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MONK &ASSOCIATES Biological Resources, Impacts and Mitigations -_ Tracy Facility Expansion Site In addition g' n to the mitigation requirements established by US FWS in their letter to San Joaquin County as presented above, during the December 1993 meeting with CDFG and USFWS, these agencies determined that any area of the project site that flooded during 100=year storm.events in Corral Hollow Creek, as a direct result of the mining project,would be considered permanently impacted. It was reasoned that flooded areas do not constitute habitat that kit fox could reasonably be expected to occupy. The total project site(137 acres)would be mined over a six-year period and then reclaim ed: ite reclamation would include recontouring the mined area, Upon cessation of mining activities, s and planting an annual grassland forb/grass mix in a tackified hydromulch application. The site perpetuity as rangeland(pasture land). It would be preserved via a d then be managed in peep ty wool . i conservation easement,or in the event that no suitable conservators are found for the conservation easement,in a Grant of Easement. The conservation easement or a Grant of Easement would be developed mutually with CDFG/USFWS, and would essentially remain with those management conditions established for offsite Habitat Management Lands. consistent g Reclamation of the mined site would include leaving the constructed berm south of Corral R us set-back of the mined project site. [ Hollow Creek to protect the southernmost 97.65 acres (plus ) In addition, the preserved north bank of Corral Hollow Creek would provide permanent protection for the northernmost 24.16 acres of the site. 'In all, 110.93 acres would be mined and would remain protected from flooding in Corral Hollow Creek during l 00-year storm events. In es of erimeter setback areas would remain free of flooding. addition, the 10.88 acre p 9 There would continue to be flooding impacts to.10.58 acres of habitat permanently enclosed within the Corral Hollow Creek protection corridor by the southern berm. These 10.58 acres in addition to the 4.4-acre streambed would be subject to flooding from 100-year storm events (total 14.98 acres). However,�as Figure 6 shows,the 10.58-acre set aside area plus the 4;4-acre stream channel are now normally subjected to inundation/flooding from 10Q-year storm events. Thus, since the Corral Hollow Creek protection corridor would not be mined,mitigation for flooding in this area should not be required. Consequently, the total kit fox mitigation requirement should be 133.99 acres of Habitat.Management Lands. This mitigation acreage .requirement is calculated as follows: Since 121.81 acres would be impacted and restored in a 6 year period, and would constitute temporary impacts,these impacts would be compensated for by multiplying 121.81 acres by 1.1,or 133.99 acres of kit fox Habitat Management Landswould need to be provided for temporary impacts to kit fox habitat from the proposed mining project. Granite proposes to use the entire reclaimed project site as partial compensation for impacts to kit fox habitat. Granite would receive 50 percent credit for the 136:79-acre project site. While Granite would be dedicating the entire 136.79-acre project site in perpetuity as kit fox preserve, Granite would only receive 68.40 acres of credit to meet the overall mitigation requirement of 133.99 acres of Habitat Management Lands• An offsite mitigation parcel would have to be purchased to meet the remaining 49 percent mitigation requirement. activities, the Prior to commencing with raining applicant would also enlist the services of a qualified biologist to conduct kit fox pre-mining surveys over the area that would be impacted by the expansion project in that particular year. Each year,pre-mining surveys would be conducted 38