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HomeMy WebLinkAboutLand Tech Engineer Report Stagecoach Hills Report 09-2012 ` G45otechnical F Environmental Engineering Construction Materials Testing EIS inEErs Laboratory Testing September 7, 2012 Mr. Jarrod Greenwood Town of Westlake 3 Village Circle, Suite 202 Westlake, Texas 76262 RE: Stagecoach lolls Streets — Town of Westlake Dear Jarrod: In accordance with your request, LandTec Engineers has prepared the following report of our assessment of the pavement cracks on several of the streets in Stagecoach Hills, Town of Westlake, Texas. The report includes results of our observations, core samples, borings, tests, consultation with an independent pavement expert, recommendations, and options for repair of the pavement cracks and timing for repair. Section 1.0 of the report presents a brief summary of the street construction project, climate conditions, pavement cracking, cause of the cracking, and repair options. Section 2.0 of the report includes technical information on the core samples and tests performed, as well as our observations, meetings, etc. Section 3.0 includes information provided by the consultants, monitoring recommendations, repair options and recommendations for remediation of the pavement cracks. LANDTr=C ENGINEERS, LLC 1700 Robert Road Suite 101 Mansfield,Texas 76063 817.572.2818 Fax 817.453.9984 1.0 Report Summary The following is a brief overview of the Stagecoach Hills pavement project including background, existing conditions, assessment of the pavement cracks, and repair recommendations. Please see the other sections of this report for specifics. Prior to recent construction, the pavement in Stagecoach Hills consisted of approximately 1 to 3 inches of asphalt pavement supported by approximately 2 to 8 inches of sand and gravel base material. This pavement section is fairly typical for residential streets installed in the early 1970's. The new pavement section in Stagecoach Hills typically consists of 4 inches of asphalt pavement placed on an 8 inch thick layer of base material prepared by rotary mixing the old original asphalt pavement and underlying sandy gravel base with approximately 40 pounds of Portland cement per square yard to bind the materials together. In the pavement construction industry this process is termed Full Depth Reclamation or FDR. Rather than remove and haul off the old asphalt pavement and base material, a heavy duty re-claimer mixing machine was used to mix the existing asphalt pavement and underlying base material. The mix of asphalt and base was then mixed with cement and compacted. This is a common approach to reworking old asphalt pavements to make good quality base to support new asphalt pavement. FDR is used all over North Texas by Cities and Counties, the State of Texas, as well as surrounding states. The FDR method recycles the materials; no need to haul in aggregate or haul out old materials for stockpiling or disposal. Typically there is no need for detours since FDR can be accomplished under traffic, making the process more convenient for local residents. At least one lane of traffic is open at all times. Construction of the streets began in early April and was completed in late April, 2012, Weather conditions prior to April included cool to warm days with temperatures ranging from the low 60's to the mid 80's. A few rain showers occurred in April and the overall ground conditions were moist from rains in late 2011 and early 2012. 9745 Stagecoach Hills-Sept2012.doc 2 LANDTEC ENGINEERS May was progressivel�r wanner with less rain and the temperature hitting 95 degrees on May 25t . By June the weather was hot, with some days approaching the raid to upper 90's and the temperature hit 100 degrees on the June 24th. June was a hot, dry month. July was also hot and dry with many days of 100 degrees or snore. In summary, by the end of May and first of June, the weather conditions suddenly changed to a hot and dry climate. This quick change in climate caused drying of the subsurface soils. On June 18, 2012 we were asked by Westlake and Graham Associates to meet with the contractor Peachtree Construction on Janet Court to observe cracks in the cul-de-sac. Cracks were observed within the asphalt between the fire hydrant and the valve box, at the far west end of the court. This is also the general location of a water line placed last year. On June 19, 2012 we returned to Janet Court to perform two cores within the crack along the north side of the cul-de-sac. On July 11, 2012 new cracks were observed in Janet Court and along Thornton Drive. At this time