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r San Joaquin Health Services Re: 6540 E. Jahant Road, Acampo, CA August 19,_1991 - Page 2 of 2 Re-excavation/resample work plan 7. Re-Excavation/Resample: Due to the depth of ground water and the small size of the tank Jim Thorpe Oil , Inc./dba Rich-Mart Construction and Wm. Hunter & Associates, Registered Geologists, feel the best method of clean up will be a re-excavation/resample. The excavation will start at a point 5 feet east of the existing excavation and extend west to a point approxmiately 20 feet distant and a point south approximately 5 feet from the existing excavation to a northerly point and approx- imately 20 feet distant. The excavation shall be approximately 20 feet in depth. The close proximity of a large tree (see attached plot plan) precludes excavation to the northwest any long distance. Hopefully, all contamination will be cleaned up within the parameters suggested. The resulting excavation will be approximately 20 feet by 20 feet by 20 feet. Total amount of spoil removed will be approximately 300 cubic yards. All spoil will be placed on 6 mil plastic and covered with same on site. Soil disposition decisions can be made after amounts and con- tamination levels are ascertained. Samples will be taken at the middle of the length of each side wall approximately 2 feet up from the bottom and 5 feet above that (i .e. 7 feet from the bottom) and 4 bottom samples at approximately 2 feet in from the side and ends of the excavation, 4 samples will be taken from the spoils pile resulting in 16 soil samples total . Soil samples will be analyzed for EDB, BTEX, and TPH-G. Water sample will be taken from the well on site at the time of excavation and analyzed for same. The entire project will be under the direction of Wm. J. Hunter & Associates, Registered Geologists. All reports, conclu- sions, and recommendations will be made by them. Scale drawings showing existing excavation, proposed excavation, sample locations and plot plan are attached. 8. Health and Safety plan attached. 9. Timing: Sampling could be scheduled within two weeks following your review of this work plan. The sample analyses should be ready for your review within three weeks after they have been taken.