Common use of DRILLING AND SAMPLING METHODS Clause in Contracts

DRILLING AND SAMPLING METHODS. 3.3.1 Unless otherwise specified or approved by the Owner, drilling and sampling shall be performed in accordance with the applicable ASTM standards, current at the time of Agreement signing, including, but not limited to, ASTM D1586, D1587 and D2113. Soil samples shall be taken at the ground surface, at two feet below existing grade, and at each change in soil stratification or soil consistency, but not further apart than five feet in each of the borings unless otherwise specified on the boring plot plan(s). Where clay cohesive soils are encoun­tered, thin‑walled tube samples shall be taken of repre­sentative strata. Split‑spoon samples shall be placed in sealed jars labeled with the following information: (1) boring number, (2) sample number, (3) sample depth, (4) blows per foot required to drive sample, (5) date, (6) Project name, and (7) Consultant's name. 3.3.2 Rock cores shall be not less than 1 3/8" in diameter, and shall be placed in core boxes properly labeled as indicated in 3. 3.1. Cores shall be advanced to the depth specified in Exhibit A. 3.3.3 The samples shall be preserved and remain subject to inspection for a period of six (6) months as specified by the Owner. Field logs shall be prepared either by the Consultant or by an experienced Geotechnical Technician acting under the direct supervision of the Consultant.