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WORKPLAN for RE-EXCAVATION & RESAMPLE 21.167 No TRETHWAY ROAD ACAMPO, CA SITE CODE 4359 Prepared by Wm J Hunter & Associates September 25 , 1991 Revised October 18 , 1991 1 Move in Jim Thorpe Oil equipment, remove pump house and associated piping and electrical lines located at southwest corner of existing excavation 2 Remove approximately 5 feet of material from the south wall and southeast corner of the existing excavation, under the direction of Wm J Hunter & Associates personel Spoil to be placed on plastic adjacent to existing pales located to the west of the excavation. It is estimated that a maximum of 152 cubic yards will be removed from this area, the actual amount will depend upon evaluation of the site • during excavation. 3 Remove approximately 3-5 feet of spoil from the north wall in the vicinity of previous sample #4 , actual amount to be determined as excavation proceeds , estimated to be 47 cubic yards 4 . Using the backhoe bucket, obtain samples from the sides and bottom of the newly excavated areas under the direction of the geologist and the representative from the County Samples to be collected in properly cleaned brass tubes supplied by FGL Environmental , sealed, labeled, stored, and transported to the lab under proper chain of custody Proposed re-excavation areas and sample locations are shown on Exhibits A, B, & C. 5. Samples to be analyzed for BTEX, TPH--G, TPH-D, EDB, and TOG, using test procedures and detection limits as specified by Tri-Regional Recommendations and EHD 6 Excavating and sampling operations to be witessed by a representative of the San Joaquin County EHD 7 Spoil removed from the re--excavation will be sampled as directed by the geologist & the County representative, and . will be tested for TPH-G, TPH-D, EDB, and oil & grease 8