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Brusca File No. 137-002 <br /> <br />Page 3 <br />January 8, 2021 <br />Murphy Parkway Property Soil Gas Monitoring <br /> <br /> <br />SOIL GAS LABORATORY TESTING <br /> <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 I, along with data from past monitoring. The laboratory <br />reports, internal laboratory QA/QC data, and chain-of-custody documentation also are attached. <br /> <br /> <br />RESULTS AND DISCUSSION <br /> <br />As shown on Table I, the December 2020 soil gas samples collected from SGMW1 and SGMW2 <br />did not contain methane at a concentration above the laboratory reporting limits of 0.00024% <br />and 0.00023%, respectively. Methane concern at the site is not indicated by the December 2020 <br />data. Additionally, the soil gas samples collected from monitoring wells SGMW1 and SGMW2 <br />in December 2020 did not contain any of the tested VOCs at concentrations above the laboratory <br />reporting limits. <br /> <br /> <br />SUMMARY AND CLOSING <br /> <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 December 2020. 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 December <br />2020 monitoring event do not indicate concentrations of methane or VOCs in soil gas at the <br />monitoring well locations that are considered a concern. The next monitoring event will take <br />place in the first quarter of 2021. <br /> <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 /> <br /> <br />Sincerely, <br /> <br />BRUSCA ASSOCIATES, INC. <br /> <br /> <br /> <br /> <br />Joe Brusca <br />Principal Engineering Geologist <br />Certified Engineering Geologist No. 1948 <br />