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surface of the cover soil? These questions were not clearly <br />addressed in the final report. It is clear that the requested <br />incremental depth sampling was not conducted in 1995, and as a <br />result an intensive sampling program will need to be conducted in <br />June or early July of 1996, if WFU intends to sumbit a revision <br />request for reduced cover depth. The results of the soil sampling <br />program will be particularly critical to any reduction of the 4 <br />foot cover depth due to the inconclusive vegetation response. <br />Based on review and consideration of the soil and refuse data <br />collected to date, and relevant literature review, the following <br />sampling program is recommended: <br />Sample parameters should at a minimum include textural <br />analysis, pH, EC, SAR, and selenium (due to the marginal <br />selenium levels indicated in the 1990 refuse sampling). <br />Centrally located soil pits should be excavated in each <br />of the eight plots, extending at least two feet into the <br />underlying refuse. Samples should be separately <br />collected, bagged, labeled, and analyzed for each l foot <br />depth increment from the exposed face of each test pit, <br />with the exception that the one foot increments <br />immediately above and below the soil/refuse boundary <br />should each be split into two 6 inch sample increments in <br />order to better detect any interface effects which may <br />have occurred. Exchangeable sodium percentage (ESP) <br />should be reported for the refuse samples, in addition to <br />the parameters listed above. <br />We would request that, if WFU does choose to pursue a technical <br />revision for cover depth reduction, the revision application should <br />be submitted by early September, 1996, in order to allow for <br />decision issuance prior to the end of the field season. Should <br />initiation of final reclamation be required on any portions of the <br />active refuse pits this fall, the four foot cover depth will be <br />required unless a revision allowing some lesser depth has been <br />approved. <br />Please contact me if you have any questions. <br />Since ly, <br />r--- <br />I," G,. ~ , <br />Dal/rf thews J <br />Environmental Protection Specialist <br />enclosure <br />cc: Larry Routten, DMG <br />des\refcov96.ltr <br />