Arcwood Environmental LLC

At the Indianapolis Motor Speedway, asphalt mix was first placed on the main oval original brick surface in 1936 to fill in the rougher sections.All four turns were completely paved with asphalt in 1937.In 1938, the entire track was paved with asphalt except for the middle portion of the front straightaway, where the original brick was still left exposed.The entire 2-1/2 mi track was completely paved in 1976, and then again in 1988 and 1995.In 1999 the new Formula One track was built for the inaugural Grand Prix.The most recent repaving project on the main oval occurred in 2004; utilizing mixes that were designed by Heritage Research Group, produced by Milestone Contractors and placed by Grady Brothers using a special paving machine.Formulation to application challenges for any race track are discussed including precision rolling to achieve the necessary compaction, laying the mat as close to the retaining wall as possible, using a consistent feed of material and a steady pace to limit the number of transverse joints in the mat, with photographs telling much of the story.

A review discusses the changes in processing and slag management to obtain a consistent product for highway application.Steel slag is best used in pavement surfaces where the benefits of its micro and macrotextures can be used to reduce the severity of accidents and save lives.When placed into surface mixtures,.Steel slag has added benefit of higher strength to prevent rutting and extend pavement life.

The presence of glycol compounds in some pretreated industrial wastewater effluents can cause the detection limits for semi-volatile organic compounds to be too high for verifying compliance with the Total Toxic Organics (TTO) monitoring requirement in the discharge permit.The source of the glycols is from seemingly small amounts of hydraulic fluid leakage from the manufacturing area of the facility.One option for dealing with these interferences would be to construct addnl. wastewater pretreatment equipment even though there may be no reason to suspect the actual presence of TTOs in the pretreated effluent.A more desirable alternative would be to improve the anal. test method such that the required detection levels can be achieved.Liquid-liquid extraction (LLE) of this type of effluent for semi-volatile compounds as outlined in EPA SW-846 3500B cannot attain a 1 mL final extract volumeDichloromethane, the normal extraction solvent used, results in extraction of ∼10 mL of a viscous residue composed mainly of the glycol compoundsSeveral modifications to the standard extraction procedure were explored.Initially,we demonstrated successful back-extraction of the TTO semi-volatile compounds of interest from the 10 mL residual glycol matrix; however, it would be more efficient to prevent extraction of the glycols from the water in the first place, while still extracting the TTO compounds of concern.To accomplish this, we modified the LLE by replacing dichloromethane with hexane, but a significant amount of foam and emulsion formed using hexane that did not occur with dichloromethane.An addnl. technique under investigation includes solid-phase extraction technol. using an automated extraction system and 47 mm solid phase extraction disks.This procedure allowed the glycol compounds to pass through the disk to water waste.Data from spiked samples are presented from the feasible approaches and pros and cons discussed.