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mitigated by "Waste Discharge Requirements" and Conditions of <br /> Approval as imposed by the California Regional Water Quality <br /> Control Board. <br /> 1.4 .4 Biological Resources <br /> A potential exists that the proposed project expansion will have an <br /> adverse impact upon wildlife, wildlife habitat and vegetation. <br /> Potentially significant adverse environmental impacts discussed in <br /> the Biological Resources Report include: <br /> Potential adverse impact from excavation and quarrying <br /> operations to the existing watercourse and wetland which flows <br /> westerly through the central portion of the lease holding. <br /> Three sensitive plant species with special status identified <br /> by the California Native Plant Society as occurring in San <br /> Joaquin County do not typically flower until late spring or <br /> late summer. The presence or absence of these species at the <br /> site is unknown at this time. <br /> 1) Delta button celery (Eryngium racemosum) , a state-listed <br /> endangered species and a candidate for federal listing, <br /> which grows in seasonally innundated areas below 100 foot <br /> elevation. <br /> 2) Greens tuctoria (Tuctoria greenei) , a state-listed rare <br /> species and a candidate for federal listing, grows in <br /> vernal pools. <br /> n 3) Ahart's dwarf rush (Juncus leiospermus var. Ahartii) , a <br />■i candidate for federal listing, grows in seasonally wet <br /> areas. <br /> Some areas in the southeastern portion of the site exhibit a <br /> prevalence of wetland plants, hydric soils and wetlands <br /> hydrology, and are potentially subject to the U.S. Army Corps <br /> of Engineers jurisdiction pursuant to Section 404 of the Clean <br /> Water Act (33 USC 1344) . <br /> Vernal pools have been identified in the far southeastern <br /> portion of the project site, and are shown on the map included <br /> in the Biological Resources Report. <br /> Suitable habitat for the California tiger salamander, a <br /> California species of special concern and a federal category <br /> 2 candidate, is present on the project site. No California <br /> tiger salamander were observed on the project site during <br /> surveys in February 1991. However, surveys were conducted <br /> during drought conditions when adults would not be active. <br /> These impacts will be minimized to a level of insignificance or <br /> avoided by specific mitigation measures including: <br /> 4 <br /> CONDOR <br />