Common use of Geotechnical Engineering Clause in Contracts

Geotechnical Engineering. Atlas Technical Consultants will provide geotechnical engineering services for the project as a subconsultant to us. A copy of ▇▇▇▇▇’s proposal to provide geotechnical engineering services is attached. Geotechnical engineering will be performed in accordance with the requirements of the Fort Bend County Engineering Design Manual and will include: • Drilling a total of six (6) soil borings within the path of the proposed sidewalks (maximum spacing of 500 feet) to a depth of ten (10) feet each. The borings will be drilled using a truck-mounted drill rig and support vehicle. Undisturbed cohesive soil samples will be obtained using 3-inch diameter thin-walled tube samplers pushed in the soil. Non-cohesive soil samples will be obtained using split-barrel samplers used in conjunction with the standard penetration test (SPT). Groundwater readings will be obtained as the boring is advanced and following completion of drilling, as possible. Upon completion of drilling operations, borings will be backfilled with soil cuttings at the surface. • Determining the relative density/consistency of the soil in general accordance with the Standard Penetration Test (SPT) (ASTM D 1586) and/or Shelby tube (ASTM D 1587). • Marking boring locations using hand-held GPS or normal taping procedures prior to drilling so that both sides of the roadway are addressed. Boring locations will be added to site plans. • Laboratory testing to evaluate the engineering properties of the soil and/or rock using tests performed on selected representative samples. The samples will be visually examined and classified. The following tests will be performed: - Moisture content - Atterberg Limits (for cohesive soils) - Percent passing a No. 200 sieve - Soil classification according to USCS - Shear strength with pocket penetrometer (for cohesive soils) • Analyzing the field and laboratory data to develop geotechnical recommendations. • Preparation of an engineering report to include: ▇▇. ▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇, P.E. County Engineer Fort Bend County Page 5 November 25, 2024 - Transmittal letter with professional engineer’s seal and approval signatures - Executive summary - Introduction - Purpose and scope of work - Site exploration - Field work - Laboratory testing results - Description of subsurface soil and groundwater conditions - Engineering analysis and recommendations - Construction considerations - Appendices containing: o Site vicinity map o 11”x17” boring location map o Laboratory test results o Boring logs o Soil profile drawings o Engineering data • Providing a final engineering report in PDF format. A geologic fault study is not included in the geotechnical analysis as it is not necessary for this type of work.

Geotechnical Engineering. Atlas Technical Consultants 1. Engineer’s subconsultant will provide geotechnical engineering services for stake the project as a subconsultant boring locations in the field prior to usthe subsurface investigation. A copy of ▇▇▇▇▇’s proposal to provide geotechnical engineering services is attached. Geotechnical engineering The “Texas 811 System” will be performed in accordance with notified to locate underground utilities within the requirements proximity of the Fort Bend County Engineering Design Manual boring locations. 2. PCCA shall perform due diligence to assure Engineer that the boring locations are accessible and will include: • Drilling a total clear of six (6) soil borings within the path of the proposed sidewalks (maximum spacing of 500 feet) to a depth of ten (10) feet eachprivate utilities and obstructions, such as piping, fences, heavy brush, shrubs, and trees. The borings will be drilled using relocated if necessary. 3. Engineer to recommend scope of work to complete the necessary geotechnical studies pending results of the Preliminary Design Phase for PCCA approval. The scope of work assumed for this service order generally includes the following, but may be modified pending results of the Preliminary Design Phase: a. Seven (7) test borings. Three (3) borings will be completed to a truckdepth of 60- feet and four (4) borings will be completed to a depth of 25-mounted drill rig feet. b. Soil and support vehicle. Undisturbed cohesive soil rock samples will be obtained using 3at 2-inch diameter thinfoot intervals to 10-walled tube samplers pushed in the soil. Nonfeet and 5-cohesive soil samples will be obtained using split-barrel samplers used in conjunction with the standard penetration test (SPT). foot intervals thereafter. c. Groundwater readings will be obtained as the boring is advanced during drilling and following immediately upon completion of drilling, as possible. Upon completion of the drilling operations, borings . Boreholes will be backfilled with soil cuttings at from the surface. • Determining field exploration with excess cuttings spread across the relative density/consistency ground surface