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HomeMy WebLinkAboutCT 01-02; CALAVERA HILLS VILLAGE K; UPDATE OF GEOTECHNICAL REPORT; 1999-10-20- UPDATE OF GEOTECHNICAL REPORT 1 CALAVERA HILLS, VILLAGE K CITY OF CARLSBAD, CALIFORNIA . - - .. .... . Geotechnical • Geologic.. Environmental I 1 I 1 I. I H : UPDATE OFGEOTECHNICAL REPORT: I CALAVERA HILLS, VILLAGE K - CITY OF CARLSBAD, CALIFORNIA I FOR , -- CALAVERA HILLS II, LLC I 2727 HOOVER AVENUE NATIONAL CITY, CALIFORNIA 91950 I WO. 2747-A-SC OCTOBER 20, 1999 I 1 1 I I I I I 1 0 I Geotechnical 'Geologic. Environmental I ,.5741 Palmer Way • Carlsbad, California 92008 • (760) 438-3155 • FAX .(760)931-0915 - . October 20, 1999 I W.0. 2747-A-SC Calavera Hills II, LLC 2727 Hoover Avenue National City, California 91950: •. I Attention Mr. Thom Fuller .I Subject: Update otGeotechnical Report, .Calavera Hulls, Village k, City of Carlsbad, California u Gentlemen:.,. . . In accordance with your request, GeoSoils, Inc (GSI) has performed a geotechnical U . update evaluation of the subject site. The purpose of the study was to evaluate the onsite soils and geologic conditions and their effects on the proposed site development from a geotechnical viewpoint. Unless specifically superceded in the text of:this report, I recommendationspresented in .the referenced reports (see Appendix A) are considered valid and applicable. SCOPE OF SERVICES . .• . The scope of our services has included the following Review of the referenced reports. Geologic site reconnaissance .. . . - . - General areal seismicity update evaluation. 1 Engineering and geologic analysis and preparation of this report I SITE CONDITIONS/PROPOSED DEVELOPMENT - A site reconnaissance; performed by a representative fromthis office on October 13, 1999, I indicated that site conditions have not substantially changed since the completion of-the referenced reports by others (see Appendix A). It-is ourunderstanding that planned site development will consist of site preparation for the construction of approximately 89 single I family residential st?uctures Based on the site plan (O'Day, 1999), grading will consist of cuts and fills on the order of 25 feet and 18 feet, respectively. Foundation loads are I anticipated to be typical for this type of relatively light construction Sewage disposal is anticipated to be tied into the regional system. Proposed development is shown on the attached Tentative Site Plan (Plates 1 and 2), prepared by O'Day Consultants. I I . EARTHWORK RECOMMENDATIONS Site grading should be performed in accordance with the minimum standards of the City I of Carlsbad, the Uniform Building Code (1997 edition) and the grading guidelines ' presented in Appendix B. Due to the anticipated rock hardness, consideration should be given to over excavating street areas to at least 12 inches below lowest utility invert I elevation in cut areas Overexcavation within parkways should also be considered with respect to utility laterals This is not a geotechnical requirement, however. I SEISMIC DESIGN PARAMETERS I .Based on the site conditions, Chapter 16 of the Uniform. Building Code (International Conference of Building Officials, 1997), the following seismic parameters are provided H HI i.. I I Seismic zone (per Figure 162*) 4 Seismic Zone Factor (per Table 161*) . 0.40 Soli Profile Type (per Table 16J*) . . SiB Seismic Coefficient Ca (per Table 16-0*) 0.40 Na Seismic Coefficient C,, (per Table 16R*) 0.40 N Near Source Factor N a (per Table 16-S*) H 1.0 Near Source Factor N,, (per Table 16T*) . 1.0 Seismic Source Type (per Table 16-U*) Distance to Seismic Source . . . 7.8ml(12.5km) Upper Bound Earthquake ___- M6.9 Figure and table references from Chapter 16 of the Uniform Building Code (1997 1 I . . Caiavera Hills Ii, LLC W.O. 2747A5C Calavera Hills, Village K . . ,. . October 20, 1999 I File: e:\wp7\2700\2747a.ugr . . . . . .. . . - . Page 2 GeoSoils, Inc. I I SLOPE STABILITY I A review of the referenced reports (SCST, 1984, 1990) indicates that cut and fill slopes are considered grossly and surficially stable. However, due to the sometimes random nature of fractures in this type of bedrock, adverse conditions may be exposed during grading I . Such conditions, if present, should be evaluated by the geotechnical consultant as soon as they are exposed and the appropriate recommendations should be provided. Such an evaluation may consist of a formal slope stability analysis Possible remedial I recommendations may include, but not necessarily limited to buttress fills, stbility fills, rock netting, and rock bolting FOUNDATION RECOMMENDATIONS I General I The foundation design and, construction recommendations presented herein are preliminary in nature and will be finalized at the completion of grading..Recommendations for conventional foundation systems are provided in the following sections. The foundation I systems may be used to support the proposed structures, provided they are, founded in competent bearing material and should be designed and Oonstructéd in accordance with the guidelines contained in. the Uniform Building Code. All footing designs should be I .reviewed by the project structural engineer. The use of conventional and/or post tensioned slab foundations will be determined in accordance with the criteria presented in the - attached Table 1 and Table 2. I Conventional Foundation Design 1 Conventional spread and continuous footings maybe used to support the proposed residential structures provided they are founded entirely in properly compacted fill or other competent bearing material' (i.e., bedrock). Footings should. not U " simultaneously bear directly on bedrock and fill soils. Analyses indicate that an allowable bearing, value of 2000 pounds per square foot5',. may be used for design of continuous footings per Table 1, and for design of isolated pad footings 24 inches square and 18 inches deep into properly I , compacted fill or bedrock. The bearing value may be increased-by one-third for seismic or other temporary loads. This value may be increased by 20 percent'for each additional 12 inches in depth, to a maximum of 2500 pounds per square foot No increase, in bearing, for footing width is recommended For lateral sliding resistance,, a 0.4 coefficient of friction may be utilized for a 1 ' concrete' to soil contact when multiplied by the dead load. I Calavera Hills ii, LLC ' W.O. 2747-A-SC Calavera Hills, Village K . October 20, 1999 I File: e:\wp7\2700\2747a.ugr '. . ' , Page 3 GeoSoils, Inc. I 1 . . Passive earth pressure may be computed as an equivalent fluid having a density of 300 pounds per cubic foot with a maximum earth' pressure of 2500 pounds per I square foot. When combining passive pressure and frictional resistance, the passive pressure I ' component should be reduced by one-third. . Footings should maintain a horizontal 'distance or setback between any adjacent 1 slope face and the bottom outer edge of the footing. The horizontal distance may be-calculated by using h13, whe're(h) is the height of the slop. The horizontal. I setback should not be less than 7 feet, nor need not be greater than 40 feet (per code). . The setback may be maintained by simply deepening the footings. Flatwork, utilities or other improvements within a zone of h/3 from the top of slope I . maybe subject to lateral distortion. Footings, flatwork, and utilities setbacks should be constructedin accordance with distances indicated in this section, and/or the * approved plans. . . . . ' .. . Provided that the recommendations contained in this report are incorporated into final designand construction phase of development, a majority (>50 percent) of the I . anticipated foundation settlement is expected to occur during construction. Maximum settlement is not expected to exceed approximately, 1/2-IflCh and shoUld occur below the heaviest loaded columns. Differential settlement is not anticipated I to exceed ¼-inch between similar elements, in a 20 foot span: I .Conventional Foundation/Concrete Slab Construction . . . The following construction recommendations are based on generally very low to low I ' expansive bearing soils and maximum fill thicknesses of lees than approximately 50 feet. 1. conventional continuous footings should be constructed in accordance with I •' recommendations presented in Table 1, arid in accordance with Uniform Building Code guidelines (1997 ed.). All footings shoUld be reinforced per Table .1. I , 2. Detached isolated iñterior.or exterior piers and columns should be founded at a minimum depth of 18 inches below the lowest adjacent ground surface and tied to the main foundation in at least one directionwith a grade beam. Reinforcement I , . should be properly designed by the project structural engineer. 