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DBrusea <br />Associates, Inc. <br />Environmental Engineering Geology <br />December 27, 2018 <br />Buzz Oates Development and Construction Services <br />Attention: Cybil Bryant <br />555 Capitol Mall, Ninth Floor <br />Sacramento, CA 95814 <br />DECEMBER 2018 SOD. GAS MONITORING <br />MURPHY PARKWAY PROPERTY <br />APN 198-120-009 <br />17100 Murphy Parkway <br />Lathrop, California <br />Brasca Project No. 137-002 <br />INTRODUCTION <br />In accordance with your request, we performed monitoring/sampling of the two soil gas <br />monitoring wells (SGMWI and SGMW2) at the subject property in December 2018. <br />Implementation of a soil gas monitoring program has been required by regulatory agencies <br />overseeing environmental conditions at the site. Specifically, the soil gas monitoring program <br />has been required to evaluate whether soil gas contaminants, including methane and volatile <br />organic compounds (VOCs), exist at the westerly margin of the property as a result of <br />uncharacterized subsurface wastes that reportedly exist offsite to the west of the subject property. <br />A Vicinity Map showing the location of the subject property is presented as Plate 1. Plate 2 is a <br />Site Map showing the layout of the property, a light-industrial/warehouse building currently <br />under construction at the site, and the locations of the two onsite soil gas monitoring wells. A <br />detail drawing of the far westerly portion of the property showing the locations of the soil gas <br />monitoring wells and the layout of planned pavements in this area is presented as Plate 3. Soil <br />gas field screening data and analytical laboratory results are summarized on the attached Table I. <br />The laboratory reports and chain -of -custody documentation also are attached. <br />BrawaAssociates.com a P.O. Box 332, Roseville, CA 95661 a Phone (916) 677-1470 <br />