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relatively quickly when used properly. Nevertheless, it is not known if residual agricultural chemicals exist on the project site at concentrations that may pose a risk to human health. San Joaquin County Code Section 9-905.12 requires the submittal of a surface and subsurface contamination report at the time of tentative map submittal. In compliance with this section, a Phase I Environmental Site Assessment has been prepared for each of the two proposed subdivisions. Appendix E contains copies of these assessments. The Phase I Environmental Site Assessments evaluated the properties for potential "recognized environmental conditions," which are the presence or likely presence of any hazardous substances or petroleum products in, on, or at a property. The assessments also looked for potential "Business Environmental Risks," which include the presence of asbestos-containing materials, lead-based paint, mold or moisture conditions, or non- hazardous regulated materials. Neither of the Phase I Environmental Site Assessments identified any recognized environmental conditions or Business Environmental Risks on the properties evaluated. For both properties, the only potential environmental issue identified was the potential for residual pesticides in the soil due to the agricultural use of the properties up to the early 2000s (AdvancedGeo 2020, 2021). In general, no contamination has been identified on the project site except for potential residual pesticide contamination of soils. Mitigation described below, based on a recommendation of the Phase I Environmental Site Assessments, would ensure that any residual agricultural chemicals that could pose a risk to human health would be identified and remediated. Implementation of mitigation would reduce project impacts related to hazardous material sites to a level that would be less than significant. Level of Significance: Potentially significant Mitigation Measures: HA7--1: Prior to the start of project construction, the developer shall conduct a limited sampling of the surface soil of the project site to determine the presence of residual pesticides, including but not limited to organochlorines. The samples shall be analyzed using California Department of Toxic Substances Control (DTSC) screening levels established for residential projects in Human Health Risk Assessment (HHRA) Note Number 3: DTSC-Modified Screening Levels, June 2020, or by U.S. Environmental Protection Agency Regional Screening Levels if screening levels are not established in HHRA Note Number 3. If no pesticide contamination is found or does not exceed applicable screening levels, then no further action need be taken. If pesticide contamination is identified and found to exceed the applicable screening level, then a Phase II Environmental Site Assessment shall be conducted for the property/properties on which this contamination was identified. The Phase Il Environmental Site Assessment shall identify the extent of the contamination and shall recommend measures to remediate soil contamination to below Pock Lane Public Review Draft IS/MND 3-41 May 2022