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HomeMy WebLinkAbout6084RESOLUTION NO. 6084 A RESOLUTION APPROVING AN AGREEMENT BETWEEN THE CITY OF PUEBLO AND GREYSTONE DEVELOPMENT CONSULTANTS, INC., FOR PROFESSIONAL SERVICES ASSOCIATED WITH THE SUBSURFACE ENVIRONMENTAL INVESTIGATION FOR THE MCDONNELL DOUGLAS SITE BE IT RESOLVED BY THE CITY COUNCIL OF PUEBLO, COLORADO, that: SECTION 1. An agreement between the City of Pueblo, and Greystone Development Consultants, Inc., a copy of which is on file with the City Clerk and incorporated herein by reference, whereby Greystone Development Con- sultants, Inc., shall provide and perform professional services associated with a subsurface Environmental Assessment Investigation for McDonnell Douglas Astronautic Facility - Pueblo, for compensation not to exceed $19,900, with such terms as the City Manager may require, and upon approval as to form by the City Attorney, be and is hereby authorized and approved. SECTION 2. Funds for said professional services shall be paid from Account No. 034 -1987 -100- 000 - 040 -8705 SECTION 3. The City Manager is hereby authorized to execute said Agreement on behalf of the City of Pueblo, a Municipal Corporation, and the City Clerk shall affix the Seal of the City thereto and attest the same. INTRODUCED August 24 , 1987 By SAMUEL CORSENTINO Councilman APPROVED: . - ;i , � 4�;6� President of the Council ATTEST: ity Clerk -2- AGREEMENT FOR PROFESSIONAL SERVICES THIS AGREEMENT, entered into as of this day of 1987, by and between the City of Pueblo, State of Colorado (hereinafter referred to as the "City "), and Greystone Development Consultants, Inc., a corporation organized and existing under the laws of the State of Colorado, doing business as Greystone Development Consultants, Inc., of the County of Arapahoe, State of Colorado, (hereinafter referred to as the "Contractor" ), WITNESSETH: WHEREAS, the City is undertaking certain activities neces- sary for the planning or execution of a project; and WHEREAS, the City desires to engage the Contractor to render certain professional advice and assistance in connection with such undertakings of the City: NOW, THEREFORE, the parties hereto mutually agree as follows: 1. Scope of Services The Contractor shall perform the necessary services provided under this Agreement in connection with and respecting the following project: A subsurface environmental assessment investigation at the McDonnell Douglas Astronautics Facility in Pueblo. and shall do, perform, and carry out, in a satisfac- tory, proper, and complete manner, as determined mutually by the City and the Contractor, the following: A. Identify chemical contaminants. B. Characterize subsurface geology and hydrology. C. Assess the physical /chemical properties of the soil - chemical complex. D. Evaluate the contaminants' potential for incurring adverse effects to human health and the environment. This work will be completed using the methods described in the attached proposal. 1. 2. Data and Information to be supplied by the City The City shall furnish the appropriate data and information to the Contractor. This may include: - Aerial maps, City maps, zoning maps; - City Code book; - Available hydrology /geology data; - Historical use information; - Other data. 3. Time of Performance The services of the Contractor are to commence on receipt of Notice to Proceed, and shall be undertaken and completed in such sequence as to assure their expeditious completion but in any event all of the services required hereunder shall be completed on or before 90-days after Notice to Proceed. 4. Method of Payment The City shall pay to the Contractor the amount of $19,900, which shall constitute full and complete compensation for the Contractor's services hereunder. Such sum will be paid in the following manner, in every case subject to receipt of a requisition for payment from the Contractor stating that he has performed the work and that he is entitled to receive the amount requisitioned under the terms of the Agreement: Monthly progress payments. It is expressly understood and agreed that in no event will the total compensation and reimbursement to be paid hereunder exceed the maximum sum of $19,990 for all of the services rendered. Only changes in the Scope of Work shall justify a change in budget. 2. 5. General Terms and Conditions A. Termination of Agreement for Cause If, through any cause, the Contractor shall fail to fulfill in timely and proper manner his obligations under this Agreement, or if the Contractor shall violate any of the covenants, provisions, or stipula- tions of the Agreement, the City shall thereupon have the right to terminate this Agreement by given written notice to the Contractor of such termination and specifying the effective date thereof, which notice shall be given at least ten days before the effective date of such termination. In such event, all finished or unfinished documents, data, studies and reports prepared by the Contractor under this Agreement shall, at the option of the City, become its property and Contractor shall be entitled to receive just and equitable compensation for any satisfactory work completed with respect to such documents. Notwith- standing the above, the Contractor shall not be relieved of liability to the City for damages sustained by the City by virtue of any breach of the Agreement by the Contractor for the purpose of setoff until such time as the exact amount of damages due the City from the Contractor are determined. B. Changes The City may, from time to time, request