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HomeMy WebLinkAboutHWY 74 ROADWAY WIDENING - MATERIALS REPORTTHF TWINING LABORATORIES, INC. ANALYTICAL CHEMISTRY -ENVIRONMENTAL SERVICES GEOTECHNICAL ENGINEERING -SAMPLING SERVICES CONSTRUCTION INSPECTION & MATERIALS TESTING REVISED MATERIALS REPORT~ ROADWAY WIDENING CALIFORNIA STATE ROUTE 74 POST MILE R16.160 TO POST MILE 17.570 LAKE ELSINORE, CALIFORNIA CALTRANS DISTRICT 8 RIVERSIDE COUNTY, CA Bridge Number 56-723 RIL The Twining Laboratories Inc. Project No. D050C4.06-03 For: Home Depot U.S.A., Inc. 3800 West Chapman Avenue Orange, CA 92868 November 15, 2006 CORPORATE MODESTO CORONA BAKERSF15LD MONTEREY SACRAMENTO 2527 Fresno Street 6253 Jenualem Court, Suite E 840 East Avenue, Sulte 104 3651 Pegasus Dme. #117 601 Orfjz Avenue 5675 Power Inn Road, Suite C Fresno, CA 93721-1804 Modesto, CA 95356-9322 Corona, CA 92879 Bekers6eld, CA9330&6843 Sand City, CA 93955 Samrnenb, CA 95824 (559) 268-7021 (209) 342-2061 (951) 89B-P,14�2 (661),%35099 (831) 392-1056 (916) 3814477 Fax 268-7126 Fax579-1480 Fax8�9-8574 Fax393.4643 Fax392-1059 FaxSe1447S THE TWINING LABORATORIES, INC. ANALYTICAL CHEMISTRY • ENVIRONMENTAL SERVICES GEOTECHNICAL ENGINEERING • SAMPLING SERVICES CONSTRUCTION INSPECTION & MATERIALS TESTING November 15, 2006 Mr. Jim Anders Home Depot U.S.A.; Inc. 3800 West Chapman Avenue Orange, CA 92868 Subject: Revised Materials Report Roadway Widening State Highway 74, Post Mile R16.160 to 17.570 Lake Elsinore, California Dear Mr. Anders: D050C4.06-03 We are pleased to submit this Materials Report prepared for the widening of State Highway 74, between post mile R16.160 and 17.570, at the intersection of State Highway 15, in Lake Elsinore, California. The contents of this report include the purpose of the report, scope of services, background information, investigative- procedures, geologic conditions, evaluations, and recommendations. We recommend that those portions ofthe final plans and specifications that pertain to"earthwork and foundations be reviewed by The Twining Laboratories, Inc. (Twining) to determine if they are consistent with our recommendations. This service is part of this current contractual agreement and the client should provide these documents for our review prior to their issuance for construction bidding purposes. In addition, it is recommended that Twining be retained to provide inspection and testing services for the excavation, earthwork, and pavement phases of construction. These services are necessary to determine if the subsurface conditions are consistent with those used in formulation of recommendations, and if the construction complies with our recommendations. This service is not, however, part ofthis current contractual agreement. We would appreciate the opportunity to provide a proposal for this additional service after construction documents are completed. A representative with our firm will contact you in the near future regarding these services. CORPORATE MODESTO CORONA BAKERSFIELD MONTEREY SACRAMENTO 2527 Fresno Street 5253.1erusalern Cour) Suite E 840 East Parlaldge Avenue, Sune 1o4 3651 Pegasus Drive, #117 501 Ortiz Avenue 5675 Power Irm Road Su%e C Fresno, CA 93721-1604 Modesto, CA 95356-9322 Comm, CA 92879 Oakers W, CA % ae 6843 Sand CRM CA 93955 Samarnenb, CA 95824 (559) 266-7021 (209) 342.2061 (951) m-892 (661) 533.5088 (831) 392-1056 (916) 391.9477 Fax 269"7126 Fax 579-1480 Fax 895"4 Fax 3934643 Fax 392-1059 Fax 381.9478 I-15/SA 74 Separation D05OC4.06-02 November 15, 2006 Page 2 We appreciate the opportunity to be of service to Home Depot U.S.A., Inc. If you have any questions regarding this report, or if we can be of further assistance, please contact us at your convenience at (800) 268-7021. Sincerely, THE TWINING LABORATORIES, INC. d Read L. Andersen Manager Geotechnical Engineering Division RA/dl TABLE Or CONTENTS D050C4.06-02 Page 1.0 INTRODUCTION ............ .........................................i 2.0 PURPOSE AND SCOPE ................................................. 1 2.1 Purpose..........................................................1 2.2 Scope...........................................................2 3.0 BACKGROUND INFORMATION ..................... . .................. 3 3.1 Project Location and General Description ............................... 3 3.2 Proposed Construction .......................... , ................... 3 4.0 INVESTIGATIVE PROCEDURES ........................................ 4 4.1 Research.........................................................4 4. 1.1 Original Construction Plans .................................... 4 4.1.2 Geotechnical Reports for Adjacent .............................. 4 4.2 Site Reconnaissance................................................ 5 4.3 Soil Sampling.....................................................5 4.4 Laboratory Testing .......................... ...................... 5 5.0 GEOLOGIC CONDITIONS ........................... 6 5.1 Geologic Setting ................................................... 6 5.2 Surficial Geologic Conditions ........................................ 6 5.3 Groundwater Conditions ............................................ 6 6.0 EVALUATIONS...................,...................................7 6.1 Existing and Proposed Construction ................................... 7 6.2 Asphaltic Concrete (AC) Pavements .............. . .................... 7 6.3 Portland Cement Concrete (PCC) Pavements ............................ 7 6.4 Corrosion Protection ............................................... 8 6.5 Sulfate Attack of Concrete ..................... , , , ........... , ....... 8 TABLE OF CONTENTS D050C4.06-02 Page 7.0 RECOMMENDATIONS................................................. 9 7.1 General..........................................................9 7.2 Site Grading And Drainage ......................................... 10 7.3 Site Preparation .................................................. 11 7.4 Engineered Fill .............................. I ....... I ........... 1 13 7.5 Asphaltic Concrete (AC) Pavements .................................. 15 7.6 Portland Cement Concrete (PCC) Pavements ............... . ........... 19 7.7 Utility Trench ......................................... ........ 22 7.8 Corrosion Protection .............................................. 24 7.9 Temporary Excavations ............................................ 25 8.0 DESIGN CONSULTATION .................. . .......................... 26 9.0 CONSTRUCTION MONITORING ...................................... 25 10.0 NOTIFICATION AND LIMITATIONS ................................ , .. 