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Chaucer-CS 970721 July 21, 1997 10555 l!ewkifk Street S .'.~ i t e 5 3 0 972.831. FAX 972 The City o~ Coppdl 255 ~~ Blvd. ~. O. Box 478 Coppel], Texas ?50 Attn: Kenneth M. Griffin, P.E. Assistant City Manager City Engineer Re: PROPOSAL FOR GEOTECHNICAL CONSULTING SERVICES Pond Siltation Study Chaucer Estates Heartz Road and Park Valley Drive Coppell, Texas PBT Proposal No. 97-282 Dear Ken: Patton, Burke & Thompson (PBT) is pleased to submit this written proposal, in accordance with our July 15, 1997 conversation with you, for performing certain geotechnical consulting services for the referenced pond. This study will be in addition to the work previously performed in late-1995. GENERAL It is our understanding, based on the work reported for this site on November 2 and 30, 1995, that the subject pond is privately owned by the Chaucer Estates homeowner's, is approximately 1 to 1-1/2 acres in plan, was constructed in the last 5 or 6-years with a normal pool elevation of 460.0-feet and reportedly had an original bottom elevation of450.0-feet. Apparently the pond has shown signs of continuing siltation, according to the Homeowners. The primary purpose of this assignment is to provide geotechnical subsurface information to assist the City in quantifying the extent and nature of the current siltation. SCOPE OF WORK Our proposed scope of work, again based upon discussion with you, our previous experience with this pond and similar assignments, would involve a geotechnical engineering investigation program. The following describes the general scope of work we propose at this time for carrying out the necessary, in our opinion, services: Patton, Burke & Thompson Ci~, of Coppell Page 2 1. Field investigation · Four (4) shallow sampling probes taken in the pond area which penetrate the bottom silt layer and a foot or so into the original pond bottom. These probes, estimated to penetrate 5 to 6-feet of total soil sediments, will be taken from a 12 to 14-foot work boat and samples obtained by either pushing or driving a soil sampler. 2. Laboratory Testing · Moisture content, unit weight (if possible), and grain-size analysis on selected siltation soils to determine classification and consistency properties. · Other laboratory tests as deemed appropriate upon evaluating findings of probes. 3. Engineering Analyses/Written Report · Pond bottom soil stratigraphy and associated variability, at sampled locations. · Evaluation of physical and consistency characteristics of bottom soils. · Discussion of findings and conclusions in regard to thickness and geotechnical properties of siltation. 4. Assumptions Regarding Site and Field Work · The probes will be located in the field by PBT based upon rough measurements from existing features. · Selected probe locations are flee of underground obstructions, and underground utilities, if any, will be located by others. · Field standby time (outside PBT's control) will not exceed 1-hour. · The assignment assumes that only non-contaminated/non-hazardous soils and subsurface conditions will be encountered during the field exploration program. Otherwise, the proposed cost for the field and laboratory investigations will need to be revised. PRICING/CONTRACTING PBT proposes to perform the work for this investigation on a time and materials basis, for the scope of work outlined above, for a maximum not to exceed budget of/$2,350.] Furthermore, we propose to provide all services in accordance with PBT's General Terms & Conditions (Form 1-97A), and any additions or modifications to the above referenced scope of work, with prior approval by you, will be in accordance with PBT's Schedule of Charges (Form 9-97/B) Patton, Burke ~, Thompson Engineering Consultants City of Coppell Page 3 SCHEDULING OF WORK PBT will develop a schedule for the field investigation program immediately upon your authorization. The field program, barring any access problems or severe weather, can normally be completed in less than one (1) working day at~er mobilization to the site and the laboratory testing program, for selected soil sediment samples - retained from the probes, will be completed within two (2) or four (4) working days after field program completion. Following the collection of all field investigation and laboratory testing data, preliminary verbal findings can be presented, if desired, within one (1) to two (2) working days. The final written report will be submitted within five (5) working days after the preliminary verbal findings. PBT is pleased to have the opportunity to submit this geotechnical investigation services proposal to you and we look forward to being of professional service. If you have any question