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Natalie Amos <br />November 25, 2025 <br />Page 2 <br />further analysis are dichloro-diphenyl-trichloroethane, toxaphene, and dieldrin. <br />Additionally, any level of arsenic present would require further analysis and <br />sampling and must meet approved local area baselines or thresholds. If they <br />do not, remedial action must take place to mitigate them below those <br />thresholds. Additional COCs may be found in mixing/loading/storage areas, <br />drainage ditches, farmhouses, or any other outbuildings and should be <br />sampled and analyzed. If smudge pots had been routinely utilized, additional <br />sampling for Polycyclic Aromatic Hydrocarbons and/or Total Petroleum <br />Hydrocarbons may be required. These recommendations should be adhered <br />to and become part of the environmental document. Please refer to the <br />DTSC’s Human and Ecological Risk Office (HERO) webpage for the most <br />recent guidance and screening levels. <br />2. DTSC recommends all imported soil/fill material be tested to ensure all COCs <br />meet screening levels as outlined in DTSC's Preliminary Endangerment <br />Assessment Guidance Manual. Furthermore, DTSC advises referencing the <br />DTSC Information Advisory Clean Imported Fill Material Fact Sheet if importing <br />fill is necessary. To minimize the possibility of introducing contaminated soil/fill <br />material there should be documentation of the origins of the soil/fill material <br />and, if applicable, sampling be conducted to ensure that the imported soil/fill <br />material are suitable for the intended land use. The soil sampling should <br />include analysis based on the source of the soil/fill and knowledge of prior land <br />use. <br />3. The City of Pleasanton should consider soil testing as mentioned in comment <br />#1. If, in the event any COC results are above DTSC residential screening <br />levels, DTSC recommends the City of Pleasanton address the contaminations <br />within the Project area through an Environmental Site Assessment and/or <br />receive oversight from a self-certified local agency, DTSC or Regional Water <br />Quality Control Board. If entering into one of DTSC’s voluntary agreements, <br />please note that DTSC uses a single standard Request for Lead Agency <br />Oversight Application for all agreement types. Please apply for DTSC <br />DTSC 2 <br />Page 3 of 5 <br />2 <br />CONT <br />3 <br />4 <br />   <br /><br /> <br /> <br />