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0 <br /> Stephen G. Muir <br /> Consulting Geologist& Geophysicist <br /> PO Box 152,Woodbridge, California 95258-0152 <br /> (209) 369-9421 FAX(209)369-9358 <br /> e-mail: stevemuir@sbcglobal.net <br /> August 25, 2010 <br /> Mr. Nuel Henderson <br /> San Joaquin County Public Health Services Environmental Health Department <br /> 304 East Weber Avenue, 3' Floor <br /> Stockton, California 95202-2708 <br /> Re: Workplan Amendment for Soil Vapor Extraction Test(SVET) <br /> Gillies Trucking Site, 3931 Newton Road,Stockton, California <br /> SJCEHD Site#1703 <br /> Dear Mr. Henderson: <br /> We are currently in the middle of our Soil Vapor Extraction Test(SVET)using existing onsite <br /> monitoring well GT-MW 10. We are recovering good flow rates through this well (greater than <br /> 100 scfm) with a small blower unit(<2 horse power). Our current field instrumentation test <br /> results for vacuum readings taken at other monitoring wells are shown on Figure 4. It is clear <br /> that detectable vacuum is occurring at distant wells (over 150 feet). <br /> We would like to continue the SVET at the site using our portable equipment and set up on <br /> monitoring wells that are nearby the probable subsurface petroleum hydrocarbon contaminant <br /> mass. The wells include: GT-MWS, 6, 9, 13, 16 and 17. We will switch out the granular <br /> activated charcoal (GAC) drums at the first sign that breakthrough is occurring. This will be <br /> documented by both field PID readings and analytical laboratory results from air samples. We <br /> will insure that there are no unauthorized emissions from these tests. <br /> We anticipate keeping the SVET equipment at each well for a period of about 24 to 48 hours. <br /> During that time we will make vacuum measurements at the other existing monitoring wells with <br /> screened intervals in the same zone as the extraction well. We are convinced this additional <br /> testing will be conducted in accordance with the San Joaquin Valley Air Pollution Control <br /> District(SJVAPCD)requirements governing pilot tests not to exceed five days per site because <br /> we have multiple subsurface zones at the site that we are testing. Each one of these individual <br /> well SVET operations is considered by us as an independent test. <br /> Gillies\SVET Workplan Amendment 08252010.wpd I <br />