Alco Pacific Site Removal Action Workplan (RAW)
- SCH Number
- Public Agency
- Department of Toxic Substances Control
- Document Title
- Alco Pacific Site Removal Action Workplan (RAW)
- Document Type
- NOE - Notice of Exemption
- Document Description
- The soil remedial activities (RA) include excavation, removal, and off-site disposal of approximately 3,600 cubic yards of lead contaminated soils from an industrial site in an industrial area. On-going groundwater monitoring will be conducted following the completion of the soil removal action. The primary chemical contaminate of concern is lead with levels ranging between 2.7 parts per million (ppm) to 3,000 ppm with a small area up to 85,700 ppm. Petroleum aromatic hydrocarbons, polychlorinated byphenyls and volatile organic compounds (VOCs) are found at 4.8, 9.5 and 0.3 ppm, respectively. These secondary Chemicals are collocated with the lead and will be removed with the lead soil removal. The proposed remediation goal for lead is 257 ppm, based on a baseline human health risk assessment for unrestricted/residential use exposure for soil. This cleanup goal for the Site is consistent with that applied previously to other residential and schools sites. Based on the prior site characterization the depth of the excavation will extend two feet below ground surface (bgs) and in three defined areas to seven feet bgs. Also, one isolated area will be drilled out to surgically remove contaminated soil at 41 feet bgs. A backhoe will be used for the shallow soil removal and field activities are expected to last two weeks. A bucket auger drill rig will be used to remove deeper soils and this field activity is expected to last one week. The deeper drill out will be immediately backfilled with bentonite to prevent problems associated with deeper soil removals. The drill rig will stop just above groundwater thereby avoiding water table release of the soil at the bottom of the boring hole. Post-excavation confirmation samples will be collected at the bottom and sidewalls of the excavation and step out locations from the drilled areas. These samples will verify all soil contamination equal or exceeding the targeted clean up goals will have been removed. The site characterization detected VOCs and heavy metals in groundwater under the site. DTSC has determined that a regional VOC plume exists. Onsite groundwater wells will be maintained and three down-gradient groundwater wells will be installed. On-going groundwater monitoring will be conducted as part of additional remedial activities following the completion of the soil removal action. The need for future groundwater remediation has not yet been determined. DTSC plans to begin the RA within four weeks after formal approval of the RAW and associated Health and Safety Plan. Excavation and backfilling activities are expected to last two weeks, drill rig activities are expected to last one week. As soils are excavated, they will be segregated into stockpiles and covered with heavy plastic sheeting until transported offsite for appropriate treatment/disposal in a box type truck trailer. Unauthorized access to the excavation area will be prevented. If the excavated soils contain greater than 350 ppm lead they will be disposed of at a Class 1 landfill, 150 miles away. The disposal trucks will travel approximately one half mile and then enter the 105 Freeway to travel to the designated treatment/disposal area. The excavation will be backfilled with clean imported soils, compacted and topped with chip seal. During the RA, and approved Health and Safety Plan will be enforced. The Site will be marked and access to the excavation area will be limited to prevent unauthorized access. Site access will be monitored during working hours and open excavation areas will be fenced at the end of each day. A Fact Sheet will also be distributed notifying nearby businesses not to enter the excavation areas due to the possible exposure to lead contaminated soils.
- Contact Information
Department of Toxic Substances Control
1011 N. Grandview Avenue
Glendale, CA 91201
Phone : (818) 551-2856
- Los Angeles
Notice of Exemption
- Exempt Status
- Categorical Exemption
- Type, Section or Code
- Title 14, Section 15061 (b) (3)
- Reasons for Exemption
- 1. The soil, approximately 3,600 cubic yards, will be removed in two weeks. The site is on the Hazardous Waste and Substances Sites list compiled pursuant to Government Code section 65262.5. However, the site soils will be remediated to residential standards and required no deed restriction upon completion of RA. The Site is not located in a biological sensitive area. No information indicates that the Site is in an archeologically sensitive or historic area. Distance to closest offsite residential receptors is one-quarter mile. 2. This small RA will not have a significant effect on the environment because of the following: a. Grading activity will not permanently alter the landscape. The Site will be restored to its near original condition. b. Dust suppression procedures will be followed during the excavation operations. This includes slightly spaying excavation areas with water prior to disturbing soils, slow movement of vehicles and equipment to prevent soil dispersal, wind speed monitoring and work stoppage if winds reach a range that creates offsite migration activities. One-quarter mile between the excavation and residences and sensitive receptors will minimize effects from fugitive dust. Air monitoring for particulates will be required during removal. c. There will be no substantial impact on the nearby public streets or traffic in the site vicinity. This activity will involve approximately fifteen shipments each work day prior or after rush hour. The transporting trucks will access the 105 Freeway within one half mile from the Site. The trucks will transport through an industrial area. Transportation vehicles will be driven by registered hazardous waste haulers and wastes will be manifested. d. A noise monitoring and prevention program will set maximum noise limits of 85 decibels outside the exclusion zone and 70 decibels at the Site perimeter. As drill rigs may operate at levels above 85 decibels, mufflers will be placed on the drill rig and sound barriers will be placed around the work area to maintain compliance with the approved noise monitoring and prevention program. All work shall take place during the regular working hours of 7:00 a.m. to 7:00 p.m. This will maintain a work environment consistent with city noise ordinances.
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