additional cores of the asphalt and base material were made on these two streets. Boil borings were also taken on this date. Observations made at the time the cores were taken indicated the cracks in the pavement extended not only through the asphalt and base material, but also deep into the subsurface soils well below the new pavement construction depth. Our observations indicate the cracks opened in the pavement due to dry climate conditions starting in May and continuing in June- 2012, causi_ nc,�the gr_oun i'adjacent fo the street to dry out and shrink, putting tension on the soil below the pavemen and within the pavement itself. The pavement cracks rd-s�pond-e-dTo-Ifie-raih even s-be�een X(A ust 14 arid 18, and stopped increasing in width, and in some cases closed by approximately 30 to 50 percent as observed on August 21, 2012. Per the request of the Town of Westlake, Graham Associates and LandTec Engineers were asked to consult with an outside pavement expert. The name and resume of Mr. Lawrence Kelly, P.E,, President of TQD Group was provided to Graham Associates for review. Mr. Kelly has over 30 years' experience as an engineer and manager with the Texas Department of Transportation (TxDOT) in the Dallas and Fort Worth Districts, and also has many years in private practice on major roadway and paving projects throughout the Dallas-Fort Worth area. 1745 Stagecoach Hills-Sept2012.doc 3 LANDTEC (ENGINEGR5 Mr. Kelly has observed the pavement cracking in Stagecoach Hills, discussed the paving project with Peachtree Construction, Graham and LandTec, reviewed test data, and attended the meeting at Town Hall on August 14, 2012. He has concluded, and as stated in the meeting, that the asphalt street has been constructed properly and is appropriate for the residential streets. In his opinion the pavement cracks are the result of historic drought conditions we are experiencing. He has observed this same cracking situation in many cities and towns in North Texas. The soils are drier to deeper depths than we have experienced over the past 30 years. He also recommended that the cracks be monitored for at least 30 to 60 days and let "seasonal weather" run its course. He suggested that we monitor the cracks about every other week to determine the response of the cracks with climatic conditions. In October he said that a final recommendation as to how to best repair the cracks can be made. Repair work should not be initiated until the crack monitoring is complete, which will be approximately October 2012. Some adjustments within the crack repair procedures may be made based on the monitoring work. Options for repair of the larger pavement cracks include removal of a section of the asphalt pavement along the crack with a milling machine; seal the crack below the asphalt and within the subgrade soils using cement grout or another type of material. A strip of elastomeric material would then be placed followed by new Type D asphalt. Following repair of the larger cracks, portions of the cracked area can be overlain by Plant Mix Seal, which is a thin layer of asphalt that will cover repairs of the larger cracks as well as cover and seal the smaller cracks. An asphalt "rejuvenator" consisting of a sprayed on liquid application can be used to make cosmetic repairs. The material basically seals the surface of the asphalt and provides a consistent color to the surface. 4745 Stagecoach Hills-Sept2012.doc 4 LANDTEC ENGINEERS 200 Field Teats, laboratory Tests and Observations On June 18, 2012 we were asked by Westlake and Graham Associates to meet with the contractor Shawn Rieger with Peachtree Construction on Janet Court to observe cracks in the cul-de-sac. Cracks were observed within the asphalt between the fire hydrant and the valve box, at the far west end of the court. This is also the general location of a water line placed last year. On June 19, 2012 we returned to Janet Court to perform two cores within the crack along the north side of the cul-de-sac. These two cores are identified as C- 1 and C-2. The asphalt pavement was found to consist of Type D, surface course mix and Type B, base course mix. A total thickness of 4 to 4-1f4 inches was measured at the two locations cored. Results of the cores and a brief report were submitted on June 26, 2012. The cracks were found to go through the 4 inches of asphalt, the 8 inches of base material and to at least 3 feet below the top of pavement, indicating deep shrinkage cracking. We recommended the cracks be sealed. On this date we also drove over to Aspen Lane. We did not observe any cracks. Aspen Lane was reconstructed in the