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Report
12/ FRI 09:14 FAX 503 670 9147 CARLSON TESTING U001 Car G fin • • • Main Office Salem Office Bend Office • • • • • • • • • P.O. BOX 23814 4060 Hudson Ave., NE P.O. BOX 7918 A Oivision of Carlson Testing, Irt. • • • • • • • Tigard, Oregon 97281 Salem, OR 97301 Bend, On 97708 Geoteohnical Consulting Phone (503) 684 -3460 Phone (503) 589 -1252 Phone (541) 330 -9155 Construction Inspection and Related Tests FAX (503) 670 -9147 FAX (503) 589 -1309 FAX (541) 330 -9163 • •• • • • •• • • • • • • • • • • • • • • • • • • • December :2012002 •: • • . .. FT ,2 az j DMZZ sp./ 14,100 5`F Albert Shields ... • • • • .. City of Tigard Gocj Enforcement 13125 SW I lallApirlvva(d: : �: :. • Tigard, Oregon 97223 Mr. Shields, The purpose of this letter is to provide you with information regarding the rebuilding of the rockery walls on lots 2 through 10 of the Erickson Heights Subdivision. We have provided Renaissance Homes with a rockery wall design and a confirming agreement to observe the reconstruction of the rockery walls. Provided our confirming agreement is signed and returned to our office prior to the commencement of work, Carlson • Geotechnical will observe the reconstruction of the walls. The general plan for reconstruction the walls is to remove each wall, excavate subgrade soils to firm material, and rebuild the wall in accordance With our rockery wall design. Once a particular wall is removed, we will observe the subgrade soils and make the proper recommendation for over excavation of the subgrade. Once the subgrade is over excavated, we will observe the keyway, foundation rock, and placement of the wall drain. We will also observe compaction of the backfill aggregate, footing to slope (or adjacent wall) set backs, and wall batter. Provided these items are performed in accordance with our recommendations, we will provide a final letter of rockery wall observations to the City of Tigard and Renaissance Homes. If you have any further questions or comments, please contact our office. Brian C. Ranney, G.I.T. Geotechnical Staff • • larlson Geotechnical Main Office Salem Office Bend Office • •* • • • • • • • • • P.O_ Sox 23814 4060 Hudson Ave., NE P.O. Sox 7918 • A Division cf Carlson Testhg, i114: • • : • • • : • : : • : Tigard, Oregon 97281 Salem, OR 97301 Band, OR 97708 Geoteohnioal Coil suiting • • • • • • • • • • Phone (503) 684.3460 Phone (503) 589.1252 Phone (541) 330 -9155 Construction Inspection an: Piaia:ed Teas : : • • • • • FAX (5081870 -9147 FAX (503) 589 -1309 FAX (541) 330.9163 • • ••• • • • • • • • • • • • • • • • • • • • • • • • • December 1, �' /02 • • • • ... ... • ••• • ••• Mr. Steve Hunt Renaissane +dies. • • • •. :• . : •. • 1672 SW Wtlamtrttef.4114IXivt West Linn, Qreg4rl 97pt8 : : : : • • Confirming Agreement for Construction Observation Services Erickson Heights Rockery Walls Lots 1 - SW Kable Street Tigard, Oregon INTRODUCTION Carlson Geotechnical is pleased to submit this confirming agreement to observe the re- building of the upper rockery walls on lots 1 through 10 of the Erickson Heights Subdivision in Tigard, Oregon. We have performed numerous observations of these rockery walls, the results of which were presented in our Summary Report of Rockery Wall Observations dated October 25, 2002. In that report we recommended that the upper walls be re - built, and we provided a general detail and written recommendations for rebuilding the rockery walls. PURPOSE AND SCOPE The purpose of our geotechnical construction observation services will be to confirm that the rockery walls are re -built In accordance with the recommendations contained in our Summary Report of Rockery Wall Observations. Our specific scope of services will include the following: • Observe rockery wall subgrade soils. • Observe boulder placement • Observe wall backfill compaction. • Observe wall batter. • Maintain periodic documentation of the construction activities and provide field reports to Renaissance Homes and the City of Tigard. • Submit a final letter of compliance regarding geotechnical- related activities. FEE ESTIMATE It is difficult to accurately estimate our total construction observation fees because our involvement will depend on the rate at which construction proceeds, weather conditions, and the number of site visits required. We anticipate that our services will be required on a part -time, v • • • • .. • . • . • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • . . • .. • • • . • • • • • • • • • • • . . • • • • • . . Erickson Heignts Lots 1 -10 Tigard, Oregon Decemneri7 • .