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G¢ologccal T¢ck�cccs lac Page 7 <br /> Morita <br /> Additional Site Characterization Report <br /> Project No 724 2 <br /> April 19,2004 <br /> ❑ The silts and clays ranged from brown to olive-grey in color with some CaCO3 <br /> nodules <br /> ' ❑ Groundwater was encountered at approximately 38 feet bgs <br /> ❑ Field evidence of contamination (sewage odor) was noted in two samples from this <br /> boring beneath the water table OVM readings from samples below the water table <br /> ranged 0 2 —0 4 ppm above the background level of 0 ppm <br /> ' Wells MW-1081208 <br /> Intermediate and deep well pair MW-108/208 was installed approximately 60 feet northeast <br /> ' of the site This is a down gradient position and the subsurface in this location is <br /> characterized as follows <br /> ❑ The subsurface contained alternating layers of sands, silts and clays <br /> ' ❑ Shallow samples contained both live roots and root tubes <br /> ❑ Sand intervals occur at 10—25, 45 —50 and 70 feet bgs <br /> ❑ The sands ranged from very fine to medium in grain size and brown to grey or black <br /> in color CaCO3 nodules and black organic detritus or magnetite were occasionally <br /> ' present <br /> ❑ Fine grain units- silts and clays were found at depths of approximately 0 -- 5, 30 — <br /> 40, 55 —65 and 70— 75 feet bgs <br /> t ❑ The silts and clays ranged from brown, grey, and green to blue-grey in color with <br /> some CaCO3 nodules and black organic detritus or magnetite <br /> ❑ Groundwater was encountered at approximately 38 feet bgs <br /> ❑ Field evidence of contamination (sewage odor) was noted in samples from this <br /> boring beneath the water table at 50 feet bgs and lower OVM readings from <br /> samples below the water table ranged 0 2 --- 1 3 ppm above the background level of 0 <br /> PPM <br /> ' Wells MW-109/209 <br /> Intermediate and deep well pair MW-1091209 was installed approximately 75 feet east of <br /> ' the site This is a down gradient position and the subsurface in this location is characterized <br /> as follows <br /> ❑ The subsurface contained alternating layers of sands, silts and clays <br /> ❑ Sand intervals occur at 0 — 10, 20 - 25, 50, 60 and 70 feet bgs <br /> ' ❑ The sands ranged from very fine to coarse in grain size and light brown to blue-grey <br /> or grey in color CaCO3 nodules and black organic detritus or magnetite were <br /> occasionally present <br /> ' ❑ Fine grain units- silts and clays were found at depths of approximately 15, 25 - 45, <br /> 55, 60—65 and 75 feet bgs <br /> ❑ The silts and clays ranged from light brown, light grey to blue/green-grey in color <br /> with some CaCO3 nodules and black organic detritus or magnetite At 3 5 feet bgs a <br /> ' prominent 1/" thick white clay layer was present between grey clays above and <br /> brown silty clays below <br /> ❑ Groundwater was encountered at approximately 38 feet bgs <br /> ' ❑ Field evidence of contamination was noted in samples from this boring beneath the <br /> water table OVM readings from samples at 55, 65 and 75 feet ranges 0 2 -0 7 ppm <br /> above the background level of 0 ppm The field geologist noted the presence of <br /> ' faint odors in the bottom two samples <br />