summer of 2011 using the same pavement construction procedures and thickness. July 6, 2012: Met with Jarrod, Brian Avirett and Shawn Rieger on Janet Ct. and Thornton Drive to observe the cracks. At this time, it was decided to perform additional cores on Janet Ct. and Thornton. On this date we also drove over to Mahotea Boone and cracks were discovered in the asphalt today east and west of the top of the hill. Jarrod indicated a few weeks prior to July 6, when they were installing a fire hydrant, there were no cracks in the street. The street was reconstructed during the summer of 2011. On July 11, 2012 additional cores of the asphalt and base material (CTB) were made on Janet Court and Thornton Drive. Soil borings were also made on this date with a truck mounted drill rig. The cores and borings made on this date are identified as C-3 through C-11. Cores C-3 through C-7 was taken on the cul-de- sac portion of Janet Court (approximately 5923 Janet Court). Cores C-8 and C-9 were made on the east end of Janet Court (approximately 5937 Janet Court). Cores C-10 and C-11 were made on Thornton Drive just south of the Janet Court intersection (approximately 13308 Thornton). 1745 Stagecoach Hills-Sept2012.doc 5 LANDTEC ENGINEERS Soil samples were obtained with the drill rig in core locations C-5, C-6, C-7 and C-3. Selected representative samples were tested for plasticity index, moisture content, unit dry weight, unconfined compressive strength and swell. Samples of the asphalt and Cement Treated Base (CTB) were tested for various physical properties. The cracks extend much deeper below the bottom of the base material. A thin wire was used to push into the crack below the cement treated base, and the crack extended as far as the wire was in length, approximately 24 inches. Counting the pavement thickness of 12 inches plus the 24 inches, the crack is at least 36 inches or more in depth. Cracks were present within the old asphalt. Since the cracks developed over a long timeframe and opened and closed seasonally with loose asphalt and sand filling in the crack at the surface, they were probably not as pronounced. Cracks are over 3 feet deep, and probably as deep as 5 to 10 feet. Tree roots were found in the borings and moisture is being pulled out of the street subgrade by the trees. Soils encountered in the borings consisted of all types of soils. Expansive and non-expansive soils are present within the development and underlie the streets. Boring logs for each core and boring are attached in Appendix A. Tree roots were found in several of the borings that were drilled in the street, confirming the roots are reaching out to find moisture below the street, especially where trees are not receiving water on non-irrigated lots within the subdivision. Core samples of the CTB were obtained in several locations. Unconfined compressive strength tests performed on the core samples indicate strengths ranging from 230 psi to 650 psi with an average of 430 psi. The desired range is 250 psi to 800 psi per TxDOT. Therefore, the CTB has adequate range in strength based on the test data. Based on the results of the cores, borings, laboratory tests, etc. we revisited the original pavement design calculations and have determined that the structural integrity and design life of the asphalt and base material has not been compromised by the cracks within the pavement and underlying soils. The pavement remains a 20 year plus pavement section, as designed. 1745 Stagecoach Hills-Sept2012.doc 6 CANDIFEC ENGINEERS The more pronounced cracks are located on Janet Court within the cul-de-sac at address 5928; approximately 5937 Janet Court, which is the east end of Janet near Thornton; and on the east side of Thornton near address 13308. In each of the three locations the crack extends to depths greater than 5 feet. The area of cracking on Thornton has relatively sandy soils. Janet Court has shallow expansive clays on the west end. August 2, 2012: Observed and measured cracks in Janet Ct. and Thornton. Cracks were not observed within the asphalt pavement on Stagecoach Circle, the section of Thornton from Stagecoach to just south of 13308 Thornton, and Steve Court (except for two smalls cracks on the west end) on August 2, 2012. Steve Court has shallow expansive soils on the west end and sandy soils on top of the hill. Shallow expansive clays are present on Stagecoach Circle and the south end of Thornton. August 13, 2012: Conference call with Jarrod and Jeff to discuss current observations, causes and recommendations. August 14, 2012: Meeting at Town Hall with Tom Brymer, Jarrod Greenwood, Joseph