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KASA PROPERTY AdvancedGeo 11 December 2020 An Employee-Owned Company Page 2 of 2 -� • Dissolved Petroleum Hydrocarbon COC: 528 feet (1/10-mile) in the up- gradient position; 95 feet in the equi-gradient position, and 30 feet in the down-gradient position. • Free Product(LNAPL)COC: 528 feet(1/10-mile) in the up-gradient position, 165 feet in the equi-gradient position, and 100 feet in the down-gradient position. Are sites located within the AOC? X No Tier 1 screening is complete, and no VEC currently exists, proceed to CONCLUSIONS Yes Proceed to (2) (2) Subsurface Characteristics (2a) Is there a hydraulic (e.g., a river) or physical barrier (e.g., clay barrier) between the SP and the suspected contaminated site (or sites)? Not Applicable (2b) Are non-petroleum hydrocarbon COC and dissolved petroleum hydrocarbon or free product (LNAPL) COC known to be in the groundwater beneath the subject property. Not Applicable TIER 2 SCREENING If the Tier 1 screening indicates that a VEC exists, the Tier 2 non-invasive screening can be used to refine screening. Tier 2 applies numeric screening criteria to existing or newly collected soil, soil gas and/or groundwater monitoring results to provide greater certainty to whether or not a VEC exists. The Tier 2 screening involve a Plume Test and Critical Distance Determination. The Critical Distance Determination requires that the edge of the plume be known. The Critical Distance is the lineal distance in any direction between the nearest edge of the contaminated plume and the nearest SP boundary. A Tier 2 Screening was not warranted for the subject property. CONCLUSIONS (1) Conclusions: Impact on Subject Property A VEC exists X A VEC does not exist Buonicore, A.J., 2011, Methodology for Identifying the Area of Concern Around a Property Potentially Impacted by Vapor Migration from Nearby Contaminated Sources, Paper#2011-A-301-AWMA.