near the boring location. d. The laboratory testing may consist of the soil in general accordance with the Standard Penetration Test (SPT) following: • Supplementary visual classification (ASTM D 1586D2487) and/or Shelby tube • Moisture content (ASTM D 1587). D2216)‌ • Marking Atterberg limits (ASTM D4318) • Percent material finer than the #200 sieve (ASTM D1140)‌ • Unconfined compressive strength (ASTM D2166) • One-dimensional swell (ASTM D4546) All field and laboratory test results will be included on the boring locations using hand-held GPS logs or normal taping procedures prior in the completed report. e. In addition to drilling so the field and laboratory testing, a geotechnical engineering report will be prepared that both sides includes a description of the roadway are addressed. Boring locations will be added to site plans. • Laboratory testing to evaluate field exploration and laboratory tests, boring logs, a discussion of the engineering properties of the soil and/or rock using tests performed on selected representative samples. subsurface materials encountered, as well as foundation recommendations for the proposed structure. f. The samples final Geotechnical Engineering Report will be visually examined and classified. The following tests will be performed: - Moisture content - Atterberg Limits (for cohesive soils) - Percent passing a No. 200 sieve - Soil classification according to USCS - Shear strength with pocket penetrometer (for cohesive soils) • Analyzing the field and laboratory data to develop geotechnical recommendations. • Preparation of an engineering report to include: ▇▇. ▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇, P.E. County Engineer Fort Bend County Page 5 November 25, 2024 - Transmittal letter with professional engineer’s seal and approval signatures - Executive summary - Introduction - Purpose and scope of work - Site exploration - Field work - Laboratory testing results - Description of subsurface soil and groundwater conditions - Engineering analysis and recommendations - Construction considerations - Appendices containing: o Site vicinity map o 11”x17” boring location map o Laboratory test results o Boring logs o Soil profile drawings o Engineering data • Providing a final engineering report in PDF format. A geologic fault study is not included in the geotechnical analysis as it is not necessary for this type of work.ready approximately three

Geotechnical Engineering. Atlas Technical Consultants Stantec will provide use Terracon as our subconsultant for geotechnical engineering services engineering. The field exploration consists of borings at 26 locations – four (4) for the project as a subconsultant to us. A copy of ▇▇▇▇▇’s proposal to provide geotechnical engineering services is attached. Geotechnical engineering will be performed in accordance with the requirements of the Fort Bend County Engineering Design Manual and will include: • Drilling a total of six (6) soil borings within the path of the proposed sidewalks (maximum spacing of 500 feet) to a depth of ten (10) feet each. The borings will be drilled bridges using a truck-mounted drill rig and support vehicle. Undisturbed cohesive soil samples will be obtained using 3-inch diameter thin-walled tube samplers pushed in the soil. Non-cohesive soil samples will be obtained using split-barrel samplers used in conjunction with the standard penetration test (SPT)) at a dept of 75 to 100 feet and 22 for the roadway using a hand auger at a depth of five (5) feet or auger refusal. Groundwater readings Handheld GPS equipment will be used to locate borings with an estimated horizontal accuracy of +/-20 feet. Field measurements from existing site features may be utilized. If available, approximate elevations will be obtained by interpolation from a site specific, surveyed topographic map. Soil borings will be advanced with a track-mounted drill rig using mud rotary drilling techniques. Five samples will be obtained in the upper 10 feet of each boring and at intervals of 5 feet thereafter. Soil sampling is typically performed using thin-wall tube and/or split-barrel sampling procedures. The split-barrel samplers are driven in accordance with the SPT. The samples will be placed in appropriate containers, taken to the soil laboratory for testing, and classified by a Geotechnical Engineer. In addition, groundwater levels during drilling and sampling will be observed and recorded. Field boring logs will be prepared as the boring is advanced part of standard drilling operations including sampling depths, penetration distances, and following completion other relevant sampling information. Field logs include visual classifications of materials encountered during drilling, as possibleand our interpretation of subsurface conditions between samples. Upon completion of drilling operationsFinal boring logs, prepared from field logs, represent the Geotechnical Engineer's interpretation, and include modifications based on observations and laboratory tests. Hand