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' eala ccaI Teckiucs 14C Page 6 G g g Valentme(Castle Motors) ' Report—Additional Site Characterization Project No 723 2 January 21,2004 detntus were occasionally present Some sand layers contained pebbles up to 20 mm in length ❑ Fine gram units- silts and clays were found at depths of approximately 20— 35, 50 — 63, 78 — 87 and at the boring terminus at 91 — 95 feet bgs o The silts and clays ranged from brown, red-brown to olive-grey in color with prominent CaCO3 inclusions at depths of 52 - 57 & 79—80 feet bgs ❑ Groundwater was encountered at approximately 36 5 feet bgs Soil samples obtained below this depth were either moist or wet ❑ No field evidence of contamination (odor or staining) was noted in this boring ' OVM readings were not obtained due to an equipment calibration problem In the location of CMTTM well MW-8, the subsurface was charactenzed as follows ❑ The subsurface contained alternating layers of sands, silts and clays This boring ' was sampled at 5 foot intervals and exhibits less detail than MW-7 ❑ Sand intervals occur at 0— 25, 35, 50, 70 - 85 feet bgs ❑ The sands ranged from very fine to very coarse grain size and brown, grey, and olive-grey in color CaCO3 inclusions, iron oxide staining and black organic detntus were occasionally present CaCO3 inclusions were prominent in the sands at 10 feet bgs ' ❑ Fine grain units- silts and clays were found at depths of approximately 30, 40 — 45, 55 - 65 and at the boring terminus at 90—95 feet bgs ❑ The silts and clays ranged from brown to olive grey in color with prominent CaCO3 inclusions at depths of 45 & 55 feet bgs ❑ Groundwater was encountered at approximately 36 feet bgs Soil samples obtained below this depth were either moist or wet ❑ Field evidence of contamination (odor, staining or OVM readings) was noted in this boring Petroleum hydrocarbon odor was noticeable at levels from 20— 45 and 60— 75 feet bgs The highest OVM readings of 447 and 532 ppm corresponded with strong gasoline odors at 25 and 30 feet, respectively At 70 feet bgs, the OVM registered 54 ppm and the field geologist described the soil odor as "strong- weathered gasoline" In the location of borehole MW-9 the subsurface was characterized as follows ' ❑ As with the MW-7 and MW-8 locations the subsurface contained alternating layers of sands, silts and clays ❑ Sand intervals occur at 15, 25, 45, 60— 85, and at the boring terminus at 95 feet bgs ❑ The sands ranged from very fine to very coarse grain size and brown, grey, and olive-grey in color CaCO3 inclusions, iron oxide staining and black organic detntus were occasionally present CaCO3 inclusions were prominent in the clayey sands at 15 feet bgs with a cemented I/z" caliche layer ❑ Fine grain units- silts and clays were found at depths of approximately 0— 10, 20, 30 —40, 50—55, and 90 feet bgs ❑ The silts and clays ranged from brown to olive-grey in color with prominent CaCO3 ' inclusions at depths of 40 and 90 feet bgs o Groundwater was encountered at approximately 36 feet bgs Soil samples obtained below this depth were either moist or wet ❑ No field evidence of contamination (odor, staining or OVM readings) was noted in this boring