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Home My WebLink AboutCDP 97-23; Mann Residence; Coastal Development Permit (CDP) (3)BARRY AND ASSOCIATES GEOTECHNICAL ENGINEERING P.O. Box 230348 Encinitas, CA 92023-0348 (61 9) 753-9940 July 23, 1997 , Mr. Morton S. O'Grady, Architect 4407 Manchester Ave. Suite 206 Encinitas, California 92024 Sub] ec t : LIMITED GEOTECHNICAL RECONNAISSANCE Addition to Single Family Residence 2701 Ocean Street Carlsbad, California Owner: William C. Mann Reference: 1. Plans Prepared By: Morton S. O'Grady, Architect Dated 6/3/97 2. Limited Soils Investigation Existing Steinhart Residence 2701 Ocean Street Carlsbad, California 92008 Dated June 14, 1988 Dear Mr. O'Grady, In response to your request, we have performed a limited geotechnical reconnaissance at the subject site for the proposed , addition to the existing residence as shown on the referenced plans. The findings of our reconnaissance and recommendations are presented in this report. From a geotechnical point of view, it is our opinion that the addition as shown on the referenced plans can be accomplished without impacting the slope stability as it presently exists, provided the-recommendations in this report are implemented during the design construction phases. If you have any questions, please do not hesitate to contact us at (760) 753-9940. Respectfully submitted, July 23, 1997 Page 2 W.O. #P-1514 INTRODUCTION This report presents the results of our limited geotechnical reconnaissance. The purpose of the study is to evaluate general conditions as they may relate to impacting the slope stability adjacent to the beach, and to obtain sufficient information to assign an allowable soil bearing value for the proposed footings. SITE CONDITIONS The subject property is located on the west side of Ocean Street the second lot south of the intersection of Beech Avenue and Ocean Drive, in the City of Carlsbad California. The property includes a single family residence with garage and rear deck. PROPOSED ADDITIONS Plans for the additions include a 5.0' extension of the main level 4:-.: . I ...i -- i. AIj and upper level south wall with supporting columns, a new two car g !:$ I k22 The investigation consisted of a property and review of the referenc 24% ' E&pared by Southern California Soi h.'*,- new continuous 'arage, planter , visual reconnai 'ed Limited Soils .Is and Testing. footings and and relocation ssance of the Investigation July 23, 1997 Page 3 I W.O. #P-1514 I I’ 1 : I I I .. CONCLUSIONS AND RECOMMENDATIONS General Based on the results of our reconnaissance, review of the available documents, and knowledge of the immediate area we conclude that the on site soils are suitable for the support of the proposed additions, provided the recommendations in this report are implemented during the design and construction phase. Foundation Footings for the proposed additions should be a minimum of 15 inches wide and founded a minimum of 18 inches below grade. A 12- inch-by-12-inch grade beam should be placed across the garage for a bearing value of 1500 psf. The bearing value indicated above is for the total of dead and live loads. This value may be increased by 33 percent for short durations of loading, including the effects of wind and seismic Resistance to lateral load may be provided by friction acting at ase of foundations and passive earth pressure. A coefficient A passive tion of 0.3 should be used with dead-load forces. July 23, 1997 W.O. #P-1514 Page 4 I earth pressure of 250 pounds per square foot, per foot of depth of fill penetrated to a maximum of 1500 pounds should be used in the design. Minimum steel reinforcement should consist of 4-#4 bars, 2 placed 3" from the bottom of the footing and 2 placed below the top of the footing. Garase Slab on qrade Slab on grade should be a minimum of 4 inches thick and reinforced in both directions with #3 bars, placed 18 inches on center each way, or #4 bars placed 24" on center each way. Utility trenches underlying the slab should be bedded in clean sand to at least one foot above the top of the conduit, then backfilled with the on-site granular materials, compacted to a minimum of 90 percent of the laboratory maximum dry density. However, sufficiently compacting the backfill deposits may damage or break shallow utility lines. Therefore, minor settlement of the backfill in the trenches is anticipated in these shallow areas. To reduce the possibility of cracks occurring, the slab should be provided with additional reinforcement to bridge the trenches. Drainaqe All roof water should be collected and conducted to the street via non-erodible devices. Roof gutters are recommended. Pad water July 23, 1997 Page 5 ? W.O. #P-1514 should be directed away from foundations anc around the residence to a suitable location. Pad water should not pond. Footins Inspections structural footing excavations should be inspected by a representative of this firm during excavation. Additional recommendations may be made at that time. LIMITATIONS If conditions encountered during construction appear to differ from those described in this report, our office should be notified so that we may consider whether modifications are needed. No responsibility for construction compliance with design concepts, specifications or recommendations given in this report is assumed unless on-site review is performed during the course of construction. The professional judgments presented herein are founded partly on our assessment of the technical data gathered, partly on our understanding of the proposed construction and partly on our in giv the geotechnical field. Our 'en meet present professional engineering work standards. July 23, 1997 Page 6 W.O. #P-1514 If you have any questions, please do not hesitate to contact our office at 753-9940. The opportunity to be of service is greatly appreciated. Respectfully submitted, A.R. BARRY AND ASSOCIATP A.R. Barry,