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SAP/QAPP Addendum <br /> Lodi-125 N Stockton <br /> Final <br /> March 24,2025 <br /> Equipment Fabrication Dedicated <br /> Pump Calibration Device Pump Calibration Device Pump Calibration Device <br /> Tubing Tubing Tubing <br /> Swagelok"T" Swagelok"T" Swagelok"T" <br /> Hand auger Hand Auger Hand Auger <br /> Flow Regulator Flow Regulator Flow Regulator <br /> Hazardous Building Materials Survey <br /> Tyvek®Coveralls Tyvek® Yes <br /> Respirator NA NA <br /> Air Filter Cartridges NA NA <br /> Whirl-Pak®Bags Plastic Yes <br /> Spray Bottles Plastic NA <br /> Wipes NA NA <br /> Silicone Caulk/Sealant NA NA <br /> Tools (for Chipping Paint/Material) Metal No <br /> Notes: <br /> GPS Global Positioning System <br /> NA Not applicable <br /> PID Photoionization detector <br /> 6.3 Geophysical Survey <br /> A geophysical survey will be performed to assess the presence of a UST or backfill materials consistent with a <br /> former UST excavation within an area approximately 10 feet by 10 feet.The geophysical survey will be <br /> performed using a Geonics EM61 MK2 time-domain metal detector and a GSSI SIR4000 GPR with a 350- <br /> megaHertz transducer antenna.The purpose of the EM61 survey will be to detect and map possible USTs, <br /> vaults, sumps,metallic underground lines,and buried metal within the survey area.The purpose of the GPR <br /> survey will be to detect and map possible former backfilled excavations,and buried pipelines and utility lines. <br /> The EM61 data will be conducted along transects nominally spaced 2 feet apart across the survey area. GPR <br /> transects will also be conducted along transects nominally spaced 2 feet apart and over detected EM61 <br /> anomalies of interest.The recorded EM61 data will be downloaded to a portable computer in the field for <br /> preliminary analysis and quality control review in the field. EM61 data will be processed and gridded using <br /> Geosoft Oasis montaj software. Seequent Oasis montaj software will be used for overlaying and comparing <br /> EM61 and GPR data,mapping interpretations of anomalous features,and creation of final maps.In addition, <br /> detectable underground utilities and pertinent surface features will be mapped using differential global <br /> positioning system (DGPS).The geophysical survey area is shown on Figure 3. <br /> 49 <br />