ARCHIVED REPORTS XR0011655 - Laserfiche WebLink

Home Browse Search

i I N F F L D F R • These soils were underlain by highly interbedded strata of very-stiff clay veru-stiff silt and loose to medium-dense silty clayey, and relatively cclean ' sand to the depths explored In boring 3-1 fill sails were encountered to a depth of about 4 feet The test bon-rigs were checked for the presence of groundwater dunng and inuneaiately following dialling operations Groundwater was encountered in each boring and ranged from about 6 7 to about 12 3 feet below the existing site grade It should be noted that groundwater elevations and soil moisture conditions within the project area will vary depending on seasonal rainfall, imgation practices, land use and/or runoff conditions not apparent at the time of our field investigation The evaluation of such factors is beyond the scope of this investigation Detailed descriptions of the subsurface conditions encountered during our field investigation are presented on the Logs of Borings, Plates A-3 through A-8 of the appendix A summary of laboratory tests is presented on Plate A-9 of the appendix 5 CONCLUSIONS AND RECOMMENDATIONS 5.1 General Based on our findings, it is our professional opinion that the site should be suitable from a geotechnical standpoint for construction of the proposed sewer trunk provided the . recommendations contained herein are incorporated into the project design The primary geotechnical considerations from a development standpoint are construction dewatering and the stability of the trench sidewalls during installation and backfilling Specific conclusions and recommendations addressing these geotechnical considerations, as well as general recommendations regarding the geotechnical aspects of design and construction are presented in the following sections 52 Trench Excavations Gen e7 al Based on previous experience it is our professional opinion that the subsurface soils within the project area can be readily excavated using conventional earth moving equipment It should be understood, however, that this report does not represent a study of the excavatability of the subsurface materials that may be encountered within the limits of the proposed project The contractor should independently evaluate the condition of the subsurface materials in oraer to select the appropriate excavation equipment and techniques Furthermore the contractor shoulcl be aware of past development and activities within the project area and that abandoned utility lines, septic tanks cesspools, wells ana/or founciations may be encountered within the proposed pipeline aligminents Excavation and removal of these features if encountered will require special consideration by the contractor 13629 GQ11?002RA9 -%pnl 19 2002 ?002 Klemelder inc pace s of 16