3. A grade beam: reinforced as above, and at least 12 iriches square, should be I provided across the garage entrances: The base of the reinforced grade beam should be at thesame elevation as base of the adjoining footings. . - 4 Calave'ra Hills II, LLC . . . . . . ' . W. 0. 2747-A-SC Calavera Hills, Village K October 20, 1999 I . File: e:\wp7\2700\2747a.ugr . .. . Page 4 GeoSoils, Inc. '. . . F I .•, • 'l 1. '' ' I I:.'. 1* 8. 9. The residential floor and garage slabs should have a minimum thickness of 4 inches, in accordance with Table 1. Concrete used in floor slab construötion should • have a minimum compressive strength of 2000 psi Concrete slab's should be underlain with 'a minimum of 4 inches of sand. In addition, a vapor barrier consisting of a' minimum 'of, 10-mil, polyvinyl-chloride membrane, with "all laps sealed, sh6uld be'provided at the mid-point of the sand layer. The slab subgrade shOuld be free of loose and uncompactd material prior to placing concrete. Concrete floor slabs (residence and garage) should be reinforced per Table 1. All 'slab reinforcement should, be supported to ensure 'pfoper mid-slab height positioning'during placement of the concrete. ."Hooking" of reinforcement is not an acceptable method of positioning. . .' . The moisture content of the sübgrade soils should,be equal to or greater than optimum moisture to a depth of 12 inches below the adjacent ground grade in the slab areas, and verified by this office within 72 hours of the vapor barrier placement Soils generated from footing excavations to be used 'onsite should be compacted to a minimum relative compaction 90 perdent of the laboratory standard, whether -' it is to be placed inside the foündátion perimeter orin the yard/right-0f.way areas., This material must not alter positive drainage pattern's that direct drainage away from the structural areas and toward the street. . . . As an alternaUve, an engineered post-tension foundation system may be used: Recommendations for post-tensioned slab design are presented-in the following Section. ' ' ' • Post-Tensioned Slab Foundation Systems Post-tensioned (PT) slabs may be utilized fr construction of typical one (1) and two' (2) story residential- structures onsite. The information and recommendations presented in this section are not meant to supersede design by a registered structural engineer or civil engineer' familiar with post-tensioned- slab design or , corrosion engineering consultant. - , •. ' ' ' From a soil expansion/shrinkage standpoint, a fairly common contributing factor to distress of structures using post-tensioned slabs is a signifi can t fluctuation in the moisture content of soils underlying the OeTimeter 'of the slab, compared to' the .center, causing a "dishing" or, "arching"of'the slabs. To mitigate this possible''. phenomenon, a combination of soil presaturation, (if 'necessary, 'or after the project .has been dormant for a period of time) and construction of a perimeter "cut off' wall', grade beam may be employed. , ' ' - .•• ' Caiavera Hills il,'LLC ' W.O. 2747-A-SC Calavera Hills, Village K '. . ' * • ' ' October'20, 1999 File: e:\wp7\2700\2747a,ugr . ' ' ' , ' ' 'Page 5 4 GeoSoils, Inc. I I 3. For very low to low (E.l.= 0 through 50) expansive soils, perimeter and mid span beams should be a minimum 12 inches deep below lowest adjacent pad grade; I . Perimeter beams should-be a minimum of 18 inches deep for medium expansive and 24 inches deep for'highiy expansive soil conditions. The perimeter foundations may be integrated into the slab design or independent of the slab: The perimeter beams should be a minimum of 12 inches in width. A vapor barrier should be utilized and be of sufficient thickness to provide an I , adequate separation of foundation from soils (10-mil thick). The vapor barrier should be lapped and adequately sealed to provide acontihuous water-resistant barrier under the entire slab. The vapor barrier, should be sandwiched between two I ' 2-inch thick layers of sand (SE>30) for a total of 4 inches of sand. I Isolated piers should be incorporated into the post tension slab system. 5. Specific soil presaturation for slabs is not required for very low. expansive soils; I : however, the moisture content of the subgrade soils should be at or above the soils' optimum moisture content to a minimum depth of 18, inches below grade depending on the footing embedment. I . 6. Post-tensioned slabs should be designed using sound engineering -practice and be in accordance with the Post-Tension Institute (PTI) local and/or national code I .criteria and the recommendations of a structural or civil engineer qualified in post- tension slab design. Alternatives to PTI methodology may be used if equivalent systems can be proposed which accommodate the angular distortions, expansion I parameters, and settlements noted' for this, project. If alternatives to PTI are suggested by the structural consultant, consideration should begiven for additional review, by a qualified structural PT-designer. Soil related parameters for post- tensioned slab design, are presented in Table 2. 7. Provided that the recommendations contained in this report are incorporated into final design and construction phase of development, a majority (>50 percent) of the. anticipated foundation settlement is expected to occur during construction. I Maximum settlement (preliminary estimate) is not expected to exceed approximately 1/2-inch and should occur below the heaviest loaded columns. Differential settlement is not anticipated to exceed 1/4-inch between similar elements, in a 20 I 'foot span for maximum fill thicknesses up to 30 feet. Deeper fills and/or differential fill thicknesses greater than 3:1 will be evaluated on a lot by lot basis during grading, and may result in ,more onerous design. ' Designers of PT slabs should review the parameters provided for post-tensioned slabs, and compare using a span distance of.5 feet, using a modules of subgrade 1 reaction, presented in Table 2. I Caiávera Hills Ii, LLC , ' . ' W.O. 2747-A-SC Caiavera Hills, Village K ' ' , October 20, 1999 I File: e:\wp7\2700\2747a.ugr . . ' ' . , Page 6 GéoSoits Inc. ' . . 