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28 March 2019 <br /> AdvancedGeo <br />AGE Project No. 19-4669 <br /> Environmental <br />Page 3 of 4 <br />recommendations and maps will be included in the report. The report will be reviewed <br />and signed by a California Professional Geologist. <br />4.0. FIELD PROCEDURES <br />All field procedures will be overseen by an AGE representative under the supervision of <br />a California Professional Geologist. Procedures for the advancement of the soil borings <br />and sampling are outlined below. <br />4.1. SOIL BORING ADVANCEMENT AND SOIL SAMPLING <br />Soil borings will be advanced using a van mounted Geoprobe 5400 direct-push probing <br />unit equipped with 1.25-inch probing rods. The Geoprobe advances soil probe borings <br />using a hydraulic hammer to drive soil and groundwater sampling tools to specified <br />depths. <br />Soil samples will be collected for laboratory analysis from all four proposed borings during <br />the investigation. Soil samples will be collected at discrete five-foot intervals beginning at <br />five (5) feet bsg and ending at 20 feet bsg using a 1.25-inch Geoprobe soil sampling <br />assembly loaded with a two-foot acetate liner (on 108 East Eleventh Street parcel); soil <br />samples will be collected from the two borings surrounding the clarifier at depths of 5, 10 <br />and 12 feet bsg. <br />For sample collection, a selected portion of the liner will be cut and covered with Teflon <br />sheets, capped and sealed with tape. Appropriately sealed and labeled samples will be <br />placed in a chilled container under ice and transported under chain-of-custody procedure <br />to a CELAP-certified laboratory. Samples will be analyzed for the constituents listed in <br />Section 2.2. Each sample will be labeled with boring designation, depth, time, date and <br />sampler's initials. Soils encountered in the borings will be visually classified by AGE <br />personnel in accordance with the Unified Soil Classification System (USCS). Additionally, <br />soil samples will be field-screened for presence of volatile organic compounds using an <br />organic vapor meter (OVM), equipped with photo-ionization detector (PID) pre-calibrated <br />to isobutylene. <br />4.2. GRAB GROUNDWATER SAMPLING <br />For collection of grab groundwater samples, soil borings will be advanced to the top of <br />the groundwater table as identified by collection of a saturated soil sample. Once <br />groundwater has been encountered, a Geoprobe (or similar) push-driven water sampling <br />device will be advanced four feet into the water-bearing zone. Grab groundwater samples <br />will be collected using a Geoprobe water sampling assembly fitted with a pre-cleaned, <br />one-inch diameter 0.01-slotted temporary well screen. Each groundwater sample will be