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� � � l I PROCEDURES REGARDING FIELD LOGS 1 LABORATORY DATA SHEETS -AND SAMPLES ) In the process of obtaining and testing samples and preparing this report, I procedures are followed that represent reasonable d a n accepted practice in the field of soil and foundation engineering. 1 Specifically, field logs are prepared during performance of the drilling and sampling operations which are intended to portray essentially field occur- rences, sampling locations and other information. Samples in obtained the field are frequently subjected to additional testing and reclassification in the laboratory by more experienced soil engineers, and differences between the field logs final and the logs exist. The engineer preparing the report reviews the field and laboratory logs, classifications and test data, and in his judgement in interpreting this data, may make further changes. Samples taken in the field, some of which are later subjected to laboratory tests, are retained in our laboratory for sixty days and are then destroyed unless special disposition is requested by our client. Sam ples ined over a long period of time, even in sealed jars, are subject to moisture aloss which changes the apparent strength of cohesive soil, generally increasing the strength from what was originally encountered in the field. Since they are no longer representative of the moisture conditions initially encountered, an inspection I• of these samples should recognize this factor. It t s' commo n practice to the soil and foundation engineering profession that field logs and laboratory data sheets not be included in engineering reports, because they do not represent the engineer's final opinions as to appropriate descriptions for conditions encountered in the exploration and testing work. On the other hand, we are aware that perhaps certain contractors and sub- contractors submitting bids or proposals on work might have an interest in studying these documents before submitting a bid or proposal. For this reason, the field logs will be retained in our office for inspection by all contractors submitting a bid or proposal. We would welcome the opportunity to explain any changes that have and typically Tn i are made the preparation of our final reports, to the contractor or subcontractors, before the firm submits its bid or proposal, and to describe how the information was obtained to the extent the contractor or subcontractor wishes. Results of laboratory j tests are generally shown 9 y o n on the boring logs or are described in the text of the report, as appropriate. The descriptive terms and symbols used on the logs are described on the attached sheet, entitled General Notes. 7 STS Consultants, Ltd. f