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III. Environmental Setting,Impacts, and Mitigations F. Vegetation and Wildlife roads. These trees range from 8 to 71 inches dbh,with an average diameter of approximately thirty inches. it lif W d e Wildlife species observed on the site are noted in Table IH.F.1. Other species not observed during field reconnaissance but commonly associated with disturbed grasslands,agricultural lands, and modified drainages in this region include western harvest mouse(Reithrodontomys megalotis),Botta's pocket gopher(Thomomys bottae),California vole(Microtus californicus), opossum (Didelphis virginiana),turkey vulture(Catharses aura), plain titmouse(Parus inornatus), Brewer's blackbird(Euphagus cyanocephalus),western toad(Bufo boreas),Pacific tree frog(Hyla regilla),common garter snake(Thamnophis sirtalis),bullfrog(Rana cateseiana), southern alligator lizard(Gerrhonotus multicarinatus),racer(Coluber constrictor),and gopher snake(Pituophis melaoleucus). Based on observations made during ESA's site visits,wildlife presence on the site is typical of agricultural lands of this region,with the exception of water-dependent bird species attracted to the off-site CYA detention pond and pest species (primarily gulls and crows)associated with the existing landfill. No substantial corridors or interactions between the study area and adjacent lands were observed, although the study area constitutes a portion of a larger area of agricultural lands providing foraging habitat for raptors,including the Swainson's hawk,discussed below. Additionally,due to a relative lack of vegetative cover along Little Johns Creek in the vicinity of the study area,wildlife values afforded by this feature were observed to be low(i.e.,few wildlife species were observed within this waterway during repeated site visits). Special Status Species Examination of the California Natural Diversity Database's(CNDDB)RareFind inventory provided information regarding candidate,threatened,and endangered species of plants and animals potentially occurring on the proposed project site(CDFG, 1993). Additionally, consultation with the CDFG(Schlorf, 1993;Zezulak, 1993;Bittman, 1992),CNPS (Smith and Berg, 1988),and City of Stockton(Niblock, 1993)provided information regarding CNDDB- identified species and additional special status plant and animal species,including their habitat requirements,known proximate sightings, and potential for on-site occurrence. The results of special status plant and animal species'surveys performed on the site are also summarized below. III.F.7