changes in the scope of the services of the Contractor to be performed hereunder. Such changes, including any increase or decrease in the amount of the Contractor's compensa- tion, which are mutually agreed upon between the City and the Contractor, shall be in writing and upon execution shall become part of this Agreement. C. Assignability Any assignment or attempted assignment of this Agree- ment by the Contractor without the prior written consent of the City shall be void, provided, however, that claims for money due or to become due the Contrac- tor from the City under this Agreement may be assigned to a bank, trust company, or other financial institu- tion, or to a trustee in bankruptcy, without such approval. Notice of any such assignment or transfer shall be furnished by the City. 3. D. Audit The City or any of its duly authorized representative shall have access to any books, document, papers, and records of the Contractor which are pertinent to the Contractor's performance under this Agreement, for the purpose of making an audit, examination, or excerpts. E. Equal Employment Opportunity In performing this Agreement, the Contractor shall not discriminate against any employee or applicant for employment because of race, color, religion, sex, or national origin. F. Ownership of Documents Drawings, specifications, guidelines and other docu- ments prepared by the Contractor in connection with this Agreement shall be the property of the City. G. Governing Law This Agreement has been executed by the parties hereto on the day and year first above written and shall be governed by the laws of the State of Colorado. The Contractor shall also comply with all applicable statutes, ordinances, and codes of the City and shall commit no trespass on any public or private property in the performance of any of the work embraced by this Agreement. 6. Extent of Agreement This Agreement represents the entire and integrated agreement between the City and the Contractor and supersedes all prior negotiations, representations or agreements, either written or oral. This Agreement may be amended only by written instrument signed by both the City and the Contractor. 4. IN WITNESS WHEREOF, the City and the Contractor have executed this Agreement as of the date first above written. ATTEST: Cit rk APPROVED AS TO FORM: City Atto n ATTEST: Title: OF • ' C gZ �/ GREYSTONE DEVELOPMENT CONSULTANTS iZ "C64 Title: Q ` u 1 N "PCJ-Q M ATTACHMENT A SCOPE OF WORK 2.0 SCOPE OF WORK The site of concern is a 21.7 acre parcel which is in the Pueblo Airport Industrial Park located approximately five miles east of the city limits on the Highway 50 Bypass. In the early 1940's, the site was part of an army base. The base was decom- missioned in 1943 and acquired by the City of Pueblo in 1947. In 1953, the existing airport was constructed. Over the past 25 years, various lands not required for airport operations have been sold or leased to industries such as McDonnell Douglas. Existing activities which may be of concern to this study include a landfill site located one -half mile east, underground fuel storage tanks at Glenn Trucking to the immediate west, casting operations conducted by Dana Corporation to the immediate north, and other general activities such as airport, railroad, highway and industrial operations. Unknown historic uses of the site and surrounding area, chemicals and raw materials previously used, and wastes generated and disposed of necessitate geologic and hydrologic investigations of the site to determine existing conditions. As such, the objectives of the proposed studies are to: 1. Identify any chemical contaminates in the subsurface material of the site. 2. Assess the physical /chemical properties of the soil - chemical complex. 3. Characterize the subsurface geology and hydrology of the site. 4. Evaluate any identified contaminate's potential for incurring adverse effects to human health and the environment. 2.1 Existing Environmental Conditions The site lies in an area which slopes gently to the southeast to the Arkansas River which is approximately one mile away. In September, 1986, a geotechnical study for the existing McDonnell Douglas building was conducted. A total of 11 test holes were drilled to bedrock and subsurface conditions were described. Eight holes were located within the building site, while three holes were located in the parking area. Depth of the holes ranged from 9 to 39 feet with bedrock ranging from 21 to 39 feet from the surface. From these test holes, it was determined that the bedrock dips to the southeast. During drilling, moisture was encountered at 11 and 15 feet with free water at the bottom of each hole. Holes TH -5 (northwest corner) and TH -4 (southeast corner) were left open for three days to allow static water level conditions to establish. Following this period, water levels were measured at 7 and 12 feet, respectively, below the existing grade. For the preparation of this proposal, a site reconnais- sance was conducted on May 5, 1987. No unusual observations were made relative to contaminants or hazardous materials. However, it was observed that the site's vegetation has been removed and piled along the eastern boundary of the site. Contacts were also made with Ms. Linda Wagner with the Corp of Engineers to receive information concerning their current study of the historic army base, Mr. Roy Monroe with the Airport Authority to receive information on past studies and airport operations, Mr. Dwayne Jordon with McDonnell Douglas to further define the objectives of the study, Mr. Tom Cvar with the City of Pueblo to receive existing information and further define the study, and Ecology and Environment to receive results of a geophysical study conducted near the Sperry Building site. Additional contacts will be made to these and other sources to receive detailed information for the site area. To further define environmental conditions and to accomp- lish the objectives identified above, sampling activities will be conducted on the site. These activities will include: 1. Installation of at least six on -site ground water monitoring wells. 