Topographical & Geotechnical Surveys

Transcription

1 STANDARD TEXT GUIDELINE FOR Topographical & Geotechnical Surveys for ELEMENTARY AND SECONDARY SCHOOLS Prepared by the Design Department DATE ISSUED MARCH 2002 LATEST REVISIONS IN GREEN FONT REV 1 JAN 2003 REV 2 OCT 2003 REV 3 FEB 2006 REV 4 NOV 2008 REV 5 SEPT 2016 THE INFORMATION CONTAINED IN THIS DOCUMENT IS PROPRIETARY AND REMAINS THE PROPERTY OF THE DUFFERIN- PEEL CATHOLIC DISTRICT SCHOOL BOARD. THIS DOCUMENT MAY NOT BE USED IN ANY WAY, OTHER THAN AS AUTHORIZED BY THE DESIGN DEPARTMENT OF THE DUFFERIN-PEEL CATHOLIC DISTRICT SCHOOL BOARD. BY RECEIPT OF THIS DOCUMENT, THE RECIPIENT ACKNOWLEDGES AND AGREES TO THIS CONDITION.

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3 TOPOGRAPHICAL AND GEOTECHNICAL SURVEYS TABLE OF CONTENTS 1 SURVEY QUOTATIONS & CRITERIA INSTRUCTION TO ARCHITECTS CONDITIONS FOR AN OCCUPIED SITE SURVEY PROCEDURES ONTARIO LAND SURVEYOR DRAWING SCALE SUBMITTALS SURVEY PRIOR TO LAYING OF SOD GEOTECHNICAL SURVEYS INSTRUCTIONS TO ARCHITECTS CONDITIONS FOR AN OCCUPIED SITE CONDITIONS FOR AN OCCUPIED SITE GEOTECHNICAL INVESTIGATION FOR CONSTRUCTION DESCRIPTION SUBMITTALS SITE INVESTIGATION ADDITIONAL TEST HOLES BOREHOLES SHEAR WAVE VELOCITY TEST GEOTECHNICAL REPORT ARCHITECT S REVIEW TESTING FOR QUALITY OF SOIL CONTAMINATED SOIL REMOVAL PHASE I ENVIRONMENTAL ASSESSMENT PHASE II ENVIRONMENTAL ASSESSMENT PHASE II ENVIRONMENTAL ASSESSMENT REPORT ASSESSMENT OF EXISTING OIL TANK TO BE RETAINED PREPARATION OF SPECIFICATIONS FOR TANK REMOVAL ENVIRONMENTAL INVESTIGATION FOR PURPOSES OF SITE PURCHASE PROCEDURE i.)

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5 GUIDELINE TOPOGRAPHICAL AND GEOTECHNICAL SURVEYS 1 SURVEY QUOTATIONS & CRITERIA 1.1 INSTRUCTION TO ARCHITECTS The enclosed is not a specification. It is a Guideline of minimum requirements to be followed by the Architect in developing a "Submission of a Quotation for a Survey" for the Dufferin-Peel Catholic District School Board It is the Consultants' responsibility to insure that the Guidelines are appropriately amended to suit specific site conditions See Architects Guidelines, Item 2.12 (latest edition) regarding payment and submittal of invoices for both surveys and Geotechnical investigations. 1.2 CONDITIONS FOR AN OCCUPIED SITE When the Architects are requesting a survey for an existing, occupied site, the following mandatory clauses shall be included as part of the request: One week prior to the commencement of a survey on an existing site, the Surveyor shall phone the Principal of the school (Name of Principal and School phone number) identifying the firm and informing the Principal of the day and time the Surveyor s crew will be on site If the survey is postponed for any reason, the Principal shall be informed at least a day in advance and a new date established for the survey If the Principal has any objections to any of the proposed dates, the survey shall be rescheduled to a mutually agreed upon time with the Principal When a date has been established, and prior to calling the Principal, the Surveyor shall inform the Architect of the proposed date. The Architect shall, in turn, inform the Design Department The Design Department shall contact the Principal to confirm the established timelines and ascertain if the principal is satisfied with the arrangements. 1.3 SURVEY PROCEDURES The Architect shall require the Surveyor to perform the following minimum procedures: (The Architect may add to, or modify the list, depending on site conditions.) Provide legal description of the parcel, giving lot and plan number and PAGE 1 OF 14