27 APPENDICES APPENDIX A - Drawings ....... ............................................. A-1 'Drawing No. 1- Site Location Map "' Drawing No. 2 - Test Boring/R-Value Sample Location Map APPENDIX B - Laboratory Results .............................................. B-1 APPENDIX C - Boring Logs ................................................... C-1 REVISED MATERIALS REPORT PROPOSED WIDENING OF STATE HIGHWAY 74 POST MILE R16.160 TO 17.570 LAKE ELSINORE, CALIFORNIA CALTRANS DISTRICT 8 The Twining Laboratories Inc. Project No.: D050C4.06-02 1.0 INTRODUCTION This Materials Report was prepared for the widening of State Highway 74 between post mile R16..160 and 17.570 in Lake Elsinore, Riverside County, California.. The Twining Laboratories, Inc. (Twining) was authorized by Home Depot, U.S.A., Inc. to prepare this report. The contents of this report include the purpose of the report and the scope of services provided. The general site features including location, existing facilities andproposed improvements are described. The existingroadway conditions, the geologic setting, surficial geologic conditions and groundwater elevations are also discussed. Finally, the report provides an evaluation of the findings, and related conclusions and recommendations. The two report appendices contain the site location map (Appendix A), laboratory test data (Appendix B), and boring logs (Appendix Q. The Geotechnical Engineering Division of Twining, headquartered in Fresno, California, prepared this report. "• 2.0 PURPOSE AND SCOPE 2.1 PP its: The purpose of this report was to summarize general project information, prepare a summary of geologic and subsurface soil conditions and develop geotechnical recommendations for the proposed lane widening, and provide the following: 2.1.1 Summary of site geology and subsurface conditions based on available previous reports and information; 2.1.2 Summary of the Existing and Proposed Construction; 2.1.3 Evaluation of potential geologic/seismic hazards; and 2.1.4 Presentation of geotechnical recommendations for new underground utilities and pavement sections for the proposed lane widening. I-15/SR 74 Separation D050C4.06-02 November IS, 2006 Page 2 This reportis provided specifically for the new asphaltic concrete roadway sections and underground utility improvements planned as part of the widening of State Highway 74 between post mile R16.160 and 17.570, as referenced in the Existing and Proposed Construction section of this report. This investigation did not include a site specific subsurface geotechnical or geologic investigation, floodplain investigation, environmental investigation, or environmental audit. 2.2 Scope: The actions undertaken to prepare this report are summarized below. 2.2.1 The Preliminary Geometric Layout, dated September 15, 2005, prepared by MetroPointe Engineers, was reviewed. This plan is referred to, hereinafter, as the Preliminary Geometric Layout. 2.2.2 The Planning Study, dated August 9, 2005, prepared by Willdan, was reviewed. This document is referred to, hereinafter, as the Planning Study. 2.2.3 Selected plan sheets from the original construction plans for the Route 15/74 Separation, prepared by the State of California, Department ofTransportation (1978) were reviewed. The plans include the Log of Test Borings (LOTB). These plans are referred to, hereinafter, as the Original Construction Plans. 2.2.4 A visual site reconnaissance was conducted. 2.2.5 Published geologic maps including the site area wete reviewed. 2.2.6 A geotechnical report prepared in 2004 for a proposed retail development of an adjacent site, at the intersection of Collier Avenue and Central Avenue (northwest of the intersection of Interstate 15 and State Route 74), was reviewed. 2.2.7 A report prepared by Twining entitled "AC Pavement Design Section - Caltrans and/or Public Right of Way" identified by project number D050C4.02, dated March 8, 2005, was reviewed 2.2.8 Mr. Jon Austin (Metro -Pointe Engineers), Mr. Limin He (Willdan), Mr. Peter Liu (Willdan) and Mr. Tim Lam (Caltrans) were consulted during the investigation. 2.2.9 Sampling and testing the near surface soils in the area of the proposed improvements for pavement support characteristics (R -value). 2.2.10 This report was prepared to present the purpose and scope, background information, investigative procedures, geologic conditions, evaluations, and recommendations. 1-151SR 74 Separation D050C4.06-02 November 15, 2006 Page 3 3.0 BACKGROUND INFORMATION This section presents descriptions of the project location, existing facilities and proposed improvements. 3.1 Project Location and General Description: The project is located near the State Route 74 and Interstate 15 interchange in Lake Elsinore, Riverside County, California. The site location is identified on a vicinity map included as Drawing No. 1 in Appendix A. The project consists of the widening of State Route 74 (Central Avenue) between Collier Avenue and Cambern Avenue (Post Mile R16.160 to Post Mile 17.570). Widening of northbound and southbound on - ramps and off -ramps from Interstate 15 are also planned. 3.2 Proposer! Construction: As noted above, the project consists of the widening of State Route 74 (Central Avenue) between Collier Avenue and Cambern Avenue. A portion of the existing State Route 74 within this area extends below the existing Interstate Highway 15 overpass (I-15 / SR 74 Separation). The existing bridge structure is referenced as Bridge No. 56-723 R/L. The north and south sides of State Route 74 at the I-15 overpass consist of 1.5 H (horizontal) to 1 V (vertical) earthen embankments descending from the I-15 bridge abutments to State Route 74. Portions of the embankments below the bridge decks on both sides of State Route 74 are faced with concrete. The proposed widening of State Route 74 below the I-15 overpass will require excavation into the toe of the existing descending embankment slopes to allow for the new lane widening. The Planning Study prepared by Willdan indicates construction of 228 lineal feet (69.5 m) ofretaining walls along both the north and south sides (i.e., 456 total lineal feet (139 m) of retaining wail) of State Route 74 are planned to support cuts into the existing fill embankment at the I-15 overpass. A separate report, the Final Foundation Report, will be prepared for the new retaining wall improvements. It is our understanding that the existing northbound and southbound on -ramps and off -ramps from Interstate 15 will also be widened as follows: The northbound I-15 on-ramp will be widened for a length of about 125 feet (38.1 m), extending from State Route 74; the southbound 1-15 on-ramp will be widened for a length of about 350 feet (106.7 m); the northbound off -ramp will be widened for a length of about 250 feet (76.2 m); and the southbound off -ramp will be widened for a length of about 375 feet (114.3 m). The proposed widening of the east and west bound lanes of State Route 74 will extend from the intersection of State Route 74 and Collier Avenue east to the intersection of State Route 74 and Dexter Avenue for a length of about 1,480 feet (451.1 m). According to Mr. Jon Austin with Metropointe Engineers, portland cement concrete pavement sections should be anticipated in the areas proposed for a bus turnout lane. The proposed bus turnout areas are anticipated to be along State Route 74 within the shoulder areas of the east and west travel lanes. The proposed lane widening improvements are anticipated to include installation of relocated and new utility lines including but not limited to storm drain, electrical, communications, water, sewer, etc. The new utility lines are anticipated to be along State Route 74. This report has been prepared to address the proposed roadway widening, including construction of new pavements, utilities, etc. I-15/SR 74 Separation November 15, 2006 4.0 YNVESTIGATTVE PROCEDURES DOSOC4.06-02 Page 4 The research and observation program conducted for this investigation are summarized in the following subsections. 