Res 2024-219 approving an On-Call Agreement with Tetra Tech, Inc., for engineering design, bid and construction phase services for the Wallace Addition Subdivision Improvements Project, in an amount not to exceed $2,000,000.00

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Docusign Envelope ID: BB27E2CA-90E7-44DF-ACD6-60284C2E92F6 Mr.Jaime R. Kypuros,Jr.,PE City of San Marcos Wallace Subdivision August 13,2024 SGT 24 1041 the cohesive soils and Standard Penetration Tests (SPT) in cohesionless soils. Continuous rock coring is not included in our scope of work. Groundwater data will be obtained during and immediately after drilling,if encountered. Upon completion of drilling and groundwater readings, boreholes will be backfilled using soil cuttings and bentonite pellets to match existing grade, and patch with asphalt. Dynamic Cone Penetration (DCP) tests will be performed on subgrade at four (4) select boring locations. • Laboratory Tests: Laboratory index tests will be performed on select soil samples recovered from the test borings. The index tests will include Atterberg limits, percent passing no. 200 sieve, moisture content, unconfined compressive strength and corrosivity (pH, Sulfate, Chloride, Resistivity) tests. The collected field and laboratory data will be interpreted and used to develop geotechnical investigation report for the project. The report will include the following specific items: • Site vicinity map, • Geology map, • Plan of borings, • Boring logs, • Field and Laboratory test results summary, • Recommendations for open-cut installation of the utility lines, • Trench safety recommendations, • Pipe bedding and backfill recommendations, and • General discussion of construction and excavation recommendations. The above-described report will be prepared by an engineer specializing in soil mechanics after reviewing available boring and laboratory data. Pavement Design Scope HVJSCTx will prepare pavement designs for this project in accordance with the City of San Marcos guidelines using geotechnical data. Falling Weight Deflectometer (FWD) tests will be performed along the residential streets to evaluate full depth reconstruction and rehabilitation requirements. We understand the City of San Marcos will provide available traffic data for the pavement design. Because the current conditions and unknown historical pavement materials along the existing roads, HVJSCTx proposes to utilize nondestructive deflection testing (NDT) with the Falling Weight Deflectometer (FWD) to calculate subgrade design parameters. The data may also be used to finalize boring locations to be able to collect representative geotechnical data concerning existing pavement layer thicknesses, base layers, and in-situ subgrade conditions identified in deflection profile plots using the NDT data. We will submit a signed and sealed pavement design report Tetra Tech. The pavement design report must be reviewed and approved by the City of San Marcos prior to its implementation. The