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Mr. Sam Roberto <br />Project BBXX- 01 -119A <br />May 24, 2001 <br />Page 11 <br />E. Procedures <br />E.1. Exploratory Borings <br />The penetration test borings were drilled with a truck - mounted core and auger drill equipped <br />with hollow-stern auger. The borings were performed in accordance with ASTM Test Method D <br />1586. Penetration test samples were taken at 2 1/2- or 5 -foot intervals. Actual sample intervals <br />and corresponding depths are shown on the boring logs. <br />E.2. Materials Classification and Testing <br />Materials encountered in the borings were visually and manually classified in accordance with <br />ASTM Test Method D 2488. A chart explaining the classification system is attached. Samples <br />were sealed in jars or bags and returned to our facility for review and storage. We will hold the <br />project samples for 60 days. <br />E.3. Groundwater Measurements <br />The drillers checked for groundwater as the borings were advanced, and again after auger <br />withdrawal. The boreholes were then backfilled or allowed to remain open for an extended <br />period of observation as noted on the boring logs. <br />F. Qualifications <br />F.1. Variations in Subsurface Conditions <br />F.1.a. Material Strata <br />Our evaluation, analyses and recommendations were developed from a limited amount of site <br />and subsurface information. It is not standard engineering practice to retrieve material samples <br />from borings continuously with depth, and therefore strata boundaries and thicknesses must be <br />inferred to some extent. Strata boundaries may also be gradual transitions, and can be expected <br />to vary in depth, elevation and thickness away from the boring locations. <br />