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.~1 <br />Orange County Trigon Project No. 036-OD-016D <br />Hillsborough Landfill Site 7uly 19, 2000 <br />3..3 GROUNDWAT);R CONDITIONS <br />Groundwater was encountered in 17 of the 49 borings across the site at depths ranging from 1 0 <br />feet to 6.5 feet where encountered. It should be noted that fluctuations irr groundwater levels can <br />occur due to seasonal changes in precipitation and surface water runoff. Seasonally high <br />groundwater levels usually occur during or ,just after the typically wetter months of the year <br />(November through April). _ <br />4.0 CONCLUSIONS AND RECOMMENDATIONS <br />4.1 Basis <br />Based on a review of the boring logs, the most significant deposits of refuse, rubble and debris <br />appeazs to be generally toward the center of the site, and to the north and south of the existing <br />creek. Trash and debris was encountered in 10 of the borings as noted on the Soil Boling <br />Summary table in Section 32, Subsurface Conditions, and the boring logs and profiles provided <br />in Appendix G <br />The existence of FILL soils in borings between those that encountered trash and debris indicate <br />that landfilling practices were random and widespread. This is consistent with information on <br />landfilling operations described by personnel who worked at the landfill (see Trigon's Report of <br />Phnse I Environmental Site Arsessmertt). Please refer to the maps, Boring Logs and Subsurface <br />Profiles provided in the appendices of this report for more specific information. <br />4.2 Design and Construction Considerations <br />The development options for'the project site aze limited due to 1) the variable depths of existing <br />FILL material throughout much of the site, and 2) the presence of refuse and rubble debris found <br />in a number of the soil borings. The following is a highlight of the most significant design and <br />constmction considerations for development of the silo, The conclusions and recommendations <br />provide general design and construction considerations for excavation and grading, stmcture <br />loading, and pavement and athletic facility improvements. As more specific uses aze being <br />TRIGONENGlNEL1UNGCONSULTiiNTS, INC Page 5 <br />