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h� K L E I N F E L D E R 0 DISCUSSION OF FINDINGS 6.1 EXCAVATION 013SCRVATIONS Approximately 5,000 cubic yards of soil and debris was excavated from Site B and about 10,000 cubic yards froth site C. Groundwater was encountered in both borings at about 6 to 9 feet bgs. Site B and C excavation had an estimated average depth of twelve feet and ten feet, respectively. An estimated I percent of debris material was excavated from Site B consisting of plastic, wood wire, concrete and railroad ties. Approximately 25 percent of the material at Site B was slaked lime and time material. Discolored soil and an organic odor was noted in the vicinity of the slaked time. A soil and two groundwater samples were collected in the vicinity of this material. An estimated 25 percent of material was estimated to be debris from Site C consisting of sheet metal. concrete. culvert piping". bricks. +vire. and wood. No soil discoloration or odor was noted from the soil or groundwater I*rom the excavation at Site C. T\.\'o soil samples were analyzed from within this excavation were collected at depths ranging from 9 to 12 feet bgs. 6.2 MONITORING \WELL AI3ANDONMENT OBSERVATIONS 1Cleinfelder obsen+ed the abandonment of three ofsix wells (MW-7. MW-9 and MW-11) used for monitoring groundwater irrihe vicinity cif the two disposal sites (B and Q. Monitoring wells MW- S, MW-10 and MW-12 were not ahlc to be located and were presumed destroyed during grading operations on site. Well abandonment was conducted by drilling out well casing and well materials Prom surface to the respective total depths of each of the three \yells and subsequently tremmie- grouted with a neat cement/hentomw slurry to surface grade in accordance with the approved PHS/CHD permit. 6.3 ANALYTICAL RESULT'S The analytical results of the Ih1'CC soil samples collected from the two excavation sites and submitted for analyses were I-CVI :wed cnul compared to the 1098 llnited States I-:nvironmental Protection Auency (CPA) Rcgion IX Preliminary Remediation Goals (ERGs) for soil for residential and Industrial sitcs. R,"idential PRGs were selected for comparison because they :ire the most conservative. I-lowcver- the site is zoned and proposed for industrial site use. PBGs are contaminant concentrations in environmental media (i.e. soil, air. water), calculated by the U.S. 20-3978-03.W.,61201 Y760 I'age IS o1'20 © 1999.Kleinkider.tic. Septenlher'). 1999