 64-147 09/02/1999 1454 <br /> 1991740-2 Liquids 25 50 16 50 0000 100 3 64-147 09/02/1999 1545 <br /> 991741-2 Liquids 1 51 99 50 0000 104 0 64-147 09/02/1999 1611 <br /> 991741-3 Liquids 1 49 90 5D 0000 99 8 64-147 09/02/1999 1636 <br /> 991741-4 Liquids 1 52 30 50.0000 104 6 64-147 09/02/1999 1702 <br /> 991744-2 Liquids 10 51 55 50 0000 103 1 64-147 09/02/1999 1728 <br /> 491745-3 Liquids 1 66 03 50 0000 132 1 64-147 09/02/1999 1753 <br /> 991745-5 Liquids 1 55 62 50 0000 111 2 64-147 09/02/1999 1819 <br /> 45-7 Liquids 1 51 57 50 0000 103.1 64-147 09/02/1999 2052 <br /> 45-8 Liquids 1 51 97 50 0000 103 9 64-147 09/02/1999 2118 <br /> 746-1 Liquids 1 49 79 50 0000 99 6 64-147 09/02/1999 2209 <br /> 991746-2 Liquids 1 50 88 50 0000 101 8 64-147 09/02/1999 2235 <br /> Page 11 <br /> m'I ermlylcli reauns apmans or nte�pretairo'u conlev�ed m ma report ora basad upon mfpmalion aryl melenN suppled by the Client for wnase­law.e Ina rant mnnal use m s report hes men mme The ana"mal results MIME or mlerprel9 t- <br /> 04—Ilprelent pre best ryopmenl of Cpe Leboretmas Gore Le Stones however makes na wamemy p mprasentetlon expeyy p mv—W any typo and espresaN daGlaene deme as to the prodvohwly proper aperat—p prpinabWe .1 <br /> airy dl 9"s r:oa,p Nh.mywrel prapeny wad p untl m-I--wM sadh report Is aaad w raked Iq lar any Iee wlutaoeyr TMS n%nO SMI not ba reproduced m wrww or m pert mthoal IM wnnan approval of Core Laboralarrec <br />