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HomeMy WebLinkAboutAPPROVED Soil reportHeadquarters 11345 U.S. Highway 1 Sebastian, FL. 32958 Orlando 723 Progress Way Sanford, FL. 32771 April 6, 2021 al 0 1 I ENGINEERING L117M AND TESTING Paul Charette 10380 SW Village Center Dr Port St. Lucie, FL 34987 Re: 633 SE Hidden River Drive Port St. Lucie, Florida KSM Project #: 211934-b Dear Mr. Charette: Mailing P.O. Box 78-1377 Sebastian, FL. 32978 Phone: 772-589-0712 C.A. # 5693 KSMengineering.net As requested, KSM Engineering & Testing has performed a subsurface investigation at the referenced site. Presentation of the data gathered during the investigation, together with our geotechnical related opinions, are included in this report. At the time of drilling, the riverfront site was sloped upward from the front of the property to the rear. The building areas were cleared prior to our investigation and the site had many trees remaining. Project Description: A two-story single-family residence, a one-story detached garage/guest house and a swimming pool are planned to be constructed on the site. Loads from the detached garage/guest house are planned to be transferred to the ground by a monolithic shallow foundation and loads from the two-story residence are planned to be transferred to the ground by shallow stemwall footings. We anticipate maximum wall loads for the structures will be less than 10,000 pounds per linear foot along the wall foundation for the residence and less than 5,000 pounds per linear foot along the wall foundation for the detached garage. Any individual column loads are assumed to be less than 25 kips. We estimate that several feet of site fill will be required to reach the desired grades. Site Investigation: The site investigation program consisted of performing six (6) Standard Penetration test borings (SPT), in the construction areas. The borings were terminated at depths of 10 to 40 feet below existing grade. The locations of the borings are shown on the attached location plan. Page 1 of 5 633 SE Hidden River Drive Port St. Lucie, Florida KSM Project #: 211934-b IV C 1 t ENGINEERING A%IJAVL AND TESTING The SPT boring was completed in accordance with procedures described in ASTM D 1586. A standard 1.5 inch I.D., 2 inch O.D. split -spoon sampler is driven into the soil by successive blows of a 140 pound hammer freely falling 30 inches. The number of blows required to drive the sampler 1 foot, after seating 6 in., is designated the penetration Resistance, or "N" value. At regular intervals the sampler is extracted from the ground and opened to allow visual examination and classification of the retained soil sample. Also, the groundwater table was allowed to stabilize and the depth of the groundwater elevation recorded from existing grade. The records of the soils encountered, the penetration resistances and groundwater level are shown on the attached logs. Engineering Evaluation and Conclusions: Based on the information obtained from this site investigation we are pleased to offer the following evaluation: The boring logs indicate the subsurface soils are not consistent across the site. In the locations of B-4 and B-5 (detached garage/guest house location) we encountered medium dense to dense fine-grained sand and some clayed sand. In location B-2 (northern section of the residence) we found mostly medium -dense fine-grained sand and some slightly silty sand. In the locations of B-1 and B-3 (pool and southern section of residence), however, an unsuitable layer of silty sand with organics, approximately 1 to 2 feet thick, was encountered. The layer was loose and was