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1 � Artesian Environmental Consultants, Inc. Standard Operating Procedures ' SOIL BORINGS AND SAMPLING Soil borings are lithologically logged by Artesian staff under the du-ection and supervision of t a state-registered geologist using the Unified Soil Classification System (USCS) During drilling, discrete soil samples are collected at approximately 5 0 foot depth intervals to the top of groundwater for lithologic and hydrogeologic descnption and possible chemical ' analysis Soil samples for chemical analysis are collected in pre-cleaned, thin-walled biass tubes, b- t inches long and 2-inches m 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 length 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 retrieval of the split-barrel sampler using an organic vapor analyzer (OVA) or a photolonizaton 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 Cahfomia Regional Watei Quality Control Board (RWQCB) procedures described in the Leaking Underground Fuel Tank (LUFT) Field Manual, the Tri- Regional Boar d Staff Recommendations for Pr ehminat y Evaluation and Investigation of Unde7ground Tank Sites, and local regulatory guidelines Upon removal from the sampler, the selected brass tubes aie unmediately capped on both open ends with Teflon tape, tnmrried and capped with plastic 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 degrees Celsius A thermometer is kept in the ice chest to ensuie that the proper temperature is maintamed The samples are then delivered under chain-of-custody to a state-certified hazardous materials testing laboratory ' The above mentioned procedures minimize the potential foi cross-contamination and volatlization of volaule organic compounds (VOC) prior to chemical anal}sis The sampling equipment is cleaned with an Alconox detergent wash and two dioruzed water ' rinses between samples and steam-cleaned with all the other dulling equipment between bonngs to prevent cross-contanunaton r