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Home My WebLink AboutDERR-2024-012819 GSH Geotechnical, Inc. 473 West 4800 South Salt Lake City, Utah 84123 Tel: 801.685.9190 Fax: 801.685.2990 www.gshgeo.com Page 1 May 20, 2024 Job No. 3903-001-24 Mr. Seid Diglisic Diglisic Holdings, LLC Mr. Diglisic: Re: Report Site Management Plan Former Construction Power Solutions Property 805 North Redwood Road North Salt Lake, Utah Contents 1. INTRODUCTION .....................................................................................................................2 2. PREVIOUS ENVIRONMENTAL REPORTS ..........................................................................2 3. CONTROLS ..............................................................................................................................3 3.1.CONSTRUCTION ACTIVITIES ........................................................................................3 3.2. SOIL EXCAVATION AND STOCKPILE MANAGEMENT ..........................................3 3.3.STORM WATER MANAGEMENT AND EROSION CONTROL ...................................4 3.4.SITE WORKER HEALTH AND SAFETY ........................................................................4 4. MAINTAINING COMPLIANCE .............................................................................................4 5. DISCUSSION AND CONCLUSION ......................................................................................5 Diglisic Holdings, LLC Job No. 3903-001-24 Site Management Plan Former Construction Power Solutions Property May 20, 2024 Page 2 1. Introduction GSH Geotechnical, Inc. (GSH) is pleased to submit this Site Management Plan (SMP) prepared on behalf of the current property owner, Diglisic Holdings, LLC. The site is located at 805 North Redwood Road, North Salt Lake, Utah and covers approximately 2.5 acres. This report includes discussions concerning the controls placed on the Former Construction Power Solutions Property as well as the necessary steps to maintain compliance with the controls during the site development. The site formerly belonged to Construction Power Solutions, LLC, which offered full-service equipment rentals and fueling. It is currently planned to redevelop the site into 3,000-3,500 square foot flex spaced condos for commercial purposes. Chemicals of potential concern (COPCs) have been identified in the groundwater and soils within the Former Construction Power Solutions Property. COPCs include TPH-DRO, TPH-GRO, and Oil & Grease, which are associated with past site activities. 2. Previous Environmental Reports A Phase I Environmental Site Assessment 1 was completed on March 29, 2023, by Gordon Geotechnical Engineering, Inc. Within the ESA, Gordon Geotechnical Engineering identified the subject property to have historically stored and fueled asphalt-tar sealing construction equipment as well as an open LUST case on the property. A diesel fuel spill from a broken pipe, surficial staining of what appeared to be petroleum products, and a partially buried, corrugated pipe storage tank was also identified within the report during the site reconnaissance. Due to these RECs, a Limited Phase II ESA 2 was conducted, by Gordon Geotechnical Engineering, in order to determine whether contamination was present on the subject property. The report identified soil and/or groundwater samples above the initial screening levels for Diesel Range Organics (TPH-DRO), Gasoline Range Organics (TPH-GRO), Benzene, Oil and Grease (HEM), and TPRH (SGT-HEM). On May 12, 2023, Wasatch Environmental completed a Subsurface Investigation Report 3 to further investigate the known petroleum impacts at the site, investigate potential releases, and to evaluate potential surface soil impacts at the site. Seventeen (17) borings were drilled, and the results identified soil and/or groundwater samples to be above the initial screening levels for Diesel Range Organics (TPH-DRO), Gasoline Range Organics (TPH-GRO), Oil and Grease, and TPRH. On April 16, 2024, GSH Geotechnical, Inc., completed a Subsurface Soil Assessment 4 to further analyze soil and groundwater contamination at the site. Seven (7) borings were drilled by GSH, 1 Report, Phase I Environmental Site Assessment, March 29, 2023. Gordon Geotechnical Engineering, Inc. 2 Report, Limited Phase II ESA, March 29, 2023. Gordon Geotechnical Engineering, Inc. 3 Report, Subsurface Investigation Report, May 12, 2023. Wasatch Environmental. 4 Report, Subsurface Soil Assessment, April 16, 2024. GSH Job No. 3879-001-24. Diglisic Holdings, LLC Job No. 3903-001-24 Site Management Plan Former Construction Power Solutions Property May 20, 2024 Page 3 and the results identified soil and/or groundwater samples to be above the initial screening levels for Diesel Range Organics (TPH-DRO), Gasoline Range Organics (TPH-GRO), and Oil and Grease. 3. Controls The controls listed below for the Former Construction Power Solutions Property will need to be followed throughout site development. 3.1 Construction Activities - GSH must observe that the site has been grubbed and stripped of non-engineered fill and vegetation prior to the placement of the mandatory surface cover. The grubbed and stripped soils must be deemed to not contain contamination above the action levels for the site. Site soils must not exceed 500.0 mg/kg of TPH-DRO and 1000.0 mg/k of Oil & Grease. Soils that have not been sampled or are above Initial Screening Limits must be moved within the Former Construction Power Solutions Property and placed in designated areas or transported offsite for disposal. - A suitable vapor barrier should be installed below all structures to reduce the risk of vapor intrusion. Exterior pavement, such as asphalt or concrete, acts as a cap and is anticipated to provide sufficient protection for human health. All landscaping should have a minimum of 12 inches of non-contaminated soil (topsoil) between the ground surface and contaminants. - Soils being removed from the site must be tested to meet the site action levels for TPH- DRO, TPH-GRO, and Oil & Grease. Any soils taken off site will need to be disposed of at an appropriate disposal facility. 