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March 11,2005 NOA Project Number: E040150A 6.0 PERCOLATION TEST INFORMATION 6.1 Percolation Test Locations Y1 site map indicating the locations of the percolation test holes is included as Plate 1 of this report. �. 6.2 Number of Percolation Tests One shallow percolation test were conducted on each proposed parcel of the Site, for a total of five 60 v� shallow percolation tests. 6.3 Boring Preparation and Presaturation The soil borings on Parcels 1,2, 3 and 5 were advanced on the Site with a hand auger February 8, 2005. The soil borings on Parcel 4 was advanced on the site with a hand auger on March 3, 1005. A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of water in the percolation test boring. Approximately 2 inches of"pea gravel" were placed in the bottom of the open soil boring,then the PVC pipe was installed on top of the gravel. Several feet of"pea gravel" were backfilled in the annular space. Presaturation of the percolation test hole on Parcel 2 occurred on February 14,2005,the l/=SbA'► presaturation of the percolation test hole on Parcels 3 occurred on February 16,2005,the rLloioen presaturation of the percolation test hole on Parcel 1 occurred on February 22,2005, the i!:yam presaturation of the percolation test hole on Parcel 5 occurred on February 23,2005 and the 9=��+^^ presaturation of the percolation test hole on Parcel 4 occurred on March 6,2005. The depth ofj/-�a/yn water used for presaturation was 12 inches above the bottom of the boring. 6.4 Condition of Borings After Presaturation After the 24-hour soak period, the presaturated holes were found to be intact on the day of testing. The holes on Parcels 1, 3,4 and 5 were dry on the day of testing.The hole on Parcel 2 had water in the bottom on the day of testing. 6.5 Percolation Test Procedure A percolation test was conducted for Parcel 2 on February 15,2005 in accordance with the requirements of the EHD. A percolati est with a duration of onhour w ed for e� hole. The entirety of the percolation test was observed by Mr. Ray Borges,Registered Environmental Health Inspector,EHD. The percolation test was conducted for Parcel 3 on February 17,2005,in accordance with the requirements of the EHD. A percolation test with a duration of four hours was performed for each hole. The final half-hour of the four-hour percolation tests were observed by Ms.Lisa Medina,Registered Environmental Health Inspector, 8 0,44