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Cleanup Program — Sacramento Office Cleanup Program — Sacramento Office California Department of Toxic Substances Control California Department of Toxic Substances Control 4 August 2020 4 August 2020 Page 5 Page 6 other non-disposable sampling equipmentwill be decontaminated using distilled water and light soil. It is anticipated that drill rigs and equipment will be left on-site overnight throughout the duration detergent prior to collecting each sample and prior to starting a new boring. The soil sampling and of the Investigation (approximately 6 to 12 days, depending on availability of multiple drill rigs) to analysis plan is summarized in Table 1 and detailed in the sections below. minimize the vehicle and equipment traffic entering and exiting the Site. Ste access will be from mccloy Avenue via the gravel access road located along the eastern edge of the Site to limit vehicle traffic As part of the geotechnial investigation, soil samples will be collected from the borings at approximate through the exposed soil areas. 5-foot intervals using Standard Penetration Test (SPT) and Modified California spirt-barrel samplers or sing Shelby tubes In order to collect relatively undisturbed samples of soft f n"rained soils. In Investigation derived waste (IDW) consisting of drilling fluids, decontamination water, and soil cuttings addition, bulk sa mples of soil placed in 5-gallon buckets with lids will be collected for pavement design will be containerized separately in appropriately labeled Department of Transportation-rated SS-gallon purposes. Select samples will be submitted to a geotechnical laboratory to perform one or more of the steel drums. Due to the likelihood of encountering soil exceeding the California hazardous waste criteria following tests: moisture content, grain-size distribution, Atterberg limits, expansion index, shrink-swell for arsenic, the soil cuttings from the upper 5 fee[ at locations within or In close proximity to areas with potential, strength, compressibility, permeability, Modified Proctor, resistance value (it-value) on known elevated arsenic concentrations will be segregated into separate drums for characterization and untreated nearsurface soil, R-value on lime- or cement-treated soil, and corrosivity characteristics, as disposal. The generated IDW will be temporarily staged in a secure on-she storage area during the waste appropriate, characterization process and prior to appropriate offsite disposal. The IDW will be sampled, profiled, and disposed of at an appropriate facility by a licensed wane transportation contractor. It is anticipated As part of the limited environmental investigation, soil samples will be collected from 10 of the that the drums will be transported to and disposed of at US Ecology Nevada, Inc. in Beatty, Nevada, proposed hollow stem auger borings (Table I and Figure 2). The environmental soil samples will be which is a Class I disposal facility and an accept non-hazardous and California hazardous waste. DTSC collected from depths of approximately 1 to 1.5 feet bgs and 3 to 3.5 feet bgs and placed in laboratory- and CVRWQCB will be notified if a different disposal facility is selected to receive the waste. Drums provided glass jars with Teflon®-lined lids. The shallower IS to 1.5 feet bgs) sample at each location will identified to contain hazardous waste will be transported off-she for disposal no later than 90 days upon be collected from beneath the sur icial gravel layer and the depth may be adjusted slightly depending on receipt of analytical results. the local thickness of the gravel. Sample jars will be labeled with the corresponding sample ID, time, date, project name, and client name, sealed in a plastic bag, and placed in an ic"ooled chest. Reporting Environmental soil samples will be submitted following standard environmental handling methods and This Work Plan's proposed investigation activities are scheduled to begin in August 2020, upon approval under chain-of-custody documentation to a California-certified analytical laboratory for the following: of this Work Plan by the DTSC and issuance of the Well & Boring Permit by the SICEHD. Haley & Aldrich will document this investigation with an Investigation Report summarizing the results of this • California The 22 metals using United Stated Environmental Protection Agency (USEPA) Method investigation. 6010/7471; Please feel free to contact the undersigned if You have any questions or require additional information. • Organochlorine pesticides using USEPA Method 8081; and • PAHs using USEPA Method 8270C-SIM. Sincerely yours, HALEY & ALDRICH, INC. s The environmental soil sample results will be compared against the established background threshold d� values and proposed preliminary r<mediation goals for Site 47 and evaluated for special on-site handling requirements, which will be Incorporated into the site management plan to be developed for the °{ s ^'• 0 proposed construction activities. Adam Piestneniewicz, PG ` • 11} r �a �Y\=parowwi Assistant Project Manager Princ at Consultant Soil Management CA PG #9669 Dust generation will be mitigated by wetting the surface soil in the proposed drilling area immediately prior to beginning drilling activities. Dust emissions will be monitored visually and if any dust emissions greater than 20 percent opacity (i.e. dust obscures greater than 20 percent of a visible object) are observed, work will stop until the dust has settled or it has been knocked down by potable water. Soil Will be cleaned off vehicles and equipment prior to leaving the Site W prevent the off-site track out of L�LDRICH N..DRICH