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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: EPA5030/8015M <br /> 4539 N. Brawley Ave. Suite 108 Lab Reference Number: 1910022 Instrument ID: VAR-GC1 <br /> Fresno, CA 93722 Sample Description: Soil Extracted: 10-10-19 <br /> Attn: Steve Curra Analyzed: 10-10-19 <br /> Reported: 10-16-19 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline <br /> Spike Concentration: 4.40 <br /> Units: mg/kg <br /> LCS Batch #: VS-0109 <br /> LCS % Recovery: 92.9% <br /> Surrogate Recovery: 110% <br /> Control Limits: 70-130 % <br /> MS/MSD Batch #: VS-0109 <br /> MS % Recovery: 74.8% <br /> Surrogate Recovery: 87,4% <br /> MSD % Recovery: 78.3% <br /> Surrogate Recovery: 93. 1 % <br /> Relative % Difference: 4.66% <br /> Method Blank : ND <br /> Surrogate Recovery: 99.6% <br /> Please Note: <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified 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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> APPROVED BY: <br /> Clan . Cone 1LabqfaVoJ irector <br /> Cassandra J.A. Na ney / Chemist <br />