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Page 3 1003T-GEO lowing a sand filter in lieu of the chamber described in OAR NATIVE BACKFILL ESTABLISH "MIN.COVER VEGETATIVE Chapter 340 Division 71. Construction shall conform to all COVER OR PER CODE requirements described within Chapter 340 Division 71 with the following modifications: 1111.111111 4" RFORATED 0 PIPEPE a. The perforated pressure piping shall be placed FILTER FABRIC within the 4-inch diameter perforated polyethylene 15" piping with orifices at the 12 o'clock position. ! , . , , 10"EZflow b. Because the top of the bundle will be at the 24"MIN. BUNDLE(TYP.) capping TRENCH ground round surface, a ca in fill shall be used WIDTH to cover the installation. Soil texture from the surface Figure 3 to the trench bottom shall not be finer than silty clay trench. For example, if the sizing for a 2-foot gravel trench loam. requires 100-linear feet of trench, the 1003T system will be sized at 100-linear feet. See the Oregon Chamber Design and Installation Manual for ad- ditional options and information. The Capping Fill System The 1201 P/1201 P-GEO Seepage Trench System The 1201 P-GEO drainfield system consists of one, 12-inch 10045/1004S-GEO, 1204S/1204S-GEO diameter bundle installed in a 12-inch wide trench. See figure Both the 10-inch and 12-inch diameter bundles may be in- 1 for example configuration. stalled in seepage trenches in lieu of drain media. Four or more bundles can be placed in a 24-inch wide trench.At least The 1202H one of the top bundles shall contain perforated piping. Serial The 1202H drainfield system may also be installed in a hori- distribution methods limit the maximum effluent depth to no zontal configuration in a capping fill system, within a 24-inch more than 6-inches higher than the invert level of the perfo- wide trench that is a minimum of 12-inches deep. See figure rated piping within the higher trenches.The minimum backfill 2 for example configuration. depth is 6-inches when equal distribution methods are used, and 12-inches with serial distribution methods. See Figure 5 The 1003T for example configuration. The 1003T drainfield system may also be installed in a cap- 1204S-GEO ping fill system. The 1003T in the horizontal configuration is A'�ESTAinstalled in a 30-inch wide trench that is a minimum of 12- VEGETATIVE VEGETATIVE COVER inches deep.The 1003T triangular configuration is installed in k, ,, „,,. + ,,,,, a 24-inch wide trench that is a minimum of 17- inches deep, NATIVE BACKFILL 6"MIN. FILTER FABRIC COVER OR PER CODE with the cap placed in accordance with the requirements of OAR Chapter 340 Division 71. See Figure 3 for example con- 4"PERFORATED PIPE figuration. 24" , 12"EZflow BUNDLE(TYP.) Conventional Sand Filter System Using Gravelless Absorption Trenches-The 1001 P/1001 P-GEO ' 24"MIN. The 1001 P/1001 P-GEO drainfield system (10-inch diameter TRENCH bundles containing 4-inch diameter perforated polyethylene WIDTH Figure 5 piping, placed end to end within the trench) may be used fol- 1001P-GEO - eep Slope Systems I00IA/1001A-GEO, 1001 P/1001 P-GEO NATIVE ESTABLISH 1201A/1201A-GEO, 1201 P/1201 P-GEO BACKFILL VEGETATIVE Both the 10-inchand 12-inch diameter bundlesbe CAPPING FILL COVER MIN. may used within seepage trenches in a steep slope system in FILTER FABRIC lieu of drain media. Four bundles can be placed in a 24-inch wide trench. At least one of the top bundles shall contain the perforated piping. Serial distribution methods limit the maximum effluent depth to no more than 6 inches higher 1f° 4"PERFORATED PIPE �;?1_: than the invert level of the perforated piping with the high- trenches. GEO product can only be used at the top of t.- ;,_,c;;t�_KL.. 10"EZflow 10"MIN. BUNDLE(TYP.) configuration. See Figure 5 for example configurati.-. TRENCH WIDTH Figure 4 Contact Infiltrator Systems'Technical Services Department for assistance at 1-800-221-4436