APPENDIX 1 MORPHOLOGICAL AND PEDOLOGICAL SKETCH OF ROCKY FLATS SAMPLING SITES (See Figure 1 in text for locations) Site I The site is a flat to slightly rolling terrace surface with modest plant cover. The soil is very rocky to sandy and light in color. Site II The site is a gently dipping lower slope segment facing the south-southwest generally consisting of colluvium, possibly interfingering with fluvial debris from an adjacent intermittent stream. The soil is sandy to clayey, grey to brown in color, and with modest to heavy grass cover. Site III The site is a steeply dipping north-facing slope on colluvium with a light sandy soil and light to modest cover punctuated with cacti and yucca. The surface is interspersed with rock outcrops and there was considerable rock in the upper 5 cm of soil. Site IV The site is a gently undulating valley bottom made up of fluvial sediments. The soil is tightly packed, grey to brown, and predominately clayey with closely cropped vegetation. The area appeared to be frequently grazed by cattle. 673