Laserfiche WebLink
' Mr.Michael Oliphant—CEMC <br /> Remedial Action Plan <br /> ' Fortner Tracy Pump Station June 23,2011 <br /> Page 3 of 4 <br /> SOIL EXCAVATION <br /> ' SAIC proposes to excavate affected soil from an area approximately 120 feet long, <br /> 115 feet wide, and 8 to 10 feet deep with an estimated volume of 4,000 cubic yards <br /> (total volume includes sloped sidewall material). The excavation depth will be <br /> ' determined by the delineation soil sample results and the observed depth of separate- <br /> phase oil affected soil during the excavation activities. The depth of excavation will not <br /> exceed 10 feet below ground surface(bgs). The lateral extent of the proposed <br /> ' excavation is shown on Figure 3. Global positioning system equipment with sub-meter <br /> types and conditions observed in the excavation <br /> accuracy will be used to identify the predefined extent of the proposed excavation. As <br /> ' <br /> practical, SAIC will document the soiwalls and collect photographic documentation of the excavation and backfilling <br /> activities. <br /> All excavation work will be performed in accordance with California Division of <br /> Occupational Safety and Health regulations. For planning purposes, SAIL anticipates <br /> the sidewalls will have 1:1 slopes from ground surface to 6 feet bgs and a vertical <br /> sidewall below 6 feet bgs. An Occupational Safety and Health Administration(OSHA) <br /> Competent Person will conduct daily inspections of the excavation and adjacent areas <br /> for evidence of potential cave-ins, indications of failure of protective systems, <br /> hazardous atmospheres, or other hazardous conditions. The OSHA Competent Person <br /> will conduct an inspection prior to the start of work and as needed throughout the shift. <br /> Inspections shall also be made after every rainstorm or other hazard-increasing <br /> occurrence. <br /> ' Dust control measures, such as application of water, will be used during excavation <br /> activities to minimize generation of airborne dust. The excavation contractor will be <br /> responsible for monitoring airborne dust at the upwind and downwind site perimeters <br /> ' during all dust-generating activities (i.e., operation of heavy equipment and loading) <br /> using direct-reading instruments (e.g., Mini-Ram pDR-1000). <br />' Permits from the appropriate regulatory agencies will be obtained and the area properly <br /> cleared of subsurface utilities prior to excavation. <br /> WASTE DISPOSAL <br /> Pre-profile soil analytical results were submitted to a CEMC-approved waste disposal <br /> facility for waste profiling and acceptance. All excavated soil will be loaded directly <br /> into waste-hauling trucks and transported off site to the disposal facility by a California- <br /> registered hazardous waste hauler. The soil will be disposed of at a nearby Class II <br /> landfill (Forward Landfill in Stockton, California or Altamont Landfill in Livermore, <br />' California). Typical waste-hauling trucks can transport approximately 15 cubic yards of <br /> excavated soil. Based on pre-excavation delineation sampling results, the expected <br /> volume of soil to be generated will be approximately 4,000 cubic yards. <br /> tEXCAVATION BACKFILLING <br /> The anticipated volume of affected soil hauled off site for disposal will be <br />' approximately 4,000 cubic yards. After the excavation activities have been completed, <br /> the excavation will be backfilled with imported clean soil. The backfill material will be <br /> placed in the excavation in loose lifts and compacted(using a large sheepsfoot <br /> I <br /> I <br />