ARCHIVED REPORTS XR0008704 - Laserfiche WebLink

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ANTICIPATED NEXT QUARTER ACTIVITIES • Submit Quarterly Summary Report • Conduct quarterly monitoring event • Submit Additional Assessment Report for installation of three additional deep groundwater monitoring wells CHARACTERIZATION/REMEDIAL STATUS Impacted soil delineated9 Yes-lateral, Yes-vertical Impacted groundwater delineated9 Unknown Current phase of project? Assessment and Monitoring Frequency of sampling9 Quarterly Current Remediation Techniques9 NIA Soil remediation in progress9 No Anticipated start9 NIA Anticipated completion9 NIA Shallows Zone groundwater gradient? 0 003 ft/ft Northwest Deep Zone groundwater gradient? 0 045 ft/ft Northwest and 0 136 ft/ft Northeast Dissolved/free product remediation in progress9 No Anticipated start? N/A Anticipated completion? N/A CONCLUSIONS Soil impacts extend vertically from the base of the dispenser area over-excavation to approximately 70 feet bgs, petroleum hydrocarbon concentrations attenuate at 80 feet bgs Shallow groundwater impacts at the water table are limited to methyl tert-butyl ether(MTBE)at concentrations of 12 and 9 micrograms per liter(pg/1)in MW-3 and MW-4, respectively Deep groundwater(80 feet bgs)is impacted by TPH as gasoline(TPHG)and benzene,toluene, ethylbenzene, and xylenes(BTEX) TPHG was reported in MW-5, MW-6, MW-8, MW-9, and MW-10 at 8,100 pg/l,2,300 µg/l, 2,300 µg/l,22,000 gg/l, and 9,200 pg/l,respectively Benzene was reported in MW-6, MW-8, and MW-9 at 130 pg/l, 600 pg/l, and 490 ltg/I,respectively MTBE was not reported in the deep groundwater wells The extent of the deep impacts is not defined The owner of adjoining property to the east and north of the subject site is exploring a purchase of the subject site with probable use as parking i SAC 1N 1sacDP120021PW1PJ81821822121 2a doc-021rt l IT CORPORA TION