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Home My WebLink AboutS2020-0097 - Soils'f ~ = G O 4=1 r rr-n 801 Glenneyre St. • Suite F • Laguna Beach • CA 92651 (949) 494-2122 • FAX (949) 497-0270 April 29, 2020 Revised June 19, 2020 KAZ Investment Management c/o Brion Jeannette Architecture 470 Old Newport Boulevard Newport Beach, California 92663 BUILDING DMSION OM i ? E `'`??0 Project No: 72370-01 BY: S.R.G. Report No: 20-8705R Attention: Mr. Martin Bard Subject: Supplemental Geotechnical Recommendations for Proposed Pool New Single -Family Residence 3235 Ocean Boulevard Corona Del Mar, California References: 1. Geofirm, 2013, "Update Preliminary Geotechnical Investigation, Proposed New Single -Family Residence, 3235 Ocean Boulevard, Corona del Mar, California", Project No. 71879-01, Report No. 13-7345r, dated September 12. 2. Geofirm, 2014, "Update Preliminary Geotechnical Recommendations for Project Design Revisions, Proposed New Single -Family Residence, 3235 Ocean Boulevard, Corona del Mar, California", Project No. 71879-01, Report No. 14- 7479, dated May 21. Dear Mr. Bard, In accordance with the request of your pool engineer, this letter presents supplemental geotechnical recommendations the design and construction of the proposed pool at the subject property. The recommendations presented herein are based on our referenced reports and our review of the architectural design plans prepared by Brion Jeannette Architecture. This letter presumes the areas around the pool will be remedial graded with a 3 feet thick layer of soil cement. Earth pressure forces acting on the pool walls should be designed using an equivalent fluid density of 35 pounds per cubic foot for onsite beach deposits. These recommendations may be modified pending verification of soil conditions during construction. Surcharge loads, both topographic and structural, should be considered by the pool engineer. Exploratory drilling on nearby property encountered groundwater at depth of approximately 5 feet below ground surface. This groundwater level is anticipated to experience some fluctuation in response to the tidal cycle and/or during periods of heavy rain. The design groundwater level is recommended to be equal to the maximum predicted tide elevation during heavy rainfall, or an elevation of 7 feet (NAVD 88). Given the bottom of the pool is anticipated at elevation 10.35 feet, with a 12-inch thick shell, the base of the pool shell is approximately 2± feet above the April 29, 2020 Revised June 19, 2020 Project No: 72370-01 Report No: 20-8705R Page No: 2 anticipated high groundwater. Given the close proximity to a possible high groundwater condition, a hydrostatic relief valve may be recommended. If utilized, a gravel filled trench which extends parallel to the long dimension of the pool and connects to the hydrostatic relief valves should be provided. The gravel should be wrapped in filter fabric. Caisson foundations are being considered to support the proposed vanishing -edge pool to mitigate differential settlement. Caisson utilized for proposed pool support should be a minimum 24-inch diameter and embedded into competent bedrock a minimum depth of 5 feet. Caissons may be designed for a dead plus live load end bearing value of 8,000 pounds per square foot for bedrock. The values may be increased by one-third for wind and seismic forces. A skin friction of 300 pounds per square foot may also be utilized for bedrock. Lateral resistance may be computed utilizing 150 or 400 pounds per square foot per foot of depth for beach deposits or bedrock. Settlement of caisson foundations in bedrock is anticipated to be less than'/4 inch. Thank you for this opportunity to be of service. If you have any questions, please contact this office. Respectfully submitted, GEOFIRM \y�oRED GcrOZo \�N� KEVIN A. TRIGG NO. 1619 * CERTIFIED + * W Kevin . Tr l ENGINEERING J gg, GEOLOGIST / �� Zi Wang, R.C.E Chief gineering Geologi t, off= Senior Engineer, R.C.E. 8 OF cA0F Date Signed: 6 / 19 / 2020 KAT/ZW:np Distribution: Addressee Via Email NAIy�, _'v No. RCE 80199 Exp.09/30/20 �l =— m O T 11—' 801 Glenneyre St. • Suite F • Laguna Beach • CA 92651 (949) 494-2122 • FAX (949) 497-0270 April 29, 2020 Revised June 19, 2020 KAZ Investment Management c/o Brion Jeannette Architecture 470 Old Newport Boulevard Newport Beach, California 92663 Attention: Mr. Martin Bard APPROVAL OF THESE PLAZAS DC' H(D VATIOI J TO CO ST^ J`J VIP 1 H THE i' L ED '- Srl1UTE EX:'R%cS OR IMPLIED NG OF NE11; SE THE P, BFf UI;' 7HE - (SIGMA I Pi. LAVID 1VI / APPROVAL TO ISSUE BUILDING:___ I rct Nor-----7-2370=01 OCT ( Report No: 20-8705R 3 811 M.� Subject: Supplemental Geotechnical Recommendations for Proposed Pool New Single -Family Residence 3235 Ocean Boulevard Corona Del Mar, California References: 1. Geofirm, 2013, "Update Preliminary Geotechnical Investigation, Proposed New Single -Family -Residence, 3235 Ocean Boulevard, Corona del Mar, California", Project No. 71879-01, Report No. 13-7345r, dated September 12. 2. Geofirm, 2014, "Update Preliminary Geotechnical Recommendations for Project Design Revisions, Proposed New Single -Family Residence, 3235 Ocean Boulevard, Corona del Mar, California", Project No. 71879-01, Report No. 14- 7479, dated May 21. Dear Mr. Bard, In accordance with the request of your pool engineer, this letter presents supplemental geotechnical recommendations the design and construction of the proposed pool at the subject property. The recommendations presented herein are based on our referenced reports and our review of the architectural design plans prepared by Brion Jeannette Architecture. This letter presumes the areas around the pool will be remedial graded with a 3 feet thick layer of soil cement. Earth pressure forces acting on the pool walls should be designed using an equivalent fluid density of 35 pounds per cubic foot for onsite beach deposits. These recommendations may be modified pending verification of soil conditions during construction. Surcharge loads, both topographic and structural, should be considered by the pool engineer. Exploratory drilling on nearby property encountered groundwater at depth of approximately 5 feet below ground surface. This groundwater level is anticipated to experience some fluctuation in response to the tidal cycle and/or during periods-W heavy rain. The design groundwater level is recommended to be equal to the maximum predicted tide elevation during heavy rainfall, or an elevation of 7 feet (NAVD 88). Given the bottom of the pool is anticipated at elevation 10.35 feet, with a 12-inch thick shell, the base of the pool shell is approximately 2± feet above the April 29, 2020 Revised June 19, 2020 Project No: 72370-01 Report No: 20-8705R Page No: 2 anticipated high groundwater. Given the close proximity to a possible high groundwater condition, a hydrostatic relief valve may be recommended. If utilized, a gravel filled trench which extends parallel to the long dimension of the pool and connects to the hydrostatic relief valves should be provided. The gravel should be wrapped in filter fabric. Caisson foundations are being considered to support the proposed vanishing -edge pool to mitigate differential settlement. Caisson utilized for proposed pool support should be a minimum 24-inch diameter and embedded into competent bedrock a minimum depth of 5 feet. Caissons may be designed for a dead plus live load end bearing value of 8,000 pounds per square foot for bedrock. The values may be increased by one-third for wind and seismic forces. A skin friction of 300 pounds per square foot may also be utilized for bedrock. Lateral resistance may be computed utilizing 150 or 400 pounds per square foot per foot of depth for beach deposits or bedrock. Settlement of caisson foundations in bedrock is anticipated to be less than 1/4 inch. Thank you for this opportunity to be of service. If you have any questions, please contact this office. Respectfully submitted, GEOFIRM C9��s�LED GEococ �/- KEVIN A. TRIGG �� NO. 1619 h * CERTIFIED * w Kevin . Trigg, ENGINEERING / Z gg, GEOLOGIST ��Q Zi Wang, R.C.E Chief E gineering Geologi t,.oF `Fo�� Senior Engineer, R.C.E. 8 cA� Date Signed: 6 / 19 / 2020 KAT/ZW:np Distribution: Addressee Via Email y4�OFFE S/0N E 1� WAlyG, 'q!� I No. RCE 80199 Exp. 09/30/20