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borings. It will take approximately 10 business days to acquire permit approval to <br /> install the soil borings proposed below; <br /> • Conducting a private utility survey of the proposed sampling areas at the Site using <br /> electromagnetic (EM) and /or ground penetrating radar (GPR) equipment to clear <br /> proposed soil borings for potential utility conflicts; <br /> • Advancing up to twelve (12) exterior soil borings in accessible areas throughout <br /> the Site utilizing a direct push drilling rig and/or hand tools following concrete <br /> coring as needed. Eight (8) of the twelve (12) soil borings will be advanced in the <br /> areas of former buildings at the Site. Four (4) of the twelve (12) soil borings will be <br /> advanced in the vicinity of previous sampling locations where the highest <br /> contaminant concentrations have been detected/reported. <br /> • Soil borings will be advanced to a depth of five (5) feet below the soil/groundwater <br /> terinterface, to refusal, or to a maximum depth of 25 feet below grade surface <br /> (bgs),whichever is shallower; <br /> • Screening soil samples collected from the borings at continuous intervals for <br /> organic vapors with a photoionization detector (PID), as well as recording a <br /> detailed description of the subsurface lithology; <br /> • If groundwater is encountered, six (6) of the twelve (12) soil borings will be <br /> converted to temporary monitoring wells for groundwater sample collection; four <br /> (4) temporary monitoring wells will be installed within four (4) of the eight (8) soil <br /> borings advanced in the areas of former buildings, and two (2) temporary <br /> monitoring wells will be installed within two (2) of the four (4) soil borings <br /> advanced in the vicinity of previous sampling locations. <br /> • Collecting one (1) groundwater sample from each of the temporary monitoring <br /> wells for laboratory analysis; <br /> • Groundwater samples will be collected using low flow sampling techniques with <br /> turbidity measured in the field; <br /> • Up to twelve (12) soil samples will be analyzed for volatile organic compounds <br /> (VOCs) using Environmental Protection Agency (EPA) Method 8260; California <br /> Extended Range Total Petroleum Hydrocarbons (CAER TPH) using modified EPA <br /> Method 8015; Organophosphorous Pesticides using EPA Method 8141; and <br /> California Code of Regulations (CCR) Title 22 Metals using EPA Method <br /> 6010/7470. <br /> • Up to six (6) groundwater samples will be analyzed for VOCs using EPA Method <br /> 8260 and CAER TPH using modified EPA Method 8015; <br /> • Upon completion of sampling, the temporary monitoring wells will be removed; <br /> the borings will be backfilled in accordance with applicable requirements; and the <br /> surface cover will be patched with concrete, as appropriate; <br /> • Nova anticipates that investigation derived waste (IDW) that will be generated <br /> during this Limited Subsurface Investigation will include soil cuttings and <br /> decontamination water from drilling operations. Nova will direct the drilling <br /> contractor to containerize the IDW generated in to 55-gallon DOT drums. The <br /> IDW drums generated will be stored at the Site pending results of analytical <br /> characterization. <br /> LONGHORN PORTFOLIO 2325 W.LOUISE <br /> PAGE 2 JANUARY 3,2017 <br />