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Memorandum TETRA TECH 3.0 RESULTS 3.1 Ephemeral Pond The ephemeral pond was observed in the southeast portion of the property (Figure 1 in Attachment A). The pond appeared to have recently receded, based on the presence of surface soil cracks, but standing water was still present at a depth of approximately 1 to 2 feet deep. The water was turbid and murky,and the soil was a silty clay color of 10YR 3/1. Deep soil cracks were present where the water had receded. Cattle tracks surrounded the pond;cattle were observed elsewhere within the Project property during the site visit. Two debris piles containing cut wood were observed; one is located next to the pond,and one was located in the pond (the general location is shown in Figure 1).Two species of common amphibians were observed to be inhabiting the pond and directly adjacent area,specifically: California toad (Anaxyrus boreas halophilus) and Sierran treefrog (Pseudacris sierra). No tadpoles or fairy shrimp were observed in the water. Photographs of the ephemeral pond are included in Attachment B. 3.1.1 Special-status Species The pond was evaluated for its potential to support special-status species,such as CTS,western spadefoot,and vernal pool invertebrates such as the longhorn fairy shrimp and vernal pool fairy shrimp. If water is present,the ephemeral pond has the potential to support breeding habitat for the CTS and western spadefoot.The pond would not support breeding California red-legged frog due to the lack of emergent vegetation. However, it is infrequently ponded as shown in historic aerial imagery and was not observed during previous Tetra Tech surveys in January, March,and September 2022. This pond is likely only present during high rainfall years,such as the 2022-2023 historically high rainfall year. During a review of available aerial imagery from 1937 to 2022,there was no evidence of ponding water.This pond likely only holds water seasonally during high rainfall years and is typically dry;therefore,the likelihood of longhorn fairy shrimp and vernal pool fairy shrimp presence in this pond is low. Branchiopod cysts can persist in soil substrate for decades, but generally require recurring ponding to continue their lifecycle. The EIR will include an analysis of the Project's potential impacts to CTS,western spadefoot, California red-legged frog,and vernal pool invertebrates. Measures will be proposed to mitigate Project impacts.Although the ephemeral pond is outside of the Project footprint, it is approximately 40 feet away from the Project footprint boundary and has the potential to be impacted by indirect effects. 3.1.2 Jurisdictional Delineation The pond was evaluated for hydrophytic vegetation, hydric soils,and wetland hydrology per the Interim Regional Supplement to the Corps of Engineering Wetland Delineation Manual:Arid West Region (U.S.Army Corps of Engineers[USACE] 2008), a supplement to the Corps of Engineers Wetland Delineation Manual(Environmental Laboratory 1987),to determine the presence or absence of wetlands and Waters of the U.S.that are potentially subject to regulation under Section 404 of the Clean Water Act.This delineation methodology was also used to evaluate potential Waters of the State under Regional Water Quality Control Board (RWQCB)jurisdiction. "Waters of the State"are 2 J u ly 2023