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Regional Board Staff Recommendations 10 August 1990 <br /> Preliminary Site Investigation <br /> III . 2 . Seasonal high ground water greater than 50 feet <br /> In cases where a soil/ground water investigation has been <br /> required and the depth to the seasonal high ground water is <br /> greater than 50 feet, the responsible party must complete the <br /> following work: <br /> III. 2.a. Determine the extent of the soil contamination. <br /> Field meters are acceptable screening tools , but <br /> laboratory analysis of soil samples are required for <br /> verification of the extent of soil contamination. <br /> [SUPPLEMENTS LUFT SECTION II C. 2] <br /> III .2.b. Install monitoring well(s ) per Regional Board <br /> guidance. <br /> The Regional Board will assess the necessity of <br /> monitoring wells on a site-specific basis . <br /> GROUND WATER MONITORING REOUIREK_ENTS <br /> If around water contamination is not discovered, some minimum <br /> ground water monitoring may still be required depending on the <br /> depth of the soil contamination. Ground water monitoring <br /> frequency and analyses will be established by the local agency <br /> with Regional Board concurrence. <br /> If ground water contamination is discovered and/or floating <br /> product is found, a monitoring well sampling frequency must be <br /> established with Regional Board staff concurrence. Monitoring <br /> well sampling is to occur on a frequency based on the site and <br /> vicinity characteristics . It may be appropriate to begin with <br /> weekly sampling of the water level, free product and dissolved <br /> constituents, with the frequency reduced to a monthly or <br /> quarterly interval as sufficient information is collected. <br /> Quarterly monitoring is the maximum sampling interval typically <br /> allowed when ground water contamination is present unless other <br /> arrangements are made with Regional Board staff . [ADDS TO LUFT) <br /> SOIL AND GROUND wATER SAMPLINC AND ANALYSIS <br /> FOR ROUTINE TANK REMOVALS <br /> Table #1 , titled "Sampling For Routine Tank Removals " , specifies <br /> the minimum number and location of soil and ground water samples <br /> to be taken upon routine tank removal . The number of samples and <br /> the location of the samples varies depending on the tank size . <br /> 12 <br />