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Sampling Plan -4 - 25 March 2022 Stockton Propeller, Inc. 2478 Wilcox Road, Stockton bioassay, trihalomethanes, and VOCs by an ELAP accredited laboratory, using industry standard methods, such as the USEPA methods. The SAP should include details regarding where and how the samples will be collected. Central Valley Water Board staff recommend the samples ideally be collected near the influent, effluent, and in the effluent screen. The samples near the influent and effluent should be collected from the liquid waste and avoid sampling the sludge and scum. The SAP should provide details regarding the safety precautions that will be taken, including the required personal protective equipment that will be worn by qualified environmental consultants when sampling the septic tank. Once the septic tank is sampled, the septic tank can be pumped by a certified waste hauler under hazardous waste manifest. As previously mentioned, the contents of the septic tank should be treated as hazardous waste and disposed of properly until laboratory analysis indicates otherwise. Once the septic tank is emptied of the contents, please evaluate the condition of the septic tank by taking photos of the walls and floor to identify any damaged or compromised areas. The results of the laboratory samples and photos of the septic tank should be reported in a Site Investigation Report (SI Report; see Comment 16) and uploaded to the Site's https://geotracker.waterboards.ca.gov/profile report.asp?global id=T10000017618. Comments regarding the soil investigation surrounding the septic tank are discussed in Comment 11. COMMENT 2 Issue: The SAP offers no indication that it was prepared by a licensed professional or their subordinate and was not signed by the licensed professional. In accordance with the Business and Professions Code sections 6735, 6835 and 7835.1, work plans and technical or implementation reports containing geologic or engineering evaluations and/or judgments shall be performed under the direction of an appropriately licensed or certified professional. Required Action: Please ensure that all documents that contain site-specific data, data interpretations, or recommendations comply with this requirement and that they include the professional license stamp, signature, and statement of professional certification (i.e., California Professional Geologist or California Professional Engineer). Please resubmit the SAP to incorporate this requirement. COMMENT 3 Issue: The SAP does not propose to record and log the borehole soils by a certified professional (i.e., California Professional Geologist or California Professional Engineer). The SAP also does not reference the use of a photoionization detector (PID) during borehole activities. The use of a PID could provide insight to potential volatile organic compound (VOC) impacts as well as serve as an additional safety measure for field staff.