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Home My WebLink About2002 Blue Yonder Way - Special Inspections/Engineering - 08/23/2013Zv d 2 fat V • `�1Tassenaar 2180 South Ivanhoe Streit, Suito 5 Denver, Colorado 80222-5710 303-759-8100 Fax 303-756-2920 Geotechnical and Environmental Consultants www.agwassenaar.com August 23, 2013 D R Horton 9555 South Kingston Court, Suite 200 Englewood, Colorado 80112-5943 Attention: Mr. Tim Karns Subject: Soil and Foundation Study Proposed Residential Structure Lot 1, Block 5 Sidehill, Filing 2 Fort Collins, Colorado Project Number 131315 Purpose As requested, we have performed a soil and foundation study at the subject site. The purpose of our study was to observe subsurface conditions encountered and to recommend geotechnical design criteria for the design and construction of the foundation for the proposed residence. Additionally, we reviewed partial "Construction Observation and Testing" reports (Earth Engineering Consultants, LLC, Project Number 1124098, dated December 28, 2012 and May 1, 2013) as a portion of our analysis. This letter presents a summary of our findings and recommendations. Subsurface Conditions The field exploration included drilling a 4-inch diameter auger boring near the center of the lot in the upper level to a depth of approximately 24 feet. The subsurface materials encountered consisted of: 0' to 13' Fill, clay, stiff, silty, sandy, with scattered gravel, moist, mottled brown 13' to 16'/z' Clay, soft, silty, very sandy, very moist, brown to reddish brown 16'/z' to 24' Sand and Gravel, dense, silty, slightly cobbly, very moist to wet, brown Date of drilling: June 28, 2013 Depth to water: 17 feet at the time of drilling 17 feet 3 days after drilling Laboratory Testing Samples obtained during drilling were returned to the laboratory. They were visually classified and testing was assigned to selected samples in an effort to evaluate the engineering properties of the subsurface materials encountered. Site specific laboratory swell/consolidation tests A.G. Wassenaar Geotechnical and Environmental Consultants NOTES: 1. DRAIN MUST SLOPE TO A POSITIVE GRAVITY OUTLET AND/OR TO SUMP WHERE WATER CAN BE REMOVED BY PUMPING 2. SLOPE BOTTOM OF TRENCH AND PIPE AT A MINIMUM OF 1/8" PER FOOT (i.e. 1 %) OR AS APPROVED BY THE GEOTECHNICAL ENGINEER 3. 4-INCH DIAMETER RIGID PERFORATED PVC PIPE (ASTM D2729 MINIMUM SCHEDULE 20), OR SUBSTITUTE APPROVED BY GEOTECHNICAL ENGINEER 4. GRAVEL SPECIFICATION: 2" MINUS WASHED ROCK/GRAVEL, POORLY GRADED WITH NO MORE THAN 30% PASSING THE 3/8" SIEVE AND NO MORE THAN 10% PASSING THE #4 SIEVE, OR AS APPROVED BY THE GEOTECHNICAL ENGINEER SLIP JOINT CONCRETE SLAB ON GRADE BACKFILL DO NOT EXCAVATE WITHIN A 1:1 LINE — EXTENDING DOWN AND AWAY FROM EDGE OF FOOTING. MAINTAIN THIS ANGLE OF EXCAVATION TO A DEPTH OF TWICE THE FOOTING WIDTH. 