Projects

Service: Soil Characterization
Facility Type: Redevelopment Property

Description:

Since the site is located near to the Maher Zone and in an area identified as naturally occurring asbestos and as part of development, ACC recommended that the site be entered into the San Francisco Department of Public Health-Environmental Health Voluntary Remedial Action Program (VRAP). This program was developed to protect human health, cleanup the environment and return property back to productive use. Entering the subject property into the VRAP includes characterizing onsite soils for potential constituents of concern to address potential human health issues and to characterize soils for disposal.

ACC conducted five exploratory soil borings to obtain information pertaining to the soil lithology at the site and to characterize on-site soils prior to redevelopment. After completion of sampling, the borings were filled with cement grout to just below the surface. Ten soil samples were submitted to a state-certified analytical laboratory following standard chain of custody procedures.

Each sample is identified separately on the chain of custody and noted for composite analysis for the depth intervals identified. Select soil samples were analyzed for the following constituents under standard turnaround time:

• Volatile Organic Compounds (VOCs) and Total Petroleum Hydrocarbons as Gasoline (TPHg) by EPA Method 8260B
• Total Extractable Petroleum Hydrocarbons (TEPH) (Diesel (TPHd) and Motor Oil (TPHmo)) by EPA Method 8015M,
• Semi-Volatile Organic Compounds (SVOCs) by EPA Method 8270C Cam 17 Metals by EPA Method 6010B. In addition, one sample was analyzed for Asbestos by CARB Method 435

ACC concluded that elevated levels of TPH as Diesel and elevated levels of select Heavy Metals appear to be impacting subsurface soils across the site. In addition, the Site is located on an area overlying Serpentinite ultramafic bedrock that contains a naturally occurring mineral Serpentine, which is known to contain up to15-20% Chrysotile Asbestos.

It is ACC’s understanding that the site is going to be redeveloped as a residential structure with a subsurface parking garage. This redevelopment will displace subsurface soil. The impacted soils at the site will be excavated and disposed of prior to the redevelopment of the site.

ACC recommends preparing a Site Mitigation Plan and an Asbestos Dust Mitigation Plan to outline and identify any remedial/excavation activities and health and safety measures needed for excavation and soil handling during the development of the site.