4.1 Research: Research was conducted including review of the Original Construction Plans prepared for the original construction of the I-15 bridge structure (Bridge No. 56-723 R/L), including the Log of Test Borings (LOTB). In addition, geotechnical report(s) prepared for the adjacent retail development (i.e., at the intersection of Collier and Central Avenue) and geologic and seismic data for the region were reviewed. The pertinent information obtained from the documents reviewed as part of this investigation is briefly summarized below. No otherprevious geotechnical engineering, compaction testing, geological or environmental studies conducted for this site were provided for review. If these documents are or become available, they should be provided to Twining for review. 4.1.1 Ori nal Construction Plans: Based on review of the 1977 Log of Test Borings (LOTB), the native subsurface soils in the site vicinity generally consisted of interbedded sands, silts and silty sands. The blow counts (N -values) noted on the log of test borings indicates the soils to a depth of about 25 feet (7.6 m) (corresponding to an elevation of about 1,265 feet (385.7 m) above mean sea level) are medium dense and are underlain with dense soils to depths of about 40 feet (12.2 m). 4.1.2 Geotechdical Reports for Adjacent Developments: A geotechnical'report prepared in 2004 for a proposed retail development of an adjacent site, at the intersection of Collier Avenue and Central Avenue (northwest of the intersection of Interstate 15 and State Route 74) and a report prepared by Twining entitled "AC Pavement Design Section -Caltrans and/or Public Right of Way" dated March 8, 2005, were reviewed. The geotechnical report indicated the near surface soils throughout the depths explored consisted predominantly of silty sands and sands with interbedded hard to firm clays and sandy silts. Based on the results of consolidation testing, the near surface soils were reported to be moderate to high compressible and subject to hydroconsolidation settlements. The report reviewed indicates the risk of ground rupture due to faulting is considered unlikely. The report identifies a design -basis peak horizontal ground acceleration for this site of 0.598. The March 2005 report prepared by Twining indicated R -value test results of 24 and 55 for the off- site Caltrans roadway improvements along Central Avenue, south of the retail center site. As you are aware Twining has conducted a geotechnical investigation (November 2005) for the Foundation report for the proposed retaining walls associated with the widening of Central Avenue (Highway 74). The soils encountered in the November 2005 investigation indicate that the near surface soils generally consist of silty sands. The near surface silty sands were underlain by interbedded lean clays, silty sands, and sandy silts. 1-151SR 74 Separation DOSOC4.06-02 November 15, 2006 Page S 4.2 KittReconnaissance: The site reconnaissance consisted of avisual reconnaissance of the existing roadway alignment and noting surface features of the roadway and adjacent terrain. The site reconnaissance was conducted by Mr. DeanLedgerwood, ofTwining on November 8, 2005. Vegetation on the embanlanent slopes beyond the existing bridge abutments included a moderate to dense growth of shrubs. Signs of rodent activity were not observed; however, rodent activity could be obscured by the -dense nature of the vegetation. The embankment slopes below the Interstate 15 bridge crossing are faced with concrete. All embankment slopes appeared to slope at a repose of about 1.5H:1 V (horizontal:vertical). The shoulder areas proposed for widening west of Interstate 15 along State Route 74 on the southern edge include vacant property with light vegetation. The north side of State Route 74 west of Interstate 15 at the time of the site reconnaissance included an open utility trench installation associated with the adjacent Home Depot development. The shoulder areas to the east of Interstate 15 along the northern and southern portion of State Route 74 include concrete slab sidewalks with landscaped areas associated with the existing adjacent buildings. The paved surface of Central Avenue consists of asphaltic concrete pavement. No significant signs of distress were observed to the existing pavements during our site reconnaissance. 4.3 Soil SamRlinE: Eleven (11) bulk samples of soil were obtained from the new roadway areas to test for Resistance (R) -value, expansion index, moisture -density relationship, and corrosion analyses. The samples were obtained from each boring location at depths generally extending from about 4 feet BSG. The test borings were logged and the soils were. classified in general accordance with the Unified Soil Classification System. Test boring logs are provided in Appendix B. A Key to Boring Logs is also presented in Appendix B following the logs. The descriptions on the logs are based on field observations and laboratory test results. The test boring locations are labeled as R-1 through R-11 and are shown on Drawing No. 2 in Appendix A. Soil samples obtained were taken to Twining's laboratory for classification and testing. 4.4 Laboratory Testing: The laboratory testing was programmed to determine selected physical and engineering properties of the soils sampled. The results of laboratory tests are summarized on Figure Numbers 1 through 12 in Appendix C. The locations of the R -value sample locations are summarized on Drawing 2 in Appendix A. I-15/SR 74 Separation November 15, 2006 5.0 GEOLOGIC CONDITIONS D050C4.06-02 Page 6 The geologic setting and groundwater conditions, based on a review ofgeologic maps and the USGS Open File Report 99-172 (2004), are summarized in the following subsections. 