Children’s Activity Patterns (CHAPS)

The ORETF designed the CHAPS routine to reflect the types of activities commonly performed by children on residential turf. This was accomplished by using data from a National Human Activity Patterns Survey (NHAPS), conducted by USEPA, to identify the specific activities performed by children and the duration of time spent performing each activity. The ORETF also sponsored a study at Stanford University in which children were videotaped while at play. The videos were converted into data that quantified the degree of contact between body parts and the turf. With the NHAPS and Stanford University data, the ORETF designed a 2-hour routine in which adults performed activities commonly performed by children on residential turf. The routine design also ensured that the degree of contact with turf equaled or exceeded the degree of contact measured in the Stanford University study and NHAPS.

The ORETF conducted a study for determining the relationship between TTR and exposure as estimated by the CHAPS routine. The algorithm developed from this study provides a more refined and realistic means of determining the relationship between TTR and exposure.