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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 <br /> Certificate #2480 Fax: (209) 384-1507 <br /> Technicon Engineering Client Project ID: 180321 Method: EPA 5030/8015M ,8021B <br /> 4539 N. Brawley Ave. Suite 108 Lab Reference Number: 1805035 Instrument ID: HP-GC1 <br /> Fresno, CA 93722 Sample Description: Soil Extracted: 05-15-18 <br /> Attn: Steve Curra Analyzed: 05-15-18 <br /> Reported: 05-16-18 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration: 4.40 102 50.4 398 93.4 458 <br /> Units: mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch #: VS-5158 VS-5158 VS-5158 VS-5158 VS-515B VS-5158 <br /> LCS % Recovery: 98.7% 101 % 105% 99-9% 93.6% 96.6% <br /> 103% 105% 105% 105% 105% 105% <br /> Control Limits: 70-130 % 70A30 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch #: VS-5158 VS-5158 VS-5158 VS-5158 VS-5158 VS-5158 <br /> MS % Recovery: 72.8% 82.6% 83.6% 83.0% 73. 1 % 76.5% <br /> Surrogate Recovery: 74.6% 81 .5% 81 .5% 81 .5% 81 .5% 81 .5% <br /> MSD % Recovery: 75.3% 87.8% 85. 1 % 83.5% 73.9% 77.3% <br /> Surrogate Recovery: 78.0% 81 .4% 81 .4% 81 .4% 81 .4% 81 .4% <br /> Relative % Difference: 3. 18% 6.08% 1 .67% 0.557% 1 . 14% 0.976% <br /> Method Blank : ND ND ND ND ND ND <br /> Surrogate Recovery: 95.7% 104% 104% 104% 104% 104% <br /> Please Note: <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is forted with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS % recovery is used for validation <br /> of sample batch results. Due to matrix effects, the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> ,elect batch results. <br /> APPROVED BY: C_ <br /> A <br /> 4filipliabo)r-atory Director or <br /> Clari J. Canratory Manager <br /> ENVIRONMENTAL HEALTH <br /> DEPARTMENT <br />