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II <br /> Mr. Mike IrrCurna <br /> Page 2 of 3 <br /> SUNiM.A.RY AND CONCLUSIONS <br /> Only minor levels of TPHg and BTEX compounds remain in groundwater as detected in well MW2. <br /> A TPHg isoconcentration map slowing the extent of TPHg concentrations in groundwater has been <br /> included as Figure 3 and a benzene,isoconcentration map has been included as Figure 4. ln.response <br /> to email correspondence with EHD select site wells were analyzed for Cr, Cr VI and Mo. Levels of <br /> Chromium detected in wells MWI; MW4 and MW5 are below the MCL of 50 ppb and while no <br /> MCL is available for Mo, the level of Mo detected in MW 1 is below the agricultural standard of 10 <br /> ppb. The relatively minor levels of dissolved.contaminants in groundwater are confined to the <br /> subject property. <br /> RECOMMENDATIONS <br /> We recommend evaluating current site conditions (hydrogeology and current contamination levels) <br /> for the potential for vapor intrusion.into the existing site building or fixture site structures. A <br /> Workplan-to conduct a soil vapor.survey will be submitted shortly. <br /> The next round of groundwater sampling is scheduled for September 2008..EHD will be provided with <br /> at least 48.hours notice prior to condi cting.fiefdwork. <br /> If you have any questions or comments please.contact Ground Zero at your convenience. <br /> Respectfully, 5 <br /> Ground Zero Analysis,Inc. <br /> Joseph L:Vasquez, k, O <br /> c <br /> Staff Geologist <br /> o i <br /> cA <br /> 'i 4 GREGORY P. •� j <br /> BrAFtL i <br /> i <br /> reg`o^ P. Stahl,PG 5023 <br /> ' ry � <br /> CA Certified Hydrogeologist No.26.4 4TF OF C�UF4� <br /> Attachments ' <br /> cc: Mr. Ron Pestana,John Pestana QTIP,;Trust <br /> Mr. James L.L. Barton, CRWQCB <br /> Mr. John Lane, Lee&.Pierce'Tnc <br />