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31 August 2018 AdvancedGeo <br /> AGE Project No. 14-3002 l rivironmental <br /> Page 5 of 7 n 0 <br /> Laboratory reports for analyses, testing methods and laboratory quality assurance/quality <br /> control (QA/QC), and sample chain of custody documentation will be presented in a report <br /> with findings and recommendations. <br /> 3.4. MONITORING WELL INSTALLATION <br /> AGE proposes to install four (4) groundwater monitoring wells at the site. Initially, <br /> monitoring wells will be installed to evaluate groundwater flow direction and gradient at <br /> the site. If determined to be necessary for site assessment or contaminant plume <br /> definition, groundwater samples will be collected from the monitoring wells and analyzed <br /> for the appropriate constituent(s). Groundwater samples will only be collected at the <br /> direction of the CVRWQCB. The proposed groundwater monitoring well locations are <br /> depicted in Figure 2. However, well locations should not be finalized or installed until the <br /> initial site investigation work is completed and evaluated. Following the initial site <br /> investigation, monitoring wells should be installed in locations that contribute to the <br /> assessment of the site, if necessary. <br /> 3.4.1 . Pilot Boring Advancement and Sampling <br /> For the installation of monitoring wells, four (4) pilot soil borings will be advanced at the <br /> site to maximum depths of 20 feet bsg. Borings will be advanced utilizing a track- or truck- <br /> mounted hollow-stem drill rig equipped with 8.25-inch diameter hollow-stem augers. The <br /> total depth of each well boring may vary according to geologic/hydrogeologic conditions <br /> encountered during drilling. If necessary, relatively undisturbed soil samples will be <br /> collected from the borings at five-foot intervals beginning at 5 feet bsg using a California <br /> modified split-spoon sampler fitted with 2-inch diameter stainless steel sleeves. Upon <br /> removal from the sampler, sample sleeves will be separated, and the exposed ends of a <br /> selected sleeve will be covered with Teflon sheets, capped and sealed with tape. <br /> If soil samples are collected during well installation activities, soil encountered in the <br /> borings will be visually classified by an AGE staff member in accordance with the USCS. <br /> Additionally, soil samples will be field-screened for the presence of VOCs using an OVM. <br /> Soil descriptions and OVM readings will be recorded on a log for each boring. Following <br /> sample collection, each preserved sample sleeve will be labeled with the boring location, <br /> depth, time, date and sampler's initials. Appropriately sealed and labeled samples will be <br /> placed in a chilled container with ice and transported under chain-of-custody procedure <br /> to an ELAP-certified laboratory for analysis for the appropriate constituent(s) listed in <br /> Section 3.3, if necessary. The proposed well locations are illustrated in Figures 2. <br />