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San Joaquin County Environmental Health Department Permit Application <br /> January 15, 2026 <br /> Page 2 <br /> Groundwater Sampling via Direct Push <br /> Geosyntec will collect three (3) grab groundwater samples from the uppermost groundwater zone <br /> (i.e., first encountered groundwater below the Site, which is anticipated between 6 to 15 feet bgs) <br /> to provide a snap-shot evaluation of local groundwater conditions. Three of the eight borings will <br /> be drilled by a C57-licensed drilling contractor using a Geoprobe direct push technology (DPT) <br /> rig for the remaining depth of 25 feet bgs. Non-dedicated sampling equipment will be <br /> decontaminated with distilled water and Alconox prior to sampling. <br /> At each groundwater sampling location, a temporary PVC casing and screen will be installed to <br /> sample groundwater. Groundwater samples will be collected with a dedicated disposable bailer or <br /> peristaltic pump. Groundwater samples will be collected directly into the appropriate laboratory- <br /> supplied sample containers from the bailer or tubing. Groundwater samples will be analyzed by a <br /> Cal-ELAP certified laboratory. Following the collection of groundwater samples, boreholes will <br /> be abandoned, as described further below. <br /> Boring Destruction <br /> Upon completion of sampling, Cascade Drilling will abandon the temporary soil borings in <br /> accordance with the San Joaquin County well standards. Soil and grab groundwater sample borings <br /> will be backfilled with neat cement grout,which will be tremmied in place,to one foot from grade, <br /> and patched to match surrounding grade. <br /> 2. HEALTH AND SAFETY <br /> Geosyntec has prepared a task hazard analysis(THA) for the investigation scope of work. Prior to <br /> the start of field activities each day, Geosyntec will conduct a safety tailgate meeting that includes <br /> a discussion of work to be performed each day, safe work practices, identification of potential <br /> hazards,use of personal protective equipment(PPE), and emergency response protocols. <br /> 3. INVESTIGATION-DERIVED WASTE <br /> Excess soil cuttings, groundwater, and decontamination water will be considered investigation <br /> derived waste (IDW). IDW will be stored temporarily in California Department of Transportation <br /> (DOT) 55-gallon drums on-site to await characterization and subsequent off-site disposal. The <br /> IDW will be disposed of in accordance with state and federal regulations. <br /> engineers I scientists I innovators <br />