ARCHIVED REPORTS XR0009904 - Laserfiche WebLink

Home Browse Search

Corrective Action Plan Page 33 so affected can be added to a spread of soil that is already aerating at a rate of 60 cubic yards per day This figure has been used for planning The results of the analyses of the composite samples taken from the stockpile will be used to determine the actual maximum permissible rate (in cubic yards per day) at which untreated soil can be added to an already aerating spread That rate may be either higher or lower than the preliminary estimate of 60 cubic yards per day Aeration of Contaminated Soil To aerate the soil, it will be removed from the stockpile and spread to a uniform thickness of approximately 6 in to 9 in over the treatment area When the total volume to be spread on any given day has been extracted from the stockpile the cover of clean soil will be restored over the area of the pile from which it was removed (Note The soil that first arrives at the aeration site on any given day will, within the limits imposed by Rule 4651, be directly spread for aeration without stockpiling ) ' After spreading, the soil will be rototilled throughout its full spread thickness to accelerate volatization of components of gasoline It will then be left to aerate for a period before it is inspected for visual or olfactory signs of remaining traces of components of gasoline As fudged necessary to accelerate aeration, the spread may be periodically rototilled again, one or more times, at intervals that will be dictated by the weather and the remediation contractor's schedule Sampling of Treated Soil When visual and olfactory indicators of components of gasoline are no longer present in the spread of aerated soil, it will be statistically sampled to determine the concentrations, if any, of remaining traces of components of gasoline that might remain in it Estimated Number of Samples Required from Spread of Aerated Soil The number of ' samples required to demonstrate that the aerated soil has been cleaned of components of gasoline can be estimated from the available data obtained from soil sample recovered from the borings drilled to install monitoring wells on, and in the vicinity of, the 152 East 11th Street site As is documented in Table 2, the following concentrations of total volatile hydrocarbons (TVH) were detected in samples within, or adjacent to, the zone of the subsurface that will be excavated to remove contaminated soil Well Sampling TVH No. Depth ft mg/Kg NAV 1 8 1,5000 NAV 3 8 08 �5