SU0003871 SSNL - Laserfiche WebLink

Home Browse Search

r February 3,2005 NOA Project Number: E040116A 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 holes occurred on February=l,2005. The depth of water used to pre-soak 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 February 2, 2005. All of the holes were found to be dry,while standing water was observed in the shallow holes. 6.5 Percolation Test Procedure Percolation tests were conducted for the borings on February 2, 2005 in accordance with the requirements of the EHD. A percolation test with a duration of one hour was performed for each hole. The final half-hour of each four-hour percolation test was observed by Ms. Lisa Medina, Registered Environmental Health Inspector, EHD. Measurement of the water level during the percolation test was from a fixed reference point on the PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All tabulated 4 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 f., bottom level of the percolation test hole. The readings were taken approximately every 10 minutes 4 for a period of one hour. 6.6 Percolation Test Forms and Results The completed percolation test forms are included in the appendix of this report. A shallow percolation test is.defined by the 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. One percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field of each parcel. Details of the percolation tests are summarized in Table 9. Rl 9 F