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Resolution Number 99-7-20-3249 RESOLUTION NO. 99-7-20-3 GEOLOGIC HAZARD ABATEMENT DISTRICTS - SETTING PUBLIC HEARING (13823/STONEFIELD SAN JUAN, LLCI A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF SAN JUAN CAPISTRANO, CALIFORNIA, DECLARING SUFFICIENCY OF PETITION, DIRECTING NOTICE TO BE MAILED TO THE PROPERTY OWNER AND SETTING A TIME AND DATE FOR PUBLIC HEARING FOR FORMATION OF A GEOLOGIC HAZARD ABATEMENT DISTRICT PURSUANT TO THE REQUIREMENTS OF PUBLIC RESOURCES CODE OF THE STATE OF CALIFORNIA, DIVISION 17 "GEOLOGIC HAZARD ABATEMENT DISTRICTS" (TRACT 13823/STONEFIELD SAN JUAN, LL.) WHEREAS, Attachment A is a petition representing the entire real property to be included within the proposed District (PRC 26550.5); and, WHEREAS, the City Clerk of the City of San Juan Capistrano has reviewed the petition and declares it sufficient pursuant to Public Resources Code, Division 17 "Geologic Hazard Abatement Districts" (PRC 26552 and 26553); and, WHEREAS, the City Council shall set a date for public hearing and cause a notice to be mailed to the owner of the entire real property within the District (PRC 26557). NOW, THEREFORE, BE IT RESOLVED, that the City Council ofthe City of San Juan Capistrano does hereby direct and declare as follows: 1. This resolution is made pursuant to Public Resources Code, Division 17 "Geologic Hazard Abatement Districts" (PRC 26558a). 2. The City Clerk of the City of San Juan Capistrano has reviewed the petition and declares it sufficient pursuant to Public Resources Code, Division 17 "Geologic Hazard Abatement Districts" (PRC 26552 and 26553). 3. A plan of control is presented with said petition which has been reviewed and it has been determined that health, safety and welfare require formation of a Geologic Hazard Abatement District (PRC 26558b). 4. A public hearing is set for August 17, 1999, at 7:00 p.m., in the City Council Chambers, City Hall, City of San Juan Capistrano, 32400 Paseo Adelanto, San Juan Capistrano, to accept all public testimony regarding said Geologic Hazard Abatement District (PRC 26558c). -1- 250 5. The City Clerk is hereby directed to notify the owner of the entire real property included within the proposed Geologic Hazard Abatement District pursuant to Public Resources Code Sections 26561, 26562 and 26563 (PRC 26558c). PASSED, APPROVED, AND ADOPTED this 20th day of July 1999. J HN GREINER, MAYOR ATTEST: CITY CLE STATE OF CALIFORNIA ) COUNTY OF ORANGE ) ss CITY OF SAN JUAN CAPISTRANO ) I, CHERYL JOHNSON, City Clerk of the City of San Juan Capistrano, California, DO HEREBY CERTIFY that the foregoing is a true and correct copy of Resolution No. 99-7-20-3 adopted by the City Council of the City of San Juan Capistrano, California, at a regular meeting thereof held on the 20th day of July 1999, by the following vote: AYES: Council Members Jones, Swerdlin, Hart, Campbell and Mayor Greiner NOES: None ABSTAIN: None ABSENT: None (SEAL) o 6L G CHERYL JO Sdt , CITY CLERK -2- 251 _ PETITION FOR FORMATION OF GEOLOGIC HAZARD ABATEMENT DISTRICT PURSUANT TO DIVISION 17 (commencing with Section 26500) OF THE PUBLIC RESOURCES CODE OF THE STATE OF CALIFORNIA TO: THE CLERK OF THE CITY COUNCIL OF THE CITY OF SAN JUAN CAPISTRANO The undersigned owners of land within the boundaries of the district proposed in this Petition hereby request that the City Council initiate proceedings to form a Geologic Hazard Abatement District pursuant to the provisions of Division 17 of the California Public Resources Code Sections 26500 et seq. (a) This Petition is made pursuant to Division 17 of the California Public Resources Code with particular reference to Sections 26550.5, 26552 and 26553 of said Code. (b) Opposite the signature of each of the petitioners is an indication of the lot, tract and map number or other legal description sufficient to identify the signature of the petitioner as that of an owner of land within the territory proposed to be included within the proposed district. (c) Opposite the signature of each petitioner is an _ indication of the date on which said petitioner's signature was affixed to this Petition. (d) The following documents are attached to this Petition and are incorporated herein by this reference as if set forth in full in the Petition: (i) As Exhibit "A", a legal description of the boundaries of the territory proposed to be included within the proposed district; and (ii) As Exhibit "B", a "Plan of Control" prepared by John P. Franklin, Geosoils, Inc., 24890 Jefferson Avenue, Murrieta, California, an engineering geologist certified pursuant to Section 7822 of the Business and Professions Code which describes a geologic hazard (as such term is defined in Section 26507 of the California Public Resources Code), its location and area affected thereby, and a plan for the prevention, mitigation, abatement, or control thereof. This Petition is signed by the following owners of land within the territory included within the proposed district: 252 PETITION Lot, Tract and Map Number or Signature of Owner, Other Sufficient Legal Descrip- Typed or Printed Name tion of Land Owned within Date of Signature of