Lopez, Jeff Williams, Tom Baker, Lawrence Kelly and Roderick Wisham. Discuss observations, tests, and reasons for cracks, solutions, options and timing. August 21, 2012: After more than a month without rain and many days with temperatures above 100 degrees, Stagecoach Hills received rain on Tuesday night August 14; Friday night August 17 and again on Saturday night the 18th. The total rainfall was between approximately 3 and 4.5 inches in the general area. Observations on Tuesday August 21 revealed some of the cracks were already closing on Janet Court and Thornton Drive due to moisture increase along edge of the street and in lawns. The crack on Janet Court, Core Location #2, was measured to be three-quarters (314) inch wide on July 11. On August 21 (after the rain) the crack is three-eight's (318) inch to one-half (112) inch wide, closing approximately 30 to 50 percent. The cracks closed about as quickly as they opened. However, if the climate returns to hot and dry conditions, the cracks should be expected to reopen. The larger crack on Janet Court and Thornton Drive are unusual and appear to be different than typical reflective cracking. The crack on Janet Court generally follows the water line and the larger crack on Thornton is in the same location where in the past (about 2007) a fairly significant repair was made to the street 1745 Stagecoach Hills-Sept2012.doc 7 LANDTEC ENGINEERS (as see in Googfe Earth). Both these cracks are not normal cracks and something other than dry weather shrinkage cracking may be occurring. An excavation may have been made in the street and may not have been backfilled and compacted properly. The excavation could have been associated with a utility line repair or some other type of subsurface occurrence such as a septic tank lateral field. Basically the cracks opened in the pavement due to hot, dry climate conditions starting in May and continuing in June 2012, causing the ground adjacent to the street to dry out and shrink, putting tension on the soil below the pavement and within the pavement itself. The pavement cracks responded to the rain events between August 14 and 18, and stopped increasing in width, and in some cases they closed in width by approximately 30 to 50 percent as observed on August 21, 2012. Roanoke Road, between State Highway 170 and the Roanoke City Limit (about 800 linear feet) was reconstructed in late June and early July 2012 by Peachtree using the same construction procedure, and cracks have not appeared in the asphalt surface as of August 21, 2012. This could be due to the fact that the ground around and below the street was already dry when construction took place. North Texas cities are suffering through the hot dry summers with cracked pavements. We have photos of pavements in Southlake (White Chapel Road and FM 1709); Mansfield (Walnut Creek); Argyle, Fort Worth, and many other roads in the Dallas-Fort Worth area with cracked asphalt pavement. Several streets in Westlake are undergoing cracking due to the hot, dry weather including Roanoke Road, just north of the entrance to Stagecoach Hills and the section between the corporate office and Hwy 170; Ottinger Road adjacent to Westlake Academy within the new section of asphalt pavement; and along Ottinger north of the Westlake Academy entrance to the left hand curve (headed north). 1745 Stagecoach Hills-Sept2012.doc 8 LANDTEC ENGINEERS 3.0 Recommendations, Repaor Options and Tuning In accordance with your request to consult with a pavement expert, we provided the name and resume of Mr. Lawrence Kelly, P.E., and President of TQD Group to Graham Associates for review. Mr. Kelly has over 30 years of extensive experience as an engineer and manager with the Texas Department of Transportation (TxDOT) in the Dallas and Foil Worth Districts, and also has marry years in private practice on major roadway and paving projects throughout the Dallas-Fort Worth area. Upon Graham Associates review of Mr. Kelly's resume, he was invited to attend the meeting in Westlake on August 14, 2012 at Town Hall with Tom Brymer, Jarrod Greenwood, Joseph Lopez, Jeff Williams, Tom Baker, Lawrence Kelly and Roderick Wisham. Mr. Kelly has observed the pavement cracking and reviewed the core tests results. He has concluded, and as stated in the meeting, that the street pavement section has been constructed properly and is appropriate for the residential streets. In his opinion the pavement cracks are the result of historic drought conditions we are experiencing and he has observed this same situation in many cities and towns in North Texas. We have not seen the soils this dry to these