Auger (HA) Borings are conducted in general accordance with ASTM D 1452-80, Standard Practice for Soil Investigation and Sampling by Auger Borings. In this test, hand auger borings are drilled by rotating and advancing a bucket auger to the desired depths while periodically removing the auger from the hole to clear and examine the auger cuttings. The soils are classified in accordance with ASTM D2488. The borings will be backfilled with soil auger cuttings at the surfaceupon completion. • Determining the relative density/consistency This does not include repair of the soil site beyond backfilling the boreholes. Excess auger cuttings will be dispersed in the general accordance with the Standard Penetration Test (SPT) (ASTM D 1586) and/or Shelby tube (ASTM D 1587). • Marking boring locations using hand-held GPS or normal taping procedures prior to drilling so that both sides vicinity of the roadway are addressedborehole. Boring locations Because backfill material often settles below the surface after a period, we recommend boreholes to be periodically checked and backfilled, if necessary. The field data will be added reviewed and assigned laboratory tests to site plans. • Laboratory testing to evaluate understand the engineering properties of the various soil and/or rock using strata. Exact types and number of tests performed on selected representative samplescannot be defined until completion of field work. The anticipated laboratory testing may include the following: • Water content • Grain size analysis • Chemical analyses – pH, Sulfates, Chloride Ion, Electrical Resistivity • CBR test Based on the material’s texture and plasticity, soil samples will be visually examined described and classifiedclassified in accordance with the Unified Soil Classification System (USCS). The following tests A geotechnical engineering report will be performedsigned and sealed by a professional engineer and include the following: - Moisture content - Atterberg Limits (for cohesive soils) - Percent passing a No. 200 sieve - Soil classification according to USCS - Shear strength • Boring logs with pocket penetrometer (for cohesive soils) • Analyzing the field and laboratory data to develop geotechnical recommendations. • Preparation of an engineering report to include: ▇▇. ▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇, P.E. County Engineer Fort Bend County Page 5 November 25, 2024 - Transmittal letter with professional engineer’s seal Stratification based on visual soil classification • Site Location and approval signatures - Executive summary - Introduction - Purpose and scope of work - Site Exploration Plans • Subsurface exploration - Field work - Laboratory testing results - procedures • Description of subsurface soil conditions • Recommended foundation options and groundwater conditions - Engineering analysis and engineering design parameters • Estimated settlement of foundations • Seismic site classification • Subgrade preparation/earthwork recommendations - Construction considerations - Appendices containing: o Site vicinity map o 11”x17” boring location map o Laboratory test results o Boring logs o Soil profile drawings o Engineering data • Providing a final engineering report in PDF format. A geologic fault study is not included in the geotechnical analysis as it is not necessary for this type of work.Lateral earth pressure recommendations

Geotechnical Engineering. Atlas Technical Consultants FNI will provide geotechnical engineering services support for the project as a subconsultant design of concrete pavement (permanent), asphalt pavement (temporary), foundation support recommendations for two (2) culverts and retaining walls (up to us. A copy of ▇▇▇▇▇’s proposal to provide geotechnical engineering services is attached. Geotechnical engineering will be performed 10 feet in accordance with the requirements of the Fort Bend County Engineering Design Manual and will include: • Drilling a total of six (6) soil borings within the path of the proposed sidewalks (maximum spacing of 500 feet) to a depth of ten (10) feet each. The borings will be drilled using a truck-mounted drill rig and support vehicle. Undisturbed cohesive soil samples will be obtained using 3-inch diameter thin-walled tube samplers pushed in the soil. Non-cohesive soil samples will be obtained using split-barrel samplers used in conjunction with the standard penetration test (SPTheight). Groundwater readings will It should be obtained as noted that the boring is advanced and following completion geologic atlas of drilling, as possible. Upon completion of drilling operations, borings will be backfilled with soil cuttings at Texas indicates that the surface. • Determining the relative density/consistency of the soil in general accordance with the Standard Penetration Test (SPT) (ASTM D 1586) and/or Shelby tube (ASTM D 1587). • Marking boring locations using hand-held GPS or normal taping procedures prior to drilling so that both sides of the roadway are addressed. Boring