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Impact 3 - Availability of Groundwater The construction of buildings, roadways and parking areas would reduce the total ground surface area available for rainfall and runoff infiltration for replenishment of the groundwater reservoir. However, the total amount of paved and constructed impervious surface area repre- sents such a small fraction of the total surface area available for ' groundwater infiltration that, by itself, the project would not represent . a significant adverse impact on the replenishment of groundwater in the area. Furthermore, the proposed unlined retention pond on-site should contribute to the replenishment of groundwater in the area. The proposed project would require the extraction of groundwater for use by employees, for irrigation of proposed landscaping, and for fire flow purposes. The amount of groundwater needed for the project would not contribute significantly to the overdraft situation in the project area. In addition, the water use for the project would be significantly less than current water requirements for irrigation. Mitigation Measures. None would be needed because impacts to the availability of groundwater are not significant. Water quality impacts to groundwater are addressed in Impact 4 - Water Quality. Impact 4 - Water Quality The presence of some clay in the soil may limit the capacity for septic system uses which could cause a deterioration of shallow groundwa- ter quality in the project vicinity if the septic system is not properly designed. If the system is designed to meet any limitations presented by the area soils, water quality impacts would not be significant. The potential exists for groundwater contamination and water quality deterioration from spillage of oil and other materials and the leaching of materials from the biomass piles. The concrete containment proposed by the applicant for the waste oil recovery area should substan- tially reduce the potential for contamination of groundwater. The biomass piles would not be in a paved or covered area. Therefore, the potential exists for contamination due to leaching. 3-43 101-45.R4 4/10/89