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COULAB CORE LABORATORIES <br /> S U R R 0 G A T E R E C O V E R I E S R E P 0 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 /> 4-Bromofluorobenzere ug/L <br /> Lab ID Matrix QC Type Dilution Result True Value Percent Recovery Limits Flag Date Time <br /> 990877-21 Solid 1 9 23 10 000 92 3 55-112 05/27/1999 2022 <br /> ' 990877-17 Solid 1 9 93 10 000 99 3 55-112 05/27/1999 2046 <br /> 990877-15 Solid 250 9 80 10 000 98 0 55 112 05/27/1999 2128 <br /> 990877-21 Solid MS 1 9 72 10 000 97 2 55-112 05/27/1999 2147 <br /> 990877-12 Solid 1 9 72 10 000 97 2 55-112 05/27/1999 2211 <br /> 990877-21 Solid MSD 1 10 17 10 000 101 7 55-112 05/27/1999 2230 <br /> 990926-9 Solid 50000 9 66 10 000 96 6 55-112 05/27/1999 2336 <br /> Surrogate Units <br /> ' D i brorrof Luc rometh a ne_ ug/L <br /> Lab ID Matrix QC Type Dilution Result True Value Pu cent Recovery Limits Flag Date Tlmc <br /> LCS 1 10 09 10 000 100 9 79-132 05/27/1999 1507 <br /> Me 1 10 23 10 000 102 3 79-132 05/27/1999 1549 <br /> 90856 12 Solid 1 11 93 10 000 119 3 73-136 05/27/1999 1632 <br /> ' 990856-13 Solid 1 13 32 10 000 133 2 73-136 05/27/1999 1714 <br /> 990856-14 Sol 1d 1 11 68 10 000 116 8 73-136 05/27/1999 1756 <br /> 990856 16 Solid 1 11 40 10 000 114 0 73-136 05/27/1999 1838 <br /> 990877-7 Solid 1 10 84 10 000 108 4 73-136 05/27/1999 1921 <br /> 990877-9 Soled 1 10 96 10 000 109 6 73 136 05/27/1999 2003 <br /> ' 990877 21 Solid 1 11 36 10 000 113 6 73-136 05/27/1999 2022 <br /> 990877-17 Solid 1 11 10 10 000 171 0 73-136 05/27/1999 2046 <br /> 990877 15 Solid 250 10 21 10 000 102 1 73 136 05/27/1999 2128 <br /> 990877 21 Solid MS 1 10 52 10 000 105 2 73-136 05/27/1999 2147 <br /> 990877-12 SoI1d 1 11 31 lit 000 113 1 73-136 05/27/1999 2211 <br /> 990877-21 Solid MSD 1 10 77 10 000 107 7 73-136 05/27/1999 2230 <br /> 990926 9 Sotid 50000 10 66 10 000 106 6 73 136 05/27/1999 2336 <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 /> LCS 1 9 89 10 000 98 9 77-117 05/27/1999 1507 <br /> MB 1 9 58 10 000 95 8 77-117 05/27/1999 1549 <br /> ' 990856 12 Solid 1 10 09 10 000 100 9 81-116 05/27/1999 1632 <br /> 990856-13 Solid 1 9 64 10 000 96 4 81 116 05/27/1999 1714 <br /> 990856 14 Solid 1 9 76 10 000 97 6 81-116 05/27/1999 1756 <br /> 990856 16 Solid 1 10 31 10 000 103 1 81-116 05/27/1999 1838 <br /> ' 990877-7 Solid 1 9 65 10 000 96 5 81-116 05/27/1999 1921 <br /> 990877 9 Solid 1 9 83 10 000 98 3 81-116 05/27/1999 2003 <br /> 990877 21 Solid 1 10 74 10 000 107 4 81-116 05/27/1999 2022 <br /> 9908" 1/ Solid 1 10 27 10 000 102 7 81-116 05/27/1999 2046 <br /> 0877 15 Solid 250 10 33 10 000 103 3 81 116 05/27/1999 2128 <br /> 877 11 Solid M5 1 9 94 10 000 99 4 81 116 05/27/1999 2147 <br /> Page 49 <br />