Site-specific Environmental Investigation

Post InformationPosted At:Wed, Apr 10, 2024 8:28 AMSealed Bid Process:Yes (Bids Sealed / Pricing Sealed)Private Bid:NoOverviewSummaryThe Sacramento Housing and Redevelopment Agency (SHRA) requests proposals from qualified environmental consultants to conduct a comprehensive Site-specific Environmental Investigation as outlined in the Equitable Community Revitalization Grant (ECRG) for the Twin Rivers Triangle Residential Site (Site). The Department of Toxic Substances Control’s Office of Brownfields ECRG program provides competitively awarded grants to incentivize cleanup and investment in disadvantaged areas of California. The program gave California communities an unprecedented opportunity to address historic environmental injustices and set a new path for land use that will have immediate and lasting benefits. SHRA has been awarded a grant for a site-specific environmental investigation from ECRG. The Site is located at 1451 Sproule Ave, Sacramento CA; The site has been identified

to include concentrations of arsenic and lead in soil that have exceeded conservative human health screening levels developed by the Department of Toxic Substance Control (DTSC) and the U.S. Environmental Protection Agency (EPA). In addition, low levels of volatile organic compounds and semi-volatile organic compounds were reported in some samples. The previous Site investigation reports are available to the bidders in electronic format through EnviroStor (Twin Rivers Triangle Site 60002861). This information can be accessed via this link: EnviroStor (ca.gov). The general project objective is to provide a cleanup Response Plan that will be approved by DTSC. The overall Dos Rios Triangle site includes 3.21 acres of land that has been subdivided into two parcels: The light rail parcel (0.86 acres) and the residential parcel (2.35 acres). The light rail parcel, which is the western parcel along 12 th Street, has been separately assessed and cleaned to a DTSC approved non-residential use standard. Construction of the light rail station will commence in 2024. The subject of this RFP is the adjacent residential parcel, which lies primarily along 16 th Street. Construction on the residential parcel is tentatively scheduled to begin in 2029. The ECRG program requires that the residential parcel be cleaned to a non-restricted standard that will not require an ongoing Operations and Maintenance Plan. Please see the attached site map (Figure 1).The budget for this project is $750,000.00 and it is the intent of SHRA to award one (1) consulting firm for all requested services. SHRA will only work with one Project Manager for all services, whether certain services are subcontracted or not. Subconsultants and/or subcontractors proposed to be used by the consulting firm shall be listed as part of the Statement of Qualifications submitted in response to this solicitation. A firm or individual will not be considered if listed on a State Water Resources Control Board disqualified list or any other local, State or Federal debarred or disqualified list.BackgroundSite BackgroundThe Site has historically been used by companies conducting salvage, equipment manufacturing, refrigeration, wrecking, auto sales, automobile manufacturing, and truck repair. Due to the former uses of the Site, it is necessary to remove arsenic and lead impacted soils that pose a threat to human health and the environment. SHRA is voluntarily conducting and funding a voluntary Removal Action Response under a California Land Reuse and Revitalization Act (CLRRA) agreement administered by DTSC at the Site. SHRA has entered into a CLRRA agreement with DTSC for the redevelopment of the Site. The CLRRA process provides immunities from liability for eligible property owners to conduct a site investigation and implement a response action, if necessary, to ensure the readiness of the property for reuse. DTSC is designated as the lead agency overseeing the removal action, case closure, and document review.Past Site Investigations A Phase I ESA was conducted by Nichols Consulting Engineers, CHTD (NCE) in 2013 and updated in 2014 (NCE 2014). The 2016 ESA report incorporated updates to the previous 2014 Phase I ESA report, and included parcel additions APNs 001-0103-001, 001-0103-002, 001-0103-003, 001-0103-006, 001-0103-008, and 001-0103-010, which together comprise the Site. Together the Phase I ESA report and its updates included (1) evaluation of past and current activities at the Site and adjacent properties; (2) review of geologic and hydrogeologic literature pertaining to the Triangle Site; (3) a site reconnaissance to identify recognized