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Brusca File No. 137-002 <br /> <br />Page 4 <br />June 25, 2019 <br />Murphy Parkway Property Soil Gas Monitoring <br /> <br />certainly is excessively conservative considering that the floor slab for the onsite warehouse <br />building is seven inches thick and is underlain by a 12-inch section of cement treated subgrade. <br />Given the forgoing, it would not appear that the June 2019 soil gas data indicate conditions of <br />concern at the site. <br /> <br /> <br />SUMMARY AND CLOSING <br /> <br />As described herein, our firm conducted monitoring/sampling of the t wo soil gas monitoring <br />wells (SGMW1 and SGMW2) at the subject property in June 2019. The purpose of the soil gas <br />monitoring program is to evaluate whether soil gas contaminants, including methane and VOCs, <br />exist at the westerly margin of the pro perty a s a result of uncharacterized subsurface wastes that <br />reportedly exist offsite to the west of the subject property. Data from the June 2019 monitoring <br />event do not indicate concentratio ns of me thane or VOCs in soil gas at the monitoring well <br />lo cations that are considered a concern. The next monitoring event will take place in the third <br />quarter of 2019. <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 Geolo gist <br />Certified Engineering Geologist No. 1948 <br /> <br /> <br />Attachments: Plate 1, Vicinity Map <br />Plate 2, Site Map <br />Plate 3, Detail Map <br /> Table I, Summary of Field Screening and Laboratory Analytical Data <br /> Laboratory Reports and Chain-of-Custody Documentation <br /> <br /> <br />JB:jb