encountered at varying depths between 3 and 6 feet below existing grade. In the location of B-6 (center of proposed residence) we encountered a very loose layer of fine-grained sand below a depth of 10 feet. Please refer to the soil boring logs for specific information relative to the soil description. In order for a shallow foundation to perform satisfactorily, it must be able to support the structural loads with an acceptable factor of safety against excessive settlements; both total and differential. Due to the settlement potential of the very loose soil layer found in the area of the proposed residence, we do not recommend supporting the proposed residence on conventional shallow footings. The anticipated settlement, in our opinion, would be too excessive and beyond the general accepted safe limits for the structure. In the area of the proposed detached garage/ guest house, it is our professional opinion that the existing subsurface soils are suitable for a conventional shallow foundation. In order to avoid any damaging structural distress due to settlements, and based on past experience of other projects that had similar underlying subsurface conditions with similar loading conditions, we recommend the installation of a concrete pile supported foundation system for the proposed residence. The concrete piles will carry the structural loads below the weak soil layers. We recommend using auger cast -in -place piles. Based on the estimated structural loads provided, we assume that the following capacities will be sufficient to support the intended loading. Page 2 of 5 633 SE Hidden River Drive Port St. Lucie, Florida KSM Project #: 211934-b IV C 1 t ENGINEERING A%IJAVL AND TESTING Pile Specifications Pile Capacity Pile Diameter Pile Depth Allowable Uplift Lateral Load (kips) (in) (ft) (Kips) (Kips) 51 14 *30 30 5 64 14 *35 40 5 59 16 *30 35 6 71 16 *34 43 6 * Below Existing Grade All Piles should be installed and inspected in accordance to the recommendation published by the Auger Cast -In -Place Pile Committee of the Deep Foundation Institute. Piles should be placed at a center -to -center distance of not less than 3 pile diameters. The capacity of a pile group must be reduced depending upon the number of piles in the group and their respective position. A minimum time period of 12 hours should be specified for the installation of piles within 5 feet, center -to-center of each other. The minimum acceptable grout factor (actual grout volume divided by theoretical grout volume) should be 1.10. Site Preparation: The proposed building areas and areas to be paved, plus a minimum margin of five feet beyond the proposed construction shall be stripped and grubbed of surface debris, including vegetation, roots and organic matter. Any stumps shall be removed entirely. This is important on this site due to the amount of vegetation that must be removed. The building area should be graded level and proofrolled. Any soft yielding areas shall be excavated and replaced with clean compacted fill. Sufficient passes should be made during compaction operations to produce a density no less than 95 percent of its modified dry Proctor value (ASTM D 1557) to a depth of two feet. We do not recommend using heavy vibratory equipment on this site due to the proximity to the neighboring structures. After the exposed surface has been proofrolled, the building and pavement areas may be filled to the desired grades. The fill material shall consist of clean granular sand containing less than 10% material passing the U.S. Standard No. 200 mesh sieve. Place structural fill in loose layers of 12 inches in thickness and compact