25C - AGMT - OCWD CENTENNIAL PARK

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Section 5 The resulting water level change, or mound in the Onnicron/Upper Rho aquifer (Layer 9), was contoured and is shown in Figure 19. The results show that after 12 months of constant mid-basin injection, groundwater mounding directly at the injection wells would be approximately 16 feet. The mounding would decrease to 4 feet at approximately 2 miles from the injection wells and would decrease to 2 feet approximately 4 miles from the injection wells. Identification of Possible Contaminant Plumes in Proximity to Mid-Basin Injection Project Area The proposed mid-basin injection wells are located within portions of Centennial Park. A record search and site reconnaissance of the project site and adjoining properties was conducted to identify if there would be potential environmental concerns within the vicinity of the proposed injection Wells The Centennial Park property was listed by DISC as a proposed school investigation site subject to an investigation in 2001, due to past usage as agricultural land (row crops). DTSC subsequently determined that there were not any environmental concerns and that no further action was required at the site after a Preliminary Endangerment Assessment was completed in 2002. The site was subsequently developed as Godinez High School. The following research was conducted to identify possible groundwater contamination in proximity to Centennial Park. Reviewed Phase I Environmental Site Assessment report, which includes regulatory records reviewed to identify sites within one mile of the subject property for possible hazardous waste releases or other clocurnented environmental concerns. Identified wells, that have been sampled for water quality analyses within two miles of the subject property, and conducted an OCWD Water Resources Management System (WRMS) database query for contaminants present in those wells. Mid Basin Centennial Park Project Final EIR 5-119