deep depths in our experience over the past 25 to 30 years. The historic drought conditions have caused the subsurface soils to undergo extreme loss of moisture with deep drying and contraction of the soil, in some cases to depths of 5 feet and often to depths of 10 feet or more. Loss of soil moisture causes shrinkage of the soil mass, therefore creating deep cracks within the ground. These cracks are reflected up into the ground surface and through pavement. Little can be done to eliminate these deep seated shrinkage cracks. This is especially true where trees near the street are in search of moisture and extend their roots to distances of one to two times the tree height, pulling moisture out of the pavement subgrade soils. One of the suggestions made by Mr. Kelly during the meeting involved filling the larger cracks with water from a water truck or fire hose to see if the cracks close. We reported our "after the rain" observations to Mr. Kelly on August 24, 2012, and the fact that some of the cracks were partially closing due to the rainfall events. He indicated that his idea of filling the cracks with water did not need to be done now, since the rain proved that the cracks are caused by the drought. He further recommended not repairing the cracks, but, rather waiting and monitoring the cracks for at least 30 to 60 days and let "seasonal weather" run its course. He suggested that we continue to monitor about every other week to 1745 Stagecoach Hills-Sept2012.doc 9 Ls4NDTEC ENGINEERS determine the response of the cracks. A final recommendation for repair of the cracks can be made in October 2012. The following information was discussed in the August 14th meeting. We plan to monitor the more pronounced cracks on a twice per month basis to determine the progression of the crack longitudinally along the street and the width of the crack. The purpose is to determine whether the cracks are increasing or decreasing in width as the soil moisture conditions change from dry to moist and vice versa. Following the monitoring in September and early October 2012, we will recommend a time to repair the cracks and the method(s). Options for repair of the larger pavement cracks include the following. 1 . Remove a section of the asphalt pavement along the crack with a small hand operated milling machine that removes approximately 12 inches of pavement width and to the full depth of asphalt. The crack would need to be sealed below the asphalt and within the subgrade soils using cement grout or another type of material. A strip of elastomeric material would then be placed followed by new Type D asphalt. Bather than using a grout to fill the crack, a backer rod material can be used, depending on the width of the crack and available sizes of backer rod material. 2. Following repair of the larger cracks as suggested in Item #1, portions of the cracked area can be overlain by Plant Mix Seal, which is a thin layer of asphalt that will cover repairs of the larger cracks as well as cover and seal the smaller cracks. 3. Repair work should not be initiated until the crack monitoring is complete, which will be approximately the end of September to mid October 2012. Some adjustments within the crack repair procedures may be made based on the monitoring work. 4. An asphalt "rejuvenator" consisting of a sprayed on liquid application can be used to make cosmetic repairs. The material basically seals the surface of the asphalt and provides a consistent color to the surface. It is important to preserve the asphalt pavement and to catch deterioration early and preserve the pavement to limit the amount of damage from environmental causes including drought conditions, UV light rays and extended periods of excessive heat. Preserving the asphalt involves crack sealing to seal water out of the larger cracks, spot seals, strip seal coats such as Plant Mix Seals, and rejuvenation material applications. Any emulsion seal should have good adhesion and durability properties. 