The purpose of this study was to conduct an evaluation of the Maryvale Weed and Seed Coalition. First, a process evaluation was conducted to examine the implementation of policies, goals, and planned activities by Maryvale Weed and Seed. Afterwards, an impact evaluation was conducted to assess the efficacy of Maryvale Weed and Seed in combating crime and disorder in the designated program area. The sections below outline both the characteristics of the affected site and the methodology used to conduct the process and impact evaluations.

The W.R. Grace facility in Phoenix, Arizona, received vermiculite concentrate from the Libby, Montana, vermiculite mine. W.R. Grace Company has owned and operated the Arizona site since 1964. In 1964 W.R. Grace purchased the company that had previously occupied the site and, following the relocation of its vermiculite exfoliation furnace from Glendale, Arizona, began processing vermiculite concentrate and marketing it under the Zonolite® brand. The objective of this health consultation is to evaluate exposure pathways and potential health effects in those persons who, between 1964 and 2002, may have been exposed to Libby asbestos as a result of vermiculite concentrate processing activities and waste materials from the W.R. Grace exfoliation facility in Phoenix.