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Hardte9 LyNson Associates <br /> August 12, 1904 <br /> 11721 007 <br /> RWQCB <br /> bir.James arathovde <br /> Page 2 <br /> Excavation of the berm and final grading and compaction of the pond area will be performed upon <br /> receipt of chemical analysis indicating that wastes have been removed and approved by the RWQCB. <br /> Should chemical analysis indicate that soil beneath removed wastes require removal, further <br /> excavation and disposal will be conducted. <br /> Confirnratfon Sam ' <br /> To assess the potential for impact to soils beneath the pond, seven 2-foot borings and one 8-fool boring <br /> era proposed- The seven two font borings will be drilled within the pond. The seven borings will <br /> equal approximately one boring for every 3,000 square feet of pond surface. The 2-fool borings will be <br /> drilled upon removal of the sludge and pond water. The 8-fool boring trill be drilled outside the pond_ <br /> The purpose of this dor ng is to collect samples to be representative of background conditions. <br /> Samples will be collected at &0, 7.0,and BA feet bgs. These depths are intended to correlate with the <br /> sample depths from the pond_ This currelati❑n is based on the assumption that the pond bottom is <br /> approximately 0 feet lower than the surrounding groundsurface_ The borings will be drilled using <br /> hand auger drilling equipment. samples will be collected at the surface, 1.0, and 2.0 feet below the <br /> ground surface (bgsJ. The samples will be collected suing a hand driven sampler lined with stainless <br /> steel liners. Upon collection, the samples be capped. <br /> �ed al sealed, <br /> , labeled, <br /> ed, and under placed in a chain of custodyfilled <br /> container. The samples will be transportedYt <br /> procedures. <br /> Samples submitted to the laboratory will bo analyzed for the following: <br /> Arsenic Chromium <br /> Lead Nickel <br /> Sodium Chloride <br /> sulfate Sodium adsorption ratio <br /> The selected constituents are intended to be indicators that are representative of the pond contents <br /> based on the results of analyses from the provioUs waste characterization invcsligatiens_ To evaluate <br /> the potential for the soils to have been impacted, analytical results from the soil samples collected <br /> within the pond will be compared to the results from the samples collected from the 8-foot boring and <br /> the soil borings previously drilled at the site. <br /> Schedule and Reporting <br /> pond closure activities are anticipated to begin on August 15. 1994. Currently, it is anticipated that <br /> one week will be required to remove the remaining contents of pond. Upon completion of removal of <br /> the pond contents,the confirmation borings Will be drilled and sampled- Assuming a two week turn- <br /> around time for the laboratory, and a one week for a letter of preparation to <br /> submit <br /> to 9t e 4W QCS, a <br /> letter outlining the analytical results will be submitted to the RWQ on September <br /> Assuming an expedited review of the letter by the RWQCB.it is assumed that a determination if <br /> additional excavation is required or if closure is appropriate can be made within one week of submittal <br /> of the letter to the RWQCB. This schedule will allow approximately two weeks before the start of the <br /> rainy season (October 1, 1994) to conduct additional investigations andlor level the pond hack to <br /> original grade. <br /> L00 fill O.LN8RY8�V5 V'I9 CC9SV9C9T6T,�I, 00�5T b6:91/8D <br />