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HomeMy WebLinkAboutRES 1995-24 - Board RESOLUTION NO. 9524 OF THE • TRUCKEE DONNER PUBLIC UTILITY DISTRICT SETTING FORTH CRITERIA'FOR SELECTING A PROFESSIONAL ENGINEERING FIRM TO ASSIST WITH'IMPLEMENTATION OF THE GROUNDWATER ASSESSMENT WORK PLAN WHEREAS, the Truckee Donner Public Utility District has been ordered by State Water Quality Control Board, Lahontan Region Clean-up and Abatement Order No. 6-86-10 to perform groundwater monitoring as a result of finding petrochemical contamination in the soils and groundwater at the District complex located at 11570 Donner Pass Road, Truckee, CA; and WHEREAS, the Board of Directors of District wishes to comply with the Lahontan Order prior to October 15, 1995; and WHEREAS, California Government Code Section 4526 states that selection of professional engineering services shall be on the basis of demonstrated competence and on the professional qualifications necessary for the satisfactory performance of the services required at fair and reasonable prices. NOW, THEREFORE, BE IT RESOLVED by the Board of Directors of the Truckee Donner Public Utility District as follows: 1. That the General Manager be authorized, in accordance with Government Code Section 4527, to encourage firms engaged in the lawful practice of the engineering profession to submit statements of qualifications and performance data. The statements and data shall then be evaluated by the General Manager and discussions shall be conducted with no less than three of the qualified firms. 2. That the General Manager be authorized to select therefrom, in order of preference the firms deemed to be the most highly qualified to provide the services required. 3. That the General Manager negotiate a draft contract with the best qualified firm for engineering services at compensation which is fair and reasonable. 4. That the Board consider the draft contract negotiated by the General Manager and, if found to be satisfactory, authorize its execution. PASSED AND ADOPTED by the Board of Directors at a meeting duly called and held within the District on the 7th day of August 1995 by the following roll call vote: AYES: Aguera, Hemig, Maass and Jones. NOES: None. ABSENT: Sutton. • TRUCKE_ ER PUBLIC UTILITY DISTRICT By _ Peter L. Holzmeister, 'Clerk of the Board . ATTES Susan A Craig, Deputy District Wrk Smc TRUCKEE DONNER PUBLIC UTILITY DISTRICT GROUNDWATER ASSESSMENT WORK PLAN August 7, 1995 The Truckee Donner Public Utility District (TDPUD or District) has prepared this work plan to respond to the California Regional Water Quality Control Board, Lahontan Region's, (Lahontan) Clean-up and Abatement Order, No. 6-86-10 of March 1986 and the most current correspondence of September 27, 1994. SITE DESCRIPTION The TDPUD site is located at 11570 Donner Pass Road in Truckee, California and in Section 16 of T17N, R16E, Plate 2 shows the site vicinity; the Nevada County Assessor's parcels are 186-02-03 and 186-02-04. The site soils consist of granular alluvial soils including silty sands and sandy gravels with occasional cobbles, based on test pit logs Klienfelder, Inc. prepared during the soils investigation for the existing TDPUD building in 1985. Groundwater has been reported at less than 15 feet both on TDPUD's site and on the Truckee Fire Protection District Station No. 2 site across Donner Pass Road and was encountered at approximately four to six feet below site surface during Kleinfelder's July 1994 field work. Western Geo- Engineers assessed groundwater at the Fire District site across Donner Pass Road from 1988 to 1990 and showed a consistent southeast flow direction. PROJECT BACKGROUND . The TDPUD acquired the site in 1969 from the California Department of Agriculture, who formerly used the site and building as a border crossing inspection station. TDPUD used the station as their headquarters until constructing the existing building in 1987. In 1985, fuel was encountered in one test pit, excavated as part of a soil foundation assessment for the proposed TDPUD building. In March 1986, Lahontan issued a Clean-up and Abatement Order to the District to clean-up and abate the effects of the discharge and threatened discharge of petroleum hydrocarbons to goundwaters of the Truckee River Hydrologic Unit. During site grading in 1987, an unknown heating oil underground storage tank (UST) was uncovered and removed. TDPUD also removed its 500 gallon diesel UST and a 2,000 gallon gasoline UST in June 1987 and March 1987 respectively. The District used these underground storage tanks to fuel service vehicles and equipment. In April 1987, TDPUD removed approximately 200 cubic yards of contaminated soil from around the gasoline UST. In September 1987, additional excavation was conducted, however, not all affected soil was removed due to the presence of underground utility lines along Donner Pass Road. In December 1988, Lahontan ordered the TDPUD to perform a "satisfactory groundwater investigation and clean-up to comply with Clean-up and Abatement Order No. 6-86-10. In June 1989, TDPUD submitted a proposed Groundwater Quality Assessment and Monitoring Plan for the District site. The plan was not implemented and, on February 7, 