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5 <br /> Clavtori <br /> • Fuel Oi! Polishing placed a 2-foot layer of elay, obtained from the walls of the <br /> excavation, on top of the gravel. This clay was compacted with a vibratory <br /> sheepsfoot roller. This clay layer was installed to provide a barrier between <br /> groundwater and shallow soils which have a <br /> contamination. low level of hydrocarbon <br /> • The aerated soil piles were transferred to the excavation, and compacted in 2- <br /> foot layers. Field activities onsite wero completed on October 20, 1990. <br /> 6.0 CD V QNS 11ENQL 9L <br /> _AND QM <br /> In summary: <br /> EM <br /> • Soil samples were collected from the walls of the excavation pit. leo significant <br /> contamination of gasoline, BTEX, or oil and grease was left in the excavation <br /> following completion of soil remediation activities. <br /> • During excavation, a 500-9allon concrete septic tank was discovered. This tank <br /> contained about 8 inches of waste oil and about 30 inches of solid oily sludge. <br /> Clayton obtained a permit for the removal of this tank. The tank was removed <br /> cn August 17, 1990. Analysis of soil samples collected from beneath the <br /> former Iocation of the removed septic tank did not reveal any significant <br /> contamination. <br /> • After aerating the excavated soil, eight composite samples were collected at <br /> the direction of PHS/EHD and analyzed for TPH as gasoline, BTEX, and oil <br /> and grease. Laboratory analyses revealed the following: <br /> - Gasoline, benzene, ethylbenzene, and xylenes were.not detected <br /> Toluene was detected at concentrations of between 21 ppb and 220 ppb <br /> - The concentration of TPH as oil andgrease ranged from 50 ppm to 300 ppm <br /> • Based on the results of analysisof.samples of aerated soil, Clayton <br /> recommended backfilling the excavation on September 28, 19:90, Soil <br /> backfilling was.co.►npleted in the week ending October 21,.195p. <br /> • "Because of residual oil and - <br /> gre <br /> compacted clay-was plaase in the aerates; soil, a 2-foot layer of <br /> ced in the bottom of the excavation, before it was filled <br /> with aerated soils. 'This clay layer was installed de a barrier be�;• <br /> vi �en <br /> groundwater and shallow soils which have a law leve!to provide <br /> hydrocarbon <br /> contamination. <br /> Clayton recommends no further soil or groundwater remediation at this UmiQIl� <br /> Thu information and opinions rendered in this report are exclusively for use by <br /> Cllent. Clayton Environmental Consultants, Inc. will not distribute this report <br /> without your consent except as may be required by law orcourt order. The <br /> J info <br /> `rmation and opinions expressed in this report are given in response to <br /> our <br /> -7 <br /> M3141REP <br />