6 GUIDELINE TOPOGRAPHICAL AND AND GEOTECHNICAL SURVEYS indicating total area in hectares and acres directly on the plan Identify boundaries of the site Identify adjacent land uses and zoning Identify and locate easements to, or on the site, and for what purpose Provide names of adjacent streets Provide indication of true north and date of actual site survey Provide levels over the entire site and adjacent streets and highways including ditches and crown of roadways Topography shall extend a minimum of 15 m beyond the property lines Topographical data shall be at 10m x 10m grid and contour lines at minimum 0.5m intervals Intermediate levels shall be taken where grade lines change rapidly Provide all street information, including grades at curbs (top and bottom), centre line of road & at sidewalks, hydrants on both sides of street Show adjacent bus bays, stops or shelters and mail box platforms Provide location and floor elevation of all residences on lots immediately adjacent to the school site. (BRAMPTON ONLY) Provide location, & floor elevation of all residences, and identify on plan all private driveways to residences across the street from all sides of school property abutting streets. (BRAMPTON ONLY) Elevations shall be related to a permanent bench mark. Geodetic level shall be used where possible Locate and identify bench mark and provide intermediate bench marks on existing tops of hydrants Provide location of catch basins and manholes and elevations of tops and inverts both on the site, and adjacent to property lines, and existing streets abutting the site Identify size of sewer lines from existing surveys wherever possible Locate electrical power lines, poles, light standards and location of transformers both pad and pole mounted Locate telephone and television cables, lines and poles Locate existing trees on site and adjacent to property lines. Trees with butt greater than 50mm shall be indicated as to type, height, spread and diameter of trunk & condition of tree Provide information regarding all existing structures on the school site, including driveways, walks, culverts, wells, septic tanks & septic beds Provide finished floor elevations of all existing structures. PAGE 2 OF 14

7 TOPOGRAPHICAL AND GEOTECHNICAL SURVEYS GUIDELINE Provide information regarding location materials and heights of fences Provide information on paved play and parking areas and locate & indicate lined markings on site Identify rubble, stockpiles and other site anomalies Provide information on style and type of pole mounted signs Provide information on building or zoning line setbacks and elevations of concrete floors of existing buildings. 1.4 ONTARIO LAND SURVEYOR Work shall be performed by a licensed Ontario Land Surveyor. 1.5 DRAWING SCALE Scale of survey will be (1:300) metric in CAD format Auto Cad Release (14). 1.6 SUBMITTALS Provide one disc and reproducible plot to the Architect and three hard copies, properly executed, signed, and sealed, to the Board. 1.7 SURVEY PRIOR TO LAYING OF SOD The Architect must note that a survey is required to be conducted by an OLS prior to laying of sod, to verify design grades Reserved. END OF SURVEY QUOTATION GUIDELINE PAGE 3 OF 14

8 GUIDELINE TOPOGRAPHICAL AND AND GEOTECHNICAL SURVEYS 2 GEOTECHNICAL SURVEYS 2.1 INSTRUCTIONS TO ARCHITECTS The enclosed is not a specification. It is a Guideline of minimum requirements to be followed by the Architect in developing a "Submission of a Quotation for Geotechnical information" for the Dufferin-Peel Catholic District School Board It is the Architect s responsibility to insure that the Guidelines are appropriately amended to suit specific site conditions See Information Guide for Architects (latest edition) regarding payment and submittal of invoices for both Surveys and Technical Investigations. 2.2 CONDITIONS FOR AN OCCUPIED SITE When the Architects are requesting Geotechnical Information from Geotechnical Consultants for an existing, occupied site, the following mandatory clauses shall be included as part of the request: One week prior to the commencement of Geotechnical information on an existing site, the Consultant shall phone the Principal of the school (Name of Principal and School phone number) identifying the firm and informing the Principal of the day and time the Consultant s crew will be on site If the investigation is delayed for any reason, the Principal shall be informed at least a day in advance and a new date established for the investigation If the Principal has any objections to any of the proposed dates, the investigation shall be rescheduled to a mutually agreed upon time with the Principal When a date has been established, and prior to calling the Principal, the Consultant shall inform the Architect of the proposed date. The Architect shall, in turn, inform the Design Department The Design Department shall contact the Principal to confirm the established timelines and ascertain if the principal is satisfied with the arrangements. 2.3 CONDITIONS FOR AN OCCUPIED SITE Prior to engaging a Geotechnical Consultant, the Architect must ascertain if the site is owned by the Board. PAGE 4 OF 14

