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5.Altemaltws — that cross the site in two different areas. Hydrology impacts would be increased with the off-site — alternative if the creeks were to be mined out as in the project Mining Plan Option 2. This would result in a significant impact of altering the natural hydrology of these creeks,the same as the project,Mining Option 2. Otherwise, the creeks would be avoided by providing a 100-foot buffer as in the project Mining Plan Option 1. All other hydrology and water quality impacts and the mitigation measures provided in Section 4.8, such as groundwater seepage in the mining excavations causing evaporation loss and threatening groundwater quality,potential spills of hazardous materials reaching the groundwater,potential for contaminants to enter the groundwater if excavation disturbs and/or truncates the existing groundwater well shafts,and groundwater extraction that could lower groundwater levels in areas beyond the site would be similar to the project Impacts to groundwater quality from contaminants entering disturbed/truncated wells could be greater since it is assumed that with additional residential uses — surrounding the site,there are more wells in the area. Biological Resources The off-site alternative contains similar features as the project, such as agricultural crop land, creek beds,and rural residential structures.The potential to impact wetlands and special status species exists at this site. However,a biologist would need to perform a preliminary review of the off-site alternative to determine the potential for wetlands and special-status species at the site. The off-site alternative is located entirely within San Joaquin County, so for this alternative, the _ applicant would be able to comply with the SJMSCP as set forth in Mitigation Measures 4.9.2a-d. Complying with the SJMSCP would provide for pre-construction surveys, impact avoidance and minimization measures, and preservation of open space as mitigation. Biological impacts associated with development at this site would be similar or could be greater, depending on the outcome of the necessary surveys,than those associated with the project. Cultural Resources No cultural resources were found at the project site. It is unknown if cultural resources exist at the off-site alternative,but it is likely that since the area has been highly disturbed from agricultural — activities, no surface resources exist. If this alternative is chosen,a cultural resources record search and survey would need to be completed.The potential to uncover unidentified buried — archaeological remains or human remains would be similar to or could be greater than that of the project site,depending on the outcome of the necessary survey. Mitigation identified for the project would be applicable under this scenario. — Hazards and Hazardous Materials The off-site alternative contains similar features as the project, such as agricultural crop land, creek beds,and rural residential structures. Therefore, it can be assumed that the types of hazardous materials that might exist at the off-site alternative would be similar to those of the — project. An assessment of the off-site alternative would need to be completed to determine if any hazardous materials or contamination exist on the site or if there is a potential for contamination at the site from any off-site sources in the area. Hazards and hazardous materials impacts — RMC Pacific Vernalis Quarry Mining and Reclamation Project 5-18 ESA/203015 Draft Environmental Impact Report May 2006