in regard to the content of this proposal, or if additional input is desired, please feel free to contact the undersigned. To authorize this work, please sign and return one copy of this agreement to us. Very truly yours, ~k W. Burke, P.E. "'Principal Enc: Assignment Authorization General Terms and Conditions Schedule of Charges SD/JWB/jp 97-282.pro Patton, Burke & Thompson Engineering Consultants City of Coppell Page 4 ASSIGNMENT AUTHORIZATION The City of Coppell hereby agrees to the terms of this proposal and the attached General Terms and Conditions (Form 1-95/A), and the attached Schedule of Charges (Form 4-96/B and 05/96/L). Proposal accepted by: The City qf Coppell* N Company Title Date *Individual with financial authority to commit to this Assignment Authorization. Pa**on, Burke & Thompson Engineering Consultants Patton, Burke & Thompson General Terms and Conditions 1.0 General Patton, Burke & Thompson (PBT) by the performance of services covered hereunder, does not in any way assume any of those duties or responsibilities g~th regard to the project's design professionals or an), other design agencies or authorities. Client agrees to furnish or cause to be furnished to PBT, all documents and information k~og~ to client that relate to the identity..-, location, quantity, nature or characteristics of any hazardous or toxic materials on or near the site. In the event that test samples obtained during PBT's work contain substances hazardous to health, safety, or the environment, these samples remain in the property of the client. 2.0 Billing PBT grill submit progress invoices to client monthly and a final invoice upon completion of services. Each invoice, on presentation, is due and payable by client or his authorized representative. Pa)xneat is past due 30 days fi.om invoice date. Client agrees to pay interest of one and one-half percent (1-1/2%) per month, (but not exceeding the maximum rate allowable by lag'), on past due accounts. Any attorney's fees or other costs incurred in collecting any delinquent amount shall be paid by client. 3.0 Standard of Care PBT ser~dces will be perfomaed, v,~thin the limits prescribed by its clients, v,4th the usual thoroughness and competence of the engineering consulting profession, and in accordance with the standard for professional services at the time and under similar conditions those services are rendered. No other warranty or representation, either expressed or implied, is included or intended in PBT's proposals, contracts, or reports. 4.0 Liability PBT's liability shall be limited to injury or loss caused by the negligence of PBT, its subcontractors, and/or agents hereunder. PBT has neither created nor contributed to the creation or existence of any hazardous, toxic, pollutant, or otherwise dangerous substance or condition at the site, and its compensation hereunder is in no way commensurate with the potential risk of injury or loss that may be caused by exposure to such substances or conditions. PBT's liability for injury or loss arising bom (1) professional e~rors or omissions and/or (2) any hazardous, toxic, pollutant, or waste gases, liquids, or solid materials shall not exceed $5,000 or our fee, whichever is greater. PBT's liability for injury or loss arising from comprehensive general and automobile exposures shall not exceed $100,000. The client agrees to defend, indemnify, and hold PBT harmless fi'om any claim, liability, or defense cost in excess of the limits stated herein for injury or loss sustained by any party fi.om exposures allegedly caused by PBT's performance of services hereunder. In the event the client makes a claim against PBT, at law or otherwise, for any alleged error, omission or other act arising out ofthe performance of its professional serv4ces, and to the extent the client fails to prove such claim, then the client shall pay all costs, including attorney's fees, incurred by PBT in defending itself against the claim. 5.0 Applicable Law All general terms and conditions shall be governed by the laws of the State of Texas. Form(l-9 5lA) PATTON, BURKE & THOMPSON SCHEDULE OF CHARGES The compensation to Patton, Burke & Thompson (PBT) for professional services is based upon and measured by the following charge elements. 1.0 Personnel Charges Charges for PBT employees and consultants are based upon hourly rates for the following general labor categories: Engineering Technician I ..................................... $29/hr Engineering Technician II ..................................... $31/hr Engineering Technician III .................................... $33/hr Senior Engineering Technician ................................. $35/hr CWI/Structural Steel Inspector ................................ $40/hr Word Processor/Secreta-D' . ................................... $30/hr Drafting ................................................... $35/hr Staff Engineer .............................................. $45/hr Geologist .................................................. $55/hr Project Engineer ............................................ $55/hr Senior Engineer ............................................ $85/hr Principal ................................................. $105/hr Expert Witness (Deposition & Trial) ........................... $125/hr [Note: Time spent in either local or inter-city travel, when travel is in the interest of the work, will be charged for in accordance with the foregoing schedule; however, for non-local travel by public carrier a maximum of eight hours per day will be charged.] 2.0 Equipment Charges PBT equipment, if used, will be billed at the rates noted in the proposal. 3.0 Other Services and Supply Charges Charges for services, equipment and facilities not furnished directly by PBT, and any unusual items of expense not customarily incurred in PBT's normal operations, are computed as follows: · Cost plus 15 percent includes surveying services, land drilling equipment, construction equipment, testing laboratories, shipping charges, subsistence, transportation, outside printing and reproduction, long distance communication, special supplies and rentals. · Cost plus 20 percent includes aircraft:, watercraft, and marine drilling equipment. FOILM (04-96fB) ATTON, BURKE & THOMPSON SCIIEDULE OF LABORATORY TESTING CHARGES Visual Unified Classification, sample ............................ $ N/C Natural Moisture Content ........................................ 5.00/ca Unit Weight ................................................. 10.00/ca Specific Gravity .............................................. 40.00/ca Atterberg Limits Wet Method) .................................. 35.00/ca Grain Size Analysis,//200 sieve only ............................. 20.00/¢a Grain Size Analysis, l-inch to t/200 sieve .......................... 35.00/ca Hydrometer Analysis .......................................... 70.00/ca Lime Series (LL & PL) ........................................ 155.00/ca Unconfined Compression, peak stress only ......................... 35.00/ca Unconfined Compression, with stress/strain curve ................... 55.00lea Triaxial Shear (UU), per point, peak stress only ..................... 85.00/ca Triaxial Shear (UU), per point, w/stress-strain ..................... ll0.00/ea Triaxial Shear (CU), per point, w/stress-strain ..................... 250.00/ca Triaxial Shear (CU w/pore pressure), per point, w/stress-strain ........ 305.00/ca Direct Shear (UU), per point, w/stress-strain ...................... 120.00/ea Direct Shear (CU), per point, w/stress-strain ....................... 140.00/ca Direct Shear (CD), per point, w/stress-strain ....................... 160.00/ca Soil Suction (filter paper) ...................................... 20.00lea One-Dimensional Swell ........................................ 35.00lea One-Dimensional Swell with Load Back ........................... 55.00/ca One Dimensional Swell with Load Back &Rebound .................. 75.00/ca Consolidation - w/o Time Plots ................................. 190.00/ca Consolidation - with Time Plots ................................. 250.00lea Failing or Constant Head Permeability ........................... 175.00/ca Flexible Membrane Permeability ................................ 300.00/ca Standard Compaction ........................................ 115.00lea Modified Compaction ................................. , ......135.00lea CBR (3-points, includes proctor) ................................ 325.00/ea pH ..................................................... 20.00lea Water Soluble Sulfates ......................................... 30.00/ca Resistivity (natural moisture and saturated) ........................ 40.00lea Concrete Mix design review .................................... 100.00Ica Cylinder Compressive Strength .................................. I 1.00/ca Compressive Strength of Concrete Cores .......................... 20.00lea Compressive Strength & Density of Concrete Cores .................. 29.00lea Splitting Tensile & Density of Concrete Cores ...................... 29.00/ca Flexural Strength of Cast Beams ................................. 15.00/ca Concrete or Asphalt Coring ..................................... 85.00/hr Asphalt Mix Design Review . .................................. 200.00/ca Hveem stability & density (w/Theoretical Maximum Density) ......... 200.00/ca Extraction and gradation ...................................... 140.00/ca Form (05/96/L)