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Long Beach, CA, United States

Green K.W.,SCS Engineers
Pollution Engineering | Year: 2014

The American Society for Testing and Materials (ASTM) provides guidance on how to address the problem of vapors spreading in lower levels of building. There is evidence that chemical vapor in subsurface soil can penetrate building foundations at levels that raise health concerns for the occupants, creating liability issues for landlords, lenders, tenants, employers, and others. A vapor encroachment condition (VEC), is defined by the ASTM as the presence or likely presence of volatile organic compound (VOC) vapors in the subsurface of the property caused by the release of vapors from contaminated soil or groundwater either on or near the site. The process by which a VEC is determined is called a vapor encroachment screening (VES). ASTM E2600-10, Standard Guide for Vapor Encroachment Screening on Property Involved in Real Estate Transactions provides guidance and defines a two-tiered approach to assessing a potential VEC. Source

Porter S.,SCS Engineers
Pollution Engineering | Year: 2010

California's new Water Resources Control Board Construction General Permit became effective from July 1, 2010. The new permit requires all residential and commercial construction sites to monitor and prevent pollution from stormwater runoff. Landowners and contractors needed to have re-certified their stormwater pollution prevention plans (SWPPPs) by July 1, 2010 or have their permits terminated. The new general permit required the development and implementation of an SWPPP designed to ensure compliance during the construction and post-construction phases of the project. It needed to include a site map(s) that showed the construction site perimeter, existing and proposed buildings, lots, roadways, stormwater collection and discharge points, general topography, and drainage patterns. The SWPPP also needed to list the BMPs that was to be implemented to manage stormwater runoff, along with their placement. Source

A health risk-based surface contamination cleanup standard (SCS) for beryllium (BE) was developed to facilitate the safe transfer of property (equipment and buildings) previously used in BE-related processes. Previous SCSs for BE were primarily based on Department of Energy (DOE) housekeeping criteria rather than health risks. Quantitative health risk assessment methods were used to develop an occupational SCS that explicitly considers the relevant exposure pathways and toxicity endpoints, including both cancer and non-cancer endpoints. For the cancer endpoint at the 1E-06 risk level, the analysis resulted in an SCS of 17 μg/100cm2 based on resuspension of settled dust and subsequent inhalation exposure only (BE is regulated as a carcinogen by the inhalation route only). For the non-cancer endpoint, the analysis resulted in an SCS of 0.07 μg/100cm2 based on dermal absorption, incidental ingestion following dermal contact, and inhalation. The non-cancer SCS was determined virtually entirely by the dermal absorption exposure pathway, with negligible contributions from the incidental ingestion and inhalation pathways. This analysis shows that application of the non-cancer SCS in BE monitoring and control programs will adequately protect workers from both the cancer and non-cancer health effects of BE when surface contamination is the primary source of BE exposure. © 2011 Informa Healthcare USA, Inc. Source

Rogoff M.J.,SCS Engineers | Thompson D.,Wastech Services Ltd. | Hilton E.,SCS Engineers
MSW Management | Year: 2012

SCS developed a model for evaluating the operating and capital cost savings and airspace value that clients can use to evaluate the benefits of different ADC products. This model was applied at Wastech for the Cache Creek Landfill. The results of the financial model were combined with other business factors, such as environmental impact and the operating environment of the facility, to support a switch from soil cover to ADC. At the time of writing, Wastech has received the necessary approvals to switch to an ADC at its Cache Creek Landfill and is going through a procurement process for an ADC to help maximize the remaining life of the landfill. Source

Rogoff M.J.,SCS Engineers | Nicholls M.M.,SCS Engineers | Keyser M.,American Samoa Power Authority
18th Annual North American Waste-to-Energy Conference, NAWTEC18 | Year: 2010

American Samoa is an unincorporated territory of the U.S. roughly 2,300 air miles southwest of Honolulu and about 2,700 miles north of Australia. The largest and most populated island in American Samoa is Tutuila, which is located the territory's historic capitol of Pago Pago. The territory is home to the world's largest tuna cannery. Population growth has been dramatic and the island's energy costs have increased substantially in recent years. The American Samoa Power Authority (ASPA) is responsible for solid waste collection and disposal in the territory with landfilling being the primary mode of waste disposal. However, limited available land on the main island due to volcanic topography limits the long-term use of landfilling as the island's sole waste management tool. The relative isolated location of American Samoa and the instability of world oil markets have prompted ASPA to look at more environmentally and economically sustainable means of solid waste management. As an outgrowth of its research, ASPA submitted and received a technical assistance grant from the U.s. Department of the Interior to conduct an extensive waste composition study and EfW feasibility study to examine the advantages and disadvantages of efW for American Samoa. The results of these studies have been completed by SCS on behalf of ASPA, which is currently taking steps to permit and procure a 2.0 megawatt, modular efW facility that will go online in 2012 as part of a public private partnership. The lessons learned by SCs and ASPA during the course of the investigations are illustrative of the types of long-term, waste management and energy decision-making that many small communities will have to undertake to attain viable and sustainable alternatives. © 2010 by ASME. Source

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