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CA.Science <br />&-pWronmental <br />A, aboratories, Inc. <br />CASE NARRATIVE <br />Calscience Work Order No.: 11-09-1580 <br />Client Reference: ExxonMobil 99CAS/022789C <br />Page 3 of 27 <br />Four (4) soil samples were received for Calscience work order 11-09-1580 on <br />September 23, 2011. Testing was performed in accordance with the chain -of -custody <br />instructions. <br />EPA 8260B- <br />LCS/LCSD Batch 1109281_06 and 110928L07: All target analytes were within <br />acceptance criteria with the exception of 1,1-Dichloroethene. The LCS/LCSD RPD for <br />this analyte was above the upper control limit. The MS/MSD % recoveries were within <br />the control limits and the associated samples were non -detect, thus, the sample data <br />was reported without further clarification. <br />LCS/LCSD Batch 1109281_06 and 110928L07: All target analytes were within <br />acceptance criteria with the exception of Ethanol. The LCS/LCSD % recoveries for this <br />analyte were above the upper control limit of 140%, but were below the NELAC-defined <br />upper marginal exceedance (ME) limit of 154% (ME _ +/- 4 standard deviations.) Based <br />upon the number of analytes spiked into the LCS/LCSD, and per NELAC, the laboratory <br />is allowed to report associated data when there is, in this case, one marginal <br />exceedance in an LCS. <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 • TEL:(714) 895-5494 • FAX:(714) 894-7501 <br />