Laserfiche WebLink
T <br /> U <br /> R. k <br /> JD Service Station —August 23, 2005 Page 2 <br /> could be a difference in permeability of the soil beneath filter bed#1. The water level in <br /> filter bed#3 was always lower than the water level in filter bed#2, which was also <br /> always lower than the water level in filter bed #1 it was concluded that there was no <br /> leakage between filter beds. The cause of the problem was concluded to be a difference <br /> in permeability of soil beneath filter bed 41. During the course of construction due to a F <br /> mix up in design drawings the area beneath filter bed#3 and a part of filter bed 92 had <br /> been excavated to 6 feet below ground surface for the storm water retention pond. The <br /> areas were subsequently backfilled to correct this mistake and the impermeable area from <br /> the bottom of the filter bed between about 30 inches below ground surface <br /> been eliminated in filter bed 43 and a part of filter bed#2. to 6 feet had <br /> Action to be Taken <br /> The MicroSeptec systems and associated filter beds are oversized for the flow rate being <br /> generated on site. It is, therefore, recommended that a bypass valve be installed in the lift. <br /> station and regulated to reduce flow to unit#1 and filter bed ##1 such that the flow can be <br /> limited to insure no filter bed leakage. This valve was installed during system inspection <br /> on August 23, 2405 and unit 41 restarted. See sketch#3_ <br /> If you have any questions please contact me at(209) 482-7769. <br /> Sincerely, <br /> . & <br /> H. B. Dietz <br /> HBDIgwd <br /> Distribution: Lisa Medina, San Joaquin County Environmental Health Department <br /> We Huggins, SJC EHD <br /> i <br /> i4 <br /> f <br /> f <br /> r <br /> k i <br />