1:..;,.. I ' 8. ' In accordance with guidelines presented in the Uniform Building Code, improvements and/or footings should maintain a horizontal distance, X, between I any adjacent descending slope face and the bottom outer edge of the improvement and/or footing. The horizontal distance, X; may be calculated by.using X = h/3, where h is the height of the slope. X should not be less than 7 feet, nor need not I .., be greater than 40 feet. X may be maintainedbydeepening the footings. Improvements constructed within a distance of h/3 from the top of slope may be I .' . subject to lateral distortion. •' ', Foundations for any adjacent structures, including retaining walls, should be I . deepened (as necessary) to below a: 1:1 'projection upward and away from any proposed lower foundation system. This recommendation may not be considered valid, if the additional surcharge imparted by the upper, foundation on. the lower I . , foündation has been' incorporated into the design of the lowerfoundation. Additional setbacks, not discussed or superseded herein, and presented in the UBC I are considered valid DEVELOPMENT CRITERIA . .Landscape Maintenance and Planting . . '. .. . ' Water has been shown to weaken the inherent strength of soil and slope stability is significantly reduced by overly wet conditions. Positive surface drainage away from graded' I slopes should be maintained and only the amount of irrigation necessary to sustain plant life should be provided for planted slopes. Overwatering should be avoided. I 'Graded slopes constructed within and utilizing onsite materials would be erosive. Eroded debris may be minimized and surlicial slope stability enhanced by establishing, and I . maintaining a suitable vegetation cover soon after, construction. Plants selected for landscaping should be light weight, deep rooted types which require little water, and are capable of surviving the prevailing climate. Compaction to the face of fill slopes would I , tend to minimize short term erosion until vegetation is established. In order to minimize erosion on a slope face, an erosion control fabric should be considered. I .From a geotechnical standpoint leaching is not recommended for establishing landscaping. If the surface soils area processed for the purpose of adding amendments I '. •. they should be recompacted to 90 percent relative, compaction. - Additional Site, Improvements I Recommendations for additional grading, "exterior concrete flatwork design' and construction, including driveways, can be provided upon request. If in the future, ahy I . Calavera Hills II, LLC . . W.O. 2747-A-SC' Calavera Hills, Village K . ' . .. October 20, 1999 I ' FiI: e:\wp7\2700\2747a.ugr . . - . . ' . . - Page 7 GeoSoils, Inc.- ' . I - additional improvements are planned for the site, recommendations concerning the geological or geotechnical aspects of design and construction of said improvements could be provided upon request. . Trenching . I All footing trench excavations for structures and walls should be observed and approved by a representative of this office prior to placing reinforcement: Footing trench spoil and I any excess soils generated from utility trench excavations should. be compacted to a minimum relative compaction of 90 percent if not removed from the site. All excavations should be observed by one of our representatives and conform to CAL-OSHA and local 1 safety codes. GSI does not consult in the, area of safety engineers. In addition, the potential for encountering hard spots during footing and utility trench. excavations should be anticipated. If these ..concretions are encountered within the ' proposed footing trench, they should be removed, which could produce larger excavated I-.. . areas within the footing or utility trenches. . .'. . . Drainage . . I Positive site drainage should be maintained at all times. Drainage should not flow uncontrolled down any .descending slope. Water should be directed away from I . foundations and not allowed to pond and/or seep into the ground. .Pad drainage should be directed toward the street or other approved area. Roof gutters and down spouts should be considered to control roof drainage. Down spouts should outlet a minimum of I . . 5 feet from the proposed structure or into a subsurface drainage system. We would recommend that any proposed open bottom planters adjacent to proposed structures be eliminated for a minimum distance of .10 feet. As an alternative, closed bottom type I planters could be utilized. An outlet placed in the bottom of the planter, could be installed to direct drainage away from structures or any exterior concrete flatwork. I PLAN REVIEW I Final site development and foundation plans should be submitted to this office for review and comment, as the plans become available, for the purpose of minimizing any.. I .misunderstandings between the plans and recommendations presented herein. In addition, foUndation excavations and any additional earthwork construction performed on the site should be observed and tested by this office. If conditions are found to differ I . substantiallyfrom those stated, appropriate recommendations would be offered at that time. I I Calavera Hills II, LLC . . . W.O. 2747-A-SC Calavera Hills, Village K . . October 20, 1999 I File: e:\wp7\2700\2747a.ugr . . . . . ' Page 8 . GeoSoils, Inc. ,. , 1 LIMITATIONS I .The materials observed on the project site, and the, referenced reports reviewed are believed to be generally representative of the area; however, soil and bedrock materials vary in character between excavations and natural outcrops or conditions exposed during I .mass grading.. Site conditions may vary due..to seasonal changes or other factors. GSI assumes no responsibility or liability for work,' testing or recommendations performed or' provided by others. The scope of work 'was performed within the limits of a budget. I ' . Inasmuch as our study is based upon the site materials observed, selective laborétory testing and engineering analysis,, the conclusion and recommendations are professional I , opinions. These opinions have been derived 'in accordance with current standards of practice, and no warranty is expressed or implied. Standards of practice are subject to change with time. The opportunity to, be of service is sincerely appreciated. If you should have any questions, please do not hesitate to contact the undersigned at (760) 438-3155......... I . Respectfully submitted, GeoSoils, Inc. No. 11934NIOA David W. Skelly ' ow 9 Engineering Geologist, CEG j93EP ) Civil Engineer RCE PCE 47!57\\ RGC/DWS/JPF/mo I Attachments: Tabl 1 - Conventional Foundation Recomendation ' Table 2 - Post Tensioned Foundation, Recommendations ' , •' ' Appendix A'-'References Appendix B - General Earthwork and Grading Guidelines I Plates 1 and 2 - Geologic Maps Distribution: (4) Addressee 'Caiavera Hills Ii, LLC W.G. 2747-A-Sc calavera Hills, Village K . '' . . October 20, 1999 I . File: e:\wp7\2700\2747a.ugr ' Page 9 GeoSoils, Inc. - - - - - - - - - - - - M. TABLE 1 Conventional Perimeter Footings, Slabs, and Exterior Flatwork for Calavcra Hills. Villaae K FOUNDATION MINIMUM INTERIOR REINFORCING INTERIOR SLAB UNDER-SLAB GARAGE SLAB EXTERIOR CATEGORY FOOTING SLAB STEEL REINFORCEMENT TREATMENT REINFORCEMENT FLATWORK SIZE IN REINFORCING I 12" Wide 4 "Thick 1- #4 Bar Top #3 Bars 2" Sand Over 10- 6" x 6" none x and Bottom @ Mil Polyvinyl (10/10) 12" Deep 24" o.c. Membrane Over WWF Both Directions 2" Sand Base II 12" Wide 4 "Thick 2- #4 Bars Top #3 Bars 2" Sand Over 10- 6" x 6" 6" x 6" x and Bottom @ MU Polyvinyl (6/6) (10/10). 