9 TOPOGRAPHICAL AND GEOTECHNICAL SURVEYS GUIDELINE If it is, inform the Design Department of the date the investigation is to be performed If it is not, obtain from the Planning Department (through the Design Department) a letter of Permission to Enter from the developer or owner, prior to proceeding with the actual site investigation. 3 GEOTECHNICAL INVESTIGATION FOR CONSTRUCTION 3.1 DESCRIPTION The Architect will prepare a drawing indicating the existing/new building, the new addition the proposed paved play areas & parking lots and the locations of the proposed test holes. The drawing shall be referenced to the survey plan, if at all possible The Architect with their Structural Engineer should propose locations for the boreholes on the site plan, and indicate the depth required. The quantity should be reasonable for the scale of project The Architect will request that the Consultants carry out the investigation, prepare a Geotechnical report and make separate recommendations in a separate letter regarding investigation for soil contamination If the site is being newly developed and has not yet been pre-graded by the Developer, the geotechnical investigation is to occur after rough grading is complete. 3.2 SUBMITTALS The Consultant shall submit 5 hard copies to the Architect for distribution as follows: Board Architect Structural Engineer The Consultant shall submit an electronic copy to the Architect The Consultant must submit final report within two (2) weeks of authorization to proceed The original invoice, copies of reports and electronic copy shall be submitted directly to the Architect. PAGE 5 OF 14

10 GUIDELINE TOPOGRAPHICAL AND AND GEOTECHNICAL SURVEYS The Consultant shall submit a copy of the Certificate of Insurance issued by the Professional Liability Insurer of the Geotechnical Consultant. Minimum coverage required is $500, Insurance shall provide coverage for all advice provided including any advice provide on soil contamination. 3.3 SITE INVESTIGATION Existing Services: Determine location of any existing services and protect form damage Do not damage existing property, including trees. 3.4 ADDITIONAL TEST HOLES If preliminary field results indicate that additional test hole should be made, the Architect shall be contacted before the drilling equipment is removed form the site If the initial test hole does not confirm that the site is underlain by an adequate bearing stratum at a reasonable depth, the Architect shall be contacted before proceeding further. 3.5 BOREHOLES Extend borings to a minimum of 6-8 m for boreholes within proposed building footprint to bedrock unless bedrock encountered sooner. Provide the existence of bedrock by coring Extend borings to a minimum of 3-4 m for the remaining boreholes outside building footprint or to bedrock if encountered sooner Plug boreholes and backfill test pits. Remove surplus excavated material from the site Record geodetic ground elevation at each test hold Excavate sufficiently to expose and determine the elevation of the existing footing at each location. Measure the footing thickness and projection, then backfill the excavation (see plan for locations) Preserve soil and rock samples until it can be determined if further laboratory analysis will be required. PAGE 6 OF 14

