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for roads, sewer, water, storm drain, or grading,
<br />will require a swift response to avoid costly delays
<br />in construction. Towill often works in a survey con-
<br />struction management capacity and has developed
<br />profession -leading, efficient methods for work perfor-
<br />mance. Field crews are equipped with pre calculated
<br />horizontal and vertical alignments so that offsets can
<br />be determined at the time of staking and so that cuts
<br />and fills can be compared to design data at the point
<br />of collection. Many of Towill's survey crews are head-
<br />ed up by experienced LSITs with the ability to perform
<br />field calculations, field inspections, and problem -solv-
<br />ing when the need arises. All verification data is trans-
<br />ferred to Towill's database for secondary accuracy
<br />checks by office personnel.
<br />Limits of removal are staked based on approved plans
<br />and/or visual inspection in the field. Our crews have
<br />enough experience at this exercise to realize when
<br />things appear to be either insufficient or excessive. If
<br />it is believed that the removal limits either exceed or
<br />are inadequate for construction, we will advise City
<br />staff. The limits can be staked either at the actual
<br />location, such as paint on curb, or on an offset that
<br />can be used later for construction, thereby saving time
<br />and money.
<br />Examples of QA/QC steps for construction layout
<br />are calculating points from different starting points,
<br />comparing station and offset listings with plan sets,
<br />and graphic checks for irregularities. In the field,
<br />comparisons are made to existing structures, and the
<br />relationship of reference points are verified visually
<br />as they are set. As -staked shots are taken on points
<br />set to compare coordinates to the original calculated
<br />positions. Different personnel are called to examine
<br />items throughout the process to provide an indepen-
<br />dent check.
<br />Monument Preservation
<br />In keeping with Section 8771 of the California Busi-
<br />ness and Professions Code, Towill recognizes how
<br />critically important accurate and enduring survey mon-
<br />umentation and control is to the survey operations of
<br />both the City and the surveying community. Without
<br />the perpetuation of controlling monuments, countless
<br />additional hours of field and office work can occur for
<br />both public- and private -sector projects.
<br />Every project we undertake begins with a thorough
<br />Submitted October 24, 2019
<br />15
<br />City of Santa Ana RFP No. 19-090
<br />Professional Land Surveying Services
<br />review of not only record information but also of the
<br />proposed construction in the area. Our project man-
<br />ager organizes the investigation into existing recorded
<br />documentation with the City of Santa Ana, Orange
<br />County, and other agencies. Records research is typ-
<br />ically performed by the project manager or under his
<br />direction. From this research, a plan of action is devel-
<br />oped for the preservation of existing monumentation
<br />and the setting of new points.
<br />Our first step in preserving the monumentation is to
<br />determine by field verification what monuments are
<br />still in place, which have been buried, and which have
<br />been destroyed. We then advise the City of our find-
<br />ings and plan an operation of setting tie points, which,
<br />based on our review of the construction documents,
<br />will be established outside proposed construction
<br />activities.
<br />Monumentation will be marked with either furnished
<br />(or as otherwise specified) disks, plugs, or tags, which
<br />shall be stamped with the project manager's California
<br />Professional Land Surveyor registration number, or as
<br />directed in each task. Monumentation shall be estab-
<br />lished or preserved for the project or project areas,
<br />and shall include considerations for utility locations,
<br />proper spacing, and durability. All monuments will be
<br />field referenced with a minimum of four (4) intersect-
<br />ing reference points, such as cut crosses on curbs,
<br />rebars outside the work area, or other approved refer-
<br />ence points.
<br />A pre -construction Corner Record will then be pre-
<br />pared and recorded with the County of San Bernardi-
<br />no for each monument. Corner Records shall include
<br />the character of the monument, its record reference,
<br />reference ties, and other pertinent data. All such field
<br />monumentation work will conform to Section 8771 of
<br />the California Business and Professions Code, which
<br />addresses the preservation of existing survey monu-
<br />ments.
<br />When construction has been completed, we return
<br />to the area and determine which monuments and/
<br />or tie points will need replacement. In many instanc-
<br />es, damage to the existing monuments is limited. In
<br />cases where monuments are to be replaced, a dura-
<br />ble monument, as described above, or standard well
<br />monument, if required by the City, is established and
<br />post -construction Corner Records are filed. All doc-
<br />rf TOWILL
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