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08 May 2024 AdvancedGeo <br /> Project No. 23-7523 An Employee-Owned Company <br /> Page 2 of 3 <br /> 2.3. SOIL VAPOR EXTRACTION WELL INSTALLATION <br /> Following pilot boring advancement, AGI proposes to install a total of eight (8) SVE wells <br /> with the following construction: <br /> • Four (4) wells will be installed in the interior of the 308 North Ham Lane to total <br /> depths of 15 feet bsg and screened from 3 to 15 feet bsg. <br /> • Two (2) wells will be installed to 20 feet bsg in the rear exterior parking area of the <br /> subject property to 20 feet bsg and screened from 5 to 20 feet. <br /> • Two (2) wells will be installed to 30 feet bsg in the rear exterior of the building and <br /> will be screened from 10 to 30 feet bsg. <br /> SVE well installation procedures are described in detail in Section 3.2. The proposed soil- <br /> vapor well locations are illustrated in Figures 1. <br /> 3.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGI representative under the supervision of a <br /> California Professional Geologist. Procedures for the advancement of pilot borings, SVE <br /> well completions, and equipment decontamination are outlined below. <br /> 3.1. SOIL BORING ADVANCEMENT <br /> Proposed borings for SVE well installations will be advanced to depths ranging between <br /> 15 and 30 feet bsg using a 6-inch diameter hand auger or a direct push drilling rig <br /> equipped with 8.25-inch diameter hollow-stem augers. <br /> Soil encountered in the borings will be visually classified by an AGI staff member in <br /> accordance with the Unified Soil Classification System (USCS). Additionally, soil samples <br /> will be field-screened for the presence of volatile organic compounds using an organic <br /> vapor meter (OVM) equipped with a photo-ionization detector (PID). Soil sample <br /> descriptions and OVM readings will be recorded on a log for each boring. <br /> 3.2. SVE WELL COMPLETION <br /> Soil borings will be single-completed as SVE wells utilizing 2-inch diameter schedule 40 <br /> polyvinylchloride (PVC) 0.020-inch slotted well screen and blank well casing. Well <br /> screens will be placed from 3 feet to 15 feet bsg; 5 feet to 20 feet; and from 10 feet to <br /> 30 feet bsg. <br /> After installing the well casings, a filter pack material consisting of pre-washed #3 sand <br /> will be added through the augers to approximately one to two feet above the screened <br />