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March 17, 2005 _ <: NOA Project Number.: E05008A - 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. Presatutation of the percolation test holes on Parcels 5 and 6 occurred on March 1, 2005, presaturation of the percolation test holes oriaxce1 4,and 7 occurred on March_ 2,_2005 and Tresaturation of thepercolation.test holes odParcels 1 and 2 occurred n March 3 2005. The depth , of water used to pre-soak was 12 inches above the bottom oe b oring: 6.4 Condition of Borings After Presaturation F1 =4 After the 24-hour soak.period, the presaturated holes were found to be intact and-dry on the day of C6.5 Percolation Test Procedure Percolation tests for Parcels 5 and 6 were conducted for,the borings on March 2, 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 each four-Hour percolation test was-observed.by.Mr. Mike Escotto, Registered Environmental Health Inspector, EHD. Percolation tests for Parcels 3, 4"and 7,- were conducted for the borings on March 3, 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 each four-hour-percolation"test-was observed liy Mr. Mike Escotto, Registered Environmental - - Health-Inspector, EHD:. ;Percolation tesis.for Parcels-1 and 2 were conducted for-the boriui-s on_ March.4, 2005 in accordance with the requirements of tli ., :'�A-percolation test with-a duration of ro,77ours was performe or eac o e: .The final half-hour of each four-hour percolation test' was observed by Mr. Mike Escotto;'Registere.d.Environrnental Health°Inspector, EHD. Measurement of the water level during the percolation ercolation test was from:a fixed reference point on-the .; _ _ - PVC casing using an electricwell sounder with an depth accuracy of.,1/100th foot. All tabulated values on the field data sheet(appendix) are in decimal feet: After water drop was observed;the holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the ..bottom level of the percolation test hole:=Tlie-r- dings-were taken approximately every 30 minutes . for a period of four hours. - " ' 6.6 Percolation Test Forms and Results The completed percolation test forms-are included ix the appendix of this report. - A shallow percolation test is defined byahe EHD as being between 36 and 42 inches in depth;a satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. Details of the percolation tests are summarized in Table 11.