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I LO <br /> ' Post-it® x Not 7671 D r #of <br /> TO pages <br /> Fro <br /> CoMept. <br /> ' <br /> hone# Co.CPhone# <br /> -Soil and Groundwater Investigation <br /> Fax# I• Fax# Herman&Helen's Marina <br /> lL September 30, 1996 <br /> 50"- Page-10- <br /> �i�9 hroLovAs-�R&-5r�,� g� <br /> 5.0 RECOMMENDATIONS <br /> ' Based on the data presented above, Condor recommends that three (3) monitor wells be <br /> installed at the site at locations shown in Figure 3, Appendix A. The monitor wells will be used to <br /> ' determine the groundwater gradient and flow direction and to monitor groundwater contaminant <br /> concentrations (TPH-G, BTEX, MTBE, and TF.PH). The monitor wells should be monitored <br /> ' on a quarterly basis for at least one year. <br /> ' In addition, the site should be evaluated in accordance with the Standard Guide for Risk Based <br /> Corrective Action (RBCA) ASTM E1739-95 to determine if the site warrants closure or active <br /> remediation, based on the potential threat to human health. Risk based screening levels should be <br /> reviewed and contaminant transport pathways, and exposure pathways should be assessed. The <br /> adjacent agricultural property and the river should be assessed for potential impact. Fate and transport <br /> modeling for contaminant migration within the vadose zone and the groundwater should be conducted. <br /> The results of the previous chemical analyses and geotechnical testing may be used in the fate <br /> transport modeling. Based on the results of the groundwater monitoring, fate and transport analyses <br /> and the exposure assessment, site closure will be requested, if warranted. If you need additional <br /> ' information or have any questions, please call (209) 668-9234. <br /> *Respellyitted, FE$sto <br /> Oy x0 <br /> x . -30.98 Robert J. Jo P C10-California Reg 0 <br /> ' Professional Engin <br /> #51592 <br /> ENVIRONMEN IAL HEALTH DIVISION <br /> ' 304 E. Weber Ave.Third Floor <br /> H&H:Ui&H2.RPT P O. Box 388,Stoc n CA 95201-0388 <br /> Approved <br /> Denied <br /> ' Conditions 3u 1, ylllhlYbV` 2C DIA4N <br /> RAh law <br /> Date by �7i�1l,�ID�. 0}41 <br /> 1�6U� ltxiprl�l � S�f��► I �' <br /> �� CONDOR <br />