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welow�_ October 5, 2020 FOR: Mr. Juan Carlos Piedra P.O. Box 8791 Stockton, CA 95208 209-292-1210/jc.piedra@yahoo.com PROJECT: Proposed Single Family Residence 8150 Foppiano Ct. Stockton, CA 95212 APN 086-710-01 SUBJECT: Soil Percolation Testing Report for Onsite Wastewater Treatment System (OWTS) Effluent Disposal. Project Number ST-70.20 INTRODUCTION Chesney Consulting has been retained by Mr. Juan Carlos Piedra to conduct soil permeability (percolation) testing at the above-referenced project site. The purpose of this testing was to determine the permeability of the underlying soils in the proposed location of effluent disposal from the Onsite Wastewater Treatment System (OWTS) for his proposed new house. Additionally, information from the percolation test results has been correlated with the effluent disposal volume the receiving soils can manage. Soil test locations were determined by the location of the disposal area as illustrated on plans drawn by Rodrigo Mendez. The domestic well for this project is in the installation process, at the north property line. There have been no other improvements made to the property as of the date of this Report. MATERIALS AND METHODS On September 30, 2020, the soils investigation began by boring a 25-ft test hole with a B-24 Mobile Drill Rig and solid stem auger to log soil characteristics to this depth. This 25-ft depth represents the maximum depth of a seepage pit and the location of this project is considered by the Environmental Health Department (EHD) to be in an area where seepage pits can be installed. From the lithology data obtained from this 25-ft test boring, two separate perc tests borings were prepared; one shallow test boring and one medium depth test boring. The shallow 38" test boring represents permeability at typical leachline depth. The sidewalls of this test hole were scarified with a pry bar to open potentially smeared soil surfaces. The second boring was completed to 180" (15 ft) depth and the third test boring was set at 300" (25 ft) deep. The borings were sleeved with 3" slotted PVC pipe to mitigate potential cave-ins and as the reference measuring point. Two inches of gravel was placed at the bottom of each test boring to prevent scour. The borings were pre-saturated with 12" of water approximately 24 hrs prior to testing. On October 2, 2020,percolation testing commenced. An electronic water level meter was used to measure the water drop every 30 minutes over the four-hour test period. The last half hour of testing was witnessed by Aaron Gooderham, EHD sanitarian. Page 1 of 3 P.O. Box 3794 ❑ Turlock,CA 95381 ❑ 209.402.1652 ❑ ddchesngy(a charter.net