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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 47 h. All federally or state-listed species observed will be allowed to leave the Impact Area on their own. If the biologist determines that continuing activities could potentially cause unpermitted take under federal or State law to a federally or state-listed species, activities must cease. Work may not resume until the on-site biologist has determined there is no longer the possibility of causing unpermitted take under federal and State law. i. The area below any vehicle or piece of equipment that has been stationary for 24 hours or greater will be examined prior to operation to ensure that no wildlife species is present. j. No pets or firearms will be permitted on site. k. Any open holes or trenches that will be left exposed overnight will either be securely covered or have an escape ramp installed to prevent entrapment of any wildlife. l. Any piping or casing left exposed overnight will be capped to prevent wildlife from entering. MM BIO-2: Special-Status Reptiles and Amphibians a. No project activities will be conducted during or within 24 hours following a rain event in locations that have a potential for special status amphibians to occur or are near wetlands or other water features. b. In areas with the potential for special-status reptiles and amphibians to occur, prior to the onset of project activities at any Impact Area, a qualified biologist will conduct pre-activity surveys to determine whether any such species are present. A qualified biologist must, at a minimum, have experience conducting surveys to identify the California tiger salamander, California red- legged frog, western spadefoot, western pond turtle, and/or giant garter snake and their associated habitat. c. Any active rodent burrows or suitable cracks identified by a qualified biologist during the pre-activity survey will be flagged so that they can be avoided. d. Any burrows, cracks or fissures suitable for rodents that cannot be avoided, and will be temporarily impacted by the movement and placement of equipment or other project activities will be covered with plywood to avoid burrow collapse. e. Leaf litter will be surveyed by the biologist for presence of wildlife prior to the onset of work, and if any special-status species are identified as using the leaf litter for refuge it will be avoided and a buffer will be established by a qualified biologist and flagged.