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Scope of Services and Schedule
<br />Scope of Work
<br />Research and Data Collection
<br />Towill routinely conducts a variety of project -related
<br />research, such as title reports, APN/property own-
<br />ership review, zoning, benchmarks, boundary con-
<br />trol, and FEMA documents, to name a few. Through
<br />decades of experience, we know which agencies to
<br />contact for each specific type of document, what the
<br />processes and lead times are for obtaining them, and
<br />what potential challenges to expect. Research may be
<br />performed at city or county offices, utility agencies, or
<br />other appropriate sources.
<br />Vertical and Horizontal Control
<br />Horizontal and vertical control is the backbone of any
<br />successful survey project. The placement of control
<br />point locations is carefully evaluated to determine the
<br />most efficient method of performing the project tasks.
<br />Existing maps and photography, city and county
<br />maps, and available historic maps are studied to de-
<br />termine how to refine control point locations to better
<br />serve each project and make the working conditions
<br />safe for the field staff. Whenever possible, the control
<br />points are located on or near roads, trails, levees, or
<br />other common routes of transportation. Special efforts
<br />are taken to obtain appropriate permission to access
<br />private and/or government properties.
<br />Towill is experienced in conducting conventional
<br />surveys, monitoring surveys, precise digital geodetic
<br />leveling, and GPS static surveys, as well as establish-
<br />ing local project control. We have set up thousands of
<br />control networks and are well -versed in tying into and/
<br />or expanding existing control networks. Our staff have
<br />decades of experience with a wide variety of coordi-
<br />nate systems and the expertise to know which ones
<br />apply to each project.
<br />We regularly perform static, rapid -static, kinematic
<br />and real-time kinematic (RTK), and real-time network
<br />(RTN) GPS surveys to establish ground control, de-
<br />pending on the requirements for the project. We own
<br />and use Trimble dual -frequency GPS receivers. Static
<br />and fast static sessions are used to establish primary
<br />control stations; fast -static and kinematic sessions
<br />are used for secondary control. The Towill Team is
<br />well -versed in utilizing GPS methods for establishing
<br />Submitted October 24, 2019
<br />13
<br />City of Santa Ana RFP No. 19-090
<br />Professional Land Surveying Services
<br />vertical control and deformation monitoring to various
<br />standards, including the National Geodetic Surveys.
<br />Moreover, Towill has extensive experience in the
<br />performance of geodetic surveys and is very familiar
<br />with working in the most current national datums;
<br />e.g., the North American Datum of 1983 (NAD83),
<br />2011 (2010), and the North American Vertical Datum
<br />of 1988 (NAVD88). We also have a world-renowned
<br />geodetic expert on staff to lead any specialty or high
<br />accuracy survey efforts, if needed. Towill's team of
<br />professional licensed surveyors are keenly aware and
<br />always up to date with technical issues relating to
<br />the evolution of geodetic datums, geodetic surveying
<br />technologies, and associated standards and proce-
<br />dures.
<br />Legal Descriptions, Plats, and Maps
<br />Towill has extensive experience and expertise in
<br />boundary and property surveys for land and parcel
<br />determination, performing tens of thousands of sur-
<br />veys over our 63-year history. The initial step to any
<br />successful boundary survey is performing the proper
<br />research of land records. Public records research is
<br />required to identify primary control, right-of-way infor-
<br />mation, and boundary lines, or lines of occupation,
<br />before performing the work. Research may be per-
<br />formed at city or county offices, utility agencies, title
<br />companies, or other appropriate sources. Necessary
<br />records are identified, organized, and analyzed for the
<br />field and office tasks.
<br />Once the research is complete and all documentation
<br />associated with a boundary has been analyzed, we
<br />can prepare highly accurate calculations of where we
<br />can expect to locate monumentation associated with
<br />the boundary determination. Throughout the course of
<br />the field survey (which utilize both GPS and conven-
<br />tional survey techniques), adjustments can be made
<br />to further enhance the accuracy of the search loca-
<br />tions and minimize the amount of field time required
<br />to complete the survey. When survey results are
<br />returned from the field, they are compared to record
<br />deeds and maps and the boundary analysis is per-
<br />formed. With years of experience, we can efficiently
<br />and accurately complete the boundary process, com-
<br />P TOWINLL
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