2. Soil samples will be collected at the six monitoring wells locations and analyzed for oil and grease (top five feet) and the EPA priority pollutant list includ- ing metals, pesticides and screening for PCB. 3. Water samples will be collected at the six monitoring well locations and analyzed for the same parameters as soil sampling. 4. Analysis of all data and preparation of a description of the existing geologic and hydrologic conditions. The following sections present a detailed description of the activities to be conducted during this study. 2.2 Sampling Program The monitoring well drilling and installation program is based on boreholes and a limited research of existing hydrogeo- logical information provided from the existing building founda- tion study. Our program is based on the following: o Test boreholes for the existing building indicated that the subsurface material ranges from a soft to a very stiff clay i.e. claystone. This is very typical of the area. The depths of this material (claystone bedrock, Pierre Shale) ranged from 21 to 39 feet dipping to the south. o The Pierre Shale formation consists of claystone and shale layers with occasional sandstone beds. The unconfined groundwater surface in the Pierre Shale generally coincides with the top of the grey, unweath- ered bedrock zone. o The average horizontal hydraulic conductivity of the layered Pierre Shale Formation is probably in the range of 10 -3 to 10 -5 cm /s, with flow concentrated in the thin, more permeable sandstone beds. Low effective porosities may result in relatively fast seepage velocities. The vertical hydraulic conductivity is expected to be low, due to the claystone and shale deposits and is likely controlled by fissures in the weathered zones. o The alluvial water table appeared to be at approximat- ely 7 to possibly 15 feet below the existing grade. The hydraulic conductivity of the saturated alluvium probably varies between 10 -2 to 10 -4 cm /s. Drilling Procedures The method selected for borehole advancement is based on the subsurface geologic /hydrogeologic characteristics, the depths of the wells and previous experience drilling in this area. A 6 1/4 inch inside diameter hollow steam auger drilling technique appears to be the most efficient method for borehole advancement in this area. This technique facilitates downhole sampling and well installation. To provide a characterization of the subsurface geology, the use of the hollow stem is further justified in that continu- ous coring can be accomplished. The borehole will be advanced with a core barrel down the middle of the auger. This continuous coring of the borehole will allow the onsite geologist/ engineer to more accurately gain stratigraphic control and to identify significant formations and stratigraphic contacts. Continuous coring on all the holes is not proposed since previous soils sampling indicated undisturbed conditions on the site. It is recommended that at least 2 boreholes are continuously cored. The holes to be cored should include at least one upgradient and one downgradient to identify the bedrock dip. Also, by continuously coring it is much easier to visually identify zones of contamina- tion /staining which enhances the soil sampling. Should any forms of subsurface contamination be indicated by the cores, additional coring may be recommended for the other holes. The holes will be drilled to the contact zone of the unweathered and weathered bedrock. The onsite geologist /engineer will keep detailed drilling logs and field records. The geolo- gist /engineer will also monitor for any evidence of contamination in the subsurface using a HNu Systems, Inc. Model PI -101 Photoionizer, equipped with a 1 -.2 electron volt (e.v.) lamp to determine the levels of volatile hydrocarbons present in the soil atmosphere. This is a total hydrocarbon measuring device (excluding methane) and is an excellent field screening tool which helps to optimize the soil sampling locations and it also can be used to determine vertical extent of contamination. The holes will be drilled to an average depth of 30 feet (based on previous boreholes). Soil samples will be collected within the first five feet of each hole. To minimize costs, a sample will be composited from this first five feet into one sample. Only one sample should be required in this interval since if anything was buried in this area there should be evidence of it within the first five feet and also this area is not a suspect area for any hazardous waste (according to conver- sations mentioned above). However, if there are any zones of obvious visual contamination or if the HNu indicates that an unusual amount of total hydrocarbons (i.e. elevated above background) are present, then more than one sample may be collected. Other soil samples to be collected during drilling will be based on visual observations and HNu readings. For all boreholes, additional soil samples will be collected throughout the core, however, they will not be analyzed until a later date if contaminents are identified in the first set of samples. Well Construction Procedures All wells will be constructed in accordance with the U.S. EPA guidelines for monitoring wells. The wells will be completed inside the hollow stem auger. As stated above, the holes will be advanced to the weathered /unweathered contact zone. If this depth is greater than 5 feet below the water table then the hole will be backfil- led with sand to 5 feet below the water table. Mill slot schedule 40 PVC screen will be placed downhole with 5 feet of screen below and above the water table. Solid schedule 40 PVC flush jointed pipe will be placed downhole above the screened PVC and to approximately 2 feet above ground surface. The borehole will be backfilled with sand to 2 feet above the screened interval with a 1 foot bentonite plug on top of the sand. Sand will then be placed downhole to approximately 1 foot below the ground surface. The hole will then be cement filled to the surface sloping the ground surface pad away from the well. Prior to cementing the hole, a 6 inch diameter steel protective casing with a locking cap will be placed around the 2 foot stickup. Well Development once the wells have been installed, the wells will be developed to remove fine soil materials in and around the screen, allowing water to flow freely. The wells will be developed by surging water or air through the well screen and into or out of the surrounding material. This process is important in that it removes materials that have built up in the openings of the screen during the well drilling and installation processes; it removes fines from the sides of the boreholes that resulted from the drilling; and it stabilizes the fine materials that remain in the vicinity of the well and retards their movement into the well. A major benefit of well development is that it decreases corrosion and encrustation, and it provides for a more represen- tative sample of the aquifer. Location and Number of Monitoring Wells Following an initiation meeting with the City and McDon- nell Douglas, at least 6 monitoring wells will be installed on the 21 acre site. At this time it is difficult to locate the optimal well locations, because it is unknown what the future development of the site will be. Going on the assumption that 6 wells /boreholes will be drilled, a more detailed research of the available data /information will be performed prior to initiating the drilling program. This will include such data as the geophysical survey performed by Sperry at a nearby location. After review of available data and discussions with McDonnell personnel, preliminary borehole locations can be established. The upgradient well should be drilled first and subsequent boreholes /well will be located based on an iterative process. That is, the boreholes /wells will be located based on visual observations and HNu readings of the subsurface material. This iterative process has proven very successful on several similar projects. Borehole /Well Survey In order to generate an accurate potentiometric surface map of the groundwater levels, it is necessary to survey the elevations of the wells. The elevations will be measured with a Pentax PAL -1 automatic level and will be referenced to a bench- mark in the area. This information will allow the determination of gradient, flow and direction of the groundwater. Water Sampling Water sampling of the six wells will be conducted one week following well installation. This will allow the wells suffici- ent time to reach static water level. Following water level measurements, each well will be bailed removing at least three volumes of water prior to sampling. Samples will be placed in bottles with appropriate preservatives and placed on ice for transport to the lab. All necessary chain of custody forms will be initiated with the collection of onsite samples and followed through the handling and analysis of the samples. Analytical Requirements The analytical requirements for soil and water samples will include the EPA Priority Pollutants List including: Metals Antimony Arsenic Beryllium Cadmium Chromium Copper Lead Nickel Mercury Selenium Silver Thallium Zinc oragnics EPA 624 Volatile Compounds EPA 625 Base Neutral Compounds EPA 625 Acid Compounds EPA 625 Pesticides & PCB Oil & Grease will be analyzed from soil collected from the first 5 feet of each hole. Decontamination All sampling and drilling equipment will be decontaminated between the drilling and sampling of each well to prevent cross contamination. Health and Safety Upon award of the contract, a health and safety plan will be submitted prior to initiating any field work. This is a necessary part of the investigation, especially due to the unknown historical use of the site. 2.3 Reporting Following review of all existing information, collection of onsite data and laboratory analysis of all samples, a final report will be prepared describing the existing conditions of the site. The report will specifically address the objectives of the study outlined above and include: o Characterization of the site subsurface geology; o Characterization of the site subsurface hydrology; o Identification of any chemical contaminate found onsite; o Assessment of physical and chemical properties of the soil and water found onsite; o Evaluation of the contaminates' potential for incurring adverse effects to human health and the environment. This report will be presented to the City and McDonnell Douglas in draft form for review and comment.