United States Air Force Headquarters, 3Rd Wing Elmendorf AFB, Alaska
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11 United States Air Force Headquarters, 3rd Wing Elmendorf AFB, Alaska Debris Removal Actions at LF04 Elmendorf AFB, Alaska FINAL REPORT April 10, 2003 TABLE OF CONTENTS 1 Introduction ............................ ................ .............................. 1 1.1 Project Objectives ............................................ 1 1.2 Scope of Work ................................................................... 1 1.3 Background Information ............................................ 1 1.3.1 Historical Investigations and Remedial Actions ........................................ 3 2 Project E xecution .................................................................................................................... 3 2.1 Mobilization ..................................................................................................... 3 2.2 E quipm ent ....................................................................................................................... 4 2.3 T ransportation ................................................................................................................. 4 2.4 Ordnance Inspection ...... ........................................ 4 2.5 Debris Removal ................................................................................................... 4 2.6 Debris Transportation and Disposal ...................................... 5 2.7 Site Security .................................................................................................................... 5 2.8 Security Procedures ...... ........................................ 5 2.9 Site Preparation Plan.............................................5 2.9.1 Erosion Control .................................................... 2.9.2 Spill Prevention.......................................................................................................6 2.9.3 Asbestos Identification and Removal Procedure .................................................... 6 2.10 Demobilization and Closure ........................................................................... 6 2.11 Photographic Log...... ................................ 2.12 Conclusions and Recommendations .................................................................... 6 R eferences ....................................................................................................................................... 7 FIGURE 1 - SITE LOCATION APPENDIX A - Disposal Certificates APPENDIX B - Project Photographs i EXECUTIVE SUMMARY Approximately 18 tons of nonhazardous solid waste was removed form the beach along LF04 during cleanup activities conducted in September-October 2002. Only exposed surface debris that could be removed without disturbance of the tidelands, vegetation, and bluff face was removed. Excavation activities were not conducted to remove debris. The debris removed included a few very heavy pieces, such as vehicle parts, as well as electrical parts, wire, rubber products, and metallic slag. The nonhazardous debris was disposed of at the Anchorage Municipal Landfill. No hazardous waste was encountered or removed during the cleanup. Approximately 40 pieces of rifle ordnance were discovered at LF04 during the cleanup. The ElmendorfUXO team was dispatched to the site, where the ordnance was collected and removed from the site. ii 1 Introduction The LF04 cleanup involved the removal of approximately 18 tons of surface debris, an decrease of 16 tons from the previous year. Fieldwork was performed between September 16 and September 30, 2002. This report describes the work performed during field activities. The project approach, work activities, and final site conditions are summarized. 1.1 Project Objectives Objectives of the cleanup activities were: · To mitigate human exposure to landfill wastes and debris; and * To conduct removal activities in a manner that minimized erosion and preserved existing soil and bluff surfaces. 1.2 Scope of Work The scope of work for this project included the following activities * Completion of applicable planning and reporting documents; · Removal of surface debris along the western perimeter of LF04 (base of the bluff and beach area) while not disturbing the tidelands, vegetation, and bluff face; * Characterization and removal of potentially hazardous waste encountered during removal of surface debris. 