Owner and Mailing Address Territory of Proposed District by Owner Signature All of the real property described on , 1999 1. See Schedule 1 Attached Exhibit A attached to this Petition Typed or Printed Name of Owner Stonefield San Juan, LLC. Mailing Address Stonefield San Juan, LLC. c/o Stonefield Development Attention: Robert C. Pack 23333 Avenida La Caza Coto D aza, 2679 igoa e J �/ 1999 2. Typed or Printed Name of Owner Mailing Address 1996 Sigreoure' 3. Typed or Printed Name of Owner Mailing Address 1996 Signature 4. Typed or Printed Name of Owner Mailing Address 253 SCHEDULEI STONEFIELD SAN JUAN, LLC., a California limited liability Corporation By: STONEFIELD DEVELOPMENT, a California corporation, as managing member By: Robert C. Pack, President EXHIBIT "A" LEGAL DESCRIPTION OF THE BOUNDARIES OF THE TERRITORY That certain real property located in the City of San Juan Capistrano, County of Orange, State of California, described as follows: A portion of section 5, township 8 south, range 7 west, San Bernardino Meridian, according to the official plat of said land filed in the district land office on April 12, 1875. Upon recordation of the final map, which is currently(As of June 3, 1999) in progress, said subdivision will be referred to as all of TRACT No. 13823 in the City of San Juan Capistrano, County of Orange, State of California. I N ; cr t 1 , M t y; ; y Q & Sib xy- LLI Z 2^ l 71i • t 1 , .-. — •-f. 255 ILS 256 EXHIBIT "B" PLAN OF CONTROL 257 • Geotechnical *Geologic* Environmental 24890 Jefferson Ave. • Murrieta, California 92564 • (909) 677-9651 • FAX (909) 677-9301 June 11, 1999 Stonefield Development 23333 Avenida de Caza Coto de Caza, California 92679 Attention: Mr. Art McCaul W.O. 2446 -A2 -SC Subject: Geotechnical Plan of Control, Tract No. 13823, Lots 1 through 12, City of San Juan Capistrano, County of Orange, California In accordance with your request and authorization, GeoSoils, Inc., (GSI), is pleased to present this geotechnical plan of control as part of the formation of a Geologic Hazard District, which is required by the City of San Juan Capistrano for all new development. The following geotechnical plan of control includes findings, conclusions, and recommendations provided in our referenced reports (see the Appendix). GEOTECHNICAL PLAN OF CONTROL Site Description and Geologic Hazard The proposed development site, Tract No. 13823, Lots 1 through 12, in the City of San Juan Capistrano, is located within a large regional area known to contain geologic hazards. Topographically, the area is characterized by a series of relatively steep natural slopes and canyon areas. The geologic unit which underlies the site is the late Miocene to early Pliocene -aged Capistrano Formation. Geologic hazards known to exist in this general area include ancient landslides (located on Lot 13, to the east of the site), surficial slide debris, thick deposits of compressible alluvium in canyon bottoms, and compressible colluvial soil on natural slope areas. In addition, although not located onsite, a series of inactive faults have been mapped throughout the regional vicinity. In general, the Capistrano Formation consists of siltstones and claystones, which may prone to slope instability when exposed on a slope face. These soils are generally highly expansive, contain high amounts of soluble sulfates (potential corrosion to concrete), and a severe corrosivity to exposed metals. In addition, depth to groundwater is shallow on the lower elevations on the western and northern portions of the site. If not adequately addressed, these characteristics of the onsite soils have the potential for causing distress to improvements constructed at the proposed development site. 258 Prior to development of Tract 13823, Lots 1 through 12, several geotechnical investigations were performed in accordance with the prevailing principles and standards of care for the geotechnical profession in southern California and the guidelines of the City of San Juan Capistrano. These investigations identified geologic hazards on the site and provided recommendations for the mitigation of known geotechnical hazards. Site mitigation during development will include removal and recompaction of compressible soils, complete removal of surficial slide debris, installation of subdrains to minimize the accumulation of groundwater in removal areas, possible use of dewatering techniques during removals, and control of surface runoff. Stabilization of proposed cut slopes using stabilization fills or buttresses may be recommended during development at the site if adverse conditions are encountered. Other geologic hazards may arise at the site, in part, related to the plan of development. Infilling of the canyon areas creates a potential for settlements of fill. In addition, areas of varying fill thickness and subsurface conditions may be prone to differential settlement. Recommended mitigation for fill settlement include installation of subdrains for the removal of groundwater, and the installation and monitoring of settlement monuments to form an opinion regarding the settlement trends of the onsite soils and determine any waiting period prior