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1998-04-13 Excavation Observations and Compaction TestingA Excavation Observations and Compaction Testing Report for Pilot Land Development Company Center Oaks Second Addition Albertville, Minnesota cf'ou et 040's. d ww�� " 004 Project BDXX-97-309D April 13, 1998 Braun Intertec Corporation d "� �, �.0 � . �� ��.' � , ��d ..� B RAU K' I NTE RTEC April 13, 1998 Mr. Don Jensen Pilot Land Development Company 13736 Northeast Johnson Street Ham Lake, MN 55304 Dear Mr. Jensen: Braun Intertec Corporation 6875 Washington Avenue South P.O. Box 39108 Minneapolis, Minnesota 55439-0108 612-941-5600 Fax:942-4844 Engineers and Scientists Serving the Built and Natural Environments Project BDXX-97-309D Re: Excavation Observations, Compaction Testing and Final FHA/HUD 79g Lot by Lot Tabulation, Center Oaks Second Addition, Albertville; Minnesota This report summarizes our construction testing services performed during the 1997 site grading at the Center Oaks Second Addition development. The purpose of the excavation observations was to aid in evaluating the suitability of the soils encountered in the excavation bottoms for fill, house and roadway support. The purpose of the compaction testing was to aid in evaluating the suitability of the engineered fill placed for house and roadway support. Available Information We were provided with "Street and Utilities Improvement Project Construction Plans" dated August 19, 1997, and "Grading Improvement Project Construction Plans" dated August 22, 1997, last revised October 8, 1997, prepared by Meyer-Rohlin, Inc. Braun Intertec previously performed a geotechnical evaluation for the Parkside 4th Addition, Center Oaks and adjacent commercial parcels. Two soil borings were performed within the Center Oaks Second Addition development. Please refer to our report dated November 21, 1996, project BABX-96-816. In addition, a geotechnical exploration for Center Oaks Addition was performed by Independent Testing Technologies. Eight soil borings were performed within the addition. Their report, Project 97-363, dated September 18, 1997, was also used as a reference for our recent observations. Proposed Construction The development will consist of constructing 108 house pads with associated roadways and utilities. The houses will have shallow to deep basements with masonry or concrete bearing walls and wood -frame construction. We assume the houses will be supported by typical frost depth spread footing foundation systems with bearing pressures that will not exceed 2,000 pounds per square foot. Excavation Observations Excavation observations were performed by an engineering assistant between September 19 and November 14, 1997. Our observations were performed on an on -call basis as scheduled by the excavating contractor, D & M Excavating. During the site grading, the excavating contractor typically stripped topsoil and soft clays from the house pads and roadways using dozers, scrapers and backhoes. Excavation bottom elevations and oversizing measurements were referenced to site staking set by others. Measured dimensions were made with a 100-foot tape and elevations were taken Pilot Land Development Company Project BDXX-97-309D April 13, 1998 Page 2 with a hand-held eye level, referenced to the site staking provided. The staking of the house pads and roadways were performed by the excavating contractor based on staking set by Meyer-Rohlin. The exact locations of the graded house pads and roadways are the responsibility of the excavation contractor. Visual observations were performed to aid in determining the suitability of the soils encountered in the excavation bottoms. In addition to observing the excavation bottom and sidewall soils, we performed random hand auger borings and static cone penetrometer tests up to 3 feet deep. The soils exposed and retrieved were classified in general accordance with American Society for Testing and Materials (ASTM) D. 2488 procedures. Estimates were made of the soil strength properties by judging the force required to advance the auger, and readings obtained with the static cone penetrometer. The soils encountered in the excavation bottoms consisted of sandy lean clay and lean clay. Based on the hand auger probes and penetrometer tests performed in the excavation bottoms, we judged the clays to be in a medium to rather stiff condition. Fill Lots Table 1 summarizes the lots which required the placement of fill to reach house hold down grades after topsoil and/or soft clays were removed. Table 1. Fill Lots Block Lot 1 1 and 2 2 1 and 2 4 3 and 4 5 16 to 21 6 1, 5 to 10 and 15 to 33 7 1 to 26 Cut Lots Table 2 summarizes the lots which were cut to reach house hold down grades. Several of the proposed house pads required engineered fill to establish garage floor slab grade only. Table 2. Cut Lots Block Lot 2 3 to 19 3 1 to 3 4 1 and 2 5 1to15 6 2 to 4 and 11 to 14 Pilot Land Development Company Project BDXX-97-309D April 13, 1998 Page 3 We assume these lots will