11 TOPOGRAPHICAL AND GEOTECHNICAL SURVEYS GUIDELINE 3.6 SHEAR WAVE VELOCITY TEST If the site s seismic classification can be improved upon to avoid seismic restraint requirements for non-structural elements (i.e. mechanical and electrical equipment) by performing a Shear Wave Velocity Test, the Architect is to obtain a price from the Geotechnical Consultant (in their bid) for this test. The obtain approval from the Board to proceed with this test. 3.7 GEOTECHNICAL REPORT Prepare a Geotechnical report. Include recommendation and test result for the following: Recommend appropriate types of foundations The safe bearing capacity of the sub-strata at stated elevations and the anticipated uniform and differential settlements. Advise if weight of footing and soil above footing should be included when calculating footing bearing pressure in order to check against allowable bearing pressure Probable depth of rock surface to be removed to establish sound bearing, foundations bear on rock Advise on minimum depths at which foundations shall be founded. Minimum depth of soil required above bearing elevations, if this is a design requirement for bearing capacity. Advise on type and depth of frost protection for foundations If deep foundations are to be considered: the types and safe vertical and lateral load capacities for piles and/or caissons; and assessment of obstructions likely to be encountered during the installation of piles and/or caissons; and inspection and testing requirement during the installation Provide foundation factor for determination of earthquake forces Also provide the following: Unit density of soil and coefficients of active and passive earth pressures for design of member resisting lateral loads. Coefficient of friction for footing on soil Elevation of the water table, and, if weepers are required If addition, elevation of the underside of footing of adjacent existing structure at points noted on the Drawings Permanent perimeter and under-floor drainage requirement, including estimate of the amount of ground water to be pumped The stability of existing slopes on site and adjacent to site. PAGE 7 OF 14

12 GUIDELINE TOPOGRAPHICAL AND AND GEOTECHNICAL SURVEYS Suitability of the soil on site to support slabs-on-grade and paved areas. Coefficient of sub-grade reaction for design of slabs-on-grade and concrete pavements Suitability of the soil on site for use as compacted fill under slabs-on grade and paved areas, and method of compaction Suitability of the soil on site for use a backfill to exterior walls, and method of compaction Backfilling requirements including types of imported fill and levels of compaction Percolation rate of soil The ph and sulphate content of the ground water and the chloride content of the soil Recommendation for temporary shoring of excavation, including design requirements for both raker and tie-back systems Recommendation on asphalt pavement designs Recommendation on methods of de-watering during construction if a high water table is encountered Identification of any unusual problems likely to arise during excavation or during construction of foundations Prepare sketches of existing foundations showing footing elevation, thickness and projection at each location. 3.8 ARCHITECT S REVIEW At a later date, the Geotechnical Consultant will be provided with a copy of the foundation drawings and specifications Review of the information provided in order to confirm that the recommendations of the Geotechnical report have been correctly interpreted Submit written comments to the Architect for the Structural Engineers within two (2) weeks of receipt of information. 4 TESTING FOR QUALITY OF SOIL If topsoil is present when bore holes are taken, the quality of top soil from four (4) field borehole locations must be tested by an independent testing laboratory, and copies of the reports are to be submitted to the Architect. Based on the reports the Architect/Landscape Architect will determine required enhancement of the top soil to meet minimum Board top soil standards If topsoil is stockpiled on site for reuse, minimum of four (4) samples are required. PAGE 8 OF 14

13 TOPOGRAPHICAL AND GEOTECHNICAL SURVEYS GUIDELINE 4.13 Chemical testing must be done on recently filled or rough grades sites to indicate soil quality and requirements for any disposal during construction. 5 CONTAMINATED SOIL REMOVAL The Board is obliged to fill out an Environmental Site Screening Questionnaire and Declaration for most of its sites both new and additions in which the following questions must be addressed: Does the application propose development on septic systems or redevelopment on a site where septic systems were used? Has land filling occurred ion the site? Is there a reason to believe that the lands may be potentially contaminated based on historical land use? Is the nearest boundary line of the application within 500 m of an operational/non-operational landfill or dump? Have previous agricultural operations ever included sewage sludge application on the lands? Are there any underground storage tanks or other buried waste on the property? For existing or previous buildings on the site, are there building materials remaining which are potentially hazardous to health (e.g. Asbestos, PCB s)? If any of the above questions are answered in the affirmative, or answered as uncertain the Authorities Having Jurisdiction will require a Phase 1 Environmental Site Assessment to be prepared providing that such an assessment had not been done within the last five years To permit the Board to decide upon undertaking Phase 1 Environmental Assessment, make a separate and detailed recommendations to the Architect, quoting additional costs per task, for any additional investigation which should be undertaken with respect to the following: Site history An electromagnetic survey to determine location of underground storage tanks Analysis of the soil for noxious or explosive gasses Analysis of the soil for toxic substances The degree of contamination, if any, of existing soil which might be excavated and its possible effect on the cost of removal and disposal on site or off site. PAGE 9 OF 14