5.1 Geologic Setting: The site is located in the north part of Lake Elsinore, California in an area known as Warm Springs Valley. Warm Springs Valley is located within the northern section of the Peninsular Ranges Providence and consists of a gentle, westerly sloping alluvial valley floor. The nearest mapped active fault source to the site is the Lake Elsinore Fault Zone, which is located 4.7 kilometers (kin) west of the site. The Elsinore Fault Zone is a right lateral strike slip fault and is reported to be a part of the San Andreas Fault System. The Elsinore Fault System divides the Santa Ana Block Mountains to the west and the Perris Block to the east. The upper portion of the Santa Ana Block consists ofpredominantly Cretaceous marine rocks and Paleogene marine and nonmarine rocks. The Perris Block is predominantly underlain by prebatholithic metasedimentary rocks intruded by plutons of the Cretaceous Peninsular Ranges batholith (USGS, 2004). 5.2 Surfcial GeologicConditions: The Preliminary Geologic Map of the Elsinore Quadrangle (Version 1.0), compiled by Morton, M.D. (1978) and Weber, F.H. (1973-1977), indicates the surficial sediments at the site location consist of Young Alluvial -Channel Deposits of Holocene and Late Pleistocene age, consisting of unconsolidated sand, silt and clay bearing alluvium:V• No known active faults are depicted traversing though the project site. According to the USGS Quadrangle, the ground surface elevation of the site corresponding to the adjacent surface of State Route 74 (at the projected toe of the retaining walls) is about 1,290 feet AMSL. 5.3 Groundwater Conditions: Based on review of the 1977 Log of Test Borings, groundwater was not encountered in the test borings drilled at the time of the initial geotechnical investigation (September 1977) for the existing I-15 bridge structure (Bridge No. 56-723 R/L) to a depth of 50 feet below the ground surface. The Log of Test Borings indicates no groundwater was encountered throughout the depths explored, which extends to an elevation of about 1,240 feet AMSL. However, the test borings conducted by others for the retail development northwest of the intersection of I-15 and State Route 74 encountered groundwater at a depth of about 32 feet at the time ofthe subsurface investigation (November 4, 2003), which corresponds to an elevation ofabout 1,250 feet AMSL. During November 2005 Twining conducted a geotechnical foundation investigation for the proposed tie -back retaining walls to be constructed as part of the Highway 74 widening at the existing Interstate 15 overpass. At the time of the November 2005 investigation groundwater was encountered at depths ranging form 26 to 20 feet BSG, which corresponds to an elevation of approximately 1,263 feet AMSL. I-15/SR 74 Separation DOSOC4.06-02 November 15, 2006 Page 7 It should be recognized that water table elevations fluctuate with time, since they are dependent upon seasonal precipitation, irrigation, land use, and climatic conditions as well as other factors. Therefore, water level observations at the time ofthe initial field explorations may vary significantly from those encountered in future investigations of the site. Accordingly, actual water elevations should be determined by future subsurface geotechnical investigations for this site. 6.0 EVALUATIONS The data and methodology used to develop recommendations for design and construction of the roadway expansion are summarized in the following subsections. The evaluation and recommendations were based upon review of the subsurface conditions noted in the documents reviewed and, based on the samples obtained and tested as part of this report., 6.1. Existing and Pro osed Construction: Roadway widening is planned on the north and south sides of State Route 74 (SR 74), below the existing Interstate 15 overpass and extending east and west of the I-15/SR 74 Separation as part of the SR 74 widening from Collier Avenue to Dexter Avenue. The north and south sides of State Route 74 at the overpass consist of 1.5H (horizontal) to 1V (vertical) earthen embanlnnents descending from the existing I-15 bridge abutments to SR 74. Lane widening is also planned for the northbound and southbound on and off ramps. The shoulders along the on and off ramps are relatively flat with sparse vegetation. 6.2 Asphaltic Concrete (AC) Pavements: Asphaltic concrete pavement structural sbetions are presented in the recommendation section of this'7eport. The structural sections were designed using the gravel equivalent method in accordance with Chapter 600 of the California Department of Transportation Highways Design Manual (fourth edition). The analysis was based on traffic index values ranging from 10 to 12.5. Vehicle loading (traffic index) values should be determined by the project civil engineer or applicable design professional. If more frequent or heavier traffic is anticipated and higher Traffic Index values are needed, Twining should be contacted to provide additional pavement section designs. The anticipated pavement subgrade soils are silty sands. The subgrade support characteristics of the native soils were evaluated by Resistance (R) -value tests. The results of the testing conducted on eleven (11) samples obtained between the ground surface and 3 feet BSG indicated the soils had an R -value ranging from 14 to 69. When grading occurs, additional sampling should be conducted to confirm the design R -value and the pavement design. 6.3 Portland Cement Concrete (ECQ Pavements: Recommendations for Portland Cement Concrete pavement structural sections are presented in the "Recommendation" section of this report. The structural sections were designed in -accordance with Chapter 600 of the California Department of Transportation Highways Design Manual (fourth edition). The analysis was based on traffic index values ranging from 9.0 to 13.0. Vehicle loading (traffic index) values should be determined by the project civil engineer or applicable design professional. If more frequent or I-15/SR 74 Separation November 15, 2006 7.0 RECOMMENDATIONS D050C4.06-02 Page 9 The Planning Study indicates that the on and off ramps for Interstate 15 will be widened approximately 8 to 13 feet in order to provide additional turning lanes and entry lanes for interstate 15. In addition the west and east bound lanes of Central Avenue (State Route 74) will be widened approximately 8 to 50 feet in order to provide additional east and west bound travel lanes. It is our understanding that the proposed lane widening will consist of a combination of portland cement concrete and asphaltic concrete pavements. It is our understanding that new retaining walls are proposed for the lane widening portion of State Route 74 at the Interstate 15 overpass. This report does not provide recommendations for retaining walls. Those recommendations will be provided in a separate Foundation report. Due to ,the variance in R -value test results of the in-place soils encountered separate recommendations for pavement design have been included for the Central Avenue (State Route 74) widening from station 10+00 to station 17+00 and the areas including both the Interstate 15 on and off ramps and the Central Avenue (State Route 74) widening from station 17+00 to 36+61. The results of the structural pavement sections are listed in Table 1 and Table 2 listed in the recommendations section of this report. In general, as indicated on the Log of Test Borings, in the geotechnical report prepared for an adjacent retail development, and the November 2005 investigation for the proposed retaining walls the near surface soils along the existing roadways and the soils comprising the existing embankment are granular, cohesionless soils such as sands and silty sands. Final pavement section plans should be feviewed by a qualified geotechnical engineer to evaluate the proposed construction, drainage conditions, and other geotechnical design parameters. The following recommendations have been prepared for the proposed roadway widening and underground utilities based on the currently available data and engineering assumptions. 