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L <br /> Site Description and History to off site residential and commercial populations. <br /> The site is less than one acre in size and is vacant with However,site uses may change in the future and in <br /> no remaining structures associated with historic gas- orderto restore the propertyto a condition thatwould be <br /> making operations.The site is surrounded by a chain- protective of all future land uses,PG&E has voluntarily <br /> link fence and access is provided through a locked gate selected to perform a soil cleanup.Implementation <br /> on South Sacramento Street. of the RAW will restore the site to residential <br /> cleanup standards. <br /> In 1913,the Sacramento Natural Gas Company <br /> constructed a manufactured gas plant on the site to Cleanup Alternatives Evaluated <br /> provide gas for the lighting,cooking,and heating needs The purpose of the draft RAW is to summarize and <br /> of local residents. PG&E took over gas production evaluate the nature and extent of impacts atthe Site and <br /> operations at the site in 1926 and all operations stopped to identify a preferred cleanup approach that prevents <br /> in 1928.From 1928 to 1958,PG&E used the site for or reduces potential risks to public health and the <br /> field operations,sold the site in 1958,and repurchased environment.Cleanup alternatives were evaluated based <br /> the site in 2006 for the purpose of environmental on a variety of factors including effectiveness,ability to <br /> investigation and cleanup activities. be implemented,state and public acceptance,and cost. <br /> Site Investigations Soil Cleanup Alternatives:Three cleanup <br /> Since the mid-1980s,several phases of environmental alternatives were evaluated for soil at the Site: <br /> investigations have been conducted to determine if old 1. No Action-This alternative was evaluated to <br /> gas plant residues are present in soil and groundwater. provide a baseline against which other cleanup <br /> These investigations identified varying levels of alternatives can be compared.This alternative <br /> polycyclic aromatic hydrocarbons(PAHs),total would involve no cleanup actions and the Site <br /> petroleum hydrocarbons(TPH)and lead in soils in the would remain in its current condition. <br /> interior and exterior areas of the site. 2. Containment/Capping In-Place -This <br /> The majority of the impacts in site soils are found from alternative would involve placing an asphalt or concrete <br /> a depth of one to 7 feet below the ground's surface,and cap over the entire site,without any soil treatment or <br /> a few areas have deeper impacts.Impacts to shallow soil removal.A deed restriction would be placed on the site <br /> extend off-site from 10 to 15 feet to the south and west. in order to prohibit activities that could damage or <br /> Based on groundwater sampling and the significant Penetrate the cap and make sure that any underlying <br /> separation between the impacted soils and groundwater, soils that are disturbed are properly managed and <br /> it has been determined that groundwater has not been disposed of. <br /> impacted by historic gas making activities. 3.Excavation and Off-Site Disposal of Soils-This <br /> Human Health Risk Assessment alternative would involve removing and <br /> transporting impacted soil in both onsite and <br /> A Human Health Risk Assessment(HRA)was <br /> offsite areas to a permitted facility for disposal. <br /> conducted to determine if chemicals in the soil pose a <br /> The site would be backfilled with clean soil, <br /> risk to human health or the environment.The HRA <br /> determined that the site does not pose a significant risk graded and restored. <br /> 2 <br />