locations will be added to site plans. • Laboratory testing to evaluate the engineering properties of the soil and/or rock using tests performed on selected representative samples. The samples will be visually examined and classified. The following tests will be performed: - Moisture content - Atterberg Limits (for cohesive soils) - Percent passing a No. 200 sieve - Soil classification according to USCS - Shear strength with pocket penetrometer (for cohesive soils) • Analyzing the field and laboratory data to develop geotechnical recommendations. • Preparation of an engineering report to include: ▇▇. ▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇▇ formation occurs in the northern half of the project limits and the Woodbine formation occurs in the southern half of the project limits. This is mentioned since the pavement subgrade could be different between these two formations and may require different approaches to pavement subgrade treatment. The following geotechnical engineering work will be completed: • Field Exploration o Select and mark up to eight (8) boring locations and notify Texas 811 and CITY departments to request location and marking of existing underground utilities prior to the field exploration. o Due to limited ROW outside the roadway, P.E. County the borings will be drilled through the existing pavement. Traffic control will be set up to close one lane of traffic and route vehicles around the drilling zone. We are anticipating flagmen will be needed to direct the traffic. If areas of ROW are available and clear of existing utilities, the boring will be drilled off the pavement. o Subcontract with a geotechnical drilling contractor to drill up to eight (8) borings to a depth of 20 feet. Samples will be collected intermittently using continuous flight augers and either split-spoon or tube samplers. Rock and rock-like materials will be tested insitu using a TxDOT Cone Penetration Test, as appropriate for the material. At completion, the boreholes will be backfilled with auger cuttings and the pavement patched (borings drilled through pavement). o Provide an Engineer Fort Bend County Page 5 November 25or Geologist experienced in logging borings to direct the drilling, 2024 - Transmittal letter log the borings, and handle and transport the samples. Visual classification of the subsurface stratigraphy shall be provided per the Unified Soil Classification System (USCS). • Laboratory Testing o Testing shall be performed on samples obtained from the borings to determine soil classification and pertinent engineering properties of the subsurface materials. FNI will select samples for laboratory testing, assign tests, and review the test results. Testing will be performed by a geotechnical testing subcontractor. o Laboratory tests will be assigned based on the specific subsurface materials encountered during exploration. Test type and quantity may vary, but are expected to include: a. Classification tests (liquid and plastic limits and percent passing the no. 200 sieve or gradation) b. Moisture content c. Dry unit weight d. Unconfined compressive strength e. One-dimensional swell (restrained) f. pH lime determination g. Soluble sulfate content • Engineering Analysis o Prepare a geotechnical report of the investigation to include: a. Appendix with professional engineer’s seal the boring locations, boring logs, laboratory test results, and approval signatures - Executive summary - Introduction - Purpose and scope of work - Site exploration - Field work - Laboratory testing results - Description a key to the symbols used. b. Discussion of subsurface conditions and soil properties indicated by the field and groundwater laboratory work, and the implications for design. c. Foundation support recommendations for two (2) culverts and the retaining wall. d. Lateral earth pressures will be provided for design of the retaining wall and culvert walls. e. A global stability calculation will be made for the retaining wall for the maximum height, if needed. Depending upon depth to rock and depth of wall, it may be determined that the proposed wall foundation support is not susceptible to a slope failure. This will be evaluated for the specific site conditions - Engineering analysis and recommendations - Construction considerations - Appendices containing: o Site vicinity map o 11”x17” boring location map o Laboratory wall location. If slope calculations are needed, soil shear strength will be estimated using the soil classification test results o Boring logs o Soil profile drawings o Engineering data • Providing a final engineering report in PDF format. A geologic fault study is not included in and published correlations. f. Pavement thickness calculations and subgrade treatment recommendations will be provided. g. General discussion of expected construction-related issues. h. Earthwork-related recommendations for use during development of the geotechnical analysis as it is not necessary for this type of workplans and specifications.