18" Deep 18" o.c. Membrane Over WWF WWF Both Directions 2" Sand Base III 12" Wide 4" Thick 2- #5 Bars lop #3 Bars 2" Sand Over 10- Same as 6" x 6" • x and Bottom @ Mil Polyvinyl Interior Slab (6/6) 24" Deep 18" o.c. Membrane Over WWF Both Directions 2" Sand Base Category Criteria Category I: Max. Fill Thickness is less than 20 and Expansion Index is less than or equal to 50 and Differential Fill Thickness is. less than 10 (see note 1). Category II: Max. Fill Thickness is less than 50 and Expansion Index is less than or equal to 90 or Differential Fill Thickness is between 10 and 20 (see note 1). Category Ill: Max. Fill Thickness exceeds 50', or Expansion Index exceeds 90 but is less than 130, or Differential Fill Thickness exceeds 20 (see note 1). Notes: 1. Post tension (PT) foundations are required where maximum fill exceeds 50', or the ratio of the maximum fill thickness to the minimum fill thickness exceeds 3:1. Consideration should be given to using post tension foundations where the expansion index exceeds 90. Footing depth measured from lowest adjacent subgrade. Allowable soil bearing pressure is 2,000 PSF. Concrete for slabs and footings shall have a minimum compressive strength of 2,000 PSI (2,500 PSI for exterior flatwork), or adopted UBC mm., at 28 clays, using 5 sacks of cement. Maximum Slump shall be 5". Visqueen vapor barrier not required under garage slab. However, consideration should be given to future uses of the slab area, such as room conversion and/or storage of moisture-sensitive materials. Isolated footings shall be connected to foundations per soils engineer's recommendations (see report). Sand used for base under slabs shall be very low expansive, and have SE > 30. Additional exterior flatwork recommendations are presented in the text of this report. All slabs should be provided with weakened plane joints to control cracking. Joint spacing should be in accordance with correct industry standards and reviewed by the project structural engineer. TABLE 2 PRELIMINARY POST TENSION SLAB FOUNDATION RECOMMENDATIONS I Expansion Index Foundation Category I (PT) Very Low to Low (0-50) II(PT) Medi um (51-90) III (PT) High (>90) Perimeter footing embedment 12 18" (w/premoistening) (24 (w/premoistening) Allowable bearing value 1200 psf* 1200 psf* 1200 psf* Modulus of subgrade reaction 100 pci/inch 75 pci/inch 75 pci/inch Coefficient of friction 0.35 0.35 0.35 Passive pressure 225 pcf 225 pcf 225 pcf Soil suction (Pf) 3.6 3.6 3.6 Depth to constant soil suction 5 feet 5 feet 5 feet Thornthwaite moisture -200 -20.0 . -20.0 em edge 2.5 2.7 3.0 em center 5.0 5.5 5.5 Yrn edge 0.35 0.5 0.75 y center 1.1 2.0 2.5 Minimum slab thickness 5 inches 5 inches 5 inches F*Intcornal bearing values for grade beams of the Post-tension slab may be designed per the criteria provided nventional foundations. I GENERAL EARTHWORK AND GRADING GUIDELINES General These guidelines present general procedures and requirements for earthwork and grading as shown on the approved grading plans, including preparation of areas to filled, placement of fill, installation of subdrains and excavations. The recommendations áontained in the geotechnical report are part of the earthwork and grading guidelines and would supersede the provisions contained hereafter in the case of conflict. Evaluations performed by the consultant during the course of grading may result in new recommendations which could supersede these guidelines or the recommendations contained in the geotechnical report. I The contractor is responsible for the satisfactory completion of all earthwork in accordance with provisions of the project plans and specifications. The project soil engineer and engineering geologist (geotechnical consultant) or their representatives should provide I observation and testing services, and geotechnical consultation during the duration of the project. EARTHWORK OBSERVATIONS AND TESTING Geotechnical Consultant Prior to the commencement of grading, a qualified geotechnical consultant (soil engineer and engineering geologist) should be employed for the purpose of observing earthwork procedures and testing the fills for conformance with the recommendations of the geotechnical report, the approved grading plans, and applicable -grading codes and ordinances. The geotechnical consultant should provide testing and observation so that determination may be made that the work is being accomplished as specified. It is the responsibility of the contractor to assist the consultants and keep them apprised of anticipated work schedules and changes, so that they may schedule their personnel accordingly. All clean-outs, prepared ground to receive fill, key excavations, and sub.drains should be observed and documented by the project engineering geologist and/or soil engineer prior to placing and fill. It is the contractors's -responsibility to notify the engineering geologist and soil engineer when such areas are ready for observation. - Laboratory and Field Tests ; I Maximum dry density tests to determine the degree of compaction should be performed in accordance with American Standard Testing Materials test method ASTM designation D-1557-78. Random field compaction tests should be performed in accordance with test method ASTM designation D-1556-82, D-2937 or D-2922 and D-3017, at intervals of approximately 2 feet of fill height or every 100 cubic yards of fill placed These criteria I GeoSoils, would vary depending on the soil conditions and the size of the project: The location and frequency of testing would be at the discretion of the geotechnical consultant. Contractor's Responsibility All clearing, site preparation, and earthwork performed on the project should be conducted by the contractor, with observation by geotechnical consultants and staged approval by the governing agencies, as applicable. It is the contractors responsibility to prepare the ground surface to receive the fill, to the satisfaction of the soil engineer., and.to place, spread, moisture condition, mix and compact the fill in accordance with the recommendations of the soil engineer. The contractor should also remove all major non- earth material considered unsatisfactory by the soil engineer. It is the sole responsibility of the contractor to provide adequate equipment and: methods to accomplish the earthwork in accordance with applicable grading guidelines, codes or agency ordinances, and approved grading plans. Sufficient watering apparatus'and compaction equipment should be provided by the contractor with due consideration for the Jill material, rate of placement, and climatic conditions. If, in the opinion of the geotechnical consultant, unsatisfactory conditions such as questionable weather, excessive oversized rock, or deleterious material, insufficient support equipment, etc., are resulting in a quality of work that is not acceptable, the consultant will inform the. contractor, and the contractor is expected to rectify the conditions, and if necessary, stop' work until conditions are satisfactory. During construction, the contractor shall properly grade all surfaces to maintain good drainage and prevent pónding of water. The contractor shall take remedial measures to control surface water and to prevent erosion of graded areas Until such time as permanent drainage and erosion control measures have been installed. SITE PREPARATION All major vegetation, including brush, trees, thick grasses, organic, debris, and other deleterious material should be removed and disposed of off-site."' These removals must be concluded prior to placing. fill. Existing fill, soil, alluvium, colluvium, or rock materials determined by the soil engineer or engineering geologist as being unsuitable in-place 'I should be removed prior to fill placement. Depending upon the soil conditions, these materials may be reused as compacted fills. Any materials incorporated as part of the compacted fills should be approved by the soil engineer.. Any underground structures such' as cesspools, cisterns, mining shafts, tunnels, septic tanks, wells, pipelines; or other