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Mr. Anthony snara • <br /> Page 6 <br /> April 14, 1988 <br /> Will you be retaining the material from continuous coring for <br /> Possible later analysis? We recommend that cores be placed in <br /> core boxes and be archived in the proper environment to preserve <br /> them for future consultation. <br /> 21. Page 27, section 2 . 5. 2 . Explain how the locations for <br /> monitoring wells were arrived at. Three monitoring wells will be <br /> adequate at this point in the Remedial Investigation, but <br /> additional wells may have to be installed if the information <br /> gathered from the currently proposed investigation warrants it. <br /> 22 . Page 28 , section 2 . 5. 2 . We suggest the use of wire wrapped <br /> PVC screen sections for better development. It's very important <br /> that you engineer the filter pack. The filter pack material size <br /> can be found by conducting a sieve analysis of the material taken <br /> from the location that the screened section will be placed. <br /> Enclosed is the appropriate section of the Decision Tree on sieve <br /> analysis. <br /> 23 . Page 28 section 2 . 5 . 2 . Be specific about how wells will be <br /> developed. We advise the use of a vented surge block for well <br /> development, with attention given to limiting the negative <br /> pressures developed in the casing so as not to collapse it. <br /> 24 . Page 30, section 2 . 5.4 . It is not clear specifically how <br /> and where samples of runoff or runoff associated soil will be <br /> collected. The last sentence of this section needs to be <br /> clarified. <br /> 25. Page 31, section 2. 5. 6 (a) . What are the criterion for <br /> selecting a particular soil sample for analysis? <br /> 26. Page 32 , section 2 . 5. 6 (b) . Use SW-846 method 7471 for <br /> analysis of mercury in soils, method 7470 for analysis for <br /> mercury in liquid samples, method 6010 for metals in water <br /> samples except for mercury (as noted above) , and selenium (use <br /> method 7740) . <br /> 27 . Page 32, section 2 . 5. 6 (c) . Be specific as to what <br /> background soil samples will be analyzed for. <br /> 28 . Hazardous waste site remediation must comply with the <br /> California Environmental Quality Act (CEQA) . As a first step in <br /> meeting these requirements an "Initial Study" is required to be <br /> submitted by you (the applicant) . I have enclosed the form <br /> (Appendix H) to follow in generating it. Please submit the <br /> study, in draft form, with the Remedial Investigation Report. <br />