Laserfiche WebLink
GE � <br /> GENESIS ENGINEERING 8 REDEVELOPMENT <br /> 3. Developing and administering contracts for the drilling subcontractor, <br /> analytical laboratory, and subsurface locator; <br /> 4. Preparing a site-specific Health and Safety Plan; and <br /> 5. Maintaining contact with county agencies and property owners as to drilling <br /> schedules and other work activities. <br /> 3.2 Drilling,Logging, and Sampling Techniques <br /> All drilling activities will conform to state and local regulations and will be coordinated by a <br /> California Professional Geologist. <br /> 3.2.1 Direct Push Technology <br /> Direct push drilling technology will be used to advance the reconnaissance borings. Direct <br /> push boring allows for the collection of samples with less waste and in a short period of time. <br /> The direct push drilling process consists of a truck mounted or limited access hydraulic <br /> system used to push a 4-foot long, 2-inch diameter hollow rod into the subsurface. A 1.75- <br /> inch diameter vinyl acetate plastic sample sleeve is inserted into the rod to collect continuous <br /> 4-foot long soil samples. The soils brought to the surface in the sample sleeves will be <br /> continuously logged to the maximum depth of the hole. <br /> Groundwater samples will be collected utilizing a direct push screen driven into the <br /> undisturbed soils ahead of the borehole. At the selected depth interval, the drill rod will be <br /> retracted, exposing the well screen. Water will be allowed to enter the well screen. A <br /> groundwater sample will be collected using a disposable bailer and decanted into the <br /> laboratory supplied sample bottles. <br /> Soil cuttings will be placed in 55-gallon drums, labeled, and moved to a common drum <br /> staging area. Soil cuttings will be disposed of in accordance with the procedure in Section <br /> 3.3. <br /> All direct push boreholes will be abandoned according to state and county guidelines. <br /> Completed boreholes will be grouted from the bottom up using a tremie pipe with a high- <br /> solids bentonite grout or bentonite Hole Plug®. The borehole will be backfilled to within 1- <br /> foot of the ground surface. Based on the existing surface material, a concrete,asphalt, or soil <br /> plug will be installed at the surface of each boring location. <br /> Lima Ranch 7 of 17 <br /> Site Characterization Work Plan Addendum <br /> April 2008 <br />