3.2 Soil Excavation and Stockpile Management Contaminated soils may be stockpiled on the subject site if an impermeable barrier is installed between the stockpile and the underlying surface cover. Contaminated soils may also be stored directly on the exposed natural soils provided they do not contact any of the surface cover. Soils may remain uncovered during the day if they are returned to the excavation. Soils to be stockpiled overnight must be covered by an impermeable barrier. Transportation of excavated soils must follow Department of Transportation regulations. Site vehicles and equipment will need to be decontaminated in a decontamination zone prior to tracking off site. The decontamination process will consist of either a dry brush or high-pressure wash to remove residue from equipment. Dust control will need to be maintained on site and on restricted materials leaving the site or being stockpiled. Diglisic Holdings, LLC Job No. 3903-001-24 Site Management Plan Former Construction Power Solutions Property May 20, 2024 Page 4 3.3 Storm Water Management and Erosion Control Construction activities must adhere to the Utah Pollutant Discharge Elimination System (UPDES) Construction General Permit, which entails implementing a Storm Water Pollution Prevention Plan (SWPPP). Compliance with the SWPPP and adoption of best management practices are mandatory to reduce stormwater impacts and prevent the release of contaminated stormwater. Throughout construction, measures will be implemented to divert stormwater from stockpiles and excavation using methods like covers, temporary berms, or swales. Construction practices will be managed to advert soil erosion, halt sediment entry into stormwater, and reduce the likelihood of stormwater seepage into potentially affected soil. The best management practices for erosion control include storm drain inlet protection devices, silt fencing, stabilizing entrances to minimize off-site tracking, strategic location of temporary stockpiles, etc. 3.4 Site Worker Health and Safety Contractors should have a site-specific Health and Safety Plan that is in compliance with OSHA requirements for Hazardous Waste Operations and Emergency Response. All site workers who may potentially come in contact with impacted soils and groundwater should use the correct personal protection equipment (PPE) to minimize contact with contaminants, this includes gloves, boots, safety vest, etc. Contractors will be responsible for ensuring that both their employees and subcontractors follow suitable health and safety procedures. 4. Maintaining Compliance GSH recommends that a pre-construction meeting for the Former Construction Power Solutions Property be conducted with all parties involved to further discuss and outline procedures and controls. - Site visits will be conducted by GSH to confirm the controls identified in section 3 of this report are being followed. Potential GSH representatives that will conduct the site visits will include Kamryn Griffith and Alan Spilker. - Site visits will be conducted as often as needed to document current activity and compliance with this SMP. Each visit will identify work completed and pictures will be taken of the site to document the on-going work. A letter will be issued with each site visit detailing observations and compliance with this SMP. - Any issues identified during a site visit must be corrected immediately or a plan to fix the issue should be put into place. The issue identified as well as the correction or planned fix to the issue will be documented. Once a plan is in place a follow-up visit will be required to sign off that the past issue has been remedied. Diglisic Holdings, LLC Job No. 3903-001-24 Site Management Plan Former Construction Power Solutions Property May 20, 2024 Page 5 5. Discussion and Conclusion Upon completion of the pre-construction meeting an updated SMP will be issued further detailing site visits, contractor responsibilities, and items that will need inspecting and documentation. The primary point of contact with GSH will be Kamryn Griffith. If you have any questions or would like to discuss these items further, please feel free to contact us at (801) 685-9190. Respectfully submitted, GSH Geotechnical, Inc. Reviewed by: Kamryn Griffith Alan D. Spilker, P.E. Staff Geologist State of Utah No. 334228 President/Senior Geotechnical Engineer KG/ADS: jmt ENCL. Figure 1, Site Location Figure 2, Site Plan Diglisic Holdings, LLC Job No. 3903-001-24 Site Management Plan Former Construction Power Solutions Property May 20, 2024 Page 6 QUALIFICATIONS AND RESUME OF ENVIRONMENTAL PROFESSIONALS GSH Geotechnical, Inc. (GSH) declares that, to the best of our professional knowledge and belief, we meet the definition of an Environmental Professional as defined in §312.10 of 40 CFR 312. We have the specific qualifications based on education, training, and experience to assess a property of the nature, history, and setting of the subject property. Kamryn Griffith Environmental Technician Ms. Griffith has provided technical assistance and performed numerous environmental assessments, remediation projects, and geotechnical studies/inspections under the direction of Mr. Alan D. Spilker, P.E., Environmental Professional for GSH Geotechnical, Inc. Alan D. Spilker, P.E. Environmental Professional Mr. Spilker is a project geotechnical and environmental engineer with over 20 years of experience along the Wasatch Front and Rocky Mountain region. Mr. Spilker has extensive experience in geotechnical engineering, pavement and roadway design, development in mountainous areas, expansive and moisture-sensitive soils, geotechnical laboratory testing, soil contamination remediation, asbestos inspection, and material testing and inspection. Mr. Spilker has conducted Phase I, Phase II, Phase III, and full environmental site assessments for private and public clientele. REFERENCE: ALL TRAILS - NATIONAL GEOGRAPHIC TERRAIN DATED 2024 FIGURE 1 VICINITY MAP DIGLISIC HOLDINGS, LLC JOB NO. 3903-001-24 SITE DIGLISIC HOLDINGS, LLC JOB NO. 3903-001-24 REFERENCE: ADAPTED FROM AERIAL PHOTOGRAPH DOWNLOADED FROM GOOGLE EARTH IMAGERY DATED 7/2023 FIGURE 2 SITE PLAN SUBJECT PROPERTY: