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Quik Stop Market No. 132. August 14, 1990 Job No. 349132-31 Page 2 Exceltech will drill three borings at the approximate locations shown on Figure 2. The locations were selected in an attempt to assess the vertical and horizontal limit of soil contamination. The boring for the monitoring well will be drilled with an Exceltech truck -mounted drill rig using hollow -stem auger to approximately 10 feet below the water table. The soil borings will be drilled with an Exceltech trailer -mounted drill rig using hollow -stem auger. The trailer -mounted rig will be used to drill the borings due to limited 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 will 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 6 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 covered 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 Ziploc bag, entered on a chain -of -custody form, and packed in a chilled ice chest for 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 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, flush -threaded 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