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Jay Swem <br /> 22 January 2021 <br /> Page 2 <br /> Geosyntec understands that the following wastes are generated during steel fabrication at Herrick's <br /> Stockton Steel facility: <br /> • Slag waste is generated from the welding process, and consists mostly of melted flux that <br /> is scraped off following welding. The waste may also include small quantities of unmelted <br /> flux and welding wire. <br /> • Blast waste is generated from processing steel product in a blast machine, and consists <br /> mostly of cast steel abrasive shot. The waste may also include small quantities of structural <br /> steel. <br /> • Cutting waste is generated from cutting of structural steel via plasma or acetylene torch. <br /> The waste consists of small particles of structural steel. <br /> These wastes are stored temporarily in 55-gallon steel drums, which are then transferred to larger <br /> containers provided by Herrick's waste management contractor. <br /> EVALUATION <br /> The following background information was considered in this evaluation: <br /> • ASTM provides a comprehensive set of standards for Portland cement manufacturing, and <br /> the primary requirements are outlined in ASTM C 150, Standard Specification for Portland <br /> Cement (April 2019). Most notably, ASTM C150 identifies chemical composition <br /> requirements for various types of Portland cement. <br /> • Standards issued by other organizations, such as AASHTO and ANSI, are closely aligned <br /> with those issued by ASTM. Additional requirements from AASHTO, ANSI, UBC and <br /> other organizations (such as the American Concrete Institute) identify material <br /> performance, design, and construction standards that do not relate directly to the <br /> manufacturing standards issued by ASTM. <br /> • The primary chemical compounds in Portland cement subject to the composition <br /> requirements in ASTM C150 include dicalcium silicate, tricalcium silicate, aluminum <br /> oxide, ferric oxide, magnesium oxide, sulfur trioxide, tricalcium aluminate, and <br /> tetracalcium aluminoferrite. <br /> • The primary chemical compounds in Portland cement are created with a mixture of raw <br /> materials that include calcareous raw materials (e.g., limestone, chalk, marl, sea shells, <br /> etc.) and other materials containing silicon, aluminum, and iron which include natural <br /> engineers I scientists I innovators <br />