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Sampling Plan - 5 - 25 March 2022 <br /> Stockton Propeller, Inc. <br /> 2478 Wilcox Road, Stockton <br /> Recommended Action: Central Valley Water Board staff recommend a certified <br /> professional record and log the borehole soils using the United Soil Classification <br /> System (USCS). Central Valley Water board staff also recommend the utilization of a <br /> PID for both protection of human health and to indicate whether VOCs are present in <br /> soils at the Site. Please present the boring logs with PID results in a SI Report (see <br /> Comment 16). <br /> COMMENT 4 <br /> Issue: The SAP does not propose to do a utility location survey before intrusive work is <br /> conducted nor does the SAP propose to notify the Underground Service Alert at least <br /> 48-hours prior to the start of fieldwork. <br /> Requested Action: Revise the SAP to include a discussion on the utility location <br /> activities that will be conducted prior to any intrusive work. At a minimum, SPI should <br /> notify the Underground Service Alert at least 48-hours prior to the start of fieldwork. <br /> COMMENT 5 <br /> Issue: The SAP has been revised twice to include updated information, particularly <br /> information regarding the locations of the property's septic tanks and whether SPI's <br /> septic tanks is shared with another business. In a meeting between the Property <br /> Owners and SPI, the Property Owners clarified SPI's septic tank is not shared by any <br /> other building on the property. The Property Owners also provided a map showing the <br /> location of all the property's septic tanks (see map in Attachment A of the SAP). <br /> However, Section 1.2, Operations, still states SPI's septic tank is shared by other <br /> businesses and residences near the Site. <br /> Requested Action: Revise the SAP to remove statements that SPI's septic tank is <br /> shared. Alternatively, SPI may provide additional information that states otherwise. <br /> COMMENT 6 <br /> Issue: Section 1.2, Operations, lists several chemicals used on-Site. However, the list <br /> neglects to include DeSmut NS3 as a chemical used by SPI. DeSmut NS3 is a mixture <br /> of nitric and sulfuric acids (strong acids). SPI uses DeSmut NS3 after the etching <br /> process. The plane propellers are dipped in the solution and then dipped into <br /> wastewater that was reported to have been disposed into the on-Site septic tank. <br /> Requested Action: Revise the SAP to include a full list of chemicals used by SPI. <br /> COMMENT 7 <br /> Issue: Section 2.1, Previous Investigations, states SPI has not been identified as a site <br /> requiring cleanup on GeoTracker. This statement is no longer correct. SPI is identified <br /> as an "Open Site" requiring "Site Assessment" on GeoTracker. The GeoTracker page <br />