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Regional Board Staff Recommendations 10 August 1990 <br /> Preliminary Site Investigation <br /> 111 .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 /> greeter than 50 feet, the responsible party must complete the <br /> following work: <br /> III.2.a. Determine the extent of the soil contamination. <br /> i <br /> i <br /> Field meters are acceptable screening tools , but <br /> laboratory analysis of soil samples are requirea 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 Boara <br /> guidance. <br /> The Regional Board will assess the necessity Of <br /> monitoring wells on a site-specific basis . <br /> GROUND WATER MONITORING REOUIM�—KHTS <br /> If grouna water contamination is not discoverea, some mins ri= <br /> i ground water monitoring may still be requirea depending on the <br /> depth of the soil contamination. Ground water monitoring <br /> frequency and analyses will be established by the local aaency <br /> with Regional Boara concurrence . <br /> If ground water contamination is discovered and/or floating <br /> proauct 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 ana <br /> vicinity characteristics . It may be appropriate to begin with <br /> weekly sampling of the water level, free product and dissolvea <br /> constituents , with the frequency reducea to a monthly or <br /> quarterly interval as sufficient information is collectea. <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 SAMPLING AND ANALYSIS <br /> FOR ROUTINE TANK REKDVALS <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 />