Res 1999-138 - Laserfiche WebLink

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Attachment A Continued Baker-Aielden & Associates, Inc. June 3, 1999 PSI Proposal No. 301-9084 Page Two of Seven · Recommend foundation types/parameters for the construction of culverts. · Preparation of a report which discusses the soil and groundwater conditions encountered and presents pavement recommendations per the City of San Marcos/City of Austin Standards. It is proposed. to explore the subsurface materials and groundwater conditions at the site by drilling test borings using truck mounted. drilling equipment. Based on PSI's reconnaissance of Holland Street, it is anticipated that ten (10) borings drilled to an average depth of eight (8) feet would provide adequate geotechnical information for the determination of the pavement recommendations. If competent limestone is encountered, the borings may be terminated at shallower depths. The borings will be located. in the field by an engineer in selected areas, and will likely not occur at regular intervals. In order to determine the possible causes of the existing pavement failure, it is requested. that the Baker-Aicklen provide PSI with the following information: traffic count data including the frequency, volume, and type of traffic and bow long the existing pavement has been in place. PSI will then perform a field reconnaissance which will consist of sketching typical areas of pavement failure. The above information will then be analyzed along with the samples of the existing asphalt, base material, and subgrade, and the possible causes of pavement failure will be determined. These possible causes of pavement distress will be discussed in the geotechnical report. Based on our conversations with Ms. Laurie Anderson, P.E., and Mr. David Prado, both with the City of San Marcos Department of Envir,onment and Engineering, it is understood that the City will clear the utilities prior to the start of drilling operations. It is also understood that the City will provide traffic control while the drilling operations are performed. The subsurface exploration will include laboratory testing of the samples obtained to evaluate the classification, strength, plasticity, and other characteristics of the subsurface materials involved. The results of the field exploration and laboratory tests will be presented in a written report prepared by a professional engineer. PSI is familiar with local subsurface conditions and has participated in the planning, development, and execution of pavement evaluations in the project area. PSI laboratories are equipped with modem soil and rock testing apparatus, and field exploration programs are conducted with modem drilling equipment. Field and laboratory testing is performed by trained, qualified technicians under the guidance and supervision of professional engineers. l"'~;l I!!.fiiJI. .