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I .~ AET #93-1379 - Page 14 each individual boring log. No surface elevations were obtained, although all borings were I placed directly on the road surface. I Field Sampling/Testing Methods The field sampling methods for the borings are described in the included data sheet under the I subheading "Standard Penetration/Split Spoon Sampling". I:: - , II Classification Methods Soil identifications and descriptions shown on the boring logs are judgments based on I ASTM:D2488-90 (Visual-Manual Procedure). Charts taken from ASTM:D2488-90 are shown on the appended sheet entitled "Identification of Soils. " Where sieve analysis tests have been I performed, classification is based on ASTM:D2487-92. The logs also indicate the apparent II geologic depositional origin, which is interpretive. I Sample Storage We will retain representative samples of the soils recovered from the borings for a period of 30 I days. The samples will then be discarded unless you notify us otherwise. I EXPLORATION PROGRAM LIMITATIONS I The data derived through this sampling and observation program have been used to develop our opinions about the subsurface conditions at your site. However, because no exploration program can reveal totally what is in the subsurface, conditions between borings and between samples and at other times, may differ I from conditions described in this report. The exploration we conducted identified subsurface conditions only at those points where we took samples or observed ground water conditions. Depending on the sampling methods and sampling frequency, every soil layer may not be observed, and some materials or I layers which are present in the ground may not be noted on the boring logs. Unless actually observed in a sample, contacts between soil layers are estimated based on the spacing of samples and the action of drilling tools. Thus, most contacts shown on the logs are approximate, with a I possible upper and lower limits of contacts defined by the overlying and underlying samples. {' Cobbles, boulders, and other large objects generally cannot be recovered from test borings, and they may be present in the ground even if they are not noted on the boring logs. I