structures not located prior to grading are to be removed : or .treated in a manner .recommended by the soil engineer. Soft, dry, spongy, highly fractured, or otherwise unsuitable ground extending to such a depth that surface processing cannot adequately improve the condition should be overexcavated. down to Caiavera Hills Ii, LLC. . Appendix B File: e:\wp7\2700\2747a.ugr ' 'Page 2 GeoSoils, Inc. . I . firm ground and approved by thesoil engineer before compaction and filling operations continue. Overexcavated and processed soils which have been properly mixed and I moisture conditioned should be re-compacted to the minimum relative compaction as specified in these guidelines. I Existing ground which is determined to be satisfactory for support of the fills should be scarified to a minimum depth of 6 inches or as directed by the soil engineer. After the 1 . scarified ground is brought to optimum moisture content or greater and mixed, the materials should be compacted as specified herein. If the scarified zone is grater that 6 inches in depth, it may be necessary to remove the excess and place the material in lifts I .restricted to about 6 inches in compacted thickness. Existing ground which is. not satisfactory to support compacted fill should be I overexcavated as required in the geotechnical. report or by the on-site soils engineer and/or engineering geologist. Scarification, disc harrowing, or other acceptable form of mixing should continue until the soils are broken down and free of large-lumps or clods, I . until the working surface is reasonably uniform and free from ruts, hollow, hummocks, or other uneven features which would inhibit compaction as described previously. - Where fills are to be placed on ground with slopes steeper than 5:1 (horizontal to vertical), the ground should be stepped or benched. The lowest bench, which will act as a key, should be a minimum of 15 feet wide and should be at least 2 feet deep into firm material, and approved by the soil engineer and/or engineering geologist. In fill over cut slope conditions, the recommended minimum width of the lowest bench or key is also 15 feet with the key founded on firm material, as designated by the Geotechnical Consultant. As a general rule, unless specifically recommended otherwise by the Soil Engineer, the minimum width of fill keys should be approximately equal to 1/2 the height of the slope. 1' Standard benching is generally 4 feet (minimum) vertically, exposing firm, acceptable V material. Benching may be used to remove unsuitable materials, although it is understood I that the vertical height of the behch may exceed 4 feet. Pre-ètripping may be considered for unsuitable materials in excess of 4 feet in thickness. All areas to receive fill, including processed areas, removal areas, and the toe of fill benches should be observed and approved by the soil engineer and/or engineering geologist prior to placement of fill. Fills may then be properly placed and compacted until design grades (elevations) are attained. V COMPACTED FILLS Any earth materials imported or excavated on the property my be utilized in the fill provided that each material has been determined to be suitable by the soil engineer. These materials should be free of roots, tree branches, other organic matter, or other deleterious materials. All unsuitable materials should be removed from the fill as directed Calavera Hills II, LLC Appendix B V File: e:\wp7\2700\2747a.ugr Page GeoSoils, Inc. I 'I I I' by the soil engineer. Soils of poor gradation, undesirable expansion potential, or substandard strength characteristics may be designated by the consultant as unsuitable and may require blending with other soils to serve as a satisfactory fill material Fill materials derived from benching operations should be dispersed throughout the fill I ared and blended with other bedrock derived material. Benching operations should not result in the benched material being placed only within asingle equipment width away I from the fill/bedrock contact Oversized materials defined as rock or other irreducible materials with a maximum dimension greater.thán 12 inches should not be buried or placedin fills unless the location of materials and disposal methods are specifically approved by the soil engineer. Oversized material should be taken off-site or placed in accordance with recommendations J of the soil engineer in areas designated as suitable for rock disposal. Oversized material • should not be placed within 10 feet vertically of finish grade (elevation) or within 20 feet horizontally of slope faces.Ap . To facilitate future trenching, rock should not be placed within the range of foundation excavations, future utilities, or underground construction unless specifically approved by the soil engineer and/or the developers representative; If import material is required for grading, representative samples of the materials to be utilized as compacted fill should be analyzed in the laboratory by the soil engineer to determine its physical properties. If any material other than that previously tested is encountered during grading, an appropriate analysis of this material should be conducted -by the soil engineer as soon as possible Approved fill material should be placed in areas prepared to receive fill in near horizontal layers that when compacted should not exceed 6 inches in thickness The soil engineer , may approve thick lifts if testing indicates the grading procedures are such that adequate compaction is being achieved with lifts of greater thickness. Each layer should be spread evenly and blended to attain uniformity of material and moisture suitable for compaction. Fill layers at a moisture content less than optimum should be watered and mixed, and wet fill layers should be aerated by scarification or should be blended with drier material. Moisture condition, blending, and mixing of the fill layer should continue until the fill materials have a uniform moisture content at or above optimum moisture. After each layer has been evenly spread, moisture conditioned and mixed, it should be I funiformly compacted to.a minimum of 90 percent of maximum density as determined by - ASTM test designation, D-1557-78, or as otherwise recommended by the soil engineer. Compaction equipment should be adequately sized and should be specifically designed for soil compaction or of proven reliability to efficiently achieve the specified degree of compaction. . i Caiavera Hills ii, LLC Appendix B I ' File: e:\wp7\2700\2747a.ugr . . .. Page 4 GeoSoils, Inc. . I Where tests indicate that the density of any layer of fill, or portion thereof, is below the required relative compaction, or improper moisture is in evidence, the particular layer or portion shall be re-worked until the required density and/or moisture content has been attained. No additional fill shall be placed in an area until the last placed lift of fill has been tested and found to meet the density and moisture requirements, and is approved by the soil engineer. - -Compaction of slopes should be accomplished by over-building a minimum of 3 feet horizontally, and subsequently trimming back to the design slope configuration. Testing shall, be performed as the fill is elevated toevaluate compaction as the fill core is being developed..Special efforts may be necessary to attain the specified compaction in the fill slope zone. Final slope shaping should be performed by trimming and removing loose materials with appropriate equipment A final determination of fill slope compaction should be based on observation and/or testing of the finished slope face. -Where compacted fill slopes are designed steeper than 2:1 (horizontal to vertical), specific material types, a , higher minimum relative compaction, and special grading procedures, may be recommended. If an alternative to over-building and cutting back the compacted fill slopes is-selected, : then special effort should be made to achieve the required compaction in the outer 10 feet of each lift of fill by undertaking the following 1. An extra piece of equipment consisting of a heavy short shanked sheepsfoot should be used to roll (horizontal) parallel to the slopes continuOusly as fill is placed. The sheepsfoot roller should also be used to roll perpendicular to the slopes, and extend out over the slope to provide adequate compaction to the face of the slope. 