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22 November 2023 AdvancedGeo <br /> Project No. 23-7523 An Employee-Owned Company <br /> Page 2 of 7 � <br /> 2.0. PROCEDURES <br /> Prior to conducting the subsurface investigation, the work area was marked with white <br /> paint and Dig Alert - North was subsequently notified for the marking of subsurface utility <br /> lines (Dig Alert Ticket No. 2023102500993-000). <br /> 2.1. SOIL SAMPLING PROCEDURES <br /> On 30 October 2023, six (6) soil borings (V1 through V6)were advanced to 15 feet below <br /> surface grade (bsg) for collection of soil samples. Borings V1, V4, V5 and V6 were <br /> advanced on the exterior of the building using a GeoProbe 5400 direct-push drilling rig <br /> equipped with a 2-inch diameter macro core and 1.5-inch probing rods. Two additional <br /> borings were advanced within the rear of Suite 308A using a three-inch hand auger. <br /> Initially, borings were advanced to five feet bsg using a hand auger. During hand clearing, <br /> soil samples were collected at depths of 2 and 5 feet bsg by hand-packing into a six-inch <br /> sections of acetate liners. Upon collection, the ends of each liner were covered with Teflon <br /> sheets, capped, and sealed with tape. Each sample liner was labeled with soil boring <br /> location, depth, time, date, and sampler's initials and then placed in a chilled container. <br /> Borings advanced on the exterior of the building were advanced utilizing a 2-inch diameter <br /> Geoprobe macro core soil sampling assembly loaded with a four-foot acetate liner. A <br /> 6-inch section of each acetate liner was cut and prepped for laboratory analysis by <br /> covering the ends of each sample liner with Teflon sheets, plastic end caps, and sealing <br /> with tape. Each sample liner was labeled with soil boring location, depth, time, date, and <br /> sampler's initials and then placed in a chilled container. <br /> For the two borings advanced on the interior of the 308 North Ham Lane suite, samples <br /> were hand packed at depths of 10 and 15 feet bsg following the procedures described <br /> above. <br /> Soil samples were transported under chain-of-custody to McCampbell Analytical, <br /> Inc. (MAI) a California Environmental Laboratory Accreditation Program (ELAP)-certified <br /> laboratory. Selected soil samples were analyzed for Volatile Organic Compounds (VOCs) <br /> in accordance with EPA Method 8260B. <br /> 2.2. SOIL-VAPOR POINT INSTALLATION AND SAMPLING <br /> Borings V1 , V4, V5 and V6 were converted to triple completed soil-vapor points (V1 A-C, <br /> V4A-C, V5A-C and V6A-C). On 31 October 2023, borings V2 and V3 were converted into <br /> triple completed soil-vapor sampling wells (V2A-C and V3A-C; Figure 1). <br /> For the installation of the triple completed soil-vapor points (V1A-C through V6A-C), <br /> approximately three (3) inches of #2/12 sand was placed at the bottom of the borehole, <br />