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{ LIN toil <br /> • Fuel Oil Polishing placed a 2-loot layer of clay. outained trom 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 installcd to provide a barrier bct"een <br /> groundwater and shallow soils which have a low level of hydrocarbon <br /> contaminalwa <br /> • The aerated soil piles were transferred to the excavation, and compacted in 2- <br /> toot layers Field activities onsite were completed on October 20, 19510 <br /> 60 <br /> In summary. <br /> • Soil samples were er,llected trom the walla of the excavation pit No significant <br /> c,ontaminatiun of gasoline, BTEX, or oil and grease was left in the excavation <br /> following completion of soil remediation activities <br /> • During excavation, a 500-gallon 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 /> on August 17, 1990 Analysis of soil samples collected from beneath the <br /> fo-mer location 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 and grease ranged from 50 ppm to 300 ppm <br /> • Based on the results of analysis of samples of aerated soil, Clayton <br /> recommended backfilling the excavation on September 28, 1990 Soil <br /> backfilling was completed in the week ending October 21, 1990. <br /> • Because of residual oil and grease in the: aera-ed soil, a 2-loot layer of <br /> compacted clay was placed in the bottom of the excavation, before it was filled <br /> with aerated soils. This clay layer was installed to provide a barrier between <br /> groundwater and shallo% soils which have a low level of hydrocarbon <br /> contamination <br /> Clayton recommends ro turther soil or groundwater remediation at this site <br /> Lim,ita L= <br /> The information and opinions rendered in this report are exclusively for use by <br /> Client Clayton Environmental Consultants, Inc will not distribute this report <br /> without your uonsent except as may be required by law or court order The <br /> information and opinions expressed in this report are given in response to our <br /> -7- <br /> 1104 <br /> 7-11W RLP <br />