2. Loose fill should not be spilled out over the face of the slope as each lift is compacted. Any loose fill spilled over a previously completed slope face should be trimmed off or be subject to re-rolling. .3.Field compaction tests will be made in the outer (horizontal) 2 to 8 feet of the slope at appropriate vertical intervals, subsequent to compaction operations. After completion of the slope, the slope face should be shaped with a small traOtor, and then re-rolled with a sheepsfoot to achieve compaction to near the slope face. Subsequent to testing to verify compaction, the slopes should be grid-rolled to achieve compaction to the slope face. Final testing should be used to confirm compaction after grid rolling. Where testing indicates less than adequate compaction, the contractor will be - responsible to rip, water, mix and re-compact the slope material as necessary to 1 achieve compaction Additional testing should be performed to verify compaction I Calavera Hills II, LLC • Appendix B File: e:\wp7\2700\2747a.ugr - Page 5 GeoSoils, Inc. • • • I I 6. Erosion control and drainage devices should be designed by the project civil engineer in compliance with ordinances of the controlling governmental agencies, 'I and/or in accordance with the recommendation of the soil engineer or engineering geologist. ..: SUBDRAIN INSTALLATION S. I Subdrains should be installed in approved-ground in accordance with the approximate alignment and details indicated by the geotechnical consultant. SUbdrain locations or I :materials should not be changed or modified without approval of the geotechnical / consultant. The soil.engineer.and/or. engineering geologist may recommend and direct changes •in sUbdrain line, grade, and drain material in the field, pending exposed conditions. The location of constructed subdrainsshould be recorded by .the project civil engineer. I EXCAVATIONS Excavations and cut slopes should be examined during grading by the engineering geologist. If directed by the engineering geologist, fUrther excavations Or overexcavation and re-filling of cut areas should be performed and/or remedial grading.of cut slopes should be.performed. When fill over cut slopes are to; be graded, unless otherwise I .approved, the cut portion of the slope should be observed by the engineering geologist prior to placement of materials for construction of the fill portion of the slope. The engineering geologist should observe all cut slopes and should be notified by the contractor when cut slopes are started. If, during the course of grading, unforeseen.adverse or potential adverse geologic conditions are encountered, the engineering geologist and soil engineer should I investigate, evaluate and make recommendations to treat these problems. The need for cut slope buttressing or stabilizing should be based on in-grading evaluation by the engineering geologist, whether anticipated or not. . . I Unless otherwise specified in soil and geological reports, no cut slopes should be excavated higher or steeper than that allowed by the ordinances of controlling governmental agencies. Additionally, short-term stability of temporary dut slopes is the contractors responsibility. .. ... . . . •. . I; .Erosion control and drainage devices should be designed by the project civil engineer and should be constructed in compliance with the ordinances of the controlling governmental agencies, and/or in accordance with the recommendations of the soil engineer or engineering geologist. . . . I .• • ..V ••,, . .• .. Ca!avera Hills II, LLC . . . . . • Appendix B. File e \wp7\2700\2747a ugr Page 6 . •. . . . GeoSoils, Inc. • . . . . . . • Observation testing and consultation by the geotechnical consultant should be conducted during the grading operations in order to state an opinion that all cut and filled areas are graded in accordance with the approved project specifications After completion of grading and after the soil engineer and engineering geologist have finished their observations of the work, final reports should be submitted subject to review by the controlling governmental agencies.. No further excavation or filling should be undertaken without prior notification of the soil engineer and/or engineering geologist All finished cut and fill slopes should be protected from erosion and/or be planted in accordance with the project specifications and/or as recommended by a landscape - architect Such protection and/or planning should be undertaken as soon as practical after completion of grading JOB SAFETY General . At GeoSoils, Inc. (GSI) getting the job done safely is of primary concern. The following is the company's safety considerations for use by all employees on multi-employer construction sites. On ground personnel are at highest risk of injury and possible fatality on grading and construction projects.. GSI recognizes that construction activities will vary on each site and that site safety is the prime responsibility of the contractor; however, everyone must be safety conscious and responsible at all times. To achieve our goal of: avoiding accidents, cooperation between the client, the contractor and GSI personnel must be maintained.. In an effort to minimize risks associated with geotechnical testing and observation, the following precautions are to be implemented for the safety of field personnel on grading and construction projects: . S Safety Meetings: GSI field persOnnel are directed to attend contractors regularly scheduled and documented safety meetings. Safety Vests: .:Safety Flags: Safety vests are provided for and are to be worn by GSI personnel at all times when they are .working in the field. Two safety flags are. provided to GSI field technicians; one is to be affixed to the vehicle when on site, the other is to be placed atop the spoil pile on all test pits. S Cälavera Hills Ii, LLC S Appendix B File: e:\wp7\2700\2747a.ugr Page 7 GèSoils, Inc. I J Flashing Lights: All vehicles stationary in the grading area shall use rotating or flashing, amber beacon,or strobe lights, on thevehicle during all field testing. J While operating a vehicle in the grading area the emergency flasher on the vehicle shall be activated. I In the event that the contractor's representative observes any of our personnel not following the above, we request that it be brought to the attention of our office. Test Pits Location. Orientation and Clearance I , The technician is responsible for selecting test pit locations. A primary concern should be : the technicians's safety. Efforts will be made to coordinate locations with the grading contractors authorized representative, and to select locations following or behind the I .. established traffic pattern, preferably outside of current traffic; The contractors authorized representative. (dump man, operator, supervisor,, grade checker, etc.) should direct excavation of the pit and safety during the test period. Of.paramount concern should be the soil technicians safety and obtaining enough tests to represent the fill. Test pits should be excavated so that the spoil pile is placed away form oncoming traffic, I whenever possible. The technician's vehicle is to be placed next to the test pit, opposite the spoil pile This necessitates the fill be maintained in a driveable condition Alternatively, the contractor may wish to park a piece of equipment in front of the test I ' holes, particularly in small fill areas or those with limited access. A zone of non-encroachment should be established for all test pits. No grading equipment.. should enter this zone during the testing procedure. The zone should extend approximately 50 feet outward from the center of the test pit. This zone is. established for safety and to avoid excessive ground vibration which typically decreased test results. When taking slope tests the technician should park the vehicle directly above or below the I.. test location. If this is not possible, a prominent flag should be placed at the top of the slope. The contractor's representative should effectively keep all equipment at a safe operation distance (e.g. 50 feet) away from the slope during this testing. . .1. The technician is directed to withdraw from the active portiOn of the fill as soon as possible following testing. The technician's vehicle should be parked at the perimeter of the fill in , a highly visible location, well away from the equiprnenttraffic pattern. The contractor should inform our personnel of all changes -to haul roads, cut and fill areas or other factors that may affect site access and site safety. In the event that the technicians safety is jeopardized or compromised as a result of the Icontractors failure to comply with any of the above, the technician is required, by company policy, to immediately withdraw and notify his/her supervisor: The grading contractors representative will eventually be contacted in an effort to effect a solution: However, in the Calavera Hills il, LLC . ' • Appendix B File: e:\wp7\2700\2747a.ugr . . Page 8 I , . . GeoSoils, Inc. .• • I * I interim, no further testing will be performed until the situation is rectified Any fill place can I be considered unacceptable and subject to reprocessing, recompaction or removal In the event that the soil technician does not comply with the above or other established safety guidelines, we request that the contractor brings this to his/her attention and notify, this office. Effective communication and coordination between the contr-actors: representative arid the soils technician is strongly encouraged in order to implement the. lv : above safety plan.. . . Treñchand Vertical Excavation ; It is the contractor's responsibility to provide safe access into trenthes'where compaction testing is needed. . .. .. I Our personnel are directed not to enter any excavation or vertical cut which 1) is 5 feet or' deeper unless shored or laid back, 2) displays any evidence of instability, has any loose , .. rock or other debris which could fall into the trench, or 3) displays any other evidence of - any unsafe conditions regardless of depth.. . . I. All trench excavations or vertical cuts in excess of 5 feet deep, which any person enters,, should be shored or laid back. ..' .' -. . . . .*• ,.' I. Trench access should be provided in accordance with CAL-OSHA and/or state and local standards. Our personnel are directed not to enter any trench by being lowered or "riding I. down" on the equipment. v • . . If the contractor fails to provide safe access to trench'es for compaction.testing, our ' I ,company policy requires that the soil technician withdraw and notify his/her supervisor. The contractors representative will eventually be contacted in an effort to effeét a'solution. All backfill not tested due to safety concerns or other reasons could be subject to reprocessing and/or removal. If GSI personnel become aware of anyone 'working beneath an unsafe trench wall or vertical excavation', we have a legal obligation to put the contractor and owner/developer on notice to immediately correct the situation. If corrective steps are not taken, GSI then has an obligation td notify CAL-OSHA and/or the proper authorities.. . I ' . ' . '. •'.' I, * - Calavera Hills Ii, LLC . . , Appendix B File: e:\wp7\2700\2747a.ugr • . . -. . . . • . ' Page 9 GeoSoits,'Inc. • .• . , - I I DETAIL FOR FILL SLOPE TOEING OUT i ON FLAT ALLUVIATED CANYON I TOE OF SLOPE AS SHOWN ON GRADING PLAN FILL ORIGINAL GROUND SURFACE TO BE \ - I RESTORED WITH COMPACTED FILL ORIGINAL GROUN0 SURFACE I 'BACKCUT - VARIES. FOR DEEP, REMOVALS.: BACXCUT 1\SHOULD BE MADENO STEEPER THA:1 OR As NECESSARY . ANTICIPATED ALLUVIAL. REMOVAL .• OR SAFETY .ONSI0ERATIONS'. I DEPTH PER SOIL ENGcER. %• ./ ••- :. :.. ••':• OVIDE All' MINIMUM PROJECTION FR'OM TOE OF- I : SLOPE AS SHOWN ON GRADING PLAN TOTHE RECOMMENDED, REMOVAL DEPTH. SLOPE HEIGHT. SITE CONDITIONS AND/OR LOCAL CONDITIONS COULD DICTATE FLATTER PROJECTIONS. REMOVAL ADJACENT TO EXISTING FILL' i ADJOINING CANYON FILL I - - - - PROPOSED ADDITIONAL COMPACTED FILL COMPACTED FILL LIMITS LINE' I . . . TEMPORARY COMPACTED FILL >FOR DRAINAGE ONLY I Oaf \ Oaf OaI - (TO BEREMOVEO) / . (EXISTING COMPACTED FILL) \ / LEGEND -' TO BE REMovEo:BEFoRE Oaf ARTIFICIAL FILL I ', •' . PLACING ADDITIONAL • • COMPACTED FILL Oat ALLUVIUM ATE EG-.3 PL 1 TYPICAL STABILIZATION / BUTTRESS SUBORAIN DETAIL FILTER MATERIAL: MINIMUM OF FIVE Ft'/LINEAR Ft OF PIPE OR FOUR Ft/LINEAR Ft OF PIPE WHEN PLACED IN SQUARE FILTER MATERIAL SHALL BE OF 2 INIMU CUT TRENCH. THE FOLLOWING SPECIFICATION ALTERNATIVE IN LIEU OF FILTER MATERIAL: GRAVEL MAY BE OR AN APPROVED EQUIVALENT: EPICASEO IN APPROVED FILTER FABRIC. FILTER FABRIC SIEVE SIZE PERCENT PASSING . ,.•. - - . SHALL BE MIRAFI 140 OR EQUIVALENT. FILTER FABRIC 1 INCH . 100 SHALL BE LAPPED A MINIMUM OF 12 ON ALL JOINTS 3/4 INCH 90-100 4 MINIMUM .2 MINIMUM MINIMUM 4 DIAMETER PIPE: ABS-ASTM 0-2751..SOR.35 . .3/8 INCH ' 40-100 PIPE OR ASTM 0-1527 SCHEDULE 40 PVC-ASTM 0-3034. NO. 4 25-40 SDR350R ASTM 0-1785 SCHEDULE 40 WITH A CRUSHING NO.8 18-33 • - STRENGTH OF 1,000 POUNDS MINIMUM. AND A MINIMUM OF NO. 30 . 5-15 8 UNIFORMLY SPACED PERFORATIONS PER FOOT OF PIPE NO 50 0-7 1. MINIMUM PIPE -_ INSTALLED WITH PERFORATIONS OF-BOTTOM OF PIPE. NO. 200 0-3 "i'INIMUM . PROVIDE CAP AT UPSTREAM END OF PIPE. SLOPE AT 2% - . TO OUTLET PIPE. OUTLET PIPE TO BE CONNECTED TO GRAVEL SHALL BE OF THE , SUBDRAIN PIPE WITH TEE OR ELBOW. . . FOLLOWING SPECIFICATION OR NOTE: 1. TRENCH FOR OUTLET PIPES TO BE BACKFILLED - AN APPROVED EQUIVALENT: - WITH ON-SITE SOIL. SIEVE SIZE PERCENT PASSING 2 MINIMUM .2. BACKORAINS AND LATERAL DRAINS SHALL BE 1 1/2 INCH 100 - LOCATED ATELEVATION OF EVERY BENCH DRAIN. NO. 4 50 - • FIRST DRAIN LOCATED AT ELEVATION JUST ABOVE NO. 200 8 LOWER LOT GRADE.,ADDITIONAL DRAINS MAY BE SAND EQUIVALENT MINIMUM OF 50 REQUIRED AT THE DISCRETION OF THE SOILS ENGINEER AND/OR ENGINEERING GEOLOGIST Ui' - -- -. FILL OVER NATURAL. DETAIL SIDEHILL FILL -. COMPACTED FILL PROPOSED GRADE MAINTAIN MINIMUM 15 WIDTH TOE OF SLOPE AS SHOWN ON GRADING PLAN SLOPE TO BENCH/BACKCUT PROVIDE A 11 MINIMUM PROJECTION FROM / DESIGN TOE OF SLOPE TO TOE OF KEY AS SHOWN SHOWN ON AS BUILT 1 %3'4 UNWIAW1 .. - NATURAL SLOPE TO' . / .-•.14 BE RESTORED WITH / COMPACTED FILL / •_•_•••_ / \\ BENCH WIDTH MAY VARY BACK CUT VARIES . - ..... - - 1][3 MINIMUM fluI/t •/ NOTE 1 WHERE THE NATURAL SLOPE APPROACHES OR EXCEEDS THE / 1MINIMUM KEY WIOT I DESIGN SLOPERATIO. SPECIAL RECOMMENDATIONS WOULD BE 2'X 3' MINIMUM KEY DEPTH PROVIDED BY THE SOILS ENGINEER. . * / • 2. THE NEED FOR AND DISPOSITION OF DRAINS WOULD BE DETERMINED 2-MINIMUM IN BEDROCK OR • BY THE SOILS ENGINEERBASEO UPON EXPOSED CONDITIONS. m APPROVED MATERIAL C) • •- - * • • - I • F- - - ..