SU0014674 - Laserfiche WebLink

Home Browse Search

MOUNTAIN HOUSE NEIGHBORHOOD"F"PROJECT INITIAL STUDY K. HAZARDS This section of the Initial Study generally addresses the potential for hazardous materials to be present at the project site, on-site gas transmission lines, and safety issues related to the Byron Airport located 5 miles west of the project site. The applicant completed a Geological and Environmental Hazards Assessment Report(referred to as the "School Hazards Report" below)in September 1997 that addressed the site of the proposed Bethany Elementary School (Condor Earth Technologies, Inc. 1997). The conclusion of this report was that there existed the potential for soil contamination resulting from diesel-fuel spills in the vicinity of an aboveground tank In soil samples taken, toluene was detected at 0.032 mg/kg. Recommendations of the School Hazards Report included removal and proper disposal of the petroleum-stained surface soil and implementation of the seismic design and expansive soil considerations found in the 1997 Geotechnical Report. In May, 2000, a Preliminary Endangerment Assessment(PEA)was undertaken to determine the potential impacts of this soil contamination and to include recommendations for remediation. This analysis concluded that no significant levels of pesticides or other hazardous materials were located at the school site(Condor Earth Technologies, 2000). In addition to the above, Condor Earth Technologies responded to specific Mountain House Master Plan/Specific Plan 1 Environmental Program Requirements in September 1998 and this material was submitted with the Tentative Map application material. The scope of work for this work included the following: 1) Mapping of Pipelines: One natural gas pipeline and several irrigation pipelines are located on the site. In a letter to Jim Leonard of the Mountain House CSD dated June 15, 1999, the firm of Precision Planning stated that this 8-inch gas transmission line would be converted to a distribution line north of the regulator station once this station is installed and tied in. It is proposed that the line remain in place until the installation of the joint trench within Phase I construction. At that point, the old line would be abandoned. The future distribution line is proposed to be routed through the arterial streets within the joint trench. The detailed relocation plan is illustrated on a large map prepared by Precision Planning, dated June 1999. The arterials along which it would be located include Byron Road and DeAnza Boulevard. Two future phases of realignment would occur for future development phases not associated with this project. A study regarding the on-site irrigation pipelines concluded that Gate 22 of the irrigation system would require relocation, that some of the pipeline system would require capping, and Canal 70 siphon would need to be extended. Other hydrologic improvements are discussed in Section J of this Initial Study. 2) Abandoned Gas Wells: No gas wells, existing or abandoned, exist on or within 500 feet of the project site. C:VOBSWCUNMAL MVDYTWAL)NrnAL=Y-PARn.DOC(720100) 101 V.K.HAZARDS