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City of Santa Ana RFP No. 19-090 Professional Land Surveying Services umentation and Corner Records will be prepared to meet the requirements of both the City of Santa Ana and the County of Orange. Topographic Surveys Towill's primary business is land surveying and map- ping. Along with our extensive field and office survey staff, we also have an in-house photogrammetry group of professionals that enables us to perform mapping tasks using either ground- or aerial -based surveying methods, or a combination of the two. This allows us to most efficiently address the client's needs. Because our internal staff work together on every job, and on such a wide range of project types, we have full knowledge of which methods are most suitable to the task at hand, and how to communi- cate efficiently to develop a full understanding of your needs and how best to serve you. Planning is the most important tool to economically serve a project with a variety of field and office activi- ties. Towill performs field topographic surveys for de- sign to produce maps at a wide range of scales, using both GPS and conventional surveying equipment and techniques. Such surveys are typically performed to produce a detailed map for engineering design or as supplemental data collection to enhance and com- plete photogrammetric mapping. We have experience performing virtually every type of field topographic surveying task, including: • Detailed site surveys for design and construction purposes (including location of surface and underground utilities, monitoring wells, curb and gutter lines, and building pad elevations); • Cross-section and profiling along rivers, canals, and levees for hydraulic analysis and design; • Surveys of bridges and surrounding topography; • Surveys of tunnels and the interior of large diameter pipelines; and • Surveys to check and complement photogrammetric mapping. For many of our clients, Towill has conducted multiple site topographic surveys. We have in-house access to some of the latest technology available for these types of tasks. Utilizing robotic one-man instruments allows us to have more experienced field staff con- ducting our topographic data acquisition. With very T TOWINLL Kl precise and accurate measuring devices, we often uti- lize reflectorless technology to acquire the information needed within streets and other areas of heavy traffic without impeding traffic flow. Whether the site is large or small, with Towill's unique capability to complete photogrammetric compilation in house, we will be able to find the most economical solution to your needs. Photogrammetric Mapping Photogrammetric mapping is the process by which aerial photography is used to produce planimetric and topographic maps of the earth's surface and features of the manmade environment. Photogrammetric mapping represents a very important business line for Towill, accounting for an average of 35% of our company's annual revenue. Moreover, photogram- metric mapping is not an ancillary professional service at Towill; many of our most highly accomplished and experienced personnel have dedicated their careers to advancing Towill's photogrammetry operations and providing a level of service far above the competition. Prior to the execution of the primary data collection mission described herein, Towill will either recov- er and target existing ground control positions, or, if needed, establish and target new ground control positions throughout the AOL Using the digital image, ground control, and ABGPS/IMU data, Towill will pre- pare a Fully Automated Analytical Aerotriangulation (FART) solution to establish supplemental control for orienting individual photogrammetric stereo -models covering the entire AOL Upon completion of the FAAT solution, survey/map documents, such as planimetric features, contours, or color orthophotography, can be prepared as -needed anywhere and at any time within the AOL Boundary and Right of Way Surveys Towill has extensive experience and expertise in boundary and property surveys for land and parcel determination, performing tens of thousands of sur- veys over our 64-year history. The initial step to any successful boundary survey is performing the proper research of land records. Public records research is required to identify primary control, right-of-way infor- mation, and boundary lines, or lines of occupation, before performing the work. Research may be per- formed at city or county offices, utility agencies, title Submitted October 24, 2019 16