require a cut into natural soils to establish footing grade. The contractor did not need to expose the soils at footing grades in these areas to establish proposed finished grades. Therefore, observations of the soils at proposed footing grade were not completed. During excavation for the footings on these lots, we recommend that a geotechnical engineer evaluate these soils prior to the placement of forms or footings. Compaction Tests Engineered fill soils placed to establish building and roadway grades typically consisted of lean clay and sandy lean clay. Fill was typically placed in 6- to 12-inch lifts with dozers or scrapers, then compacted with a self-propelled vibratory sheepsfoot compactor. A total of 38 compaction tests were performed in the engineered fill placed in the building pads. All tests met or exceeded the minimum density requirement of 95 percent of the soil's standard Proctor dry density (ASTM D 698). The results of the compaction tests and Proctor test curves were previously submitted and are attached to this report. Lot by Lot Tabulation The attached Final FHA/HUD 79g Lot by Lot Tabulation outlines the applicability of each lot within the Center Oaks Second Addition development. As indicated in the comments section of the attatched Lot by Lot Tabulation, we recommend that compaction tests be performed during house construction at several house locations. Our services were performed on a part-time basis and the engineered fill placed at these house locations were not tested during the site grading. Cold Weather Construction If site grading and construction is anticipated during cold weather, we recommend that good winter construction practices be observed. All snow and ice should be removed from cut and fill areas prior to additional grading. No fill should be placed on soils which have frozen or contain frozen materials. No frozen soils should be used as fill. Concrete delivered to the site should meet the temperature requirements of ASTM C 94. Concrete should not be placed upon frozen soils or soils which contain frozen material. Concrete should be protected from freezing until the necessary strength is attained. Frost should not be permitted to penetrate below footings bearing on frost -susceptible soil since such freezing could heave and crack the footing and/or foundation walls. Summary Based on the results of the soil borings, excavation observations and hand auger probes, it is our opinion the soils encountered in the observed excavation bottoms are suitable for fill, house and pavement support. Based on the staking provided by others, it appears the observed excavations were adequately oversized for fill, house and pavement support. Based on the results of our compaction tests, it appears the contractor's methods produced engineered fill soils that are suitable for house and pavement support. Pilot Land Development Company Project BDXX-97-309D April 13, 1998 Page 4 We recommend compaction tests be performed during house construction at the house locations referenced on the attached Lot by Lot Tabulation. General Remarks The graded house pad locations are shown on the previously described "Grading Improvement Project Construction Plans." We recommend the houses be constructed within the graded house pads as shown on the plan indicated above. A house situated on a lot that is not located within a corrected pad location may not be founded on suitable soil or have adequate oversizing for lateral support of the fill and foundation loads. If the builder is unsure as to the location of the corrected pad, or is suspicious as to the suitability of the foundation soils, we should be contacted to assist in locating the building pad and suitable foundation soils. No established national standards exist for excavation observations. We have used the methods and procedures described in this report. Other firms may use different procedures to evaluate bottoms of excavations. Services performed by Braun Intertec for this project have been conducted with that level of care and skill ordinarily exercised by members of the profession currently practicing in this area under similar budget and time restraints. No warranty, expressed or implied, is made. Thank you for using Braun Intertec. If you have any questions or require additional information, please call Jim Vos at (320) 253-9940 or John Carlson at (612) 942-1783. S' cerely, ro� James G. Vos Senior Engineering Assistant Professional Certification I hereby certify that this plan, specification, or report was prepared by me or under my direct supervision and that I am a duly Registered Professional Engineer under the laws of the State AAof'' _Minnesota. John T. Carlson, PE Senior Engineer Registration Number: 20663 Attachments: Final Lot by Lot Tabulation (4) c: Mr. Dave Backes; D & M Excavating Mr. Scott Dahlke, PE; Meyer-Rohlin, Inc. jgv\j tc: drb\bdxx\rpt\97309d.1 j� f- CNP O O "I0- v 0,In C C1 m m M to O V)O u) m m L '�+ �Y a! a! a! al N al a! 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