1745 Stagecoach Hills-Sept2012.doc 10 LANDTCC ENGINEERS A minimum of two pavement assessments should be conducted each year, one in the fall and one in the spring. This procedure will allow early detection of defects and correction while the defects are still minor and before they cause pavement failure. The assessments will identify the overall condition of the asphalt and locations were spot repairs are needed. A sealer should be applied about every five years to slow the rate of loss of oils from the asphalt due to UV and heat exposure. Sealing will also limit the loss of oils due to penetration of moisture into the asphalt and will help maintain the asphalts flexibility. Before applying the sealer, any cracks within the asphalt should be cleaned and sealed to prevent intrusion of surface water into the base and subgrade soils. We have taken hundreds of photos during June, July and August 2012 and can provide them to you on a CID, if you so desire. The following information is attached and completes this report. Attachment A - Boring Logs Attachment B —Test Results Attachment C — Photos of Core & Boring Locations Attachment D — Notes and Conditions If you have any questions or comments, please let us know. Sincerely, LANDTEC eN GENEMS, LLC OF 7H D. MKER .......11 400M Thomas D. Baker, P.E., RPLS TBPE Firm No. F-000329 TBPLS Firm No. 100956-00 Distribution: Above (pdf) 1745 Stagecoach Hills-Sept2012.doc 1 LAND EC ENGINEERS ATTACHMENT A (See Photo's in Attachment C for Locations) Project: Stagecoach Hills Westlake,Texas BORING LOG C-01 Project Number: 1745 Sheet 1 of 1 LID Location: See Plan of Borings w a Surface Pl.:Top of Pavement a G . CL O a , R q v a°o EEa v " 3 a wr o Y PAN a > a�i o aaa O A a o U u rn PQ U 1 r Q 6 6 m MATERIAL DESCRIPTION 4"H4 MC&8 112"Cement Treated Base C1 1.fl CLAYEY SAND,brown,moist A2 A3 3.0 5 N N_ m 10 L~ U II^C] .4 Q a P. tJ N W x 0 U t7 6 vt C7 3 15 c Completion Depth: 3 ft Remarks: Janet Court. After coring pavement section,boring was Date: 6119112 hand angered to 3 feet. 0 w IANDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory. ]he FIGURE Al stratification ivies represent the approximate boundary between soil types and the transition cart he gradual. Project: Stagecoach Hills Westlake,Texas BORING LOG C_(}2 Project Number: 1745 Sheet 1 of 1 Location: See Plan of Borings Surface El.:Top of Pavement a 0 v 0 a � ° 3 U o o w Ln Z ca a cl w Z z MATERIAL DESCRIPTION 4 1/4"HMAC&8"Cement Treated Base C1 1.0 5 la R 7 a, va a U O' U i7 v 15 o Completion Depth: 1 ft Remarks: Janet Court. Date: 6119/12 0 m IANDTEC Soil and rock descriptions on this boring log are a con>pliation of data collected in both the field and the laboratory.Ille FIGURE stratification lines represent the approximate boundary between soil types and the transition can be gradual. Project: Stagecoach Hills Westlake,Texas BORING LOG C-03 Project Number: 1745 Sheet 1 of 1 Location: See Plan of Borings X {� ❑o a nA "m w w N Surface El.: Tap of Pavement � o o w a �°Ja a W N z. MATERIAL DESCRIPTION 4"HMAC&8"Cement Treated Base Cl 1.0 CLAYEY SAND,brown,stiff,dr-y w/roots U2 4.5+ 10.0 113.1 15 10 5 27 1.7 U3 4.0 13.6 104.7 30 17 13 44 1.1 3.0 CLAYEY SAND,silty,brown,stiff whron ore U4 particles&roots&w/sandy lean clay seams 4.0 15.4 98.0 39 19 20 49 0.9 4.0 CLAY,tan,stiff,dry w/roots U5 3.5 16.3 115.9 56 21 35 91 1.9 5 U6 3.5 15.4 6.0 10 a q0 z a. C� .7 Q W in +n _r 15 o Completion Depth: 6 ft Remarks: Janet Court. Date: 7/11/12 0 a w - LANDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory. The FIGURE A3 stratification lanes represent the approximate boundary between soil types and the transition can be gradual. Project: Stagecoach Hills Westlake,Texas BORING LOG C-04 Project.Number: 1745 Sheet 1 of 1 �, Location: See Plan of Borings x 0 Surface El.-. Top of Pavement o o °o o '�° �•a) y cai 3 � o Q � o U °' AQ A ^rs 0.i Fy U R. z ti DI)MATERIAL DESCRIPTION A 4"HMAC&8"Cement Treated Base C1 ].0 5 a 10 H a c� ci a a, c� y a x x 0 v H u7 v wr C � 1S o Completion Depth: I ft Remarks: Janet Court. 6 Date: 7111112 0 w LMDTEC Soil and rock dcscriptions on this boring log area compliation of data collected in both the field and the laboratory. ne FIGURE A4 stratification lines represent the approximate boundary between soil types and the transition can be gradual. Project: Stagecoach Hills Westlake,Texas BORING LOG C-05 Project Number: 1745 Sheet 1 of i r10 Location: See Plan of Borings x v 41 Surface El.: Top of Pavement o o w y 11 v o m o Q rs o wcq U c �1 w ° GCOO MATERIAL DESCRIPTION 4"HMAC&8"Cement Treated Base ,41 1.0 CLAYEY SAND,brown,stiff,dry U2 4.0 U3 3.5 3.0 5 l0 ❑ t, 13 a a 0 U ti Q 0 ca 15 o Completion Depth: 3 ft Remarks: Janet Court. o Date: 7/11/12 0 W LANOTEC Soil and rock descriptions on this boring log are a compliation of data collected in loth the field and the laboratory. The FIGURE A5 slrasification lines represent the approximate boundary between soil types and the transition can be gradual. Project: Stagecoach Hills Westlake,Texas BORING LOG C-a6 Project Number: 1745 Sheet 1 of I Location: See Plan of Borings >< Surface El.:Top of Pavement a o o `" 0. � p o 3 ? .o q N p, o o u..w a z MATERIAL DESCRIPTION 4"HMAC&8"Cement Treated Base Al 1.0 SANDY LEAN CLAY,brown,very