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COU' LAB CORE LABORATORIES <br /> eF <br /> S U R R O G A T E R E C 0 V E R I E S R E P O R T <br /> Job Number 990877 Report Date 05/31/1999 <br /> CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop <br /> Surrogate Units <br /> Toluene-d8 ug/L <br /> ' Lab ID Matrix OC Type Dilution Result True Value Percent Recovery Limits Flag Date Time <br /> 990877-12 Solid 1 10 27 10 000 102 7 81 116 05/2771999 2211 <br /> ' 990877-21 Solid MSD 1 10 26 10 000 102 6 81-116 05/27/1999 2230 <br /> 990926-9 Solid 50000 9 96 10 000 99 6 81 116 05/27/1999 2336 <br /> Method Volatile Organics (Client List) Batch 6477 <br /> ' Method Code 8260C Analyst am <br /> Surrogate Units <br /> ' 4-Bromofluorobenzene ug/L. <br /> Lab ID Matrix QC Type Dilution Result Irur Value Percent Recovery Limits Flag Date Time <br /> 0856 5 Liquids 1 9 79 10 000 97 9 45-112 05/25/1999 2054 <br /> 0856 5 Liquids MS 10 10 10 000 101 0 45-112 05/25/1999 2136 <br /> 90856 5 Liquids MSD 9 92 10 000 99 2 45-112 05/25/1999 2219 <br /> LCS 1 10 61 10 000 106 1 45-112 05/27/1999 1856 <br /> M3 1 9 04 1C 000 90 4 45-112 05/27/1999 1940 <br /> 990877 21 Solid 1 9 23 10 000 92 3 55-112 05/27/1999 2022 <br /> 990877-22 Solid 1 9 56 10 000 95 6 55-112 05/27/1999 2105 <br /> 990877-21 Solid MS 9 72 10 000 97 2 55 112 05/27/1999 2147 <br /> ' 990877-21 Solid MSD 1C 17 10 000 101 7 55-112 05/27/1999 2230 <br /> 990871-1 Liquids 50 9 29 10 000 92 9 45 112 05/27/1999 2312 <br /> 990871-2 Liquids 50 9 21 10 000 92 1 45-112 05/27/1999 2354 <br /> 990871-3 Liquids 50 9 72 10 000 97 2 45 112 05/28/1999 0037 <br /> 990871-4 Liquids 50 9 72 10 000 97 2 45-112 05/28/1999 0120 <br /> 990871-5 Liquids 50 9 29 10 000 92 9 45-112 05/28/1999 0202 <br /> 990871-6 Liquids 50 9 51 10 000 95 1 45-112 05/28/1999 0245 <br /> 990871-7 Liquids 5C 9 41 10 000 94 1 45-112 05/28/1999 0328 <br /> 990871-8 Liquids 50 10 18 10 000 101 8 45-112 05/28/1999 0411 <br /> ' 990882-1 Liquids 1 10 17 10 000 101 7 45-112 05/28/1999 0453 <br /> 990882-2 Liquids 1 9 10 10 000 91 0 45-112 05/28/1999 0536 <br /> Surrogate Units <br /> Dibromofluoromethane ug/L <br /> ' Lab ID — Matrix— OC Type Dilution Result -- True Value Percent Recovery Limits Flag Date Time <br /> 990856-5 Liquids 1 10 02 10 000 100 2 79-132 05/25/1999 2054 <br /> 990856-5 Liquids MS 10 49 10 000 1G4 9 79 132 05/25/1999 2136 <br /> 990856-5 Liquids MSG 10 25 i0 000 102 5 79-131 05/25/1999 2219 <br /> LCS 1 10 48 10 000 104 8 79-132 05/27/1999 1856 <br /> M8 1 11 88 10 000 118 8 79 132 05/27/1999 1940 <br /> 990877 21 Solid 1 11 36 10 000 113 6 73-136 05/27/1999 2022 <br /> lo0877 22 Solid 1 10 89 10 000 108 9 73 136 05/27/1999 2105 <br /> 0877 21 Solid MS 10 52 10 000 105 2 73-136 05/27/1999 2147 <br /> Page 5C <br />