About 128 air samplers and CAMs presently in service to detect and document potential radioactive release from `H` and `F` area tank farm ventilation stacks are scheduled for replacement and/or upgrade by Projects S-5764, S-2081, S-3603, and S-4516. The seven CAMs scheduled to be upgraded by Project S-4516 during 1995 are expected to provide valuable experience for the three remaining projects. The attached document provides design guidance for the standardized High Level Waste air sampling system.

A well-stirred reactor experiment and chemical kinetic modeling effort were performed in order to study the effect of ethylene oxidation on the conversion of nitric oxide (NO) to nitrogen dioxide (NO{sub 2}). Parameters examined in this study were temperature (1003--1260K) and input hydrocarbon concentration (220--3270 ppmv wet). The stirred reactor residence time was maintained at {approximately}2 milliseconds. Kinetic calculations indicated the NO to NO{sub 2} conversion proceeded through the ``HO{sub 2} mechanism``, NO + HO{sub 2} {yields} NO{sub 2} + OH, and the majority of the conversion occurred within the well-stirred reactor. The chemical kinetic mechanism used to model the percent conversion of the NO to NO{sub 2}, C{sub 2}H{sub 4}, CH{sub 4}, CO and CO{sub 2} concentrations showed excellent agreement with the experimental data, thereby validating the ethylene oxidation mechanism. Reaction pathway analysis and logarithmic sensitivity analysis were combined to analyze the ethylene oxidation structure and HO{sub 2} production process. The analysis revealed the primary ethylene oxidation pathway has the potential to form two HO{sub 2} radicals per ethylene consumed, thus making the ethylene a significant agent in promoting conversion of NO to NO{sub 2}. The secondary ethylene oxidation pathway is a potent chain branching process which furthers ethylene …

During 1992, a series of hydrologic characterization tests were conducted at the well 4A -- 4T test facility complex. Details concerning these tests are described in Swanson (1992). Two of the tests, a constant-rate discharge test conducted on March 30, 1992 and a slug interference test performed on April 15, 1992, are the focus of this report.

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.