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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures _ Development Department Biological Resources species (e.g.,coyote,badger,red fox,or ground squirrel)that otherwise has appropriate characteristics for kit fox use. ■ Known den: Any existing natural den or manmade structure that is used or has been used at any time in the past by a San Joaquin kit fox. Evidence of use may include historical records;past or current radiotelemetry or spotlighting data;kit fox signs, such as tracks, scat, — and/or prey remains; or other reasonable proof that a given den is being or has been used by a kit fox. ■ Natal or pupping den: Any den used by kit foxes to whelp and/or rear their pups. Natal/pupping dens may be larger with more numerous entrances than dens occupied exclusively by adults. These dens typically have more kit fox tracks,scat,and prey remains in the — vicinity of the den and may have a broader apron of matted dirt and/or vegetation at one or more entrances. A natal den,defined as a den in which kit fox pups are actually whelped but not necessarily — reared,is a more restrictive version of the pupping den. In practice, however,it is difficult to distinguish between the two;therefore, for purposes of this category,either type of den qualifies. ■ Atypical den: Any manmade structure that has been or is being occupied by a San Joaquin kit fox. Atypical dens may include pipes, culverts, and diggings beneath concrete slabs and buildings. - Written results of the surveys must be received by USFWS within 5 days after the completion of the preconstruction surveys and prior to the beginning of ground-disturbance and/or construction activities likely to affect San Joaquin kit fox. The project proponent shall implement Mitigation Measure BIO-3d for each habitat feature that is found during the preconstruction survey. Mitigation Measure BIO-3d: Avoid San Joaquin Kit Fox Dens _ by Establishing and Observing Exclusion Zones After preconstruction den searches and before the commencement of construction activities,DeSilva Gates or its contractor shall work with the wildlife biologist to establish and maintain the following exclusion zones measured in a radius outward from the entrance or cluster of entrances of each den. ■ Potential and atypical dens: A total of 4-5 flagged stakes shall be placed 50 feet from the den entrance(s)to identify the den location. ■ Known den: Orange construction barrier fencing shall be installed between the construction work area and the known den site at a minimum distance of 100 feet from the den. The fencing shall be maintained until all construction-related disturbances have been terminated. At that time, all fencing shall be removed to avoid attracting subsequent attention to the den. DeSilva Gates Quarry Project — Draft Environmental Impact Report 3.D-18 J&S 05105.5