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0 0 <br />Brusca File No. 137-002 <br />Page 3 <br />March 5, 2018 <br />Murphy Parkway Property Soil Gas Monitoring <br />SOIL GAS LABORATORY TESTING <br />The soil gas samples collected from soil gas monitoring wells SGMW1 and SGMW2 were <br />transported to a State -certified laboratory for analysis. Both soil gas samples were analyzed for <br />methane, oxygen, carbon dioxide, and nitrogen by ASTM Method D1946. The samples also <br />were analyzed for VOCs by EPA Test Method TO -15. The analytical laboratory results are <br />summarized on the attached Table 1, along with data from past monitoring. The laboratory <br />reports, internal laboratory QA/QC data, and chain -of -custody documentation also are attached. <br />RESULTS AND DISCUSSION <br />As shown on Table 1, the soil gas samples collected for monitoring wells SGMW1 and SGMW2 <br />in February 2018 did not contain methane at concentrations above the laboratory reporting limit <br />of 0.00023%. Additionally, neither of the soil gas samples contained any of the tested VOCs at <br />concentrations above the laboratory reporting limits. <br />SUMMARY AND CLOSING <br />As described herein, our firm conducted monitoring/sampling of the two soil gas monitoring <br />wells (SGMW1 and SGMW2) at the subject property in February 2018. The purpose of the soil <br />gas monitoring program is to evaluate whether soil gas contaminants, including methane and <br />VOCs, exist at the westerly margin of the property as a result of uncharacterized subsurface <br />wastes that reportedly exist offsite to the west of the subject property. Data from the February <br />2018 monitoring event do not indicate elevated concentrations of methane or VOCs in soil gas at <br />the monitoring well locations. The next monthly monitoring event (March 2018) will take place <br />later this month. <br />This report will be submitted to the SJCEHD, CalRecycle, and the CVRWQCB. If you have <br />any questions or require additional information, please contact the undersigned at (916) 677- <br />1470. <br />Sincerely, <br />BR USCA ASSOCIATES, INC. <br />Jo Brusca <br />ncipal Engineering Geologist <br />Certified Engineering Geologist No <br />1948 <br />JOSEP' <br />BRUSCA <br />NO, 19+48 <br />CEfMFIED <br />ENGINEERING <br />GEOLOGIST ti4` <br />OF CP�� <br />