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8200 Hkvy 99 <br /> Speedy Food Mart <br /> June 16, 2004 <br /> Page 3 <br /> RWQCB and EHD confirmed in a site inspection on June 16, 2004 that the air stripper at <br /> the site is currently not in operation. In a telephone conversation on June 17, 2004, <br /> Groundzero informed EHD that the air stripper is not in operation because incorrect parts I <br /> were delivered to them. Groundzero is currently waiting for the delivery of correct parts <br /> from the manufacturer. EHD requests that all efforts be made to replace the incorrect parts <br /> as soon as possible. EHD directs that the air stripper be brought into operation by July 10, <br /> 2004. <br /> Please include cross-sections and graphic representations of the iso-contour of the <br /> contamination plume in all future reports of findings. EHD has listed below the <br /> components generally used in a site conceptual model (SCM). Simply stated, the purposes <br /> for an SCM are to demonstrate where the contaminants came from, where they are at the <br /> present time, how they move through the subsurface,how they will respond to changes in <br /> the ground water flow characteristics or to potential remediation efforts,what the <br /> contaminants' ultimate environmental fate will be,and to help evaluate the risk posed by the <br /> contaminants to ground water supplies and sensitive receptors. The components of an <br /> effective SCAM commonly include: <br /> • Local and regional plan view maps with sources,boring and monitoring well <br /> locations, lines of cross section, extent of contaminants in each media, detection and <br /> rate of ground water flow, and receptor locations,including water supply wells <br /> within 2,000 feet of the site. <br /> + Cross sections showing subsurface geological features, depth to ground water, man- <br /> made conduits, monitoring well construction and an interpretative drawing of the <br /> vertical extent of soil and groundwater contamination. <br /> • Cross-plots of key chemical concentrations vs. time for representative wells that <br /> demonstrate significant contaminant concentration trends. <br /> • Summary tables of contaminant concentrations in the different media. <br /> • Well and boring logs. <br /> A narrative description of the SCM that describes controls on contaminant <br /> distribution; contaminant migration mechanisms,pathways and rates;plume <br /> disposition over time; and sorbed and dissolved contaminant masses. j <br /> While not necessarily showing all data in diagrams and drawings, an adequate SCIVI can be <br /> utilized to account for most of the known data and to illustrate additional assessment needs. <br /> All analytical data should be included in tables. Methods and calculations of contaminant <br /> masses should be included in the SCM, and may be submitted as an appendix. The site <br /> conceptual model should be updated each time new data is acquired that causes a change of <br /> interpretation or e=xpands the model until model modifications are not needed to explain <br /> becomes complete,subsequently acquired data. As the SCM bee p ,it can be utilized to reasonably <br /> predict additional investigation results and plume response to various remedial technologies <br /> I, <br />