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(a) Test pits may be substituted for boring on a one-for-one basis. All applicable requirements as to depth, numbers of samples, data to be reported, and disposition of samples shall be observed, except that the use of sample spoon, recording of driving resistance, and recovery of rock cores is not required in test pit investigations, and except as provided in subdivision (b) of this section.

(b) Test pits for buildings not more than one story in height or for one or two-family residences not more than two stories in height need only extend four feet below the deepest part of the excavation for the construction of footings, or a minimum of four feet when foundation elements rest on grade pursuant to paragraph four of subdivision (a) of section 27-658 of article one of this subchapter, provided that such structures are supported by footings bearing on nominally satisfactory bearing materials of class 9-65 (except soft clay) soil or better.

Related Code Sections

§27-664 Foundations, Test Pits
(a) Test pits may be substituted for boring on a one-for-one basis. All applicable requirements as to depth, numbers of samples, data to be reported ...
§27-720 Foundations, Boring and Test Pit Operations
Boring and test pit operations shall be subject to controlled inspection, except that fifty per cent or less of the required number of borings ...