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A=COM will be lowered into the temporary casing, and a groundwater sample will be collected. Following sample collection, the PVC casing will be removed and the boring destroyed. 2.4 Task 4—Boring Abandonment Upon completing of sampling, each of the borings will be grouted to the surface using neat cement with a ratio of one-bag (94 pounds) of type 2 Portland cement and five gallons of fresh water. All borings will be grouted to surface and patched with appropriate materials (i.e. concrete, asphalt, etc.) by the driller. No permanent wells will be installed, and all exploratory soil borings will be completed in a single, one-day event. 2.5 Task 5—Sample Handling and Documentation Soil and groundwater samples will be containerized in the appropriate jars, sealed, labeled, and placed on ice in a cooler pending delivery to the offsite laboratory with a separate, signed chain- of-custody record enclosed in each cooler. Chain-of-custody procedures provide an accurate written record tracing the possession of individual samples from the time of field collection through laboratory analysis. The chain-of-custody record also documents the samples collected and the analyses requested. 2.6 Task 6—Sample Analyses Up to six soil samples and/or two groundwater samples will be submitted to a laboratory certified in California for analysis of the following parameters: • Total Petroleum Hydrocarbons (TPH) Diesel Range Organics via EPA Method 8015M; and • Benzene, toluene, ethylbenzene, and xylenes (BTEX) via EPA Method 8260C. 2.6 Task 6—Decontamination and Investigation-Derived Waste Drill rods and reusable sampling equipment from temporary groundwater grab sampling will be properly decontaminated — initially, and after each use to ensure sample quality and eliminate potential cross-contamination between locations. Drilling and re-useable sampling equipment will undergo a three-stage procedure involving a non-phosphate detergent wash, potable water rinse, and deionized water final rinse. Investigation-derived waste (IDV) includes disposable personal protective clothing (i.e. nitrile gloves) and sampling equipment, including core liners will be disposed of as non-hazardous waste and removed by the driller. Although it is not expected, any excess soil from borehole drilling, soil sampling intervals; and decontamination water will be containerized, labeled, and stored in 5-gallon drums onsite pending the analytical data results. Analytical data generated from the soil and groundwater investigation will be used to profile the investigation-derived waste for disposal at an approved facility if required.