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fy. Zig OR M.N . RE San Joaquin Local Health District Re: Site Re-excavation and Resample work plan, 6215 Tam O'Shanter, October 10, 1989 _ Page 2 of 3 Stockton, CA -- - -- - - -- -- -- -- -- - 5. Re-excavation and resample steps: There is an open field to the west of the property. The property is owned by Hammertown Partners and written permission to encroach upon the property for purposes of clean up is attached. (Western Empire Management Corporation letted dated August 2B, 1969). The fence at the west �ide property line shall be partially removed. Jim Thorpe Oil proposes to re-excavate the area starting with the clean backfill placed on plastic in the hole, removing it and setting it aside on site. The plastic liner will be removed and set aside on site, on plastic and covered with same. We will then remove all the original soil remaining in the original excavation and stockpile on site, on plastic and cover with same. At a point midway in the length of the original excavation, we will start excavating down to a depth of 24 feet and extend westward 25 feet from the starting point. The excavation will be extended north and south 10 feet from the sides of the original tank location, resulting in an excavation 25 feet long by 24 feet wide by 24 feet deep, hopefully to remove all contaminated soil from, in, and around the excavated area. See drawing "C" showing a top view of the site for previous and proposed excavationl and stockpile areas. Drawing "D" is a side vies, of the previous tank location and excavation, and proposed excavation. All contaminated soil will be kept separate and placed on site, on plastic and covered with same. There will be approximately 542 cubic yards of soil excavated; a minimum of 22 soil samples are required. We propose to take samples as shown on drawings "C" and "D" and listed here: 6 samples from the bottom at'24 feet 4 samples from the stockpiled soil 12 samples from the sidewalls, midway in each wall length in 5 foot depth intervals, starting at 21 -feet through 11 feet (i.e. 21', 16' and ll ') 22 Total samples The 21 foot sidewall samples and bottom samples will be analyzed first so a deter- mination can be made regarding the need to analyze the shallow sidewall samples. hop bucket by the above properly The samples will be taken from the teeth of the licensed facility. The soil samples will be taken with brass tubes. For analysis to be done, see the highlighted area of the "Minimum Verification Laboratory Analy- sis" sheet enclosed, A temporary fence will be placed around the excavation until soil sample analysis results are n,2turned. Hopefully the sample result levels are low enough to allow aeration of the excavated soil on site under permits, guidelines, and direction of the San Joaquin County Air Pollution Department. if the level of contamination shows too high for aeration, the soil will be transported to a proper hazardous waste facility for disposal, namely Kettleman City or possibly a Class 2 site, such as.Forward, Inc. If the soil is removed from the site, it shall be transported under proper licensure. Any manifests produced during transfer shall have a copy provided to SJLHD within 30 days.