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St. Barbara Catholic School <br />Project No.: D-6289-01 <br />Landsliding: The site is not within a zone mapped as requiring eval <br />induced landsliding potential (CGS, 2008, SP 117A). Since the site is <br />steep slopes, landsliding will be unlikely. <br />CITY OF SANTA ANA <br />Planning and Building Agency <br />may, lS. <br />Approved <br />FOR PERMIT ISSUANCE <br />of earthquake- <br />asterlD- <br />enouah from <br />Subsidence: The area is not susceptible to subsidence. Subsidence should not pose any <br />significant safety hazard to the proposed development. <br />Hydroconsolidation or soil collapse typically occurs in recently deposited, Holocene (less <br />than 10,000 years old) soils that were deposited in an and or semi -arid environment. Soils <br />prone to collapse are commonly associated with man-made fill, wind -laid sands and silts, <br />and alluvial fan and mudflow sediments deposited during flash floods. When saturated, <br />collapsible soils undergo a rearrangement of their grains, and the water removes the <br />cohesive or cementing material and settlement results. <br />Based on the consolidation test provided in our report, and non -expansive material, hydro <br />consolidation of the soils should not pose any significant safety hazard to the proposed <br />development. <br />Oil Wells and Methane Gas <br />In accordance with the online Well Finder database by the California Division of Oil, <br />Gas, and Geothermal Resources (DOGGR) the project site is not located within an oil <br />field. The closest known production wells are far away to the south and to the north as <br />shown on Plate H-2 in Appendix A (DOGGR, 2017). DOGGR categorizes these wells as <br />plugged. Although considered remote, any wells encountered during construction will <br />have to be abandoned in accordance with current DOGGR standards and regulations. <br />The project site is not located in a "High Risk" area susceptible to gaseous soils such as <br />methane as per Orange County Safety Element of the General Plan (2012). Therefore, the <br />potential for volatile gases to be encountered during construction is considered low. <br />9 <br />