7.1 Genera 7.1.1 A plan should be developed by the Contractor to identify existing improvements which will require removal and outline the method of removal and documentation to allow proper preparation and backfilling. As a minimum, this plan should show the existing improvements planned for removal such as the underground utilities (if any). These elements shown on the demolition plan should be removed in their entirety and the resulting excavations backfilled with engineered fills under the observation of Twining. The plan should be provided to Twining for review prior to start of work. 7.1.2 A preconstruction meeting including, as a minimum, the owner, general contractor, paving subcontractors, and Twining should be scheduled by the general contractor at least one week .prior to the start of clearing and grubbing. The purpose of the meeting should be to discuss critical project issues, concerns and scheduling. I-15/SR 74 Separation November 15, 2006 DOSOC4.06-02 Page 10 7.1.3 The roadway widening improvements should, as a minimum, comply with the requirements of the California Department of Transportation (Caltrans), the project plans, specifications and the geotechnical report, whichever is most stringent. 7.1.4 Surface sheetflow drainage should be directed away from all excavations. Positive drainage should be established and maintained throughout the construction process. 7.1.5 It is the responsibility of the Contractor to provide safe working conditions with respect to excavation slope stability. Excavation stability should be monitored by the Contractor and/or Caltrans representatives, as applicable. In the event that excavation instability occurs, the owner, and all design professionals should be notified immediately by the Contractor. 7.1.6 The Contractor is responsible for compliance with the S WPPP requirements specified in the project plans, the project specifications, and the City of Lake Elsinore, whichever is most stringent. 7.1.7 The Contractor is responsible for including in the base bid the costs to perform the work required by the Geotechnical Report, the project plans, the project specifications, and the City of Lake Elsinore, whichever is most stringent. After review of the aforementioned documents, the Contractor(s) bidding on this project should determine if the data are sufficient for accurate bid purposes, if the data are not sufficient, the Contractor should conduct, or retain a qualified geotechnical engineer to conduct, supplemental studies and collect more data as required to prepare accurate bids. 7.1.8 The Contractor is responsible for protecting existing facilities from damage including but not limited to subdrainage systems (ifpresent), adjacent fences, buildings, streets, etc. Any damage shall be repaired by the Contractor at no cost to Home Depot. 7.2 Site Gradhag and_Drainag_e 7.2.1 It is critical to develop and maintain site grades which will drain surface and runoff away from pavements- both during and after construction. Adjacent exterior finished grades should be sloped a minimum of two (2) percent for a distance of at least five (5) feet away from the roadways, or as necessary to establish positive drainage and to preclude ponding of water adjacent to pavement sections. I-1 S/SR 74 Separation November I S, 2006 DOSOC4.06-02 Page 11 7.2.2 Surface water must not be allowed to pond adjacent to or within the pavement sections. To reduce this potential, it is recommended to provide positive drainage and drainage systems which direct all water into closed conduits that are connected to an acceptable discharge area away from the pavement sections, upon an impervious surface that will direct water away into a storm drain, or directly into the site storm drain system. 7.2.3 Landscape and planter areas should be irrigated using low flow irrigation (such as drip, bubblers or mist type emitters). The use ofplants with minimal water requirements are recommended. 7.2.4 Perimeter curbs should be extended at least 4 -inches into the compacted subgrade, i.e., below the aggregate, base section, where irrigated landscape areas meet pavements (if any). 7.3 Site Preparatiop 7.3.1 All existing subsurface improvements and/or undocumented fills which are encountered but not identified in this report should also be removed. Underground utilities to be removed should be completely removed and not crushed in place. Excavation should extend a minimum of 1 foot below bottom of existing improvements to be removed and the area of over - excavation should extend a minimum of 3 feet of each side of the physical improvement. The resulting excavations should be cleaned of all loose or organic material, the exposed native soils should be scarified to a minimum depth of 8 -inches then compacted as engineered fill, and the excavation backfilled with engineered fill. 7.3.2 All topsoil, vegetation, organics, water wells, utilities, and debris should be removed from the proposed lane widening improvement areas. The general depth of stripping should be sufficiently deep to remove the root systems and organic top soils. For bidding purposes, a minimum stripping depth of 6 inches should be assumed for the majority of the site. 7.3.3 The contractor should locate all on-site water wells. All wells scheduled for demolition should be abandoned per state and local requirements under the observation of Twining. The contractor should obtain an abandonment permit from the local environmental health department, and issue certificates of destruction to the owner and Twining upon completion. It is recommended that the well casing be removed to a minimum depth of 36 inches below the bottom of the planned aggregate base section. 