Cost Allocation, Litigation and Mediation Services

Optimum^TM Remedial Design and Feasibility Services

ART staff developed an analytical fate and transport model to predict migration of chlorinated volatile organics in groundwater for a Superfund Site. The model was used in cost allocation mediation by a consortium of more than 20 PRPs with the principle PRP. The efforts of ART staff resulted in substantially decreasing the financial obligation for our clients in the final mediated settlement.

ART staff provided mediation support for an industrial company involved in a multi-party groundwater plume with chlorinated solvents. ART staff reviewed technical documents, performed numerical groundwater modeling, and provided recommendations for on-site investigation by our client. The efforts of ART staff resulted in minimal financial obligation for our client in the final mediated settlement for regional hydraulic control and cleanup.

ART staff performed the remedial design, and optimization of multi-phase extraction (soil vapor, groundwater and floating product) and hot air injection systems using OPTIMUM^TM for sites located at NAS Midway Island, NAS North Island, and US COE Sharpe Army Depot. The designs included using a combination of 150 horizontal / vertical extraction / injection wells for multi-phase extraction, and hot humid air injection to enhance volatilization and decrease floating product viscosity for effective removal. The remedial design for the sites, which were impacted with halogenated hydrocarbons, primarily TCE and PCE, achieved the following remedial objectives:

• Clean up goals were achieved

• The nesting habitat and flight path of the sea birds including albatross and shearwater was maintained without interference of above ground equipment and piping

• Minimized water mounding during SVE/air sparging. This mitigated the spread of the contaminants to other sensitive areas like the Pacific Ocean

• Minimized remedial installation and O&M costs by optimizing the remedial design

ART is currently providing dewatering consultation services to a major developer for their proposed high rise luxury condomimium development located in Los Angeles, California. ART performed aquifer tests, and using the results of the aquifer tests, developed a groundwater flow model to design and evaluate the effectiveness of temporary and permanent dewatering systems. ART staff also evaluated the impacts of dewatering on the settlements of the municipal utlilities and neighborhood properties. The results of the evaluations have been used by the Clients to obtain the necessary permitting and approvals for the proposed developments from the local agencies.

ART is currently providing dewatering consultation services to mitigate the impact of seepage from the adjoining hillside and the groundwater from the subsurface on construction activities for a proposed retail development located in Oakland, California. ART staff evaluated several dewatering alternatives, designed the dewatering system(s), and supervised the installation of Trench and Sump and Deep Well dewatering systems. Currently, the dewatering systems are helping mitigate the seepage and groundwater flow at the site.