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4 Results <br /> Annual Grassland — <br /> Annual grassland occurs in narrow strips adjacent to crops,including the spaces between orchard <br /> rows. Commonly found constituents of this habitat type within the study area are barnyard grass _ <br /> (Echinochloa crus-galli), feather fingergrass (Chlorin virgata), tumbleweed(Salsola tragus), <br /> yellow star-thistle(Centaurea solstitialis), Bermuda grass(Cynodon dactylon),cheeseweed <br /> (Malva parvii lora),common purslane(Portulaca oleracea), ripgut brome (Bromus diandrus), — <br /> and spotted spurge(Chamaesyce maculata). <br /> Riparian Scrub <br /> Hospital Creek is ephemeral and channelized and flows east through the study area. The channel <br /> is lined with riprap and gravel downstream of the box culvert crossing of the Delta-Mendota — <br /> Canal,and transitions to a mostly unlined channel along the study area's southern boundary. <br /> Riparian habitat is limited to Hospital Creek and is composed of mulefat scrub and scalebroom <br /> scrub. Mulefat scrub is characterized by mulefat(Baccharis salicifolia),narrowleaf willow(Salix — <br /> exigua), and arroyo willow(S. lasiolepis). Associated species in this habitat include mustard <br /> (Brassica sp.), heliotrope(Heliotropium curassavicum), and curly dock(Rumex crispus). Mulefat <br /> scrub is limited to the bottoms of irrigation ditches and Hospital Creek or other areas where water <br /> may collect. Scalebroom scrub is characterized by Scalebroom(Lepidospartum squamatum), <br /> California sage(Artemisia californica),mugwort(A. douglasiana),tree tobacco(Nicotiana <br /> glauca), gumplant(Grindelia camporum), pigweed(Chenopodium album),and Mexican tea — <br /> (C. ambrosioides). Scalebroom scrub is not typically classified as a riparian community; <br /> however, in the study area, elements of this community can be found growing along the steep, _ <br /> well-drained banks of irrigation ditches and Hospital Creek. <br /> 4.2.3 Site Hydrology Overview <br /> The study area sits on nearly level to very gently sloping alluvial fans that historically drained to <br /> the northeast. Most of the natural hydrology of the site is interrupted by roadways,drainage <br /> canals,and agricultural ditches or has been altered through grading for agricultural purposes. <br /> Although the study area previously drained overland toward the San Joaquin River, most of the <br /> site now drains to Hospital Creek,overflow irrigation basins, or various non jurisdictional <br /> roadside ditches and agricultural ditches and is drained by surface percolation, overland sheet <br /> flow, small rills, or roadside and agricultural ditches. _ <br /> 4.2.4 Jurisdictional Waters of the United States <br /> An overview of jurisdictional features(waters of the United States) is shown on Figure 3. <br /> Wetland determination data point sheets are provided in Appendix A. Table 1 provides a <br /> summary of jurisdictional features including average width, linear feet, and acreage for all <br /> features within the study area. <br /> VemaGs Qua"Mining and Re amation Project 4-6 ESA 1203015 <br /> Wetland Delineation Report February 2006 <br />