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SANCHEZ PROPERTY <br />29 January 2021 <br />Page 2 of 3 <br />AdvancedGeo <br />An Employee -Owned Company <br />(1b) 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 />• Dissolved Petroleum Hydrocarbon COC: 528 feet (1/10 -mile) in the up - <br />gradient position; 95 feet in the equi-gradient position, and 30 feet in the <br />down -gradient position. <br />• Free Product (LNAPL) COC: 528 feet (1/10 -mile) in the up -gradient position, <br />165 feet in the equi-gradient position, and 100 feet in the down -gradient <br />position. <br />Are sites located within the AOC? <br />X No Tier 1 screening is complete, and no VEC currently exists, proceed to <br />CONCLUSIONS <br />Yes Proceed to (2) <br />(2) Subsurface Characteristics <br />(2a) Is there a hydraulic (e.g., a river) or physical barrier (e.g., clay barrier) between <br />the SP and the suspected contaminated site (or sites)? Not Applicable <br />(2b) Are non -petroleum hydrocarbon COC and dissolved petroleum <br />hydrocarbon or free product (LNAPL) COC known to be in the groundwater <br />beneath the subject property. Not Applicable <br />