7.3.4 If soil organic contents above 3 percent are encountered, the organic soils should be removed and not used or left in pavement areas, but may be suitable for landscape areas if approved by Caltrans. Roots (if encountered) I-151SR 74 Separation D050C4.06-02 November 15, 2006 Page 12 should not be disced into the soils. These materials should be raked and hand-picked, as necessary, to remove tree roots larger than Kinch in diameter and concentrated root masses. All roots larger than Kinch in diameter or any accumulation of organic matter that will result in an organic content more than 3 percent should be removed and not used as engineered fill. 7.3.5 Stripping should extend laterally a minimum of 3 feet outside the pavement perimeters. These materials will not be suitable for use as engineered fill; however, stripped topsoil may be stockpiled and used in landscape areas at the discretion of Caltrans. 7.3.6 Following the removal of existing site improvements and stripping operations, over -excavation should be conducted in the pavement areas and areas to receive fill to a minimum depth of 12 inches below the bottom of paveinent structural sections or to a depth of 12 inches below preconstruction site grades, whichever is deeper. 7.3.7 Upon observation and approval of the over -excavation limits by The Twining Laboratories, Inc., the soils at the bottom of the excavation should be scarified to a minimum depth of 8 inches and compacted as engineered fill to a minimum of 92 percent relative compaction. The resulting excavation should be backfilled to finished grades with engineered fill. 7.3.8 Areas proposed for exterior slabs (i.e. lightly loaded sidewalks, curbs, etc.) should be over -excavated to a minimum depth of 18 inches below preconstruction site grades or 12 inches below the aggregate base, whichever is greater. The limits of the over -excavation should extend a minimum of three (3) feet beyond the limits of the sidewalk. Upon observation of the bottom of the over -excavation by Twining, the exposed surface should be scarified to a minimum depth of 8 inches, moisture conditioned to at least one (1) and three (3) percent above optimum moisture content and compacted as engineered fill. The depth of scarification and compaction should not be included in the depth of engineered fill. 7.3.9 All fill required to bring the site to final grades should be placed as engineered fill. In addition, all soils over -excavated should be compacted as engineered fill. 7.3. 10 It is recommended that extra care be taken by the contractor to ensure that the horizontal and vertical extent of the over -excavation and compaction conform to the site preparation recommendations presented in this report. Twining is not responsible for measuring and verifying the horizontal and vertical extent of over -excavation and compaction. The contractor should verify in writing I-151SR 74 Separation D050C4.06-02 November 15, 2006 Page 13 that the horizontal and vertical over -excavation limits were completed in conformance with the recommendations of this report, the project plans, and the specifications (the most stringent applies). It is recommended that this verification be performed by a licensed surveyor. 7.3.11 It is recommended that prior to placement of asphaltic concrete adjacent to slabs -on -grade, curbs, and gutters, that the areas immediately adjacent to these features be compacted with equipment that can provide adequate compactive effort to the aggregate base adjacent to the vertical face of the concrete to achieve a dense, non -yielding condition. This compaction operation should be observed by Twining. 7.3.12 Open graded gravel, rock material (natural or crushed), stone, etc. shall not be allowed to be used as fill including any trench backfill (stormwater, sewer, water, electrical, phones, etc.) on this project. If the use of these materials are required by Caltrans, then the following requirements apply: l) each lift must be approved by our firm prior to placing the next lift, 2) all open graded materials shall be encased in a geotextile filter fabric, such as N irafi 140 N, to prevent migration of fine grained soils into the porous material and related settlement of surface improvements; 3) and the Contractor will be required to install concrete slurry collars at every transition in the pipeline and at locations directed by the project civil engineer and Twining (assume every 100 feet of pipeline as a minimum). 9. 4, 7.3.13 Final grading shall produce a subgrade ready to receive a structural pavement sections which is smooth, planar, and resistant to rutting. Both the finished subgrade (before aggregate base is placed) and the aggregate base section shall not depress more than one-half (%z) inch under the wheels of a fully loaded water truck. If depressions more than one-half (%) inch occur, the contractor shall perform remedial grading to achieve this requirement at no cost to the owner. 7.4 Ln;iveered Fill 7.4.1 The on-site soil material will be generally suitable for use as fill material, provided they are free of organics (roots less than'/4 inch in diameter and less than 3 percent by weight as determined by Lass -on -Ignition test), debris, and particles greater than 3 inches in diameter, and the moisture content of the soil is within one (1) to three (3) percent above optimum moisture content at the time of placement and can be compacted as engineered fill. 7.4.2 The compactability of the soils is dependent upon the moisture contents, subgrade conditions, degree of mixing, type of equipment, as well as other factors. The evaluation of such factors was beyond the scope of this report; therefore, they should be evaluated by the contractor during preparation of bids and construction of the project. I-I51SR 74 Separation November Y5, 2006 D050C4.06-02 Page 14 7.4.3 Import fill soils should be non -contaminated, non -corrosive, non -expansive and granular in nature and contain enough fine grained material (binder) to allow cutting "neat" footing trenches with the following acceptance criteria recommended. Percent Passing 3 -Inch Sieve 100 Percent Passing No. 4 Sieve 50-100 Percent Passing No. 200 Sieve 10-30 R -Value Minimum 30 Organics < 3% by weight Sulfates < 0.05 % by weight Min. Resistivity > 10,000 ohm -cm Prior to importing fill, the contractor shall submit test data that demonstrates that the proposed import complies with the recommended criteria. Also, prior to being transported to the site, the import material shall be certified by the contractor and the supplier (to the satisfaction of Caltrans and Twining) that the soils do not contain any environmental contaminates regulated by local, state or federal agencies. This certification should consist of, at a minimum, analytical data specific to the source of the import material. The list of analytical tests proposed for the import fill shall be provided to the owner and Twining for review and approval prior to conducting the analytical tests. Twining will sample and test the material after receipt of the analytical and geotechnical data from the Contractor. The contractor shall allow a minimum of seven (7) working days for each import source to be sampled and tested after the Contractor required data submittal is deemed complete by Twining. 