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UST Closure Report Sharpe Defense Distribution Region West Lathrop,California Page 8 3.2.6 Removal of Dispenser Islands and Piping The concrete dispenser islands and drive pads covering buried piping were demolished with a Hitachi EX200 excavator with a Teledyne TB830X breaker attachment then loaded into ten, 10 cubic yard-capacity bins with a Volvo L90 with a bucket attachment, on January 12, 13 and 26, 1999. Concrete was transported by Delta Container Corporation to their recycling facility on January 26. The product and vapor return piping was exposed by trenching and removed from trenches with a backhoe on February 4. All residual rinsate in the piping was drained into a container, then picked up on February 5 (50 gallons total) by a vacuum truck owned by American Valley Waste Oil, Inc. for transport to a treatment/disposal facility. On February 2 and 4, a John Deere 310 backhoe with a clamshell bucket placed the piping into a 20 cubic yard-capacity roll-off bin for transport to a treatment and disposal by Ecology Control Industries (ECI). Two concrete drive aprons did not require removal to expose buried piping and were left intact: the small apron between the monitoring building and the small dispenser island, and the larger apron just west of the overhead truck dispenser island. 3.3 Stockpiling Excavated Material The soil from UST excavation was placed temporarily in five stockpiles along the west and south sides of the excavation on December 23, 1998. The stockpiles were estimated to contain a total volume of 715 cubic yards by Mr. Travena (SJCEHD). Mr. Travena noted in his `Official Inspection Report' (Appendix 8) that the stockpiles comprised predominantly sandy loam with some clay, or sand. He also noted that these had no obvious petroleum hydrocarbon odor or unusual discoloration. The five stockpiles on the sides of the UST excavation were consolidated into two stockpiles on January 11, 1999, and covered with 6 mil-thick plastic sheeting. Stockpiles, SPA and SPB, were located just west and northwest of the UST excavation (see Figure 4). They were estimated by the SJCEHD inspector,Mr. Steve Sasson, to contain 300 and 250 cubic yards, respectively. On February 2, 1999, Ms. Karen Bessett, an inspector with the Central Valley Regional Water Quality Board (CVRWQB) instructed CAL INC to relocate stockpiles SPA and SPB, mix and aerate the stockpiled materials during the move, then resample the soil for chemical characterization. Stockpile SPA was moved to a large vacant area of asphalt paving and gravel about 240 feet south of 3rd Avenue and 265 feet east of F Street (Figure 7) on February 3, 1999 with a Volvo L90 loader, a John Deere 550 80 HP dozer and two, 10-wheel dump trucks. The new stockpile was placed on 30-mil thick plastic sheeting and covered with two layers of 10 mil thick plastic sheets. The plastic sheeting was draped over a perimeter of stacked sandbags to contain any leachate from the stockpile. Later on February 3, before moving stockpile SPB, Mr. Steve Sasson(SJCEHD) informed CAL INC by telephone, that a permit should be obtained from the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) before aerating the stockpiled soil. N:\PROJECTS\3546\Reports\3546 UST Closure Report Draft.doc March 24,1999