WORK PLANS - Laserfiche WebLink

Home Browse Search

� i E e.J Work Plao { Canepa's Car Wash November 17, 1998 Page -2- f 3.1 SITE PREPARATION Prior to the fieldwork, drilling permits will be obtained from the San Joaquin County PHS/EIiD. The proposed boring locations will be marked with white paint and Underground Service Alert (USA) will be notified at least 72 hours in advance of the fieldwork. However, because the proposed boring locations ` l are on private property, utilities contacted by USA will not mark their lutes past property lines and into the site. Therefore, it is the responsibility of Canepa's Car Wash to locate and identify underground utilities in and near the work area. The PHS/EHD will be notified of the fieldwork schedule at least 72 k : I hours in advance. 3.2 DRILLING PROCEDURES The fieldwork will include the installation of six borings, three of which will be completed as monitor wells. The proposed locations shown in Figure 2, Appendix A. The boreholes will be drilled by Spectrum Exploration, Inc. (License #512268) under the supervision of a Condor geologist. Prior to _ - commencement of work each day, a tailgate safety meeting will be held and the site-specific Health and Safety Plan will be discussed with and presented to all crew members for their signatures. The borings will be drilled using 6-inch O.D., continuous-flight, hollow-stem auger. The monitor well borings will be drilled to a depth of 45 feet bgs. The soil borings will be drilled to a depth of approximately 35 feet. The auger will be steam cleaned before each borehole is drilled. The soil sampling equipment (i .e., split-spoon) will be cleaned prior to collecting each sample. The cleaning procedures will consist 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. l Upon completion of the drilling and sampling, the three soil borings will be grouted with a cement slurry containing 3 to 5 percent bentonite. The slung will be tremied into the borehole to avoid bridging. All decontamination rinsate produced during the field work will be placed in a 55-gallon drum, sealed, labeled, and left on site pending laboratory analyses. Disposal of hazardous materials, if any, will be the responsibility of Canepa' s Car Wash. I 3.3 SOIL SAMPLING Soil samples will be collected at five-foot intervals from the surface to the capillary fringe in all six borings. If significant lithological changes are encountered during the installation of the monitor wells, a soil sample will be collected from each significant lithologic unit for laboratory analysis. Soil samples will be collected in each borehole using a California-modified, split-spoon sampler fitted with three clean, brass liners. During the sampling, the split-spoon sampler will be driven ahead of the auger. The uppermost liner will be discarded. The middle sample liner will be prepared, as described below, for possible shipment to the laboratory and the bottommost liner will be used for geological logging and for field screening using an organic vapor analyzer (OVA). The soil samples will be logged according to the I Unified Soil Classification System. Drilling logs will be prepared and will contain field observations including soil type, estimated moisture content, presence of staining or odor, and field OVA measurements. L � CONDOR