ARCHIVED REPORTS_XR0008402 - Laserfiche WebLink

Home Browse Search

t Kennedy/Jenks/Chilton Backfill Activities ' Prior to backfilling the excavation, compaction testing was performed on the soil removed during tank excavation that was to be used as backfill . Compaction testing was performed to determine whether or not the backfill material would meet compaction requirements identified in the specification. On 4 May 1990, a Kennedy/Jenks/Chilton representative collected an approximately 3-gallon sample of stockpiled material ' removed from the tank excavation for compaction testing. Compaction testing was performed by Kleinfelder, Inc. , a geotechnical consulting firm and material testing laboratory. The results of their testing is ' provided in Appendix E The tank excavation was backfilled on 10 and 11 May 1990. The bottom of the excavation was backfilled with pea gravel to approximately 4.5 feet ' below ground surface. Pryor to backfilling, the excavation was lined with a filter fabric to prevent crossing of native soils The top of the pea gravel was also covered with the fabric before backfilling with soil . Soil was backfilled in approximately 1- to 1-1/2-inch lifts and ' then compacted with a whacker A representative of Kleinfelder, Inc. was present during backfill activities to perform compaction testing The first lift was made using soil excavated during removal of the tank ' However, due to the lack of moisture in the stockpiled soil , compaction was difficult to achieve. Because of the amount of time required to bring the moisture content up in the stockpiled soil , it was decided that a portion of the soil imported for backfilling the DDT soil excavations would be used for the tank excavation. Backfilling and compaction of the tank excavation was completed on 11 May 1990 The Kleinfelder report and compaction testing report sheets are provided In ' Appendix E. The stockpiled soil remaining from the tank excavation was placed over ' the clean backfill in excavation Area 1. This was performed in order to alleviate a low spot in the sales yard. Remaining pea gravel was spread out in the southern portion of the sales yard over an existing gravel ' surface. DISPOSAL OF STORAGE TRAILERS AND CONTENTS ' Empty storage trailers number 1 and 3 were transported to Peregren's construction yard on 13 April 1990 Each trailer was transported by loading it onto a semi-truck flat bed trailer and securing it with tie- downs Loading and transportation was performed by Kern Backhoe Service, a subcontractor to Peregren. Lab-packing of the 5-gallon pesticide containers located within storage ' trailer number 2 was performed by Peregren on 24 April 1990 and 10 May 1990. Lab-packing was performed by layering absorbent material (saw dust) and pesticide containers inside of 55-gallon steel barrels Each pesticide container and the barrel used for lab-packing were marked with identification numbers for reference. A total of seven barrels (marked KJ-1 through KJ-7) were required for lab-packing as only two 5-gallon WPI13 3.5 882526.01