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083 Santiago Creek, the potential for significant impacts to water quality still exists. Similar to the proposed project, construction emissions for Phase I Only have the potential to exceed PM~0 levels and result in a temporary significant impact. With Phase I Only, no traffic signal would be required at the project driveway on Main Street. This would result in greater site access and circulation impacts than the full buildout of proposed project due to greater restricted turning movements than with a signal. Bus parking would still be provided offsite for this alternative. Offsite parking impacts would be similar to the proposed project as overflow automobile parking from special events may still occur at adjacent commercial properties. Long-term parking impacts would be greater as no parking structure would be constructed with this alternative. Noise impacts would be less than the proposed project as the potential use of pile drivers for Phase II bridge and parking structure construction would not occur. Construction activities for Phase I would still, however, have the potential to result in temporary significant, but intermittent, noise impacts. Similar to the proposed project, potentially significant operational-noise impacts associated with Phase I project operations remain with this alternative, as the cube structure would still be subject to high noise due to its location near the freeway and its open-structure design. Patrons observing the displays in the cube would be subjected to noise levels from the I-5 freeway which exceed noise criteria standards. Additionally, the proposed parking area currently exceeds noise thresholds as the lot is located adjacent to the I-5 and construction ora soundwall would still be required for this alternative. Due to the configuration of the existing overhead ramp which reflects sound from its bottom surface, the effectiveness of a soundwall would be reduced, and it is unlikely it would provide the 10 dB of noise reduction needed to reduce traffic noise to below 65 dB-CNEL; this impacts would remain significant and unavoidable. Impacts related to the use of small quantities of ba?ardous materials for teaching purposes are similar to the proposed project. However, impacts related to the jet fuel line would be less than the proposed project because no relocation would be necessary to accommodate the parking structure. Site security impacts resulting from the lack of visibility to the parking area would be the same for the Phase I parking lot, but would be eliminated for the parking structure proposed in Phase II. As Santiago Creek is often used as an access corridor for criminal activity and high transient populations, theft rates are associated with the Santiago Creek area and a potential exists for thefts and other criminal activity to take place. Fencing will be provided at a later date, if it is determined necessary for site security. Electricity impacts for this alternative would be the same as for the proposed Project. The provisions for underground cables to the site would require excavation, potentially disrupting traffic and circulation in the project vicinity resulting in temporary significant impacts. Potential impacts to cultural resources would be less than the proposed project as the 1.95-acre remnant parcel will remain undisturbed. Recreational impacts may be less than the proposed project because there may be less conflict on the bike trail between the pedestrians and bicyclists if Phase Il is not constructed as there would be tess patrons using the science center. Discovery Science Center EIR April I0, 1997 ('in' qf Santa Am~ ] 9 5tatelnent of Findings and Facts