to safe construction. Structures planned at the site should be designed to accommodate some degree of differential settlement in accordance with building code stipulations and the recommendations of the geotechnical engineer. As previously mentioned, onsite soils may be very highly expansive. Expansive soils such as those present at the site frequently exhibit certain behavioral patterns that may result in distress to structures and improvements, unless properly designed for. Such soils typically undergo irregular expansion and shrinkage in volume due to the introduction of water (as from irrigation and/or periodic rainfall) or extraction of water (during dry periods), respectively. Additionally, these soils are prone to some degree of slope creep when exposed in and/or near a slope face. Various mitigative measures have been recommended in the soils reports pertaining to the subject development, in order to minimize the effects of irregular expansion and shrinkage and possible slope creep. These include providing relatively thicker foundation slabs with special reinforcements, presaturation of slab subgrade soils, providing adequate surface drainage during landscaping, and structural setbacks from top of slopes. These soils reports also include recommended geotechnical parameters for the project structural and civil engineers to consider in their design. The soils at the subject development site also may have a high soluble sulfate content, and have the potential for causing temporal deterioration of conventional concrete due to chemical action. The soils, also, are severely corrosive to exposed metals. A qualified corrosion engineer should be consulted for concrete and exposed metals utilized during construction at the site. Stonefield Development Trac: No. 1823, Lots 1 thcugh 12 Fie: e: ,wp72400\2446a2.gpo GeOSOils, Inc. W.O. 2446 -A2 -SC June 11, 1999 Page 2 259 A detailed discussion of the geologic hazards that may impact the site are presented in the geotechnical reports for the project. These reports are on file and available for review at the City of San Juan Capistrano. Geologic Hazard Potential The City of San Juan Capistrano has recognized that various geologic hazards are present in and around the area that may impact the subject development. The City has reviewed and approved the geotechnical reports that address these concerns and provide relevant recommendations. The City has also recognized that the recommended mitigative measures are based on the current level of technology and standards of care and that these recommendations, while intended to reduce the potential for future geotechnical concerns, cannot eliminate all future risk. Recognizing that there will always be a potential for occurrence of a geologic hazard, the City has requested that a hazard abatement district be established to address and mitigate any future problems that may occur at the site. Plan for Control In the event of occurrence of a geologic hazard, a plan for control and mitigation of the condition is to be established. Because all known geologic hazards will be mitigated in accordance with current standards during construction, the hazards which may require future mitigation or control are unknown. Therefore, in the event a geologic hazard is identified, a qualified geotechnical consultant approved by the City will be retained to develop a plan of control appropriate for the identified hazard. This plan of control should describe in detail the particular geologic hazards, their location and affected area and provide a plan for prevention, mitigation, abatement and control of these hazards. Potential techniques in this regard include identification and monitoring of slide areas, slide removal or recompaction, the construction of debris basins, benches, retaining walls and other buttressing devices, etc. Stonefield Development W.O. 244&A2 -SC Tract No. 13823. lots 1 though 12 June 11, 1999 File: enwpT24W244W.gpo Page 3 GeoSoils, Inc. 260 We appreciate this opportunity to be of continued service on this project. If you have any _ questions, please call us at (760) 438-3155- Respecfully submitted, OPS `r GeoSoils, Inc. FCf /V NO -1940 Cori Jo 4n lin `A E y sccy+ct Engineering Geologist, 6 r Cit DG/JPF/DWS/kl Enclosure: Appendix - References Distribution: (2) Addressee U RCE 47857 Exp, CNtt_ David W. Skegy 9lF pf C I Civil Engineer, RCE 47857 Stonefiald Development W.O. 24an-A2-SC Trate Nc. 13823 Lots ' trough 12 June 11, 1999 File: e we 7`240'2446a2.:p3 Page 4 GeoSoils, Inc. 261 APPENDIX REFERENCE GeoSoils, Inc., 1999, Supplemental geotechnical investiigation/response to third -party geotechnical review, tract 13823, San Juan Capistrano, Califomia, W.O.244FrA1- SC, dated February 22. 1998, Update geotechnical evaluation, vesting tentative tract 13823, San Juan Capistrano, Orange County, California, W.O. 24 -4.&A -SC, dated May 13. 1992, Preliminary geotechnical study, vesting tentative tract 13823, city of San Juan Capistrano, Califomia- W.O. 1270 -SD, dated April 7. Hetherington Engineering, Inc., 1999, Respconse No. 2 to latest third -parry geotechnical review, W.O. 2445 -A2 -SC, dated May 17. GeoSoils, Inc.