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fax ( 3' EIVED 22018 ENVIRONMENTAL. CASTLE ANALYTICAL LABORATORY HEALTH DEPARTMENT` Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 Certificate #2480 Fax: (209) 384-1507 Technicon Engineering Client Project ID: 180321 Method: EPA 5030/8015M ,8021 B 4539 N. Brawley Ave. Suite 108 Lab Reference Number: 1805035 Instrument ID: HP-GCI Fresno, CA 93722 Sample Description: Soil Extracted: 05-15-18 Attn: Steve Curra Analyzed: 05-15-18 Reported: 05-16-18 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 4.40 102 50,4 398 93.4 458 Units: mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg LCS Batch #: VS-5158 VS-5158 VS-5158 VS-5158 VS-5158 VS-5158 LCS % Recovery: 98.7% 101 % 105% 99.9% 93.6% 96.6% 103% 105% 105% 105% 105% 105% Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % MS/MSD Batch #: VS-5158 VS-5158 VS-5158 VS-5158 VS-5158 VS-5158 MS % Recovery: 72.8% 82.6% 83,6% 83,0% 73.1 % 76.5% Surrogate Recovery: 74.6% 81 .5% 81 .5% 81 .5% 81 .5% 81 .5% MSD % Recovery: 75.3% 87,8% 85. 1 % 83.5% 73,9% 77.3% Surrogate Recovery: 78.0% 81 .4% 81 .4% 81 .4% 81 .4% 81 .4% Relative % Difference: 3, 18% 6.08% 1 .67% 0.557% 1 .14% 0.976% Method Blank : NO NO ND NO NO NO Surrogate Recovery: 95.7% 104% 104% 104% 104% 104% Please Note: The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS % recovery is used for validation 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 reject batch results. APPROVED BY: James C. Phillip / Laboratory Director or Clari J. Cone / 11aboratory Manager