14 GUIDELINE TOPOGRAPHICAL AND AND GEOTECHNICAL SURVEYS 5.2 PHASE I ENVIRONMENTAL ASSESSMENT Separate Price # If requested to perform a Phase 1 Environmental Site Assessment (ESA) for the site, the Consultant shall prepare a Phase 1 Environmental Assessment Report that follows CSA standards Z (latest addition) This report must address the questions posed by the Municipality This report must include a clause which allows the Authorities Having Jurisdiction to make reliance on the finding and conclusions presented in the report, and must be sealed, signed, dated by a Professional Engineer The report must include a clear statement by the Engineer regarding the suitability of the site, including and lands to be conveyed to the Region of Peel and the Credit Valley Conservation Authorities, for the intended land use If the Board believes that there is an existing buried underground oil storage tank(s) on the site, these are to be confirmed and located as part of the phase 1 Report. 5.3 PHASE II ENVIRONMENTAL ASSESSMENT Geophysical survey portion only Separate Price # As part of the Phase II environmental assessment a Geophysical Investigation must be conducted in advance of the remediation work to determine the presence of any existing Underground Storage Tanks (UST). 5.4 PHASE II ENVIRONMENTAL ASSESSMENT REPORT Separate Price # Once the Geophysical Survey is completed and the location(s) of UST s are determined, perform (4) four boreholes per tank centered on each side of the tank approximately 1m from each side This Phase II should address, but not necessarily be limited to, the following: Confirmation that soils, including fill, and ground water on site are in conformance with the appropriate MOE criteria and, Any existing UST s in use comply with current Guidelines and Regulations. (See item 3.5 below) The Phase II ESA must be sealed and signed by the professional Engineer and include a clear statement by the consultant regarding the suitability of the site, including any lands to be conveyed to the Municipality, the Region of Peel and PAGE 10 OF 14

15 TOPOGRAPHICAL AND GEOTECHNICAL SURVEYS GUIDELINE Credit Valley Conservation, for the intended land use. The report must include a clause which allow the Municipality to make reliance on its findings Should the consultant identify that remediation is required to meet the appropriate MOE criteria, prior to any approval; any and all contaminated areas of the site identify in the report must be reedited in conformance with MOE Guidelines Upon completion of the remediation, the proponent will submit a complete Record of Site Condition (RSC; latest revision). The RSC shall include and Affidavit of Compliance from the consultant and a statement from the property owner an include acknowledgment of receipt of the RSC by the MOE. 5.5 ASSESSMENT OF EXISTING OIL TANK TO BE RETAINED Separate Price # Additions, particularly in secondary schools, may have buried waste oil storage tanks that are part of the auto shop program and that are to be retained The Municipality may require a certification from the Environmental Consultant that the existing tank is not leaking The Environmental Consultants must take measurements, including, but not necessarily limited to, pressurizing the tank to ascertain pressure worthiness If the tank is leaking, then the Consultant shall prepare procedures to remove it, as outlined below. If the tank meets pressure worthiness, the Consultant shall prepare a report to that effect This report must include a clause which allows the Authorities Having Jurisdiction to make reliance on the finding and conclusions presented in the report, and must be sealed, signed, dated by a Professional Engineer. 5.6 PREPARATION OF SPECIFICATIONS FOR TANK REMOVAL The Consultant shall prepare specifications to remove the tank(s) and any surrounding contaminated soils. The specification will be in three parts: Part 1- Removal of Tank Separate Price The contractor shall provide all required labour, machinery and materials to remove (one or more) existing underground fuel oil storage tank(s) (UST) from the site (approximate tank volume is XXXX imperial gallons) containing (fill material or approximately XXXX litres of fuel) Work to be included, but not necessarily limited to, the following: The careful excavation and exposure of the existing buried tank. PAGE 11 OF 14

