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All Pure Chemical Inspection ort -3- <br /> The pond and supply well samples were sent to an independent laboratory for analyses of VOCs and total <br /> petroleum hydrocarbons (TPH). The laboratory analytical results are attached. The sample identified as <br /> Pond 5 is a travel blank. The presence of VOCs in Ponds 1, 2, 3, and 4 was confirmed. TPH was not <br /> detected in any of the ponds. <br /> Although neither water supply well contained VOCs, these samples were obtained from a high pressure <br /> spigot which may have allowed the loss of volatiles during sample collection. These wells should be <br /> resampled using techniques to minimize volatilization to confirm the January 1996 results. <br /> Summary and Conclusions <br /> Analytical results from the wastewater ponds from January 1988 and January 1996 show that the ponds are <br /> sources of carbon tetrachloride, chloroform, and other VOCs. The poor condition of the liners in Ponds 1 <br /> and 2, the lack of a liner in Pond 3, and regular overflow from the ponds during the winter months indicate <br /> the likelihood that the wastewater in these ponds is migrating downward to the shallow ground water. <br /> Migration of water from the ponds to the water table has probably resulted in a ground water mound <br /> beneath the ponds, given the depth of the ponds (four feet) and the shallow ground water (between <br /> approximately nine and 16 feet bgs). Because monitoring wells MW-2 and MW-3 are near the ponds, the <br /> mounding could account for the apparent flow direction to the southwest in the onsite shallow ground <br /> water. Once outside the influence of the mounding, the regional ground water flow to the northeast <br /> probably predominates, moving the VOCs in ground water originating at the All Pure facility to the <br /> northeast. <br /> The lateral and vertical extent of VOC contamination in ground water needs to be determined. It is <br /> necessary to sample ground water offsite to the northeast of the All Pure facility to determine the lateral <br /> extent of contamination. <br /> The two supply wells should be resampled to confirm that VOCs are not present. <br /> All Pure has submitted a closure plan for closure of the three process wastewater ponds. This plan must be <br /> reviewed and approved by the Board. <br /> PAL/pal/lsb <br />