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'Quik stop Market No, 132 August 28, 1994 Job No. 349132-31 Page 3 Two borings, one on the north and one on the south side of the tank complex, vdll be drilled to groundwater and will be used to assess soil contamination only. Exceltech will attempt to collect relatively undisturbed soil samples from beneath the in-place fuel storage tanks to assess the soil condition there, Should more soil characterization be necessary, Exceltech will determine the horizontal and vertical extent with further soil borings. Once the extent of hydrocarbon contamination has been found, the soil can be excavated where applicable. Soil analysis will determine the extent of excavation. Samples from the sidewalls will be taken every 20 feet, two to six samples will be taken from the bottom of the excavation (dependent upon size) and every corner will be n. This proposed exploration program will provide sampled at the base of the excavatio information which will help Exceltech assess the conditions of the soil and groundwater beneath the site. Exploratory Drilling and Sol] Sampling Before field work begins, Exceltech will determine utility locations by contact Y Underground Services Alert. Exceltech will drill five 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 and groundwater contamination. The borings for the monitoring wells will be drilled with an Exceltech truck-mounted drill rig using hollow-stem sugar to approximately 10 feet below the water table. The soil borings will be drilled to approximately 17 feet(the approximate depth to groundwater) with an 4; Exceltech drill rig using hollow-stem auger. The auger and other tools used in the hole will be steam-cleaned before use to minimize the possibility of cross-con m tamination. 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 fi 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 Y cuttings from the drilling will be placed on and covered with plastic sheeting and left at the site, Once analytical rep-Ats are known, the soil can be disposed of properly by Qulk Stop, h After recovery from the borehole the sampler will be disassembled and one sample { liner will be preserved fDr 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. F J5/H331-133X3 LT:80 06e 6z 5nu