7.4.4 Imported non -expansive fill soils should be placed in loose lifts approximately 8 inches thick, moisture -conditioned to within optimum to three (3) percent over optimum moisture content, and compacted to a dry density of at least 95 percent of the maximum dry density as determined by Caltrans Test Method 216. Additional lifts should not be placed if the previous lift did not meet the required dry density or if soil conditions are not stable. 7.4.5 Native soils used as engineered fill should be placed in loose lifts approximately 8 inches thick, moisture -conditioned to within optimum to three (3) percent above optimum moisture content, and compacted to a dry density of at least 95 percent of the maximum dry density as determined by Caltrans Test Method 216. I-15/SR 74 Separation November 15, 2006 D050C4.06-02 Page 15 7.4.6 Class 2 aggt egate base should be moisture -conditioned to within optimum to two (2) percent above optimum moisture content and compacted to a dry density of at least 95 percent of the maximum dry density as determined by Caltrans Test Method 216. 7.4.7 Open graded gravel, rock (crushed or natural) or stone shall not be used as backfill, including trench backfill, on this project. If the use of this material is required by Caltrans for improvements within their jurisdiction then the following minimum requirements apply: 1) the material should be placed in maximum 6 -inch thick lifts and compacted using a vibratory compactor to a non -yielding condition as determined by Twining; 2) each lift must be approved by Twining prior to placing the next lift; 3) all open graded materials should be completely encased in a geotextile filter fabric to prevent migration of fine-grained soils into the porous material. These requirements are in addition to any requirements imposed by Caltrans, whichever are the most stringent. 7.5 Asphaltic Concrete QAC) Pavements 7.5.1 It is our understanding that the improvements to the existing roadways include widening of Central Street and the north and south bound on and off ramps as noted on the January 31, 2005 plans prepared by Metro Pointe Engineers (Caltrans Permit No. 08 -04 -6 -CD -1422). At the request of Metro Pointe Engineers, the following pavement section recommendations were prepared for a range of traffic indexes ranging from 10.0 to 12.5. The project civil engineer should select the appropriate design based on the appropriate traffic index (TI). The following recommendations were based on a minimum R -value of 20 for the I-15 on and off ramp expansions and the widening of Central Avenue from station 17+00 to station 36+6I and a minimum R -value of 14 for the Central Avenue roadway expansion from station 10+00 to station 17+00. r 1-151SR 74 Separation November 15, 2006 D050C4.06--02 Page 16 Table No. 1 AC Pavement Sections for Road Widening Caltrans Right of Way I-15 On/Off Ramos and Central Avenue (State Route 741 from Station 17+00 to 36+61 {hr` o-'yS per.- _ ifff �� kr ;A F. 5tr 3' -r� '��:]e .v .� .• _ fa� •pp i'.a Two -la er 10.0 6 18 -- 12 Three -layer 10.0 6 9.5 9.5 12 Two -layer 10.5 6 19 -- 12 Three -layer 10.5 6 10 10 12 Two -layer 11.0 6.5 20.5 -- 12 Three -layer 11.0 6.5 11 10.5 12 Two -la er 11.5 7 21.5 -- 12 Three -layer 11.5 7 11.5 11 12 Two -layer 12.0 7.5 22.5 -- 12 Three -layer 12.0 7.5 11.5 12 12 Two -layer 12.5 8 `' 23.5 -- 12 -Three-layer - 12-5 12.5 12 AC - Asphaltic Concrete compacted to an average of 96 percent relative compaction (CA -375) AB - Class 2 Aggregate Base compacted to at least 95 percent relative compaction (CAL -216) ASB - Class 2 Aggregate Subbase compacted to at least 95 percent relative compaction (CAL -216) Subgrade - Subgrade soils compacted to at least 95 percent with moisture contents within optimum to three percent above optimum (CAL -216) 1 - The sections recommended above should be considered the minimum recommended thicknesses. If the existing structural sections are greater than the recommended pavement sections, the structural pavement sections should then match the existing thicknesses. 2 - I-15/SR 74 Separation November 1 S, 2006 'i J DOSOC4.06-05 Page 21 PCC Pavements with no Lateral Support Ti Pavement Componenttlt Thickness, Inches (mm) 9.0 to Jointed Plain Concrete Pavement 9.5(240) 9.5 Class 2 Aggregate Base* 12.0 (300) 9.5 to Jointed Plain Concrete Pavement 10.75 (270) 10 Class 2 Aggregate Base* 12.0 (300) 10.5 Jointed Plain Concrete Pavement 11.25 (285) to 11 Class 2 Aggregate Base* 15.5 (390) 11.5 Jointed Plain Concrete Pavement 11.25 (285) to 12 Lean Concrete Base*(') 4.75 (120) Class 4 Aggregate Subbase*() 7.0(180) 12.5 Jointed Plain Concrete Pavement 12.0 (300) to 13 Lean Concrete Base*(Z) 6.0(150) Class 4 Aggregate Subbase*(3) 8.25 (210) Uompactea to a minimum of 95 percent relative compaction (CAL -216) (1) Thicknesses shown for doweled pavements only. The thicknesses shown are not valid for non - doweled joint plain concrete pavements (2) per section 28 of the Caltrans Standard Specifications r (3) per section 25-102B of the Caltrans Standard Specifications 7.6.3 Stresses are anticipated to be greater at the edges and construction joints of the pavement section. A thickened edge is recommended on the outside of slabs subjected to wheel loads. "5 7.6.4 Joint spacing in feet should not exceed twice the slab thickness in inches, e.g., 12 feet by 12 feet for a 6 -inch slab thickness. Regardless of slab thickness, joint spacing should not exceed 15 feet. r 7.6.5 Lay out joints to form square panels. When this is not practical, rectangular panels can be used if the long dimension is no more than 1.5 times the short. 7.6.6 Control joints should have a depth of at least one-fourth the slab thickness, e.g., 1.5 -inch for a 6 -inch slab. 7.6.7 Isolation (expansion) joints should extend the full depth and should be used onlyto isolate fixedobjects abutting orwithinpaved areas. Constructionjoint location shouldbe determined by the contractor's equipment and procedures. 7.6.8 Pavement section design assumes that proper maintenance such as sealing and repair of localized distress will be performed on a periodic basis. I-15/SR 74 Separation: November 15, 2006 8.0 DESIGN CONSULTATION DOSOC4.06-05 Page 26 8.1.1 Twining should be provided the opportunity to review those portions of the contract drawings and specifications that pertain to earthwork operations, new pavements and underground utilities prior to finalization to determine whether they are consistent with our recommendations. This service is not a part of this current contractual agreement. 8.1.2 It is the client's responsibility to provide plans and specification documents for our review prior to their issuance for construction bidding purposes. 8.1.3 If Twining is not afforded the opportunity for review, Twining assumes no liability for the misinterpretation of our conclusions and recommendations. This review is documented by a formal plan/specification review report provided by Twining. 