SR2501523 - Laserfiche WebLink

Home Browse Search

Cleanup in Vulnerable Communities'Initiative Discovery Project Reference:Favorite Cleaners and Enforcement Discovery Investigation Work Plan Project Number:60688620 collected at 5 and 15 feet bgs, and the sample identifications will indicate depth(e.g., SG-1-5'for the sample collected at 5 feet bgs and SG-1-15'for the sample collected at 15 feet bgs from soil vapor probe location SG-1). Additionally, six sub-slab vapor samples will be collected from within the Favorite Cleaners facility.The six sub-slab vapor pins will be located within the interior of the commercial building, and they will be paired with indoor air samples. One sub-slab vapor sample(SSV-1)will be collected in the former Boiler Room/current Kitchen southern side of the building. Two samples(SSV-2 and SSV-3)will be collected from the former Favorite Cleaners'building. Two samples(SSV-4 and SSV-5)will be collected from the J&S Flowers shop.One sample(SSV-6)will be collected from Carmen's Barber shop. Table 1 presents a summary of the active soil vapor and sub-slab vapor sampling and analyses planned for this Discovery Investigation. The proposed soil vapor and sub-slab vapor sample locations are depicted on Figures 4A and 4B. The sampling protocol for soil vapor and sub-slab vapor samples is discussed in Section 3.2.5.2 below. The analytical methods for soil vapor and sub-slab vapor samples are summarized in Section 3.2.6.1 below and Table 1. Field QC samples to be collected are discussed in Sections 3.2.5.6. and 3.2.6.4 below. The soil vapor probes, and sub-slab vapor pins will be decommissioned once approval has been received from the DTSC Project Manager per the attached decommissioning protocols in Appendix B. 3.2.2 Soil No soil matrix samples will be collected for laboratory analyses. To assist in planning soil vapor sampling depths, eight boreholes will be advanced at the soil vapor sampling location(s).At least one borehole will be continuously cored and will be completed to 16 feet bgs.The lithology of the cored samples will be logged in the field.The soil boring will be logged to terminal depth using the United Soil Classification System. Headspace testing will be performed using a photoionization detector(PID)to assess the presence of VOCs in recovered soil samples. Lithologic description and headspace testing will be documented on the boring logs. 3.2.3 Groundwater If groundwater is encountered, grab groundwater sampling will be performed in accordance with the Programmatic QAPP,which was prepared in accordance with the following Programmatic QAPPs for groundwater investigations: • Representative Sampling of Groundwater for Hazardous Substances(Cal EPA 2008); • Drilling, Logging, and Sampling at Contaminated Sites(Cal EPA 2013); • Well Design and Construction for Monitoring Groundwater at Contaminated Sites(Cal EPA 2014); and • Guidelines for Planning and Implementing Groundwater Characterization of Contaminated Sites(Cal EPA 2012). If groundwater is encountered during advancement of the boreholes for soil vapor well installation, grab groundwater samples will be collected from the boreholes. Groundwater samples will be collected in appropriate containers, stored in properly chilled coolers, and delivered to a California Environmental Laboratory Accreditation Program (ELAP)-certified laboratory. Groundwater samples will be analyzed for VOCs(including fuel oxygenates)using USEPA Method 82608. In addition, if needed, equipment rinsate blank samples will be collected as set forth in Section 3.2.5.6 below. Table 2 presents a summary of the water matrix sampling and analyses planned for this Discovery Investigation. The proposed groundwater sample locations are the same as soil vapor sampling locations(SG-1 to SG-6)and are depicted on Figure 4A. The sampling protocol for groundwater samples is discussed in Section 3.2.5.4 below. The analytical methods for water samples are summarized in Section 3.2.6.2 below and Table 2.The field QC samples to be collected are discussed in Sections 3.2.5.6 and 3.2.6.4 below. Prepared for: California Department of Toxic Substances Control AECOM 13