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22 November 2023 AdvancedGeo Project No. 23-7523 An Employee Owned Company Page 5of7 3.1. ANALYTICAL RESULTS OF SOIL SAMPLES • The soil profile generally consisted of dry sandy silt or silty sand mixtures from near surface grade to 15 feet bsg. • Organic vapors were not detected with the PID during the investigation. • There were no VOC constituents detected above laboratory reporting limits in any of the soil samples (Table 1). 3.2. ANALYTICAL RESULTS OF SOIL-VAPOR SAMPLES • Tetrachloroethene (PCE) was detected in all twenty of the sampled soil-vapor and sub-slab sampling locations at concentrations ranging between 320 micrograms per cubic meter (pg/m3; V6-A)and 7,000 pg/m3 (V2-A). • Trichloroethene (TCE) was detected in eight of the twenty samples at concentrations ranging between 8.8 pg/m3(SS-7) and 340 pg/m3(V6-C). • Cis-1,2-dicholoroethene (cis-1,2-DCE) was detected in two of the twenty samples at concentrations of 30 pg/m3(V6-C) and 37 pg/m3(V2-A). • Benzene was detected in five of the twenty samples at a maximum concentration of 26 pg/m3(W-A). • Helium was detected in one of the twenty samples at a concentration of 0.13 pg/m3 (SS-7). • Several additional VOCs, including acetone, 4-methyl-2-pentanone, freon 113, 1,3-betadiene, ethanol, carbon disulfide, hexane, methyl ethyl ketone, tetrahydrofuran, chloroform, cyclohexane, 2,2,4-trimethypentane, toluene, ethylbenzene, 4-ethytolune were detected in one or more of the soil-vapor samples collected (Appendix B). Soil-vapor analytical results are summarized in Table 2. 4.0. SUMMARY AND CONCLUSIONS Based upon the environmental activities completed, AGI concludes the following: • Constituents of concern were not detected in any of the soil samples collected during the October/November 2023 investigation. Based on all data collected the site generally appears to be impacted primarily by chlorinated hydrocarbons in the soil-vapor phase only. • The site Iithology is generally homogeneously composed of silty sand and sandy silt mixtures from near surface grade to 35 feet bsg.