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AdvancedGeo <br />An Employee-Owned Company <br />Joil <br />....�. <br />VAPOR ENCROACHMENT SCREENING (ASTM E2600-15) <br />KASA PROPERTY <br />3009 POCK LANE, STOCKTON, CALIFORNIA <br />11 December 2020 <br />In accordance with ASTM Standard E2600-15 and the Buonicore Area of Concern <br />determination (2011)1, AdvancedGeo, Inc. performed the initial Tier 1 Vapor <br />Encroachment Screening which includes determining the presence or likely presence of <br />volatile organic compounds (VOCs) vapors in the sub -surface of the subject property (SP) <br />caused by the release of vapors from contaminated soil or groundwater either on or near <br />the Target Property within an Area of Concern (AOC) to determine if a potential Vapor <br />Encroachment Condition (VEC) exists. Should sites fall within the AOC, a limited Tier 2 <br />screening will be performed. <br />TIER 1 SCREENING <br />(1) Ground Water Flow Direction: Is the groundwater flow direction known? <br />No I Proceed to (1a) <br />X Yes I Proceed to (1 b) <br />Identify the groundwater flow direction here: East <br />(1a) If groundwater flow direction is unknown, the AOC is: <br />• Non -Petroleum Hydrocarbon Contaminants of Concern (COC): 1,760 feet <br />(1/3 -mile) from the contaminated site boundary to the boundary of the SP. <br />• Dissolved Petroleum Hydrocarbon COC: 528 feet (1/10 -mile) for from the <br />contaminated site boundary to the boundary of the SP. <br />• Free Product (Light non -aqueous phase liquids [LNAPLI) COC: 528 feet <br />(1/10 -mile) for from the contaminated site boundary to the boundary of the <br />SP. <br />Are sites located within the AOC? Not Applicable <br />(1 b) If groundwater flow direction is known, the AOC for non -petroleum hydrocarbon <br />COC and dissolved petroleum hydrocarbon or free product (LNAPL) COC is: <br />• Non -Petroleum Hydrocarbon COC: 1,760 feet (1/3 -mile) in the up -gradient <br />position, 365 feet in the equi-gradient position, and 100 feet in the down - <br />gradient position. <br />Nationwide Capabilities <br />Telephone (800) 51 1-9300 • Fax (888) 445-8786 <br />