Laserfiche WebLink
{ <br /> 1 U <br /> 3555 West Hammer Lane <br /> Page 2 of 2 <br /> While not necessarily showing all data in diagrams and drawings, an adequate SCM can be utilized to <br /> account for most of the known data and to evaluate the fate of impacted groundwater with an estimate <br /> of when background conditions will be restored. All analytical data, including soil groundwater results <br /> for B-1 through B-5, MW-1/MW-IR through MW-10,ATC-1 through ATC-6, SBI through SB-3, and <br /> SHP-1 through SHP-6, should be included in tables. Residual contaminant concentrations should be <br /> compared to Environmental Screening Levels (ESL) and California Human HealIth Screening Levels <br /> (CHHSLs) established by Califomia Environmental Protection Agency San Fraricisco Bay Regional <br /> Water Quality Control Board. Also, the potential for vapor intrusion should be evaluated for on- and <br /> off-site structions. Methods and calculations of contaminant masses should be ii eluded in the SCM, <br /> and may be submitted as an appendix. The SCM should be updated each time new data are acquired <br /> that cause a change of interpretation or expands the model until model modifications are not needed to <br /> explain subsequently acquired data. As the SCM becomes complete, it can be utilized to reasonably <br /> predict additional investigation results and plume response to various remedial1technologies or to <br /> changes in groundwater flow regime. The model should adequately demonstrate all interpretations and <br /> opinions. For example, the source area and the area in the inferred down-gradienttdirectron should be <br /> where the vertical delineation of the dissolved plume is established. <br /> Please submit an SCM to EHD by August 31, 2006. If you have any questions regarding this letter, <br /> please contact Vicki McCartney at(209)468-3456 or by electronic mail at vmccartnev cr sicehd.com. . <br /> Donna Heran,REHS,Director <br /> EnvironmentalHealth Department <br /> X / <br /> `Z/ U./iU✓/2�® ✓� • //G�i iGi�I c.ELG�/.l!�/t�- <br /> Victoria L.McCartney, Senior REHS Nuel C.Henderson,Jr.,PG <br /> Unit N-Site Mitigation •Unit IV-Site Mitigation <br /> c: Janine Weber,PhD, CEG-ATC <br /> James L.L. Barton,PG-CVRWQCB <br /> i <br /> i <br /> h <br /> h <br /> f <br /> ! <br />