Laserfiche WebLink
J ! <br /> 9 <br /> 1 <br /> Criterion 3: Petroleum hydrocarbons remaining in the vadose zone do not impa,:t or } <br /> threaten waters of the State. <br /> As explained under criterion 1, it is unlikely that groundwater has been or will becom( <br /> impacted because the soil is silty and there is at least a. 15-foot buffer zone of clean sod l <br /> between the high groundwater level and the residual hydrocarbons. <br /> Criterion 4: No significant risk to human health and safety exists or is anticipate d <br /> following remediation: <br /> A sensitive receptor survey has been performed, and the nearest potential receptor is <br /> ST&E's own well, which is more than 300 feet from the UST location_ The SME <br /> locomotive shop parcel is several acres in size, and is surrounded on all sides by even . <br /> larger industrial properties and the ST&E freight yard. The area is not zoned for <br /> residential use, and the risk of public exposure is very low. Upgradient Environmental <br /> therefore concludes that'the residual diesel contamination within the UST excavation <br /> poses no significant threat to public health.. <br /> Based on our investigation and our conclusion that the site meets the Appendix B <br /> conditions for case closure with residual contamination left in place, we recommend tl.at <br /> PHS/EHD forward the case to the Central Valley Regional Water Quality Control Bo trd <br /> for closure. Additionally, we recommend that the drill cuttings that are currently store i on <br /> site be used for fill material or spread out and leveled. <br /> 9 <br /> 4 <br />