WORK PLANS - Laserfiche WebLink

Home Browse Search

14 September 2022 Advanced(~: Project No. 96-0235 An Employee-Owned Company Page 3of3 3.1. CPT ADVANCEMENT CPT soil borings will be advanced to a depth of 120 feet bsg or until refusal is encountered utilizing a 25- or 30-ton truck-mounted CPT drill rig equipped with 2-inch diameter hollow- stem rods. The CPT drill rig utilizes a hydraulic ram to advance the rods to the desired depth. At the proposed boring location, the first of the paired soil borings will advance a cone penetrometer to the desired depth. Soil parameters such as cone bearing, sleeve friction and pore water pressure will be measured as the cone penetrometer is advanced. 3.2. CPT GROUNDWATER SAMPLING At each location, paired soil borings will be advanced for groundwater sample collection. Grab groundwater samples will be collected using a Hydropunch sample tool that will be pushed into specified zones, then withdrawn approximately five to ten feet to expose an inlet screen. The interior of the sampling tool fills with water and a 1-inch outer diameter stainless steel bailer will be lowered and utilized to extract a groundwater sample. Following sample collection, samples will be transferred into four volatile organic analysis (VOAs) vials; all samples will be properly labeled and placed in a chilled container to be transported under chain of custody to an ELAP-certified laboratory for analysis of constituents listed in Section 2.2. 3.3. EQUIPMENT DECONTAMINATION All non-disposable sampling equipment will be triple rinsed in a solution of Alconox prior to advancement of each boring. Rinseate generated during drilling activities will be containerized in properly labeled Department of Transportation (DOT)-approved 55-gallon drums and stored on-site in an area lacking public access. Disposal alternatives will be evaluated at a later date based on laboratory results. 3.4. BORING ABANDONMENT Following borehole advancement, Portland cement (grout mix) will be utilized to backfill each borehole utilizing a tremie pipe. The SJCEHD will be given the opportunity to inspect the grout mix prior to backfilling activities.