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Kennedy/Jenks Consultants <br /> • if soil is excavated in support of the planned redevelopment, the excavated soil <br /> However, <br /> should be preliminarily assumed to contain ele�astock les pending the collection andic analysis <br /> Any excavated soil should be placed in cover p <br /> of stockpile samples to characterize the soil for offsite disposal. <br /> Additional characterization of the lateral and vertical extent of TPH in groundwater in the vicinity <br /> of Boring G-138-OU3 in the southwestern portion of OU-3 is recommended. <br /> 7,4 Operable Unit 4 <br /> OU-4 is also expected to be redeveloped as part of <br /> a multimodal <br /> ul imodalface either pavedyor occupire ed by land use <br /> would be commercial with the majority of th <br /> structures or landscaping. Based upon the analytical results described herein, and the <br /> redevelopment plans, no further action is recommended to characterize soil within OU-4. <br /> However, if soil is excavated during redevelopment, the excavated soil should be preliminarily <br /> assumed to contain elevated concentrations of Iead, arsenic tad analyses of sampleTPH. Ay s toil <br /> should be placed in covered stockpiles pendinghe collection a <br /> characterize the soil for offsite disposal. <br /> in er in the <br /> i Additional characterization of the lateral and vertical <br /> extent <br /> to t oecommegdedn Th TPHst assessment vicinity <br /> of Boring G-B5-OU4 in the southwestern portion <br /> may include collection of additional reconnaissance samples in the northwestern portion of <br /> OU-3. <br /> 7,5 Operable Unit 5 <br /> At this time, it is anticipated that OU-5 will be redeveloped for residential s emoved injadvance <br /> there are several subsurface features (e.g., old pipelines) which should be <br /> material, coal- <br /> of, or in conjunction with, redevelopment activitie othes. ag ballast, purple <br /> frurpleom historical d land use in OU-5 <br /> like material in shallow soil in eastern O , <br /> should also be removed and separately stockpiled for characterization prior to offsite disposal. <br /> Either prior to, or in conjunction with, redevelopment activities, shallow soil containing residual <br /> lead at concentrations exceeding values developed through a risk assessment should be <br /> remediated. Collection and analysis of post-remediation soil confirmation soil samples is <br /> recommended to confirm the effectiveness of remediating lead at concentrations exceeding <br /> cleanup goals based upon the risk assessment. Because the elevated concentrations of arsenic <br /> tend to be associated with lead, it is expected that remedial measures implemented to address <br /> lead will also address arsenic in soil. <br /> Additional characterization of the extent of TPH in groundwater within and west of OU-5 is <br /> recommended. Installation and monitoring of at least three groundwater monitoring wells is <br /> recommended to characterize the groundwater gradient. Analytical parameters in future <br /> reconnaissance groundwater investigatioin of additional ldeeconnai limited tsancersampleanalysis <br /> s for totalfor X <br /> does not appear to be necessary, and analysis <br /> • metals is not recommended. <br /> Page 48 <br /> DRAFT Phase I Remedial Investigation Report <br /> Former Tracy Railyard, Tracy, California <br /> g:Us-group\admin\job\05\0565777.18_uprr\09-reports\ri rpt\lext.doc <br />