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f Artesian Environmental Consultants, Inc. Standard Operating Procedures SOIL BORINGS AND SAMPLING Soil borings are lithologically logged by Artesian staff under the direction and supervision of t a state-registered geologist using the Unified Soil Classification System (USCS). During drilling,discrete soil samples are collected a:approximately 5.0 foot depth intervals to the top of groundwater for litWogic and hydrogeologic description and possible chemical analysis. Soil samples for chemical analysis are collected in pre-cleaned,thin-walled brass tubes,6- inches long and 2-inches in the outside diameter. Three of these sample tubes are set in a 2- inch inside diameter, 18-inch modified California split-barrel sampler. The split-barrel sampler is driven its entire lengh using a drop hammer,typically 140 pounds. The sampler is extracted from the borehole and the brass tubes,containing the soil samples are removed. The third soil sample is screened in the field immediately after rcriieval of the split-barrel sampler using an organic vapor analyzer(OVA)or a photoionization detector(PID). For procedures,please refer to the Artesian Environmental Consultants, Inc. Standard Operating Procedures for Collecting Organic Vapor Data from Soil Samples. Soil sampling is performed in accordance with California Regional Water duality Control Board(RWQCB) procedures described in the Leaking Underground Friel Tara((LUFT)Field Mall"afl,Ehct Tri- Regional Board SraffRecootmeirdationsfor Preliminary Evaluation and lrrt,estigation of Underground Tank Sites,ar„i.local regulatory guidelines. ,> Upon removal from the sampler,the selected brass tubes are immediately rapped on both open ends with Teflon tape,trimmed and capped with plast,c caps, The samples are then labeled and placed in individual see-through ziplock plastic bags. The samples are stored in an ice chest with crushed ice to maintain a constant temperature of 4 deeTees Celsius. A thermometer is kept in the ice chest to ensure that Lhe proper temperature is maintained. The samples ue then delivered under chain.-of-custody to a state-certified hazardous materials testing iaboratory. The above mentioned procee •-es minimize the potential for crass-contamination and volarilization of volatile organic compounds(VOC)prior to chemical analysis. The sampling equipment is cleaned with an Alconox detergent wash and two dionized water rinses between samples and steam-cleaned with all the other drilling equipment between borings to prevent cross-contamination.