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28 March 2018 <br /> AGE Project No. 18-4333 <br /> Page 3 of 4 <br /> boring, collection and analysis of soil samples, equipment decontamination and sample <br /> handling are presented below. <br /> 3.1 . SOIL BORING ADVANCEMENT <br /> A total of five (5) soil borings will be advanced using a truck-mounted probe or van- <br /> mounted Geoprobe® 5400 equipped with 1.25-inch probing rods. The probe rig will <br /> advance soil borings using a hydraulic hammer to drive sampling tools to specified <br /> depths. <br /> 3.1.1. Soil Sampling <br /> Beginning at 5 feet bsg, soil samples will be collected from the five probe borings at 5- <br /> foot intervals using a 1 .45-inch diameter Geoprobe soil sampling assembly preloaded <br /> with one two-foot long acetate sleeve. After sample collection, a portion of the acetate <br /> sleeve will be separated, and the ends preserved by covering with Teflon sheets, rubber <br /> end caps and sealing with duct tape. <br /> Soil samples will be visually classified by an AGE geologist in accordance with the <br /> Unified Soil Classification System (USCS). Additionally, soil samples will be field <br /> screened for the presence of volatile organic compounds using an organic vapor meter <br /> (OVM), equipped with a photo-ionization detector (PID). Soil sample descriptions and <br /> OVM readings will be recorded on a log for each boring. <br /> Following sample collection, each preserved sample sleeve will be labeled with the <br /> boring location, depth, time, date, and sampler's initials. Appropriately sealed and <br /> labeled samples will be placed in a chilled container and transported under chain of <br /> custody to a CDPH-certified laboratory for analysis for the constituents listed in Section <br /> 2.3. <br /> 3.1.2. Boring Abandonment <br /> All soil borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. The soil boring will be abandoned by backfilling with Portland type II <br /> cement grout from the total depth to surface grade utilizing tremie procedures. The top <br /> three to six inches of the boring abandonments will be completed flush to surface grade <br /> with concrete. The EHD will be notified for grout inspection at least 72 hours prior to <br /> conducting grouting procedures. <br /> Advaacec/CcoEiivironmcnfAl,Inc. <br />