• •4 •.• ••• • • • • . • • • • • • • • • • • • • • ... • ... on -call basis during earthwork operations; however, we are prepared to perform full time observation.at yotir raclue3t. .. •. • • • For budgetdry r oses, Sivd havb 3sgumed that each part-time visit will require a total of 3 hours and will cost approximately $325 each. Each full time visit will require a total of 8 hours and will cost approximately $650.00 each. This cost estimate includes vehicle mileage, and preparation and review time for field reports. Our construction observation services will be conducted by a member of our geotechnical staff and will be billed on a time - and - expense basis. All charges will be provided in accordance with the attached Schedule of Charges and Terms and General Conditions for Geotechnical Services. We are prepared to maintain a high level of communication with the involved parties to keep dose control of estimated and actual demand for our construction observation services. Satisfactory earthwork performance depends to a large degree on the quality of construction. Sufficient observation of the contractor's activities is a key part of determining that the work is completed in accordance with the construction drawings and specifications. Subsurface conditions observed during construction should be compared with those encountered during subsurface explorations, and recognition of changed conditions often requires experience. We recommend that qualified personnel visit the site with sufficient frequency to detect whether subsurface conditions change significantly from those observed to date and anticipated in this report. We recommend that rockery wall subgrades, placement of boulders, drain placement, wall batter, and compaction of wall backfill be observed by the project geotechnical engineer, or their representative. SCHEDULE Because observation is typically performed on an on -call basis, this agreement assumes that the earthwork contractor is held contractually responsible for scheduling observation. Observations should be scheduled a minimum of 24 hours in advance of when you would like the observation to be performed. • CLOSURE We appreciate the opportunity to submit this proposal and look forward to working with you on this project. Please formally provide your authorization of the work described herein by signing a copy of this proposal and returning it to our office. At your request, upon receiving written Carlson Geotechnical Page 2 of 3 ! ' ,, • • • a. • • •• • • • • •• • • • • • • • • • • • • • • • • •• • • • • - • • ••• • •• • • • • • • • • • • • • • • • • • • • •• Erickson Heights Lots 1 -10 Tigard, Oregon December 4 4 , 202• ••• •. •• • _ • • • • • • • • • • . • • • • • • • • • • • • • • • • • • ••• • • • • • • • • ••• authorization to proceed, we will notify the City of Tigard by letter to inform them that we have been retained !q •olvervg• q rg- Viiding of the walls. Please feel free to call if you have any questions oS' regifireiaddatiin�l •inforrraation. . . ........ • ••• • • Sincerely, CARLSON GEOTECHNICAL Brian C. Ranney, G.I.T. Geotechnical Staff • • JA..- ne M. -Niemer, P.E. 6 • sal Geotechnical Engineer • A' . ments: Terms and General Conditions for Geotechnical Services a k x * * * k k ' k x k q : t k * * I( *****w * * * * * * Of *k4 * k■ *•** fr* it kit*• k The terms and conditions of this etter are hereby accepted, and authorization to proceed with the above scope of work is give ` by the following signature. l have secured or verified right -of- entry for this w. k. • 1 ■1 • By _.i n Date /2/2°2AZ-- , . Mr • Firm 74r ) I s Doc ID_ P: \GEOTEO1- flProjects (Engrec)%2001 Projects!Erickson Heights Subdivision\connrming agreement re -build rock walls.DOC • Carlson Geotechnical Page 3 of 3 • Carlson � [, ® �,., 4I. Main Box 2 3 8 1 Salem Office Bend Office s i. • • • P.O. Box 23814 4060 Hudson Ave., NE P.O. Box 7918 A Division of Carlson Testing, MI . • . • • • : : • : :Tigard, Oregon 97281 Salem, OR 97301 Bend, OR 97708 • Geotechnical Consulting • • • • • • • • • • Phone (503) 684 -3460 Phone (503) 589-1252 Phone (541) 330-9155 Construction Inspection and Rei tea TLsts • • • • • • FAX (503) 670 -9147 FAX (503) 589 -1309 FAX (541) 330 -9163 • • •• • • • • CGT No. G010186/.t • • • • • • • Permit No. Unavailable •• • • : : FIELD OBSERVATION REPORT ••• ... • • •• •• • • • • • • • • • • • • DATES COVERED: : : ©ctole:2: • 20D2: PROJECT: : •:• teas& G1e:gt teSubdivision - Lot 6 ADDRESS: 10722 SW Kable Street, Tigard, Oregon BY: Brian Ranney, G.I.T. WEATHER: Cloudy, -60 °F PURPOSE OF VISIT: Rockery Wall Observation Carlson Geotechnical (CGT) Geotechnical Staff, Brian Ranney, arrived on site at 8:30 am as requested by Steve Hunt of Renaissance Homes (RH). The purpose of my visit was to observe the rockery walls located in the back of lot 6. At the time of my observations, the residence was complete. The backyard of the residence had been landscaped, and a patio and flagstone walkway /wall had been constructed behind the residence. Three rockery walls had been constructed in the backyard of the lot. The upper wall consists of a flagstone wall that ranged between approximately 1 and 2 feet high, and had no batter. This wall is also a walkway that borders the flat backyard portion of the residence. The second wall (down slope from the first wall) is a rockery wall that ranged between approximately 3 and 4 feet high, and had a batter that ranged from vertical to approximately 1 H:4V. The wall backfill consisted of silt. Using a ' /2 inch diameter foundation rod, I could probe the backfill the entire length of my probe (4 feet) with relative ease. The boulders generally were not embedded into the subgrade. I did not observe a drain behind this wall. The stacking of the boulders in this wall was generally good. The third wall was approximately four feet high, and generally had a batter of approximately 1 H:4V. The wall was backfilled with 2 inch minus aggregate that was generally medium dense (as determined by probing). The boulders were embedded into the subgrade, and the stacking of the boulders was generally good. There is no surcharge on this wall by adjacent structures, however a slope that ranges from roughly 1.5H:1V to 3H:1V is located above the wall, between the second and third rockery walls. The fourth rockery wall was constructed much like the third wall. The wall was also approximately 4 feet high, had a batter of approximately 1 H:4V, and was backfilled with 2 inch minus aggregate. The bottom course of boulders were embedded into the subgrade, and the stacking of the boulders was generally good. No surcharge is being applied to this wall. I left the site at 8:45 am. Brian C. Ranney, G.I.T. Jeanne M. Niemer, P.E. Geotechnical Staff Principal Geotechnical Engineer Note: Our reports pertain to the locations observed at the time of our visit only. Information contained herein is not to be reproduced, except in full, without prior authorization from this office. DISTRIBUTION: Steve Hunt, Renaissance Homes. Fax: (503) 670 -8663 Steve Hunt, Renaissance Homes. Fax: (503) 656 -1601 01/02/03 THU 11:07 FAX 503 670 9147 CARLSON TESTING rpjuuz • •• •• •• r.• • • • •• • • .• •. • • • • • • i ••• • • • • • • • • • • • • • • • • • • • ROCK SSE SIN- TEDULE -2 50D + 250) LBS. ROCKERY WALL DESIGN • •H (Ft) M114. .W? SLBS)• • - Pi'I ICAL SIZE Oft) MAXIMUM WALL HEIGHT (H) = 4 FEET • • • • • • • • • • • • • 9 4X26X18 DRAWING NOT TO SCALE • 4 ••• • 1 ,SRa • 25X25 X25 • . ••• • 1,Q00 .. •• 28X25X • _ _ • . _ • 22X22X22 • LEVEL TO 2H:1V MAX. SLOPE • • 22 X 19 X 14 iiii .•. . :•• :•: 18 X 18 X 18 COMPACTED SILT , ' OR CLAY SOIL _� (12 to 24 INCHES `` THICK) t ,. ) O. r s N - - - - -, �. _ .� � • :, STABLE TEMPORARY CUT N ?-'.1"Pl. 4 ±1 MIN. WT. °° °,O ° QOe (SLOPE ANGLE VARIES) 250D +250 4 ° = 0 C ° 4 " -0 CRUSHED AGGREGATE, �s�g� ['L 9 °° 9 ° COMPACTED IN 12 INCH LIFTS 0.35H ` o�li °�� a I RE98 - r,..,' .1. 1 1/2 " -0 CRUSHED AGGREGATE ;'...:4 �° WITH NO MORE THAN 7% FINES PASSING THE No. 200 SIEVE, " 1 v. Tip • LIGHTLY TAMPED / JAN 0 2 10 6 IN. ;&.;.:' • - p * _ 4 DIAM. MIN. PERFORATED PLASTIC PIPE CITY oz TI 0 SCHEDULE 40 or ADS HIGHWAY GRADE • • BUi�a G oi �v s /o N 14 KEYWAY ►I 0.4H MIN. FOR IOSHA STABLE ROCK, 0.5H MIN. FOR OSHA "TYPE A" SOILS, AND CONSTRUCTION NOTES 0.61-1 MIN. FOR OSHA "TYPE B" SOILS 1. For walls supporting engineered fill, the fill should be overbuilt and the wall constructed against an excavation into already compacted fill. 2. Keyway subgrade and embedment depth should be verified by CARLSON GEOTECHNICAL • 3. Rocks should have a cubical. tabular, or semi - rectangular shape that roughly matches the space created by the previous rock course. Rocks should be laid flat with the long dimension oriented perpendldular to the wall and extending towards the excavation face. Rocks should be staggered such that each rock bears on at lean. two rocks below and vertical joints are discontinuous_ Rock placement and wall integrity should be checked (by builder) by lightly hammering on the top of each rock with excavator bucket. 