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• March 2000 -24- 993-2099.150 <br />Golder personnel performed additional field investigations in the Phase IV area under two <br />field programs performed in April and May of 1998. The first part of the field program <br />consisted of a test pit excavation, in which twenty-seven test pits were excavated from <br />April 21 through April 27, 1998. The second part of the field program consisted of <br />drilling fourteen boreholes (twelve Becker hammer boreholes and three companion sample <br />holes) from April 24 through May 3, 1998. Test pits were excavated by Conley using a <br />Case 9040 trackhoe, and boreholes were drilled by Layne-Western Drilling. Golder <br />supervised and logged each test pit, supervised each borehole, and collected samples for <br />subsequent laboratory testing where appropriate. The results of the laboratory test data are <br />presented in Appendix B-1. <br />The logs of the test pits and boreholes from the Phase IV investigations are presented in <br />Appendix A. The locations of the test pits and boreholes are shown on Drawing No. 2. <br />3.3 Site Geotechnical Conditions <br />Three test pits (GA98-11, GA98-12, and GA98-13) were excavated in February of 1998 in <br />the area of the Phase IV footprint, to the east of the existing Phase I VLF. These test pits <br />were excavated to depths ranging from approximately 3 feet to 18 feet. The soils <br />encountered in the test pits consisted of one foot of growth medium, which was underlain <br />by highly weathered bedrock at a depth of 1 to 8 feet. The soils above the weathered <br />bedrock generally consisted of silty sands which classify as an SM under the Unified Soil <br />Classification System (USCS). Ground water was not encountered in any of the test pits. <br />Twenty seven test pits (TP98-1, TP98-2, TP98-3, TP98-4, TP98-5, TP98-7, TP98-9, <br />TP98-10, TP98-11, TP98-12, TP98-13, TP98-14, TP98-15, TP98-16, TP98-17, TP98-18, <br />TP98-19, TP98-20, TP98-21, TP98-22, TP98-23, TP98-24, TP98-25, TP98-26, TP98-27, <br />• TP98-28 and TP98-29) were excavated from April 21 through April 27, 1998 in the <br />general area of the Phase IV footprint. The test pit logs are presented in Appendix A-1. <br />I:\93\309TFINAL REPORT20-9MAINl.DOC Golder Associates <br />