1.3 Background Information Elmendorf Air Force Base (AFB) occupies 13,103 acres of land in Anchorage, Alaska. The northwest side of the base is bordered by the Knik Arm of Cook Inlet (Figure 1). The project area is approximately 3,000 feet long and 600 feet wide. It is located along the beach of Cook Inlet near the western border of Elmendorf AFB, the site of LF04, an inactive landfill. During high tides, the sea level can rise to the base of the bluff. Tidal and wave action cause erosion along the base of the bluff resulting in landslides and slumping, which has exposed landfill debris. The cleanup area is located along the beach below the bluff, which consists of sandy gravel with occasional cobbles and boulders. The lower beach face consists of sandy silt typical of the Cook Inlet tidal flats. The southern end of the cleanup area is bordered by a tidal marsh vegetated with short grasses. (Photograph 1.) 1 V Figure 1 Historical Map of Project Area (USAF1996) Note: Debris and wastes on figure hove been removed In subsequent removal actions. 2 1.3.1 Historical Investigations and Remedial Actions LF04 was used as a dump from 1945 to 1957. LF04 was used for the disposal of vehicles, equipment, electrical parts, 55-gallon drums, general trash, and garbage (USAF 1996). Debris removal actions have been conducted at LF04 annually since 1998. Cleanup activities in 1998 removed approximately 15 tons of general refuse and 10 tons of recyclable materials. No unexploded ordnance (UXO), asbestos containing material (ACM), or hazardous materials were discovered during the 1998 cleanup activities (USAF 1999a). Approximately 29 tons were recovered from the site during 1999 project activities. The recovered material consisted of general refuse. Abandoned munitions, including small arms, shells, casings, and a howitzer case were removed by the USAF Explosives and Ordnance Disposal (EOD) Unit during the completion of 1999 field activities. No ACM or hazardous materials were identified during the 1999 field activities (USAF 1999b). In 2000, approximately 20 cubic yards (12 tons) of nonhazardous solid waste was removed from the beach (USAF 2001). In 2001, approximately 34 tons of nonhazardous solid waste was removed from the beach. Additionally, in 2001, a steel cylinder approximately three feet long by one foot in diameter was discovered, the contents of which were unknown. The onset of winter in 2001 impeded the removal of this object in 2001. A delay to 2002 was agreed to by the USAF, EPA, and ADEC for safety (cold, snow, and ice) and associated cost issues that should not be a problem in the warmer summer months. After removal and testing in spring 2002, the conclusion was made that the liquid inside was seawater. The pH of this water was in the 6 to 7 range, which is similar to seawater. No unexploded ordnance was located at LF04 during site inspections or the cleanup during 2001. 2 Project Execution 2.1 Mobilization Mobilization activities were completed between September 16 and 30. Mobilization activities included the following: * Set up equipment at the fenced staging area in the APA yard (gravel pad) located at the southern end of the project area; * Set up of the sanitary facilities, potable water, and end dump; * Construction of temporary barriers to control access to the work area during project activities; and, * Transportation of equipment and supplies to the site. Personnel were transported to the site daily. Travel to and from the site was minimal during project activities to reduce impacts to the beach and tidal flats, particularly the marsh area at the southern end of the cleanup area. Cellular telephone service was used as the site communication system. For security purposes, an existing fenced yard was utilized on the edge of the cleanup 3 area (the APA yard). Equipment, waste bins, toilet facilities, and equipment fuel were stored in the fenced area. 2.2 Equipment Equipment on site included the following: · Polaris Ranger six-wheeled all terrain vehicle (ATV) equipped with tracks (Photographs 10-11); * Caterpillar 315 tracked excavator with thumb (Photographs 2-5); * Caterpillar 966 front-end loader (Photographs 19-20; * Morooka tracked dump truck (Photographs 13-15, 18); * Kenworth end-dump truck (Photographs 21-22); * International water truck (Photographs 29-29); and * Hand tools including saws, cable-cutters, cutting torch, and shovels. The contractor's facilities and resources were utilized to mobilize equipment to the site. 2.3 Transportation The purpose of the transportation plan was to ensure safe transportation of materials, equipment, and personnel to the project site and debris from the project site. To keep the environmental impact to an absolute minimum, crews cleared brush along the shoreline and constructed an expedient corduroy road to gain access to the site on stable ground. Equipment used on the beach was exclusively tracked equipment, including the Morooka dump truck. The tracks spread the weight of the Morooka over a greater footprint which resulted in a minimal impacted to the traveled surface. (Photographs 13-15.) The front-end loader, Kenworth dump truck and International water truck were used