4. Minimum rock sizes should be determined using the ROCK SIZE SCHEDULE above, where D is the distance from the base of the rock to the top of the wall. Rocks should be no smaller than 500 lbs. 5. VoIdS greater than 6 inches wide where there is no contact between adjacent rocks should be chinked with a small rock. 6. Backfill behind the rocks should consist of an average 12- inch -wide sheet of 4 "-0 well graded crushed aggregate with no more than 7% fines passing the U.S. Standard No. 200 sieve. Backfill should be placed in lightly compacted to an unyielding state in 12 Inch lifts has each course of rocks is placed. • PIa. 04,• , Carlson Testing, Inc. _ P.O. Box 23814 Erickson Heig Subdivision CGT Job No. G0101867.E is. Tigard, Oregon 97281 i 1 / C- Ski/ • •• •• •• • • • • • . S i••..• • • . . . .. .... •• .. .. .. ••• • • •• • • I • • • • • • • ••• . ... • .. 1 . 7 - z 000 3/ • __' % • • . • • . • • . . • • • • .. ... • • • .. • • • ... I OF TIGARD ••.... • . .. • •.. Tuesday, November 05, 2002 ••• • • •• • • •• •• OREGON • • . • • • • .. • • .. • . • • Robert D. Wood: Vl±:of CdnStncctidn:.• Renaissance Properties FILE c 1672 SW Willamette Falls Dr. West Linn, OR 97068 RE Erickson Heights II, Retaining Walls and Fill, Lots #2 -10. Dear Robert: Thank you for your cooperation in taking steps to resolve the issues concerning the rockery retaining walls and fill on Lots #2 - 10 at Erickson Heights II. Permit applications and plans regarding the subject walls and fill have been received by the City of Tigard. The lot numbers, street addresses, and permit numbers are listed on the attached exhibit. The City recognizes this submission as meeting the timeline requirement set forth in the September 24, 2002 Notice of Violation letter sent to Renaissance but, as you know, the application and plans do not resolve or propose corrections regarding the issues raised about this site in that September 24 letter from the City, the September 17 report from Kleinfelder, Inc., or the October 21 report from Carlson. We will accept these plans as a pro -forma submission pending receipt of revised and updated plans upon which we will conduct a formal plan review. Please submit plans revised to address and correct the issues and concerns raised in the above letter and reports. We have not yet assigned a permit number to the application for lot #7, 10690 SW Kable. The two rockery walls on that lot were included in the original plans for the subdivision. If corrective work on those walls is required before the design engineer, Carlson, can verify the adequacy of their construction and issue a final acceptance letter, please let us know and we will issue a permit on this property. If Carlson is able to approve these walls as having been constructed in accordance with their original plans and will issue a final acceptance letter on them, specific for this lot, please forward that letter to us. Please note that the City's September 24 letter provided 30 days for submission of the permit applications and a total of 90 days or 60 days additional for completion of all corrections, including plan review, construction, inspection, and approval. As of today, November 5 52 days remain of that 90 day period, which ends at close of business on Friday, December 27, 13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772 • • •• •• •• • • • • •• . . • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 2002. Please note fyrther:at final irspec approval will require submission of a final acceptance lettei fr the 4i sqn on$irieerss). • • • • • • • • ••• • • • • ••• • • ••• Sincerely, • • • • Gary Lampella, Building Official cc: Steve Hunt, Hap Watkins, Albert Shields • •• •• •• • • • • ••• • • •• •• • • • • • • ••• • • •• • • • • • • • • • • • • • • • • • • • • • • • • • ••• • • • •• • • • •• • • • • • • • • • • • • • • • • • • • • • • • • • • • • ••• ••• • ••• • ••• ERICKSON HEITTB., RETAINING WALLS AND FILL • • • • • ••• ••• •• • • • • Lot No. Permit No. Street Address 2 SIT2002 -00028 10856 SW Kable St. 3 SIT2002 -00029 10832 SW Kable St. 4 SIT2002 -00030 10810 SW Kable St. 5 SIT2002 -00027 10788 SW Kable St. 6 SIT2002 -00031 10722 SW Kable St. 7 SIT2002 -000XX 10690 SW Kable St. 8 SIT2002 -00032 10652 SW Kable St. 9 SIT2002 -00033 10630 SW Kable St. 10 SIT2002 -00034 10600 SW Kable St.