each lift to at least 95 percent of its modified dry Proctor value. After excavating for the footings, the disturbed footing subgrade should be recompacted to 95 percent (minimum) of its modified dry Proctor value. This can be best achieved by making several passes with a relatively light -weight walk -behind vibratory sled or roller. Page 3 of 5 633 SE Hidden River Drive Port St. Lucie, Florida KSM Project #: 211934-b IV C 1 t ENGINEERING A%IJAVL AND TESTING We recommend field density tests and on -site inspection be performed at appropriate times during the earth work operations in order to verify that the site preparations have been properly constructed. Foundation: Providing our recommendations for site preparation are followed, the proposed detached garage/guest house may be supported on conventional concrete, steel reinforced footings designed for an allowable soil bearing pressure of 2,000 pounds per square foot, or less. With the foundation properly designed and the site properly prepared, we anticipate total settlements less than % of an inch and differential settlements of less than '/4 of an inch. The majority of the settlement should occur during construction. This estimate is based on a minimum continuous footing width of 24 inches and and minimum 3 foot square pad footing, embedded a minimum of 16 inches. If the actual footing dimensions do not meet these minimum criteria, please contact our office so we can provide updated settlement calculations. Monolithic footings are very sensitive to eccentric wall loading and are notorious for producing differential settlements if not properly designed by the Structural Engineer. The soil pressure at the exterior edge of the footing should not exceed the specified allowable soil pressure and the soil pressure at the interior edge of the footing is always compressive (based on the principle of having no tension in the soil). Therefore, it is important to have the structural engineer verify the footer does not exceed the soil pressure given. As an alternative, the detached garage/guest house can be supported on a deep piling foundation system as well. Please see our pile capacity estimates above. Floor Slabs: A conventional slab -on -grade can be used in the "at grade" portion of any soil supported buildings. We recommend the disturbed subgrade below the floor slab be re -compacted to 95 percent of the modified Proctor maximum dry density (ASTM D 1557) prior to placement of the concrete. An estimated modulus of subgrade reaction of 150 pounds per cubic inch (pci) can be used for design of the slab -on -grade. We recommend that control joints be incorporated in the slab at frequent intervals to control shrinkage cracks. A moisture barrier is recommended beneath the floor slab to prevent moisture migration from the underlying soil resulting in dampness of the slab. Page 4 of 5 633 SE Hidden River Drive Port St. Lucie, Florida KSM Project #: 211934-b 'M IV C 1 t ENGINEERING A%IJAVL AND TESTING We believe the pool shell can be supported on a conventional pool foundation provided that the soft organic layer encountered from 4 to 6 feet below grade is removed from the pool bottom. This can be done by over excavating the pool and backfilling with 3/4" stone so that there is a firm layer of compacted stone extending from the bottom of the excavation to the bottom of the pool shell. We are estimating this will require the removal of approximately 6 feet of soils from existing grade. The rock shall be placed in layers of 12 inches thick and compacted with a small vibratory sled or "jumping jack" type compactor. Please note that granular fill should