Laserfiche WebLink
r- recommends that the Department of General Services seek approval to backli ,re <br /> excavations leaving the limited amount of heavier hydrocarbons in-place. Benzene and the <br /> lighter, mobile petroleum hydrocarbons were not detected. The mobility of the heavier <br /> petroleum hydrocarbons is low, and the relatively low concentrations detected will degrr;de <br /> naturally over time. <br /> The love mobility of heavier hydrocarbons resuhs in no significant risk to human health and <br /> the environment. However, only detailed environmental fate modeling could quantify the. <br /> risk and fully justify no further action. In our judgment, and based on the current land use, <br /> no further action is required at this time. We recommend capping the excavations with <br /> b compacted soil and asphalt as a precaution and general safety,neasure. <br /> r, <br /> w The final decision on further action may be regulatory and economic decision rather than a <br /> {I <br /> technical decision. Regulatory review,and changing land use may dictate soil remediation. <br /> In this case, soil excavation and offsite disposal at a local site permitted to accept soil with <br /> f <br /> below hazardous levels of petroleum hydrocarbons may be required. <br /> fy <br /> A copy of this report should be submitted to the San Joaquin County Public Health <br /> s Services,Environmental Health Division for their review and consideration. Public Health <br /> Services approval should be obtained prior to initiating the recommendations presented in <br /> �„ this report. <br /> a.. <br /> 241-59-2196 8 <br />