stiff,dry U2 4.5+ U3 4.5+ 3.0 S N 10 Q H z a .a a V O U W t'7 H d, Wr a C7 3 15 o Completion Depth: 3 ft Remarks: Janet Court. Date: 7111/12 0 ac LMDTK Soil and rock descriptions on this boring log are a comphatien of data collected in both the field and the laboratory.The FIGURE A6 stiralifioation lines represent the approximate boundary between soil types and the transition can be gmdual. Project: Stagecoach Hills Westlake,Texas BORING LOG C-07 Project Number: 1745 Sheet 1 of 1 Location: See Plan of Borings y ; Surface El.:Top of Pavement o 2 0 P 9 A i CV Gi. O fly "' G3 o •0 ,�', Lk P, 47 rn O ,c, O CJ' in o 1`7 Z MATERIAL DESCRIPTION 3 3/4" HMAC&8 1/4"Cement Treated Base Cl 1.0 SANDY LEAN CLAY,brown,very stiff,dly U2 w/gravel&pieces of asphalt(POSSIBLE.FILL) 4.5+ 5.3 91.5 1.2 U3 4.0 9.7 98.7 35 13 22 72 1.0 U4 . 3.5 4.0 5 N a to E+ r� (3 41} Q Q a a x U d O U Fd- w a r� a t7 � 15 o Completion Depth: 3.5 ft Remarks: 5928 Janet Court. 0 Date: 7/11/12 0 0 b oTec Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory.'Me FIGURE A7 stratification lines represent the approximate boundary between soil types and the dansition can be gradual. Project: Stagecoach Hills Westlake,Texas 1ROPJ TG LOG C-08 Project Number: 1745 Sheet 1 of 1 Location: See Flan of Borings Surface El.: Top of Pavement o 0 0 4 'gip y 4. U3 0 o P�° °gin w a�i o E o-ui U o O A � �"CQ � U MATERIAL DESCRIPTION x 3 1/2"HMAC&8 1/2"Cement Treated Base C1 1.0 SAND,silly,brown,dry w/crack running U2. through sample 4.6 15 U3 2.5 SANDY LEAN CLAY&clayey sand,tan, 4.5 5.5 stiff,dry w/lean clay seams w/roots U4 4.0 13.1 100.3 23 12 11 47 0.5 U5 3.5 117 5 U6 4.0 6.0 N 10 V H J a C'7 J .a X x O CW7 Q a n_ J C7 � 15 o Completion Depth: 6 tt Remarks: 5937 Janet Court. Drilled over crack in pavement,wire Date: 7111/12 goes down into crack 3+feet. 0 m IANDTEC Soil and rock descriptions on this boring log are a compliatiou of data collected in both the field and the laboratory.The FIGURE A8 stratification lines represent the approximate boundary between soil types and the transition can be gradual. Project: Stagecoach Hills Westlake, Texas BORING LOG C-09 Project Number: 1745 Sheet 1 of 1 Location: See Plan of Borings ; Surface EL Top of Pavement o 0 0 �� � � � �.� 0 y � b 'mow A 'g 3w 01 H CD P.cn P. moo ° A U Go Z MATERIAL DESCRIPTION 4 1/8"HMAC&8"Cement Treated Base Cl 1.0 5 N N a 10 r U H p d a vi S U Q U W C7 F vi M1 {r7. 3 15 a Completion Depth: 1 ft Remarks: 5937 Janet Court;pavement core taken 5 ft. south of C-8. Date: 7/11112 fl as - LANDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory, the FIGURE A9 stratification lines represent the approximate boundary between soil types and the transition can be gradual. Project: Stagecoach Hills Westlake,Texas BODING LOG C-10 Project Number: 1745 sheet 1 of 1 Ln Location: See Plan of Borings X U cut Surface El.: Top of Pavement 4 4 a _ a . O �p3 Q a tea° o ar o o ci p.., o vV A � o N U . a z MATERIAL DESCRIPTION C1 3 118"HMAC(1 1121'D&1 518"B) 03 5 �. 10— t~ A t7 U O U U F fa 15 o Completion Depth: 0.3 ft Remarks. 13308 Thornton. Cored over crack in pavement,wire goes 0 Date: 7/11112 down into crack 3-r feet. 0 m LANDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory.The FIGURE A 10 stratification lines represent the approximate boundary between soil types and thetrrrsitinn can be gradual. Project: Stagecoach Hills Westlake,Texas BORING LOG C--11 Project Dumber: 1745 Sheet 1 of l Un Location: See Plan of Borings 9 Surface El.:Top of Pavement c 0 0 0 y MATERIAL DESCRIPTION x C1 3 3/8"HMAC(1 7/8"B&1 112"D) 0_3 5 N F- R a. V H x U 4 U F a C7 15 0 Completion Depth: 0.3 ft Remarks: 13308 Thornton. Core is taken 3 ft.west of C-10. Date: 7/11/12 a ca LMDTEC Soil and rock descriptions on this boring log are a compliation of data collected in both the field and the laboratory. The FIGURE A11 stratification lines represent the approximate boundary between soil types and the transition can be gradual. The following Table presents a summary of the pavement section encountered in the core samples and borings. Table 1 Summary of Existing Pavement Conditions Core Asphalt Base Total No. Section Section Thickness 2.0"Type D 8.5" Cement 1 2.0"Type B Treated Base 12.5" Total =4.0" (CTB) 2.0"Type D 2 2.25"Type B 8.0" CTB 12.25„ Total =4.25' 2.20"Type D 3 1.72"Type B 8.1" CTB 12.01" Total= 3.92" 4, 5 and 6 1.76" Type D 7 2.01" Type B 8.25" CTB 12.02" Total = 3.77" 8 1.83 ° Type D 9 2.30 " Type B 8.15"CTB 12.28" Total=4.13" 1.50 " Type D See Asphalt 10 1.63" Type B CTB Not cored Section Total = 3.13" 1.88" Type D See Asphalt 1.1 1.50" Type B CTB Not Cored Section Total = 3.38" *Drilled through the pavement section with truck drill rig and no cores taken at these locations. Already had core samples from adjacent hole. 1745 Stagecoach Hills-Sept2012.doc B-1 L4NDTEC ENGINEERS SUMMARY OF RESULTS SWELL TESTS Stagecoach Hills Town of Westlake, Texas Project No. 1745 July 21, 2012 Initial Final Dry Overburden Baring Depth, Moisture Moisture, Wgt, Swell, Pressure:, No. Ft. , % % pcf % Psf C-3 3-4 14.4 19.7 107.1 0 375 C-3 4-5 15.7 18.6 111,2 0.9 500 C-8 3-4 12.8 20.5 99.3 0 375 1745 Stagecoach Hills-Sept2012.doc B-2 LAeNDTEC ENGINEERS GEOTECHRICAL AND CONSTRUCTION MATERIALS ENWHEERING- 7423 Airport Freeway, Fort worth ix 761 is 222 W. Exchange AVVOU0, Uite He, NZ, Fort Worth TX 16106 Tel, (817)-599-9933: (817) 616-0922; fax. W-590-4433 I)FTERMINATION Qf2L .�NSITY OF COMPACTED WTU�,LUNOUSS MATERIAL TEX-207-F PROJECT: Stagecoach Hills PROJECT No- 1745 CLIENT s. 1.andtec REPORT No.; DATE. 7/1612 TECHNICIAN: T,SMITH R SAMPLE I KNESS BULK MAX THO. PER E AI NUMBER (INCHES) SPECIFIC -SPE.C. GRAV. D F N.?S I'l "VOIDS GRAVITY 2.20 2.271 2.482 C-7S 1482 ., 97.91 C-9s 2.482 1 93,0 90�i 2.515 C-33 1.72 9.9* 4- C-711 2.01 2.513 91.1 89 (._(._913 2.30 2.308 1 91.8 f 8.2 _9 2515 r ------------- SPFQjE1_4;AT1-01 S, 5-9%air voids;91-95 percent densit,y .LtfKtt,?_ "11-denotes deviation from soecifications S-denotes surfw�c course,& B-denotes base course LOCATION. Resipectfwly Submimd, Terry TSIT 7353 Airpoff Freeway, Fort Wotth, Texas 76118 RF,PORTOF CORE COMPRESSIVE STRENGTH PROJECT NAME: Sta-ccoach Hills REPORT No.. L� PROJECT NUMBER: 1745 REPORT VATE- 07,116112 CLIENT: Landuc DATE TESTED: X37!11112 CLIENT CON-fACT: TECHNICIAN: 1'. Smith DATE CORED; 07111:`12 Required Strength: PSI DATE PLACED., Not furnished MIRII- COR[-'.D CAPPED cm-ft--- UD 11.,A)C RR TOTAL cumpre'sSive u )ER LENGTH(IN LENGTH(jlfl�N�", IDIAM.(IN) RATIO I FACT. WAD(LBS) Site n�! C4 5.58 3.74 1,492 1 0.9588 4000 350 4.60 3.74 1.:30 0.9228 3 321 a 280 ' C9 6.45 3,74 1.725 0.9 776 7300 650 Avcmg,c Sireingth 430 PSI CORE LOCATION: 3) Nuiv;Thk mvn i�1'br 11W cxclusivA!ust:at the Clicii I ad&e-ssed. 'I his rclicri wty rjo;hr mproduced except in As calimy,without the wittm consent ofTSIT, Results appiy only to abowtests. Afthur Ether',, W 4'1 F �° - ate• _�:` ,..�r - � L Photograph 3 1745 Stagecoach Hills-Sept2012 Photos.doc G-2 l ANDTEC ENGINEERS ATTACHMENT NOTES ARIL CONDMONS The services described in this report were performed consistent with generally accepted geotechnical engineering principles and practices. No other warranty, express or implied, is made. These services were performed consistent with our agreement with our client. This report is solely for the use and information of our client unless otherwise noted. Any reliance on this report by a third party is at such party's sole risk. Opinions and recommendations contained in this report apply to conditions existing when services were performed and are intended only for the client, purposes, locations, time frames, and project parameters indicated. We do not warrant the accuracy of information supplied by others, and the use of segregated portions of this report. The conclusions and recommendations in this report are invalid if * The report is used for adjacent or other property or streets ® Traffic type, loading and frequency change from estimated information. o Grades, shallow subsurface seepage levels, or both, change between the issuance of this report and construction Any other change is implemented that materially alters the project from that proposed when this report was prepared The pavement and subgrade samples do not provide a warranty of the conditions that may exist over the entire street. The extent and nature of subsurface soil and groundwater variations may not become evident until construction begins. Variations in soil conditions between samples could possibly exist between or beyond the points of exploration or groundwater elevations may change, both of which may require additional studies, consultation, and possible design revisions. Reproduction of this report, or any part thereof, supplied to persons other than the client, should indicate that these tests and subsequent report of findings and recommendations are soil type specific only and may not represent other roadway conditions and soil types. The scope of our services did not include any environmental assessment or investigation for the presence or absence of wetlands or hazardous or toxic materials in the soil, surface water, shallow subsurface water or air, on or below or around this site. 1745 Stagecoach Hilts-Sept2012.doc D-i LAN®TEC ENGINEERS