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' 16 October 2014 <br /> AGE Project No. 13-2675 <br /> ' Page 5of9 <br /> ' GRAB GROUNDWATER SAMPLING <br /> A grab groundwater sample was collected from boring B7 between 36 feet and 40 feet <br /> bsg utilizing a Geoprobe Screen Point 15 Groundwater Sampler TM (GWS). The <br /> groundwater sample was extracted using inertial action by lowering single-use <br /> disposable '/4-inch Teflon tubing with a sampling check-valve through the hollow center <br /> ' of the push rods into the GWS. Sufficient sample was collected to fill three 40-ml EPA- <br /> approved volatile organic analysis (VOA) vials without preservative. Groundwater <br /> sample containers were labeled with soil boring designation, date, time, and samplers <br /> ' initials and then placed in a chilled container. <br /> SAMPLE ANALYSIS <br /> Soil-vapor samples were transported under chain-of-custody to McCampbell Analytical, <br /> ' Inc. (MAI), a California Department of Public Health (CDPH)-Certified laboratory. Soil- <br /> vapor samples collected from borings 134 through B6 were analyzed for the following <br /> chemical constituents: <br /> • TPH-g, volatile organic compounds (VOCs), and isopropyl alcohol in accordance <br /> with EPA Methods TO-15 and 826013. <br /> Groundwater samples were transported under chain-of-custody to Cal Tech <br /> Environmental Laboratories (CTEL), a CDPH-Certified laboratory. Groundwater <br /> samples collected from 137 were analyzed for the following chemical constituents: <br /> • TPH-g in accordance with EPA-method 8015-modified; and <br /> • VOCs in accordance with EPA-method 826013. <br /> ' EQUIPMENT DECONTAMINATION <br /> Prior to sample collection, Geoprobe soil sampling equipment was thoroughly rinsed <br /> ' with clean water after being washed with a solution of Alconox. Geoprobe rods were <br /> thoroughly cleaned prior to soil probe boring advancement. <br /> ' BORING ABANDONMENT <br /> ' Following sample collection, each boring was permanently sealed to prevent vertical <br /> migration of potential contaminants. Soil borings were abandoned by backfilling with <br /> portland cement from the total depth to surface grade. <br /> Advanced GeoEnvironmental,Inc. <br />