16 GUIDELINE TOPOGRAPHICAL AND AND GEOTECHNICAL SURVEYS Disconnection and removal of all piping from source to the tank Removal of the tank and contents from site Disposal of tank and contents in an approved manner, at an approved location (contaminated materials) Backfilling the resulting hole with imported Granular B material, fully compacted to 100% SPMDD in 300 mm lifts to original grade level Part 2 Removal of Contaminated Soils Separate Price The contractor shall provide all required labour, machinery and materials to excavate, remove and dispose of existing petroleum contaminated soils around the tank as necessary, and as directed by the Consultant Work to be included, will be as follows: The careful excavation of (presumed) contaminated soil to an overall hole volume of 27 cubic metres (3 m wide x 3 m long x 3 m deep) The removal of excavated soil from site and disposal of same in an approved manner, at an approved location (contaminated materials) Backfilling the resulting hole with imported Granular B material, fully compacted to 100% SPMDD in 300 mm lifts to original grade level Part 3 Removal of Contaminated Soils beyond Part Cost of excavation and removal from site to an approved location of contaminated material beyond the Removal of Contaminated Soils of Part 2 shall be identified in the Unit prices of the Supplementary Form of Tender. (Architect to include in the Unit Prices Section, identifying the appropriate landfill site.) 6 ENVIRONMENTAL INVESTIGATION FOR PURPOSES OF SITE PURCHASE Environmental site investigations are performed to check for contaminants as a standard procedure prior to the approval of any new sites. 6.1 PROCEDURE Depending on past land use, one of four levels of environmental testing may be established The history of land use for a site may be established from information gathered in a number of ways, including the search of title of the property, investigation of the PAGE 12 OF 14

17 TOPOGRAPHICAL AND GEOTECHNICAL SURVEYS GUIDELINE activities of previous owners, and data available from the Ministry of Environment and other Government Ministries and Agencies The Ministry of Environment maintains a registry of dumpsites, which may be useful in identifying some areas of concern. If past land use cannot be reliably established, the most comprehensive level of testing would be carried out. While this procedure does not address every conceivable condition, it does provide a normal element of safety for the students and staff of new schools Based on this site history investigated by the Consultant, one of four levels of environmental analysis would be undertaken. The environmental analysis would proceed as follows: Level 1 Analysis Level 1 testing would be on farm land which is not in close proximity to any manufacturing plants or other industries which may have caused leaching, and which, by title search, has shown to be always used as farmland. (The majority of the sites to be purchased by the Board are in this category.) Level 1 of soil would consist of testing two samples by means of hand auguring and testing for the following; Whole sample analysis of soils to test for toxic levels of; the metals arsenic, cadmium, chromium, cobalt, copper, iron, lead, mercury, molybdenum, nickel, selenium, zinc, antimony, vanadium; chlorinated pesticides and PCB s; and organic content analysis Level 2 Analysis Level 2 testing would be on farm land which, by title search, was shown to be always used as farm land, but is, or has been, in close proximity to a manufacturing plant or other industry, that may have caused spread of contaminates Level 2 testing would consist of testing two representative soil samples for the following: As under Level 1 and in addition potential other chemicals as might be used by the industry, that is, or was, in close proximity to the site Level 3 Analysis Level 3 testing would be on property occupied by a manufacturing plant or other such industrial complex, but where the site history indicated that it was not used in the manufacture, or disposal of, chemicals or other possible toxic materials Level 3 would consist of testing at least two soil samples as shown for Level 2 testing and allow for discretionary tests depending on type of PAGE 13 OF 14

18 GUIDELINE TOPOGRAPHICAL AND AND GEOTECHNICAL SURVEYS plant. In case of contaminants, an Ontario Regulation 309 Leach would be used to assess if the soil was hazardous waste Level 4 Analysis Level 4 testing would be on a property previously or presently occupied by a manufacturing plant whose manufacture was of a chemical or toxic nature, or the site was know to be used for storage of chemicals or there is a possibility that toxic products were dumped or disposed of on the site Level 4 testing would consist of testing five soil samples for the parameters Level 3. Greater allowance for discretionary test, depending on type of plant is likely needed. Ontario Regulation 309 leaching test would be competed on at two samples to verify they were not hazardous wastes Testing report results will be submitted to the Board s Design Department staff. END OF GEOTECHNICAL SURVEY GUIDELINE FGL/E:\Data\Word\INSTRUCTIONS\DPCDSB TOPO & GEO SURVEYS.doc PAGE 14 OF 14