- - - - - - - - - - - - - - - - - - - - FILL OVER CUT DETAIL Mai — — M. — — — — — — — — — M.1—, — — — — -- STABILIZATION FILL FOR UNSTABLE MATERIAL EXPOSED IN PORTION OF CUT SLOPE REMOVE UNSTABLE MATERIAL NATURAL SLOPE - - - - - 1-.15* MINIMUM - --' P - RD OSED FINISHED GRADE 1.0.00 - 5 UNWEATHERED BEDROCK S . S - OR APPROVED MATERIAL• • H2 - REMOVE: UNSTABLE MATERIAL / COMPACTED STABILIZATION FILL • V MINIMUM TILTED BACK IF RECOMMENDED BY THE SOILS ENGINEER AND/OR ENGINEERING • - '2 GEOLOGIST. THE REMAINING. CUT PORTION OF THE SLOPE MAY - WI—__— _1,7 REQUIRE REMOVAL AND REPLACEMENT WITH COMPACTED FILL. m NOTE: l. SUBORAINS ARE NOT REQUIRED UNLESS SPECIFIED BY SOILS ENGINEER AND/OR ENGINEERING GEOLOGIST,, M, 2 W SHALL BE EQUIPMENT WIDTH (is') FOR SLOPE HEIGHTS LESS THAN 25 FEET FOR SLOPES GREATER T -THAN 25 FEET W SHALL BE OETERMINED-BY.THE PROJECT-SOILS ENGINEER AND-/OR ENGINEERING 00 GEOLOGIST AT NO TIME SHALL W BE LESS THAN H12 - - a. -. ,-. a - - a 'a a a I I TRANSITION LOT DETAIL I CUT LOT (MATERIAL TYPE TRANSITION) ALGRA MINIJM - I PAD GRADE, OVERCAVATE AND RECOMPACT COMPACTED FILL I \\Y3 MINIM U M* UNWEATHERED BEDROCK OR APPROVED MATERIAL II TYPICAL BENCHING CUT-FILL LOT (DAYLIGHT TRANSITION) 10 I (MUM NATURAL GRADE- Ji I PAD ' GRADE OV1AVA TE Y COMPACTED FILL RECOMPACT co\-v voll AND I /\\ fA\ //\\ ç\\/,ç\\' 3 MINIMUM*, I UNWEATHERED BEDROCK OR APPROVED MATERIAL '1 a I / TYPICAL BENCHING I NOTE *DEEPER OVER EXCAVATION MAY BE RECOMMENDED BY THE SOILS ENGINEER I AND/OR ENGiNEERING GEOLOGIST IN STEEP CUT-FILL TRANSITION AREAS: I PLATE EG-11 It I OVERSIZE ROCK DISPOSAL VIEWS ARE DIAGRAMMATIC ONLY ROCK SHOULD NOT TOUCH I AND VOIDS SHOULD BE COMPLETELY FILLED IN. VIEW NORMAL TO SLOPE FACE • I PROPOSED FINISH GRADE O. MINIMUM (E) co co co 1 INIMUM (A) I 20MiNIMU0. (B) (a I •. 00 S (F) i MINIMUMLr MINIMUM (C) 1 BEDRÔCK rRAPPROVED MATERIAL . . VIEW PARALLEL TO SLOPE FACE I PROPOSED FINISH GRACE, 110 MINIMUM (El '. O' MAXIMUM (BL_ : I 1O . . 3MINIMUM 1 10' MINIMUM . 10 MINIMUM . (F) I .. 15* MINIMUM (C) BEDROCK OR APPROVED MATERIAL 1 . NOTE: (A). ONE EQUIPMENT WIDTH OR A MINIMUM OF 15 FEET. . HEIGHT AND WIDTH MAY VARY DEPENDING ON ROCK SIZE AND TYPE OF I . EQUIPMENT USED. LENGTH OF.WINOROW SHALL BE NO GREATER THAN 100' MAXIMUM. . .. . . IF APPROVED BY THE SOILS ENGINEER AND/OR ENGINEERNG GEOLOGIST WINDROWS MAY BE PLACED DIRECTLY ON COMPETENT MATERIALS OR BEDROCK .I. PROVIDED ADEQUATE SPACE IS AVAILABLE FOR.' COMPACTION. (0) ORIENTATION OF WINDROWS MAY VARY BUT SHALL BE AS RECOMMENDED BY THE SOILS ENGINEER AND/OR ENGINEERING GEOLOGIST. STAGGERING OF WINDROWS IS NOT..NECESSARY UNLESS RECOMMENDED I . (E) CLEAR AREA FOR UTILITY TRENCHES. FOUNDATIONS AND SWIMMING POOLS.. . .. - IF) VOIDS IN WINDROW SHALL BE FILLED BY FLOODING GRANULAR SOIL INTO PLACE. GRANULAR SOIL SHALL BE ANY SOIL WHICH HAS A UNIFIED SOIL CLASSIFICATION I . SYSTEM (UBC 29-1) DESIGNATION OF SM. SP. SW. GP. OR GW. ALL FILL OVER AND AROUND ROCK WINDROW SHALL BeCOMPACTED TO 90% RELATIVE . COMPACTION. . * AFTER FILL BETWEEN WINDROWS. IS PLACED AND COMPACTED WITH THE LIFT I OF FILL COVERING WINDROW. WINDROW SHALL BE PROOF ROLLED WITH A 0-9. - DOZER OR EQUIVALENT. OVERSIZED ROCK IS DEFINED AS LARGER THAN 12's AND LESS THAN 4. FEET I IN SIZE.PLATE EG-12 I I SETTLEMENT PLATE AND RISER DETAIL 2'X 2'X 1/4 STEEL PLATE - STANDARD 3/1. PIPE NIPPLE WELDED TO TOP I .... OF PLATE -3/4 X 5 GALVANIZED PIPE STANDARD PIPE N THREADS TOP AND BOTTOM. EXTENSIONS V THREADED ON BOTH ENDS AND ADDED IN 5 N INCREMENTS. V 1 3 INCH SCHEDULE 40 PVC PIPE SLEEVE ADO IN 5 INCREMENTS WITH GLUE JOINTS FINAL GRADE - 'I I I . MAINTAIN 5' CLEARANCE OF HEAVY EQUIPMENT. I JJjj1 .......MECHANICALLY HAND COMPACT IN 2VERTICAL -nu-4- LIFTS OR ALTERNATIVE SUITABLE TO AND ACCEPTED BY THE SOILS ENGINEER. iI[ •V V V 1 MECHANICALLY HAND COMPACT THE INITIAL 5 ,) VERTICAL WITHIN A 5 RADIUS OF PLATE BASE. I / V T.BOT OMOFCLEANOUT - - PROVIDE A MINIMUM 1 BEDDING OF COMPACTED SAND I NOTE V 1.. LOCATIONS OF SETTLEMENT PLATES SHOULD BE CLEARLY MARKED AND READILY 'I V VISIBLE (RED FLAGGED) TO EQUIPMENT OPERATORS; : V V 2. CONTRACTOR SHOULD MAINTAIN CLEARANCE OF A 5 RADIUS OF PLATE,BASE AND WITHIN 5(VERTICAL) FOR HEAVY EQUIPMENT. ALL WITHIN CLEARANCE AREA SHOULD V V BE HAND COMPACTED TO PROJECT SPECIFICATIONS OR COMPACTED BY ALTERNATIVE I V • APPROVED BY THE SOILS ENGINEER. 3. AFTER 5(VERTICAL) OF FILL IS IN PLACE. CONTRACTOR SHOULD MAINTAIN A 5 RADIUS V EQUIPMENT CLEARANCE FROM RISER, V V • 4• PLACE AND MECHANICALLY HAND COMPACT INITIAL 2OF FILL PRIOR TO ESTABLISHING I.; THE INITIAL READING. V V 5. IN THE EVENT OF DAMAGE TO THE SETTLEMENT PLATE OR EXTENSION RESULTING FROM EQUIPMENT OPERATING WITHIN THE SPECIFIED CLEARANCE AREA. CONTRACTOR I SHOULD IMMEDIATELY NOTIFY THE SOILS ENGINEER AND SHOULD BE RESPONSIBLE V FOR RESTORING THE SETTLEMENT PLATES TO WORKING ORDER. 6. AN ALTERNATE DESIGN AND METHOD OF INSTALLATION MAY BE PROVIDED AT'THE V DISCRETION OF THE SOILS ENGINEER. V V I PLATE EG-14 ' I I OVERSIZE ROCK DI SPOSAL - VIEW NORMAL TO SLOPE FACE - I PROPOSED FINISH GRADE 00 15* MINIMUM (A) co -2 W MINI um -2 MINI MU • - . MINIMUM ( q. , 17\ IN BEDROCK OR APPROVED MATERIAL',. I. I 1 VIEW PARALLEL TO SLOPE FACE I I I PROPOSED FINISH GRADE IMUMcE 00 MAXIMUM (B! xt 151 MINIMUM, X MINIMUM 15* MINIMUM. 5'MINIMUM (C) I FROM I' MINIMUM (C) BEDROCK OR APPRbVEO MATERIAL I: NOTE: ONE EQUIPMENT WIDTH OR A MINIMUM OF 15 FEET. HEIGHT AND WIDTH MAY VARY DEPENDING ON ROCK SIZE AND TYPE OF 1 EQUIPMENT. LENGTH OF.WINDROW SHALL BE NOGREATER. THAN 100 MAXIMUM. • (C) IF APPROVED BY THE SOILS ENGINEER AND/OR ENGINEERING GEOLOGIST. . WINDROWS MAY BE PLACED DIRECTLY ON COMPETENT MATERIAL OR BEDROCK I PROVIOEOADEQUATE SPACE IS AVAILABLE FOR COMPACTION. (0) ORIENTATION OF WINDROWS MAY VARY BUT SHOULD BE ASRECOMMENDE0BY THE SOILS ENGINEER AND/OR ENGINEERING GEOLOGIST. STAGGERING OF r . WINDROWS IS NOT NECESSARY UNLESS RECOMMENDED. • I CLEAR AREA FOR UTILITY TRENCHES. FOUNDATIONS AND SWIMMING POOLS. ALL FILL OVER AND AROUND ROCK WINDROW SHALL BE COMPACTED TO 90% RELATIVE COMPACTION OR AS RECOMMENDED. • • • AFTER FILL BETWEEN WINDROWS IS PLACED AND COMPACTED WITH THE LIFT OF I .(G) • FILL COVERING WINDROW.* WINDROW SHOULD BE PROOF ROLLED WITH A •H • • • 0-9DOZER OR EQUIVALENT. • . • • • • • • I ROCK SHOULD. • VIEWS ARE DIAGRAMMATIC ONLY. NOT TOUCH I AND VOIDS SHOULD BE COMPLETELY FILLED IN.PLATE RD-1 S. _____________ _____________ - ----- ------- ___-________________ - --- I'll --- - - - - - - ----- 1. 1. I I I . . . -_-_ . I ______________________________ I I . I 11 . 1 , —c:irrr J )"" OF cuECTc LOS ANGELES CO. rict.i r, ' . - '-S . . . . ,~ ,~~, f, 1, --_,: ), ~ . I RIVERSIDE CO. I I I I SE SHEET 2 1 1 1 . . I 01'~ .r t - ,~ ,11._- 1 . I ., ~ I 1, I SANDEOCO. 1 11 i I . 6 , r~~,,Tt 4 ORANGE CO. I I I .WALL \ 7 \ ,q 1 " J T i v obounnin~ .7\J. . ,'\ , -- --- r /tb \ ,- \ 12 \45\ z' / / D. / I/' I - / GEOLOGIC [AP / --,1 1 11. , 0 I - 1. — \ , - - ,_ ,z ~11 L~, L , , . I , ~ I , , - - ! , , _ 4 , , ~ , , ~ ------ - / / 11 -11 \\ w . Ø21-A-SDATE 11/99 SCALE Pte 2 I ,~~, ,_ \ L Ix 1. J7_:~~ -'111 I ~. :', t / - - // / 1.7 \\ Sheet 2 of 2 -i (/1 0-1 - I \ -: Z \\\ 7 / ,1 ", 1/' ,// \See Plate I for legend / f \ \: i\ -11 - ~ ~ - , _,_.- ,~ ; L ! 1, PO I ~ 1 I I , ~, - , \ , V ,, :, - - I .1 \ 11 ~., I . 1, \ I . I __ . 1 ~ vc - I I — 1- -1 . ~ ---, -, I I - _." '~T I " *1 ~ ., ,;~, ~ ~ ,~ - - ~ #LL I 11 - , - j 1-;)i - - - .", ., ,.f 41' 6', 1, , \\ ,!~~Iq . 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