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WJE"STOJv ai S 0 c V t o n CA f.-.� TEL N'0 . 209 415 1F-5 Mar `14 , 90 13 :-0 1> . G.1 <br /> process may require several months for the degrAdation to' occur. <br /> These heavy fraction compounds do not readily lend themselves to <br /> aeration and the majority . of dogradmtion will be ,the result of <br /> microbial activities. This process would require monthly sampling <br /> of the soils to monitor the degradation process as Well as biweekly <br /> mulching and turning to 'enhance the degradation/aI6ration process. <br /> Once the TPH concentrations have aPVroached or reached the non- <br /> detectable range, the stockpile soils' may be land, applicated. <br /> The second option available is the offsite disposel` of the soils. <br /> In the San Joaquin County area, a local company offers services for <br /> disposal of soils which contain T-PH concentrations less than 1000 � <br /> mg/Kg. They provide transportation for the <br /> certification. Soils.. and disposal <br /> Taking into consideration the need to expedite the tank area { <br /> closure and due to the' fact that closure is contingent upon a <br /> resolution of, the s011 stockpile issua, it is recommended that the <br /> stockpiled soils be disposed of off-site. <br /> According to tank removal/excavation contractor, Precision <br /> Industries, the three stockpile comprise a total -.of approximately <br /> 150 cu. yds . The transportation and disposal. price for the local <br /> disposal company, Forward, Inc. , is $75 per cu. yd. , amounting to <br /> approximately $11, 250. An additional' estimate of $1500 to °$2000 <br /> will be required for loading of- the material. <br /> While aeration' of the soils would. be slightly.. less . expensive <br /> (approximately $8, 000 which includesiuulching, turning, sampling, ; <br /> etc. ) , WESTON feels it would behooveNBorden, Inc.', to dispose of <br /> the stockpiled soils off-site so •that closure of ;;the underground <br /> storage tank -areas is not contingent upon this issue. <br /> I <br /> Should you have any further questions regarding th:i's matter, please <br /> feel free to Gall me at WESTON ' s Stockton., California office. <br /> Sincerely, , <br /> RAY F. WESTON, INC. <br /> Erik A. Friedrich,' R.E.A. , R.E.P. <br /> Projeot Manager <br /> EAF/cmc <br /> Enclosure <br /> ac: Mr. George 3epp';on <br />