SR0080316 SSNL - Laserfiche WebLink

Home Browse Search

r"�NLS0 3.3, SSS§ 5.3,5.4. Table 1 below summarizes the soil physical and chemical characteristics at the 20" depth and four inches deeper than the proposed soil-effluent interface: TABLE 1 SOIL PROFILE CHARACTERISTICS AND ANALYTICAL TEST RESULTS SAMPLE DEPTH AND SOIL SOIL NITRATE- pH,CATION EXCHANGE (SAMPLE NUMBER ON CLASSIFICATION NITROGEN CONTENT CAPACITY,AND C:N RATIOS TEST RESULT FORM) 20"DEPTH Clay 4 ppm NO;N 8.1 35.0 meq/100g 19:1 40"DEPTH Loam 1 ppm NO -N 8.3 27.4 me /100 13:1 C. PERCOLATION TEST RESULTS SSS§ 6.2. To assess the permeability at the test depth which corresponds nearly with the soil- effluent interface,the percolation test boring was completed in the location depicted on APN map found in Appendix D. SSS§6.3. After drilling, the sidewall of the boring was scored with a pry-bar to open potentially smeared soil surfaces. Two inches of pea gravel was placed at the bottom and a three-inch perforated PVC pipe was inserted in the test boring. After these procedures, the boring was pre- saturated with 12 inches of water approximately 24 hrs prior to the start of testing. / SSS§ 6.4,6.5. On January 4, 2019,percolation testing commenced at 0900 hrs. No standing✓ water was observed after the 24-hr soak period. Consequently, EHD Perc Test Procedure#2 was conducted. Testing was done over a four-hour period to induce maximum soil saturation. Ce test result indicate a surprisingly slow perc rate given the loam soil structure at test depth, of 83.3 min/in. perc rate of 60 min/inch or faster is considered acceptable and a rate slower than this st have system designed and certified by a CA registered civil engineer. e project site is just over the line of demarcation from the"clay/seepage pit area"as denoted on the Septic System Requirements Soils Map and is located in the"sand/sandy area"where leachlines/sumps and filter beds are permitted. Consequently, I have designed leachlines and sum s for this project. Deeper perc tests were not conducted because the clayey,peat- Ike surface soils in� the proposed disposal area was too wet to support a large drill rig. �v A summary of the perc test results with corresponding application rates In gallons of effluent accepted per square foot of soil per day are illustrated below in Table 2: Page -3- Chesney Consulting