SEDIMENTARY BEDROCK Sample Clauses

SEDIMENTARY BEDROCK. Sedimentary bedrock was encountered at BH-4, at a depth of 20.12 meters below existing grade, at an elevation of approximately 29.31 meters. Bedrock was confirmed by rock coring. Rock core samples indicate the bedrock is predominantly medium grained sandstone. The RQD (Rock Quality Designation) of the bedrock averaged 72 percent and ranged from 71 to 73, indicating a fair quality. The bedrock ranged from reddish brown to whitish red in color. The sandstone rock mass was predominantly medium grained, slightly weathered, with extremely weak to medium strong strength. Discontinuities were extremely close to widely spaced and predominantly horizontal and parallel to bedding. The results of point load tests carried out on selected bedrock core samples are presented on Table 6, appended. The point load index (Is) was determined from both diametral and axial tests. The unconfined compressive strength (Qu) was estimated from the point load data using the relationship Qu = 24 x Is. The point load test data indicate that the core samples tested fall within the weak (5 to 25 MPa) to medium strong (25 to 50 MPa) strength classifications as per the aforementioned Symbols and Terms used on Borehole and Test Pit Records. It should be noted that the weakest rock is often not recovered during coring operations and that intact core samples are required for testing. Consequently, an extremely weak to medium strong classification would be more representative of the overall rock mass at the site and is predominantly used on the Borehole Records.
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SEDIMENTARY BEDROCK. Sedimentary bedrock was encountered at BH-1 and BH-4, at depths ranging from 12.47 to 12.88 meters below existing grade. The bedrock elevation ranged from approximately 8.5 to 9.1 meters. Bedrock was confirmed by rock coring. Rock core samples indicate the bedrock is predominantly medium grained sandstone. The RQD (Rock Quality Designation) of the bedrock averaged 28 percent and ranged from 0 to 85, indicating a very poor to good quality. The bedrock ranged from reddish brown to whitish red in color. The sandstone rock mass was predominantly fine to medium grained, slightly weathered, with extremely weak to strong strength. Discontinuities were extremely close to closely spaced and predominantly horizontal and parallel to bedding.
Sample 1

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