never be added on top of compacted stone. A visual inspection is also recommended to verify all unsuitable soils have been removed below the pool bottom. Provided that the site is properly prepared, the pool can be designed and constructed using an allowable soil bearing pressure of 2,000 pounds per square foot, or less. As an alternative, the pool can also be supported on a deep piling foundation. Please see our pile capacity estimates above. Closure: This report has been prepared in accordance with generally accepted soil and foundation engineering practice based on the results of the test borings and assumed loading conditions. This report does not reflect any variations which may occur between the borings. If variations appear evident during the course of construction, it would be necessary to re-evaluate the recommendations of this project. Environmental conditions, wetland delineation, karst activity, water quality, and municipal requirements are not a part of this report. We are pleased to be of assistance to you on this phase of your project. When we may be of further service to you or should you have any questions, please feel free to contact the office. Respectfully, Christop er S. LeBrun, E.I. Geotechnical Engineer Florida Lic. No. 1100022858 4/6/2021 This item has been electronically signed and sealed by Julie Keller, P.E. FI. Lic. 68366 on the date sta[etl directly t, [he right using a digital sign re. Printed copies of this tlocument are not nsidered signed and sealed and the signature must be verified on any electronic ,oPies Digitally signed by Julie Keller Date: 2021.04.10 15:41:31-04'00' Julie E. Keller, P.E. President Florida Lic. No. 68366 4/6/2021 JEK/jt E-mail to: Paul@charettearch.com; frank@southeastcontracting.com Page 5 of 5 KSM Engineering & Testing BORING NUMBER B-1 Box 78-1377 KSMP.O. Sebastian, FL 32978 PAGE 1 OF 1 Tel: (772)-589-0712 Fax: (772)-589-6469 CLIENT Paul Charette PROJECT NAME 633 SE Hidden River Drive PROJECT NUMBER 211934-b PROJECT LOCATION Port St. Lucie, Florida DATE STARTED 3/17/21 COMPLETED 3/17/21 GROUND ELEVATION HOLE SIZE inches DRILLING CONTRACTOR GROUND WATER LEVELS: DRILLING METHOD Split Spoon Sample AT TIME OF DRILLING 5.83 ft LOGGED BY SF & SR CHECKED BY Julie E. Keller, P.E. AT END OF DRILLING --- NOTES See Attached Location Plan AFTER DRILLING --- w o z A SPT N VALUE A U of >_ C0 w w 20 40 60 80 ~m w5 oz-j �w PL MC LL a 0 �J MATERIAL DESCRIPTION W g > Of D 7) Q m0> w 42 — -1 z Q o (� o-� z 0- U z v" } - 20 40 60 80 < Lu 0 Or- El FINES CONTENT (%) El 0 20 40 60 80 Brown Sand Gray Sand Light Brown Sand SS 2-3-5 (8) SS 5-6-7 Dark Gray Silty Sand with Some Organics (13) ....................................... 5 ...................................... SS 3-4-5 - Grayish Brown Sand with Traces of Roots (9) .... 3. SS 6-9-9 M (18) 10 Brown Sand SS 4-7-10 Q (17) W SS 8-9-9 z J Gray Clayed Sand (18) oSS 4-5-7 ......:............................... M (12) Bottom of borehole at 14.0 feet. N Lu W K W Y N U O 0 N Lu W J_ Y Y c� h 0 N R F ci 0] Q J 0 Z J d CD U W F O W cD KSM Engineering & Testing BORING NUMBER B-2 Box 78-1377 KSMP.O. Sebastian, FL 32978 PAGE 1 OF 1 Tel: (772)-589-0712 Fax: (772)-589-6469 CLIENT Paul Charette PROJECT NAME 633 SE Hidden River Drive PROJECT NUMBER 211934-b PROJECT LOCATION Port St. Lucie, Florida DATE STARTED 3/17/21 COMPLETED 3/17/21 GROUND ELEVATION HOLE SIZE inches DRILLING CONTRACTOR GROUND WATER LEVELS: DRILLING METHOD Split Spoon Sample AT TIME OF DRILLING 3.92 ft LOGGED BY SF & SR CHECKED BY Julie E. Keller, P.E. AT END OF DRILLING --- NOTES See Attached Location Plan AFTER DRILLING --- w o z A SPT N VALUE