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Groundwater Well Installation Work Plan Sharpe Army Depot <br /> Lathrop, California <br />Ahtna Environmental, Inc. 14 <br />fieldwork, maps will be prepared to show surveyed locations and elevations, along with physical site <br />features, to confirm they are located correctly. <br />3.2.7 Sampling <br />The newly installed wells will be added to the existing sampling well network and sampled no sooner than <br />two days after well development is complete. The sampling frequency is based on the decision rules <br />shown in the Well Sampling Frequency Decision Logic (Figure 16). Fieldwork will follow the guidelines, <br />standards, and procedures documented in the QAPP (Ahtna, 2019d), APP (Ahtna, 2019e), Site Waste <br />Management Plan (SWMP; Ahtna, 2019f), applicable SOPs (Appendix B) and this Work Plan. Field quality <br />control (QC) samples will be used to assess the influence of sampling procedures, equipment, and <br />handling on the reported results. <br />Discrete soil samples will be collected 5 ft above, 5 ft below, and at 5 ft intervals within the anticipated <br />screen interval for each well, for lithologic description only. Soil samples will be logged in the field by a <br />qualified geologist and in accordance with the USCS. <br />3.3 Waste Management <br />Solid and liquid investigation derived waste (IDW) will be produced during the well installation activities <br />and will be managed following the SWMP (Ahtna, 2019f). <br />Soil IDW will be contained in labeled drums or bins adjacent to the well locations and then transferred to <br />the Central Area GWTP. Soil IDW will be sampled and characterized to determine appropriate disposal in <br />accordance with applicable laws and regulations, and an appropriate disposal facility will be identified <br />following characterization. Soil generated during trenching will be stockpiled on the ground next to the <br />trench. The excavated soil will be used to the extent practical to refill the trenches and meet minimum <br />compaction specifications. The trenching will be through areas not identified as soil contaminant areas; <br />therefore, soil stockpiled next to the trenches will be on the bare ground. Piles will be covered with 20- <br />mil (0.02 inches, or thicker) polyethylene plastic sheeting to minimize airborne dust until construction <br />activities are complete. Soil generated and not used as backfill will be contained, profiled, and disposed <br />of as described above. Material stockpiling and excess material loading into bins will be performed in such <br />a way as to prevent damage to the finished grade surrounding the stockpile. Excess soil that does not <br />require offsite disposal will be transported to the soil spreading area west of the Central Area percolation <br />ponds. <br />Liquid IDW will be contained in labeled drums or tanks and, whenever possible, will be disposed of at the <br />South Balloon GWTP. The presence of solids in liquid IDW generated during drilling and well development <br />activities may prevent disposal at the South Balloon GWTP. As required for offsite disposal, liquid IDW will <br />be sampled and characterized to determine appropriate disposal in accordance with applicable laws and <br />regulations. An appropriate disposal facility will be identified following characterization. <br />Solid non-hazardous waste (e.g., disposable personal protective equipment and sampling equipment) will <br />be wiped of any visible contamination and disposed of in a municipal waste receptacle. Ahtna will <br />coordinate with the Presidio of Monterey DPW-E, for the signature of required waste manifests. A copy <br />of the signed manifests will be provided to the DPW-E.