Resolution_DOE Covenant_Lower Co Shop

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December 29, 2016 | Page A-1 File No. 0504-119-00 APPENDIX A FIELD PROCEDURES AND BORING LOGS General Subsurface conditions at the Kittitas County Lower Shop site were explored on December 2, 2016, by advancing seven direct-push borings at the approximate locations shown on Figure 2. The borings were advanced between 8 to 10½ feet below existing site grade using a direct-push drill rig. Boring locations were established in the field using a site plan and measurements from onsite structures. Consequently, exploration locations should be considered accurate to the degree implied by the method used. Field methods generally were performed in compliance with the project Master Work Plan assessment procedures. Soil Sample Collection Soil samples were removed from the sleeve using clean nitrile gloves, and transferred into a laboratory prepared container, labeled with a waterproof pen, and placed on wet ice in a clean plastic-lined cooler. Direct-push drilling operations were observed by GeoEngineers staff who examined and classified the soil encountered, obtained soil samples, and maintained a continuous exploration log. Soil encountered in the borings was classified in general accordance with ASTM International (ASTM) D 2488 and the classification chart listed in Key to Exploration Logs, Figure A-1. Boring logs are presented in Figures A-2 through A-8. The logs are based on field data interpretation and indicate the depth at which subsurface materials or their characteristics change, although these changes might actually be gradual. Field Screening of Soil Samples GeoEngineers’ field representative performed field-screening tests on soil samples obtained from the borings. Field screening results were used as a general guideline to assess areas of possible petroleum- related contamination. The field screening methods used include: (1) PID screening; (2) visual screening; and (3) water-sheen screening. PID screening involves placing soil in a container and after agitating or warming, measuring total volatile organic compounds in the available head space. Visual screening consists of observing soil for stains indicative of metal- or petroleum-related contamination. Water-sheen screening involved placing soil in a pan of water and observing the water surface for signs of sheen. Sheen screening may detect both volatile and nonvolatile petroleum hydrocarbons. Sheens observed are classified as follows: No Sheen (NS) No visible sheen on the water surface. Slight Sheen (SS) Light, colorless, dull sheen; spread is irregular, not rapid; sheen dissipates rapidly. Natural organic matter in the soil may produce a slight sheen. Moderate Sheen (MS) Light to heavy sheen; may have some color/iridescence; spread is irregular to flowing, may be rapid; few remaining areas of no sheen on the water surface. Heavy Sheen (HS) Heavy sheen with color/iridescence; spread is rapid; entire water surface may be covered with sheen.