ARCHIVED REPORTS_XR0012711 - Laserfiche WebLink

Home Browse Search

4 Quilt Stop Market No, 132 .lob No. 349132-31 August 14, 1990 Page 2 Exploratory Drilling and Soft Sampling locations were selected in an attempt to assess the vertical and horExceltech will drill three borings at the approximate locations showizontal n on Figure 2. The limit of soil contamination. The boring for the monitoring well will be drilled with al Exceltech -stem auger to approximately 10 fe,;t below the truck-mounted driI1 rig using hollow water table. The soil borings will be drilled with an Exceltech trailer-mounted drill rig using hallow-stem auger. The trailer-mounted rig will be used to drill the borings due to Iimited vertical clearance under the service area canopy. If refusal is met by the trailer-mounted rig prior to reaching the desired depth, solid flight auger will be used to advance the boring. The auger and other tools used in the hole wiii be steam-cleaned before use to minimize the possibility of cross-contamination. Relatively undisturbed soil samples will be collected at 5-foot-depth intervals using a modified California split-spoon sampler equipped with three internal brass tubes, each 5 inches long and 2 inches in diameter. The sampler will be advanced 18 inches into undisturbed soil with a 140-pound hammer, Samples taken below water level will be collected using a 1-1/2-inch-inside-diameter, standard penetration sampler. This type of sampler has no internal brass liners and will be used primarily for soil logging, All soil cuttings from the drilling will be placed on and coveted with plastic sheeting and left at the site. Once analytical results are known, the soil can be disposed of properly by the client. After recovery from the,.borehole the sampler will be disassembled and one sample liner will be preserved for chemical analysis in the following manner. Both ends of the liner will be covered with aluminum foil and a plastic cap. It will then be labeled with a unique sample number and pertinent sample information, placed in a plastic Zibloc _ bag, entered on a chain-of-custody form, and packed in a chilled ice chest far transport to a laboratory certified by the State of California. See Appendix A for the Exceltech soil sampling protocol and laboratory procedures. The geologist will prepare a log of the subsurface conditions encountered during drilling and will classify the soils according to the Unified Soil Classification System and Munsell Soil Color Charts, All drilling logs will be reviewed by a certified engineering geologist. Groundwater Monitoring Well Construction After the soil sampling - p g is completed, Exceltech will install a groundwater monitoring wells in the designated exploratory boring. Exceltech will construct the monitoring wells in accordance with all permit requirements of San Joaquin County. The wells will be constructed of 2-inch-diameter, Schedule 40,flu hr polyvinyl chloride (PVC) blank and slotted casing, no glues or solvents will be used. After drilling the boring to the desired depth, the PVC casing will be installed through the