Laserfiche WebLink
V <br /> I <br /> scan ec <br /> August 15,2013 <br /> Page 8 of 8, <br /> SUMMARY AND:.CONCLUSIONS <br /> Based`on historic soil and groundwater'data collected at the site:since`the UST'removal in July <br /> 1998,the site is eligible for caseclosure as detailed in the LTCP <br /> • The dissolved TPHg plume is stable and defined, and meets the characteristics'set in <br /> the LTCP. In addition, decay,rate calculations indicate that,co-ncentration's Will be below <br /> water quality objectives in approximately 20 years. <br /> • Exposure to petroleum vapors in indoor air will not pose unacceptable health risks, <br /> based on the absence of dissolved benzene in the groundwater-and the presence of the <br /> bioattenuation zone with low TPH concentrations. <br /> • Direct.contact with impacted soil and inhalation of petroleum hydrocarbon vapors pose a <br /> low threat to.human health, based on fhe thresholds listed in the LTCP. <br /> Should you have any questions .regarding this site; please contact the undersigned :at <br /> .(916) 8611=0400. <br /> Sincerely, <br /> Stantec.Consulting Services Inc. <br /> Prepared by: Reviewed by; <br /> .SS�pNAL GFO�o <br /> ._ ,. . , <br /> Amanda Mag e, AMANDA ar ielle Manning <br /> MAGES - <br /> Associate Geolo is • ' Associate Scientist <br /> No.8808 <br /> �►,,;, c �r as-i ` Project Manager <br /> OF C <br /> Attachments: <br /> Figures <br /> Tables <br /> Attachment A— SWRCB Low-Threat Closure Checklist <br /> Attachment B Decay Rate Calculations <br /> C. Mr. James Barton, California Regional Water Quality COritr0l Board—CVR <br /> Mr. John Wainwright, Stantec;308 East 4500 South,Suite 100,.Murray, Utah 84107-3957 <br /> 1\US 1345-F031workgroup\18571active\7-: <br /> Elevenlactive\185750063_711_1:4117\05_report=.deliylreports114117_2013_08. 15_closure �epoit.doc <br /> l <br />