9.0 CONSTRUCTION MONITORING 9.1- It is recommended that Twining be retained to observe the excavation, earthwork, and compaction testing of work to determine that the subsurface conditions are compatible with those used in the analysis and design. 9.2 Twining can provide observation and field testing to determine if the recommendatidns of this report are achieved. Upon completion of the work, a written summary of our observations will be provided, field testing and conclusions regarding the conformance of the completed work to the intent of the project geotechnical report. This service is not, however, part of this current contractual agreement. 9.3 The construction monitoring is an integral part of this investigation. This phase of the work provides the geotechnical engineer the opportunity to verify the soil conditions and make alternative recommendations if the conditions differ from those anticipated. 9.4 If Twining is not afforded the opportunity to provide engineering observation and field-testing services during construction activities related to earthwork, pavements and trenches; then, Twining will not be responsible for compliance of any aspect of the construction with our recommendations or performance of the structures or improvements if the recommendations of this report are not followed. We recommend that if a firm other than Twining is selected to conduct -these services that they provide evidence of professional liability insurance of at least $3,000,000 and review this report. After their review, the firm should, in writing, state that they understand and agree with the conclusions and recommendations of this report and agree to conduct sufficient observations and testing to ensure the construction complies with this report's recommendations. Twining should be notified, in writing, if another firm is selected to conduct observations and field-testing services prior to construction. I-15/SR 74 Separation November 15, 2006 D050C4.06-05 Page 27 9.5 Upon the completion of work, a final report should be prepared by Twining. This report is essential to ensure that the recommendations presented are incorporated into the project construction, and to note any deviations from the project plans and specifications. The client should notify Twining upon the completion of work to provide this report. This service is not, however, part of this current contractual agreement. 10.0 NOTII<ICAT.ION AND LIMITATIONS 10.1 The conclusions and recommendations presented in this report are based on the information provided regarding the proposed construction, and the results of the laboratory testing. 10.2 If variations or undesirable conditions are encountered during construction, Twining should be notified promptly so that these conditions can be reviewed and the recommendations reconsidered where necessary. It should be noted that unexpected conditions frequently require additional expenditures for proper construction of the project. 10.3 If the proposed construction is relocated or redesigned, or if there is a substantial lapse of time between the submission of our report and the start of work (more than 12 months) at the site, or if conditions have changed due to natural cause or construction operations at or adjacent to the site, the conclusions and recommendations contained in this report should be considered invalid unless"the changes are reviewed and our conclusions and recommendations modified or approved in writing. 10.4 Changed site conditions, or relocation ofproposed structures, may require additional field and laboratory investigations to determine if our conclusions and recommendations are applicable considering the changed conditions or time lapse. 10.5 The conclusions and recommendations contained in this report are valid only for the project discussed in Section 3.0 of this report. The use of the information and recommendations contained in this report for improvements not discussed herein or for improvements on other sites not discussed in this report is not recommended. The entity or entities that use or cause to use this report or any portion thereof for another improvement or site not covered by this report shall hold Twining, its officers and employees harmless from any and all claims and provide Twining's defense in the event of a claim. 10.6 This report is issued with the understanding that it is the responsibility of the client to transmit the information and recommendations of this report to developers, owners, buyers, architects, engineers, designers, contractors, subcontractors, and other parties having interest in the project so that the steps necessary to carry out these recommendations in the design, construction and maintenance of the prof ect are taken by the appropriate party. Y 1 S/SR 74 Separation November 15, 2006 DOSOC4.06-02 Page 27 10.7 Our professional services were performed, our findings obtained, and our recommendations prepared in accordance with generally -accepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied 10.8 This investigation report should not be used in the preparation of a Storm Water Pollution Prevention Plan (SWPPP). Use of this report or any data included in the report in preparation of a SWPPP would be at the owner's sole risk. 10.9 Reliance on this report by a third party (i.e., that is not a party to our written agreement) is at the party's sole risk. If the project and/or site are purchased by another party, the purchaser must obtain written authorization and sign an agreement with Twining in order to rely upon the information provided in this report for design or construction of the project. We appreciate the opportunity to be of service to Home Depot U.S.A., Inc. If you have any questions regarding this report, or if we can be of further assistance, please contact us at your convenience. Sincerely, THE TWINING LABORATORIES, INC. Geotechnical Engineering Division De gerwood II Staff Geologist �Q�O�ES5lOy f�c Read L. Andersen, RCE Manager N0.60725 p EXP- 114F XP.11 t7F C A. 1- VVP/KIC//HDM/id CADocuments and Settings\VanessaVEocal Settingffemp\WOC4.06-03 Revised FinaI MaterialsReport (revised 11-15-06).wpd A-1 APPENDIX A DRAWINGS Drawing No. 1 - Site Location Map Drawing No. 2 - R -Value Sample Location Map D050C4.06 . 4. ••t y ��.-`• ... _ � -tel ���T� � ��••!fn �t "�. .}, .r 'i�� it .r F /. _•_ ...• ; j•„ :��j a xa _ !` •r- Ie \�. � :-"'�;�� `` r� ��� sn�a �,.�� ate. �4•.%axe •`"� ��� Zr SITE a•=� aFP � s It �"'..—�f� �,�.• UM 1275 �{ .� ' - _ i • � � �Lgetla � .� w � � � `.' � ` mss•., Fes:: .r.!•', - -J 1t•. - -�fivd kEflOSfI[ "�" \1 J R c c r r - � "Ir*1—n ,� �`• `'1 c. i, r, a`�+ L mfr, ' `� �' _7 ' 1 •1r 1 �i �ia�t•�f,. .� 1 , ��n-•.�'..r.�--�:��'�a��i„-�� --'----�' - - --.._. - _, -:•r Vit? ; _ <:,,, . '" �:. ." � - - :�ti �•• ------�'".�i i �• ..rte•-� - � •; . ` rr•: • �' y Cwt ,tn_ - - x_F'YP_`---- Tom==— SOURCE: U.S.G.S. 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