environmental conditions (REC); (4) evaluation of past treatment, recycling, and disposal of any observed hazardous materials at the Triangle Site; and (5) reviews of aerial photographs and federal, state, and regional databases. NCE performed a Phase II ESA based on findings of the previous Phase I ESAs at the Triangle Site (NCE 2016b). The Phase II ESA followed a phased approach, with an initial investigation in January 2014 that included utility locating, a geophysical survey of APN 001-0103-001 conducted by Advanced Geological Surveys (AGS), excavation of test pits, and soil sampling and testing. In May and July 2016, a geophysical survey of APN 001-0103-010 occurred, as well as the advancement of eight direct-push soil borings, excavation of additional test pits ranging in depths from 0.5 to 7 feet bgs, soil sampling, groundwater well sampling for VOCs, SVOCs, TPH, and dissolved Title 22 metals from eight temporary groundwater wells, and a soil gas investigation for VOCs with nine temporary soil gas wells. Application of the California WasteExtraction Test Method (WET) detected, in 6 samples, lead concentrations ranging from 5.5 to 29 milligrams per liter (mg/L), exceeding the soluble threshold limit concentration (STLC) for lead (5 mg/L); application of Toxicity Characteristic Leaching Procedure (TCLP) analysis indicated lead concentrations in five samples, ranging from 0.15 to 0.98 mg/L—less than the TCLP criterion of 5 mg/L; 14 samples were analyzed for VOCs; 14 samples were analyzed for SVOCs; 20 samples were analyzed for TPH; 14 samples were analyzed for PCBs; 7 samples were analyzed for asbestos; and groundwater samples were analyzed. Objectives of Phase II activities were to assess presence of areas of contamination from previous uses at the Triangle Site, and to assist in planning for management of potentially contaminated soil and/or groundwater possibly to be encountered during future reuse/construction. Following the Phase II ESA, Advanced Geological Surveys (AGS) conducted a geophysical survey to assess presence of USTs. In addition, TEG performed a soil gas investigation because of detected presence of volatile organic compounds (VOC) in the grab groundwater samples. The findings of the Phase II investigations in 2014 and 2016 indicated the following:Geophysical data did not appear to indicate the potential presence of an underground storage tank. Fill material appeared to extend vertically from the ground surface to 2.5 to 3 feet below ground surface (bgs) at most of the test pit locations and to depths of at least 5 to 8 feet in two test pits excavated at the northern parcel, APN 001-0103-001.Elevated concentrations of one or more of the following contaminants of concern (COC) were present in near surface soils at certain locations related to previous uses at the Site: arsenic, lead, and thallium. Figures 3, 4, and 5 demonstrate the site sample results for lead, arsenic, and thallium, respectively from the Phase II investigation. In addition, low levels of volatile organic compounds (VOC) and semi-volatile organic compounds were reported in some samples.Groundwater sample results indicated chloroform and toluene were the only VOCs detected above laboratory detection limits. Dissolved metals results including barium, cobalt, molybdenum, nickel, and silver exceeded applicable screening levels (SL). Laboratory reporting limits were higher than U.S. Environmental Protection Agency (EPA) maximum contaminant levels (MCL) for analytes, including arsenic and lead.Soil vapor sample results indicated that Freon was detected in one sample above the laboratory reporting limit but below the applicable SLs. Tetra Tech, Inc., (Tetra Tech) performed a Site Assessment (SA) in 2020 and 2021 based onfindings of the previous Phase I and Phase II ESAs at the Triangle Site (Tetra Tech 2021). Tetra Tech’s 2020 investigation findings included:Five groundwater samples were collected from four groundwater wells at the Site. No VOCs were detected at concentrations above the laboratory reporting limit. Arsenic concentrations ranged from below the laboratory detection limit (0.002 milligrams per liter [mg/L]) to 0.0015 mg/L; lead concentrations ranged from below the laboratory detection limit (0.0006 mg/L) to 0.0015 mg/L; and thallium concentrations were all below the laboratory detection limit (0.0005 mg/L).A total of 27 subsurface soil samples were collected for arsenic, lead, and thallium analyses at depths ranging from 1 to 8 feet bgs. Arsenic concentrations ranged from 4.4 to 11 milligrams per kilogram (mg/kg), lead concentrations ranged from 4.7 to 430 mg/kg, and thallium concentrations ranged from 0.093 (estimated) to 0.17 