A U of > � w w 20 40 60 80 ~m _ w5 oz-j �w PL MC LL a 0 MATERIAL DESCRIPTION W g > D 7) Q w 42 — -1 z Q o J o_ Of 0— m 0 > v " } - 20 40 60 80 El FINES CONTENT (%) El (� < z Lu U z 0 Or- 0 20 40 60 80 Brown Sand with Traces of Roots Light Brown Sand 3-4-5 SS (9) Gray Sand SS 4-5-7 ............................... - (12) 5 ....................................... Dark Gray Silty Sand with Some Roots 3-5-7 o SS (12) d O O....................................... m Gray Sand 6.8_9 SS X (17) SS 7_7_9 0 10 .: (16) Bottom of borehole at 10.0 feet. Lu W z_ J_ O V M N Lu W K W Y N U O 0 N Lu W J_ Y Y M h 0 N R F ci 0] Q J 0 Z J d CD LLI F O W (OD KSM Engineering & Testing BORING NUMBER B-3 Box 78-1377 KSMP.O. Sebastian, FL 32978 PAGE 1 OF 1 Tel: (772)-589-0712 Fax: (772)-589-6469 CLIENT Paul Charette PROJECT NAME 633 SE Hidden River Drive PROJECT NUMBER 211934-b PROJECT LOCATION Port St. Lucie, Florida DATE STARTED 3/17/21 COMPLETED 3/17/21 GROUND ELEVATION HOLE SIZE inches DRILLING CONTRACTOR GROUND WATER LEVELS: DRILLING METHOD Split Spoon Sample AT TIME OF DRILLING 3.17 ft LOGGED BY SF & SR CHECKED BY Julie E. Keller, P.E. AT END OF DRILLING --- NOTES See Attached Location Plan AFTER DRILLING --- w o z A SPT N VALUE A U of >_ C0 w w 20 40 60 80 ~m w5 oz-j �w — -1 PL MC LL a 0 �J MATERIAL DESCRIPTION W g o-� > Of 0- D 7) Q m0> w 42 z Q - 20 40 60 80 o (� z U z v" } < Lu 0 Or- El FINES CONTENT (%) El 0 20 40 60 80 Brown Sand with Traces of Roots Gray Sand 3-4-7 SS (11) - Dark Gray Silty Sand with Some Organics 3-3-4 ....................... SS (7) Brown Sand, Slightly Silty with Roots 5 o ....................... Light Brown Sand 5-7-9 SS (16) Gray Sand SS 6-8-9 M ...::. (17) N.. ° 10 TSS 5-6 8 .... .............. .... Brown Sand 14 W SS 7-8-12 z J Gray Clayed Sand (20) o SS X 11-16-19 .................................... M (35) Bottom of borehole at 14.0 feet. N Lu W K W Y N U O 0 N Lu W J_ Y Y M h 0 N R F ci 0] Q J 0 Z J d CD U W F O W cD KSM Engineering & Testing BORING NUMBER B-4 Box 78-1377 KSMP.O. Sebastian, FL 32978 PAGE 1 OF 1 Tel: (772)-589-0712 Fax: (772)-589-6469 CLIENT Paul Charette PROJECT NAME 633 SE Hidden River Drive PROJECT NUMBER 211934-b PROJECT LOCATION Port St. Lucie, Florida DATE STARTED 3/17/21 COMPLETED 3/17/21 GROUND ELEVATION HOLE SIZE inches DRILLING CONTRACTOR GROUND WATER LEVELS: DRILLING METHOD Split Spoon Sample AT TIME OF DRILLING 2.50 ft LOGGED BY SF & SR CHECKED BY Julie E. Keller, P.E. AT END OF DRILLING --- NOTES See Attached Location Plan AFTER DRILLING --- w o z A SPT N VALUE A U of >_ C0 w w 20 40 60 80 ~m w5 oz-j �w PL MC LL a 0 MATERIAL DESCRIPTION W g > D 7) Q w 42 — -1 z Q o �J o-� 0- Of m0> v" } - 20 40 60 80 El FINES CONTENT (%) El (� < z Lu U z 0 Or- 0 20 40 60 80 Brown Sand SS 2-4-8 ....................................... Q (12) SS 10-12-16 Grayish Brown Sand (28)..................................... 5 SS 9-10-8 Gray Sand (18) 0 SS 9-8-9 m (17) N ° 10 SS 16-28-33 Gray Clayed Sand (61 ) W > SS 19-27-25 z...................................... (52) J SS 16-14-13 M (27) Bottom of borehole at 14.0 feet. N Lu W K W Y N U O 0 N Lu W J_ Y Y c� h 0 N R F ci 0] Q J 0 Z J d CD U W F O W cD KSM Engineering & Testing BORING NUMBER B-5 Box 78-1377 KSMP.O. Sebastian, FL 32978 PAGE 1 OF 1 Tel: (772)-589-0712 Fax: (772)-589-6469 CLIENT Paul Charette PROJECT NAME 633 SE Hidden River Drive PROJECT NUMBER 211934-b PROJECT LOCATION Port St. Lucie, Florida DATE STARTED 3/17/21 COMPLETED 3/17/21 GROUND ELEVATION HOLE SIZE inches DRILLING CONTRACTOR GROUND WATER LEVELS: DRILLING METHOD Split Spoon Sample AT TIME OF DRILLING 2.67 ft LOGGED BY SF & SR CHECKED BY Julie E. Keller, P.E. AT END OF DRILLING --- NOTES See Attached Location Plan AFTER DRILLING --- w o z A SPT N VALUE A U of >_ C0 w w 20 40 60 80 ~m w5 oz-j �w — -1 PL MC LL a 0 �J MATERIAL DESCRIPTION W g o-� > Of 0- D 7) Q m0> w 42 z Q - 20 40 60 80 o (� z U z v" } < Lu 0 Or- El FINES CONTENT (%) El 0 20 40 60 80 Brown Sand SS 3-5-7 ....................................... (12) Q SS 6-8-9 . Grayish Brown Sand (17) .................................... 5 ..... SS 14-20-16 Gray Sand (36) XSS 9-10-8 m (18) 010 SS 7-10-11 ...................................... (21) Bottom of borehole at 10.0 feet. Lu W z_ J_ O V M N Lu W K W Y N U O 0 N Lu W J_ Y Y M h 0 N R F ci 0] Q J 0 Z J d CD U W F O W cD 2 0 m m N Z 0 a W z KSM Engineering & Testing BORING NUMBER B-6 KSMP.O. Box 78-1377 PAGE 1 OF 2 Sebastian, FL 32978 Tel: (772)-589-0712 Fax: (772)-589-6469 CLIENT Paul Charette PROJECT NAME 633 SE Hidden River Drive PROJECT NUMBER 211934-b PROJECT LOCATION Port St. Lucie, Florida DATE STARTED 3/29/21 COMPLETED 3/29/21 GROUND ELEVATION HOLE SIZE inches DRILLING CONTRACTOR GROUND WATER LEVELS: DRILLING METHOD Split Spoon Sample AT TIME OF DRILLING 3.50 ft LOGGED BY SF & SH CHECKED BY Julie E. Keller, P.E. AT END OF DRILLING --- NOTES See Attached Location Plan AFTER DRILLING --- o 0 U a 0 �J (� MATERIAL DESCRIPTION L of ~m W g o-� < z o >_ w5 > Of 0- � C0 w oz-j D 7) Q m0> U z z L �w L 42 v" 0 — -1 z Q } - Or- A SPT N VALUE A 20 40 60 80 PL MC LL 20 40 60 80 El FINES CONTENT (%) El 20 40 60 80 Brown Sand with Traces of Roots Light Brown Sand SS 2-3-4 (7) 5 ............................. :....... ....................................... ° SZ Dark Gray Silty Sand with Some Roots SS 3-4-5 (9) ... Gray Sand °... Brown Sand, Slightly Silty with Roots SS 4-6-7 (13) Gray Sand ....................................... SS 5-8-8 (16) 10 ...................................... SS 6-8-8 (16) Brown Sand ....................................... SS 222 (4) 15 Gray Sand ...................................... ...................................... SS 3-3-2 (5) 20 = Brown Sand, Slightly Silty and Slightly Clayed — _ ......:.......:.......:.......:....... SS 2-1-2 (3) 25 = Light Gray Silty Sand ............................... SS 4-5-3 (8) 30 SS 3-3-4 (7) 35 (Continued Next Page) KSM Engineering & Testing BORING NUMBER B-6 Box 78-1377 KSMP.O. PAGE 2 OF 2 Sebastian, FL 32978 Tel: (772)-589-0712 Fax: (772)-589-6469 CLIENT Paul Charette PROJECT NAME 633 SE Hidden River Drive PROJECT NUMBER 211934-b PROJECT LOCATION Port St. Lucie, Florida L o z A SPT N VALUE A U Of >_ W w L 20 40 60 80 ~m w5 0z-j �w H� PL MC LL o a 0 MATERIAL DESCRIPTION W g > Cl D Q L z 0` 0 J C 0 m 0> v"}- 20 40 60 80 (D < z � U z 0 Of El FINES CONTENT (%) El 35 20 40 60 80 Light Gray Silty Sand (continued) ...................................... Light Gray Sand, Slightly Silty with Shell Fragments O ° ..... . ....... :.............. :....... SS 12-13-4 40 (17) Bottom of borehole at 40.0 feet. fN0 P/X NAK� I l�ll n' $ , LOT a G RES NCE FINISH FLOOR EL. 8J0' z ca � d ` �♦ �`. ^. §$ y ma�j2_ S + ti ti 5 .s' 3 i v siaaaz• ,s e e O - ---'----- --- ---ro .Es S�T�Y _-�-;------a B-5 ` xo s°TS • \ ts1 FFFf�A' N 31 59 CE a� ® pia r � ., `h.�3o.� ' 1� C v . \ LOT 5 \\LOCK 1 In \ �. NgCANT) ____mod' Fez, x r z, • sd '• crr vza aNr o� r s�zvrm w o' �q •. i s e w xnx °ua�o nam fwa fro 5/q9�' �x(�e0iocrc °'ior .;x A rauP Te wde! 6 c r a' I LOT 6 CXIS77NG RESIDENCE FINISH FLOOR EL. 9.00' LOCATION OF SOIL BORINGS PROJECT: 633 SE Hidden River Drive, Port St. Lucie, Florida DRAWN BY: C.V. SHEET 1 OF 1 ENGMEERING PERMIT #: As DESIGNED BY: J.K. PROJECT #: 211934-b ikfL AND TESTING DATE: 20210322 SCALE: NONE