FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Report-Soil and Groundwater Investigation Herman&Helen's Marina September 26, 1995 ' Page-3- The hydropunch boreholes were drilled using 6-inch diameter, hollow stem auger. The augers and bit were steam cleaned prior to use. Two (2) of the hydropunch boreholes (HP-1 and ' HP-2) were located on the levee and were drilled to depths of approximately 16 and 11 feet below the top of the levee (btl), respectively. The third hydropunch borehole (HP-3) was located below the ' levee and was drilled to a depth of approximately 6 feet below the ground surface (bgs). At each borehole, the Hydropunch II sampling screen was hydraulically pushed approximately 4 feet beyond ' the bottom of the borehole (i.e., HP-1 to 20 ft btl, HP-2 to 15 ft btl, and HP-3 to 10 ft bgs). No artesian flow was encountered during the drilling. ' 3.3 Soil Sampling Soil samples were collected at five (5) foot intervals using a California-modified, split-spoon sampler fitted with three clean, brass liners. The soil sampling equipment (i.e., split-spoon) was cleaned prior to collecting each sample. The cleaning procedures consisted of washing the sampling ' spoon in a solution of laboratory-grade, non-phosphate detergent and hydrocarbon-free water, and double-rinsing with hydrocarbon-free water. During the sampling, the split-spoon sampler was driven approximately 1.5 feet ahead of the ' auger. The uppermost liner was discarded. One sample liner was used for geological logging and for field screening using an organic vapor analyzer (OVA-FID) and the bottommost liner was prepared, ' as described below, for shipment to the laboratory. The soil samples were logged according to the Unified Soil Classification System. Geological logs were prepared and contain field observations ' including soil type, estimated moisture content, presence of staining or odor, and field FID measurements (Appendix B, Geological Logs). ' The soil types encountered while drilling on the levee (HP-1 and HP-2) consisted of gravelly tsilt and sand at the 5 foot depth and clayey, fine-sand at 10 feet btl. HP-1 was drilled to a depth of 16 feet btl where layered clay and peat were noted. Groundwater was encountered in HP-1 at 16 feet ' btl and stabilized at 11 feet btl. In 14P-2, groundwater was encountered at 13 feet btl and remained at that level. The soil type encountered at HP-3 consisted of 100% organics (compacted peat) at 5 feet ' bgs. Groundwater was encountered and stabilized at approximately 6 feet bgs. ' i• CONDOR