1994, Lahontan again requested groundwater be assessed. In July 1994, Kleinfelder conducted the initial groundwater assessment by collecting groundwater samples by GeoProbe at eleven locations at the District's office complex. The analyses showed gasoline-range constituents in three sample points and diesel-range constituents in two sample points. All sample points - 1 - with detectable and reported results lay around the customer parking lot area. Groundwater flow direction was not calculated but was presumed to flow towards the southeast, based on previous work at the Truckee Fire Protection District Station No. 2 across Donner Pass Road. PURPOSE OF WORK PLAN This work plan responds to Lahontan's requirement that additional assessment of groundwater be conducted for fuel hydrocarbons. The first intent of the current scope is to assess the groundwater approximately where the former USTs are presumed to have lain and to establish worst case concentrations of contamination. A second intent is to establish whether fuel has moved in groundwater off site in a downgradient direction. This direction is presumed southeast. Groundwater flow direction will be calculated with on-site surveyed points before the off-site sampling is conducted. Should groundwater not flow in the presumed direction, the location of the off-site sample points will be appropriately changed. The third intent is to confirm the initial contaminants reported in the first GeoProbe assessment of July 1994, and to monitor variations in groundwater depths, flow direction and contaminant concentrations over time at permanent monitoring wells. WORK PLAN TASK 1 Clear sample points for utilities; acquire permits and off-site access permission Prior to water sample collection, the proposed sample points will be marked in white paint. These points will be cleared for underground utilities using the Underground Service Alert (USA). In addition, a private utility location service will be used to clear the sample points due to the number of different utilities buried along Donner Pass Road. After utility clearance is complete, the sample locations will be adjusted, as needed, to help in avoiding marked utilities. Encroachment permits will be obtained as needed for the public right-of-way along Old Donner Pass Road. Legal access will be obtained by TDPUD from the neighboring Century 21. The consultant will notify Century 21 of the sampling schedule. The consultant will work with the drilling company to obtain the necessary permits from and pay the required fees to the Nevada County Division of Environmental Health before commencing field activities and comply with the permit requirements. TASK 2 Install, develop and sample four groundwater monitoring wells Four monitoring well's will be drilled and installed in the approximate locations shown on Plate 2 using a truck-mounted, hollow stem auger rig. The driller will have a current C-57 license and all field personnel will have current 40-hour OSHA health and safety training. During drilling, soil samples will be collected at approximate five foot intervals to log soil types. Samples will be retrieved in a modified California sampler(MCS) driven by the drill rig into undisturbed soils at the targeted depth. At least one sample will be saved at each sample point in the brass liner sleeves from the MCS, labelled, sealed and stored in an iced cooler. A portion of each soil sample retrieved will be placed in a closed container and the head space measured with an organic vapor analyzer. The measurement will provide a qualitative indicator of the presence or absence of volatile organics. Based on the organic vapor analyzer readings, up to two soil samples from each boring will be selected and submitted for organic analyses. The laboratory will be certified by the U. S. Environmental Protection Agency and the California Department of Health Services. The samples will be analyzed for total petroleum hydrocarbons-diesel(TPH-D), total petroleum hydrocarbons-gasoline(TPH- G) by modified EPA Method 8015, and for benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA Method 602 or 624. Analyses and detection limits will be in accordance with the Tri-Regional Board Staff Recommendations of August 10, 1990. - 2 - . The monitoring wells will be constructed in accordance with Lahontan well construction guidelines. The wells will be constructed with two-inch diameter, schedule 40 PVC casing material, approximately 20 feet in total depth, and screened with 0.020-inch slot screen five feet below and five feet above the encountered water table. The annular space around the screened interval will be filled with silica sand to at least two feet above the top of the screen interval, and sealed with a minimum two feet thick bentonite pellet plug above the sand pack. The remainder of the annular space above the bentonite seal will be filled with a cement/bentonite slurry to the ground surface. A screw cap will be placed at the bottom of the screen section, and a steel traffic-rated locking cover will be placed in the slurry at the top of the well, mounted flush with the ground surface. Refer to Plate 3 for typical well construction details. Actual construction may vary somewhat due to