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0909MHAN <br /> AGS Job #87036-2 <br /> Page 2 <br /> These piles were left covered with plastic. The total volume of <br /> soil excavated during this second phase of excavation was <br /> approximately 30 cubic yards. Approximately 10 yards of this <br /> soil were removed per day from the larger, covered piles and <br /> aerated until the entire volume of soil was treated. <br /> Two composite soil samples (S-AERATE-1 and S-AERATE-2) were <br /> collected on August 21, 1987 showed that soil contamination <br /> levels had been reduced to 23 . 69 parts per million and 23 . 86 <br /> parts per million. Aeration has continued to the present time <br /> with periodic turning of the soil. The levels detected imply <br /> that the soil has been successfully treated to concentrations <br /> suitable for being returned to the tank cavities. With the <br /> authorization of Kayo Oil Company and the permission of the San <br /> Joaquin Local Health District ( JLHD) , the base of the tank <br /> cavities will be backfilled with a thickness of approximately 5 <br /> feet of pea gravel. PVC pipe and slotted 4-inch inner diameter <br /> casing will be placed as indicated on Plate P-1 for future use as <br /> parts of an infiltration gallery in a proposed plan to mitigate <br /> soil contamination by biodegradation. <br /> Copies of Chain of Custody Records and laboratory Reports of <br /> Analyses are attached. Backfilling of the tank cavities will <br /> begin as soon as authorization J s received from Kayo and the <br /> SJLHD. Please call if there are any questions regarding any <br /> aspect of this project. <br /> Sincerely, <br /> Applied GeoSystems <br /> e'Z 0 <br /> 4, <br /> Andrew P. Lush <br /> Project Geologist <br /> APL/pl <br /> Enclosures <br /> A,vo/ied GeoSystems <br />