mg/kg.A total of 31 surface and near-surface soil samples were collected for OCP analysis. The following OCPs were detected: 4,4-dichlorodiphenyldichloroethane, 4,4, dichlorodiphenyldichloroethylene, 4,4-dichlorodiphenyltrichloroethane, chlordane, and dieldrin. Sample results indicated dieldrin concentrations in two samples exceeding applicable regulatory SLs.Ten soil gas samples were collected from nine temporary soil gas wells at the Site. VOCs detected included benzene at concentrations above the DTSC SLs and tetrachloroethene (PCE) at concentrations San Francisco Bay Regional Water Quality Control Board environmental screening levels (ESL).Arsenic background soil concentration was calculated as 9.0 mg/kg. The 2021 supplemental Site investigation findings included:A total of 18 soil samples were collected for OCP analysis. Soil sample results indicated that dieldrin concentrations in three samples exceeded applicable regulatory SLs. These exceedances occurred at TR-OCP2E2-6, TR-OCP2S1-6, and TR-OCP9S1-6, ranging from 35 to 330 micrograms per kilogram (μg/kg).A total of 63 surface, near-surface, and subsurface soil samples were collected for arsenic, lead, and thallium analyses. Exceedances of arsenic in surface soils of background concentrations ranged from 10 to 380 mg/kg. Exceedances of arsenic in near-surface soils of the established background concentrations ranged from 10 to 190 mg/kg. In eight surface soil samples and three near-surface soil samples, arsenic concentrations exceeded the established background concentration of 9 mg/kg in soils. Lead concentrations in 17 surface soil samples and 17 near-surface soil samples exceeded the DTSC SL of 80 mg/kg for lead in soils. Lead exceedances of the DTSL SL in surface soil ranged from 110 to 950 mg/kg. Lead exceedances of the DTSL SL in near-surface soils ranged from 80 to 1,400 mg/kg. Thallium was not detected above the applicable SL of 0.78 mg/kg.A total of 21 soil gas samples were collected for VOC analysis from 15 temporary soil gas wells at the Site. In 12 soil gas samples, PCE concentrations exceeded DTSC SL and the San Francisco Bay Regional Water Quality Control Board (RWQCB) ESLs, and in one soil gas sample, trichloroethene (TCE) concentration exceeded the applicable SL, and exceeded the DTSC SL and the San Francisco Bay RWQCB ESL. Exceedances ranged from 19 to 260 μg/m3. In one sample, TCE concentration was detected above all applicable SLs at 87 μg/m3. All 21 samples were analyzed for helium, for which an ambient air leak up to 5 percent (%) (50,000 parts per million by volume [ppmV]) is acceptable via quantitative tracer testing (DTSC 2015). At one sample location (SV05), the following exceedances of helium (greater than 5%), indicating an ambient air leak, were detected: TR SV05-120, 7.9% and TR SV05 120- DP, 8.6%. All other results were below 5% (50,000 ppmV). The 2022 Soil Gas Investigation findings include:Soil gas investigation conducted in 2022 at Twin Rivers Triangle Site in Sacramento, California. Aimed to assess vapor intrusion risks into residential or commercial indoor air.Findings revealed presence of bromodichloromethane, chloroform, tetrachloroethene (PCE), and trichloroethene (TCE) in soil gas, exceeding regulatory screening levels (SLs).PCE plume not completely delineated on site, concentrations highest at northeast and southern boundaries as well as off-site. Elevated VOC concentrations detected in soil gas, likely from past practices by previous occupants. PCE and chloroform exceedances above residential regulatory SLs but below commercial/industrial SLs at Light Rail Property. Further investigation warranted for indoor air quality at locations with PCE exceedances. Additional site investigation recommended for remaining site where future planned use is mixed residential and commercial. TimelineDate RFP Issued:April 10, 2024First Pre-Proposal Meeting (Non-Mandatory):April 17, 2024, 10:30am Via Zoom: Register in advance for this meeting: https://shra-org.zoom.us/meeting/register/tZUkf-2trD0vHdA3ObNh0n4ffWoxjDPIDZdf After registering, you will receive a confirmation email containing information about joining the meeting.Second Pre-Proposal Meeting:April 23, 2024, 2:30pm Via Zoom: Register in advance for this meeting: https://shra-org.zoom.us/meeting/register/tZIkd-ypqT8uHNQZnNmN5bsKSSagKE1qgjRh After registering, you will receive a confirmation email containing information about joining the meetingRequest for Information (RFI) Due:April 25, 2024, 12:00pmAddendum (if necessary) issued:April 29, 2024, 2:00pmProposals Due:May 7, 2024, 2:00pmNotice of Intent to Award (anticipated):May 14, 2024Contract start (anticipated):June 3, 2024