site conditions. The wells will be developed at least 48 hours after well installation. The well will then be sampled after at least an additional 24 hours, using a disposable bailer to purge each well of a minimum of five well volumes. During purging, pH, EC and temperature measurements will be collected. Then parameter readings have stabilized, samples will be collected. To prevent cross contamination between wells, the development equipment will be decontaminated before each use and separate disposable bailers and rope will be utilized at each well to collect the samples. During the purging of each well, the purge water will be examined for free product, sheen and petroleum odor. After purging each well, groundwater samples will be collected in clean laboratory-provided containers. One duplicate sample will be collected and analyzed for quality control/quality assurance purposes. A field blank sample set will also be collected and held for analysis if needed. A laboratory- supplied trip blank will accompany the ice chest and samples from the laboratory to the field and back to the laboratory. The samples will be properly labeled, sealed and immediately stored in an iced cooler. The samples will be taken to the laboratory under proper chain-of-custody protocol, and analyzed for TPH-D, TPH-G and BTEX as for the soil samples. Soil cuttings generated from each boring exhibiting evidence of petroleum contamination will be transferred to DOT-approved steel drums and temporarily stored on-site until proper disposal, if needed, can be arranged. Decontamination water generated from steam cleaning, equipment decontamination, sampling activities, and groundwater purging will also be contained and stored on-site in DOT-approved drums. After the results of chemical analyses of water samples are received, arrangements will be made to properly dispose of any waste soil cuttings and water, if and as needed. Since disposal may not be required, this budget shall not include disposal costs. TASK 3 Collect and analyze off-site water samples Groundwater samples will be collected from off-site in the general groundwater flow direction by using the GeoProbe sampling vehicle or an equivalent survey technique. The GeoProbe samples will be collected in the groundwater flow direction, presumed to be southeast as shown in the attached site plan, to assess the spread, if any, of the hydrocarbons off-site. The monitoring wells will be installed and surveyed, and the flow direction calculated, prior to the off-site sampling activities. If the groundwater flow direction is not toward the southeast, the sample points will be relocated. GeoProbe samples will be collected from ten locations. One field day on site is assumed. The attached site plan shows the proposed sample locations. Field activities will be conducted under the direction of a California Registered Geologist or Engineering Geologist. The proposed method, a GeoProbe, mechanically drives a hollow stainless steel probe into the ground to just below groundwater. The probe is retracted approximately two feet, allowing groundwater to enter the vacated borehole. A water sample is then collected under a nominal vacuum drawing the water up a clean polyethylene tube, which directly fills the sample containers. The used tubing will be discarded after each boring and the GeoProbe rods will be decontaminated prior to each use. One water sample set will be collected from each borehole, placed into a clean laboratory supplied container, labeled and placed in an - 3 - iced cooler. The samples will be transported, stored, and relinquished under chain-of-custody protocol TASK 4 Prepare a problem assessment report A problem assessment report will be prepared that summarizes the sampling and analytical procedures, presents tabulated analytical results and provides conclusions regarding the water quality and recommendations for further assessment, if warranted. If groundwater does not show the presence of hydrocarbons, the report will recommend and be written to facilitate a request for site closure by Lahontan. If contamination on-site is confirmed, but off-site spread has not occurred, the report will present general options for remediation, risk assessment and/or long-term monitoring. TASK 5 California UST Clean-up Fund The Underground Storage Tank Clean-up Fund was created by the State of California to help eligible owners and operators of petroleum USTs to: a) Meet federal and state requirements to demonstrate financial responsibility; b) Obtain reimbursement for costs of the clean-up of unauthorized releases of petroleum; and c) Obtain reimbursement for damages awarded to third parties who are injured by petroleum releases. The fund does not cover the removal, repair, retrofit or installation of USTs. The maximum amount available from the fund is $990,000 per occurrence. Claimants are responsible for a minimum of$10,000 deductible of eligible costs. The implementing legislation provided a priority system intended to first reimburse those claimants who are least able to pay the costs of clean-up. The TDPUD may be eligible for Class B or C priority. Consultant will prepare a Claim Application for submittal to the UST Clean-up Fund office smc 4