5� 1 INDATION MINIMUM 10 MIL POLYETHYLENE BARRIER OR WALL EQUIVALENT APPROVED BY GEOTECHNICAL ENGINEER. ATTACH TO WALL AFTER DAMPPROOFING AND EXTEND AT LEAST 1 FOOT UP ON WALL AND BENEATH FLOW LINE OF PIPE. BACKFILL NON -WOVEN GEOTEXTILE FILTER FABRIC (MIRAFI 140N OR EQUIVALENT APPROVED BY GEOTECHNICAL ENGINEER) PLACED ACROSS ENTIRE WIDTH OF DRAIN GRAVEL. DRAIN GRAVEL (SEE NOTE #4) GRAVEL SHOULD FILL ENTIRE TRENCH AND EXTEND LATERALLY TO TOP OF FOOTING. GRAVEL COVER ABOVE PIPE SHOULD BE AT LEAST 4" 8" MINIMUM FOOTING FOUNDATION TYPICAL EXTERIOR DRAIN DETAIL FTG 3 EXT-SOG SEPTEMBER 2007 FIGURE 2 EXTEND POLYETHYLENE TO OUTSIDE EDGE OF BOTTOM OF TRENCH. DRAIN PIPE - (SEE NOTES #2 & 3) AT LOCATION OF HIGH POINT, ESTABLISH BOTTOM OF DRAIN PIPE AT LEAST 4" BELOW BOTTOM OF FOOTING OR PAD A.G. Wassenaar Geotechnical and Environmental Consultants 1. 3-INCH OR 4-INCH DIAMETER RIGID PERFORATED PVC PIPE (ASTM D2729 MINIMUM SCHEDULE 20), OR AN APPROVED SUBSTITUTE. WRAP PIPE WITH GEOTEXTILE FABRIC (MIRAFI 140N OR EQUIVALENT) 2. GRAVEL SPECIFICATION: 2" MINUS WASHED ROCK/GRAVEL, POORLY GRADED WITH NO MORE THAN 30% PASSING THE 3/8" SIEVE AND NO MORE THAN 10% PASSING THE #4 SIEVE, OR AS APPROVED BY THE GEOTECHNICAL ENGINEER REMOVABLE WINDOW WELL COVER WINDOW WELL WINDOW WELL COMPACTED BACKFILL 2 MINIMUM 0 czf:> �=). 0 C) 0 0 oo 00 12" 000 0 MINIMUM D u �) - - 0 0 0 0 GRAVEL 0 (SEE SPEC. 2) 0 SLOPE TO 0 DRAIN PIPE 0 ATTACH TO RECOMMENDED DRAIN SYSTEM WITH SOLID PVC DRAIN PIPE (SEE SPEC. 1) PIPE (SPEC. 1) IF INTERIOR DRAIN, PIPE TO BE COVERED BY ABOUT 2" SLOPE AT 1% TO DRAIN. OF GRAVEL. COVER END WITH GRATE OR PERFORATED CAP. WINDOW WELL MAY 2013 WINDOW WELL DRAIN DETAIL FIGURE 3 No Text No Text No Text No Text No Text No Text No Text . A.G. Wassenaar , ' � ' . Geotechnical and Environmental Consultants • C• F,�::,�� f_i `�; ....,\ ., r—� � {I I F t,�,., �',�� 4i� fr� ,�:.._� 3� ,`� � (E�r� l~-� e •,:.. ,. :, , 'd-` � `,� t ;� � � l.;� ) "��l '� !'�� _� 9 1 , ,. M:i �y /.:' ��.m . �4:.3` l 'i �� :,� ��_J ...=J -"r �:�.;%� i.r C� NOTES: , 1. DRAIN MUST SLOPE TO A POSITIVE GRAVITY OUTLET AND/OR TO SUMP WHERE WATER CAN BE REMOVED BY PUMPING �� //�\ 2 MIMMUM OF�1 8"PER FOOT�eNDo�jPE AT A � � �� // OR AS APPROVED BY THE GEOTECHNICAL ENGINEER ///\ � 3. 4-INCH DIAMETER RIGID PERFORATED PVC PIPE(ASTM D2729 MINIMUM SCHEDULE 20),OR FOUNDATION SUBSTITUTE APPROVED BY GEOTECHNICAL ENGINEER WALL 4. GRAVEL SPECIFICATION:2"MINUS WASHED ROCK/GRAVEL, POORLY GRADED WITH NO MORE THAN 30%PASSING THE 3/8"SIEVE AND NO MORE THAN 10%PASSING THE#4 SIEVE,OR AS APPROVED BY THE GEOTECHNICAL ENGINEER MINIMUM 10 MIL POLYETHYLENE BARRIER,OR gACKFILL EQUIVALENT APPROVED BY GEOTECHNICAL ENGINEER.ATTACH TO WALL AFfER DAMPPROOFING AND EXTEND AT LEAST 1 FOOT UP ON WALL AND BENEATH FLOW LINE OF PIPE. NON-WOVEN GEOTEXTILE FILTER FABRIC (MIRAFI 140N OR EQUIVALENT APPROVED BY GEOTECHNICAL ENGINEER)PLACED OVER ENTIRE WIDTH OF DRAIN GRAVEL. FOUNDATION VOID SPACE DRAIN GRAVEL(SEE NOTE#4). FILL ENTIRE TRENCH WITH GRAVEL AND EXTEND TO TOP OF VOID. MINIMUM GRAVEL COVER OF 4"IS REQUIRED. i SLIP JOINT CONCRETE SLAB , . .�,•:•:'0:�:;Q::� �::::�:�::;. ::.a:o:Q:��: ,,,,��,,,,,�%,,,�,,,,v,%��%%��%%��%%�� o:. �:.:...o..�;;;.,.;: ..�:�-::... DRAIN PIPE-(SEE NOTES#2&3 �" '�' AT LOCATION OF HIGH POINT, '�'�' � Q! ESTABLISH BOTTOM OF DRAIN DRILLED PIER PIPE AT LEAST 8"BELOW ' BOTTOM OF VOID 8�� MINIMUM EXTEND POLYETHYLENE TO OUTSIDE EDGE OF BOTfOM OF TRENCH PIER FOUNDATION PIER-3 EXTSOG TYPICAL EXTERIOR DRAIN DETAIL SEPTEMBER 2007 FIGURE 1