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Percolation Test <br /> Shimmick Construction ■ Stockton, California ����a�on <br /> April 7, 2017 ■Terracon Project No. NA177012 <br /> On March 14, 2017, a percolation test boring (P1)was advanced on the southern <br /> nlp oboe feet south of <br /> the site <br /> approximately 200 feet west of the storm water retention basin and approximately <br /> an existing fence (refer to Attachments, Exhibit 2 for location). The location of the test was identified <br /> on a site diagram provided by Mr. Greg Moeller of Shimmick Construction. <br /> The percolation test was performed to determine the permeability of the soils for the suitability of <br /> on-site sewage disposal and was conducted in accordance with Section 9-1105.2(d) of the San <br /> Joaquin County Development Code. A four inch diameter hand-auger soil boring (P1) was <br /> advanced to approximately 42 inches below ground surface (bgs), and filled with approximately two <br /> inches of pea gravel. A 2.0-inch diameter PVC pipe with perforations towards the bottom was <br /> installed on top of the gravel and the annular space was backfilled with pea gravel. Soils appeared <br /> to consist of moist brown clay loam soils which continued to the full depth of the boring. The boring <br /> was pre-saturated with twelve inches of water approximately 24 hours prior to the day of testing. <br /> After the 24-hour soak period, the boring was found to be intact and dry on the day of testing. The <br /> percolation test was conducted on March 15, 2017 in accordance with the requirements of the San <br /> Joaquin County EHD. The percolation test had a duration of four hours and was observed by Mr. <br /> Ted Tasiopoulos, Registered Environmental Health Specialist (RENS). <br /> Measurement of the water level during the percolation test was from a fixed reference point on the <br /> PVC casing using a calibrated Solinst electric water level detector with a depth accuracy of 0.01 <br /> feet. All tabulated values on the field data sheet are in decimal feet. A copy of the field data is <br /> included in the attachments. <br /> Observations of the shallow soils from the test hole are indicative of relatively low permeable soil <br /> conditions for septic disposal given the clay content present. These characteristics allow for slow <br /> to moderate seepage or percolation. Generally speaking, coarse-grained soil has a greater <br /> potential for percolation than fine-grained. <br /> The completed percolation test form with Ted Tasiopoulos's REHS verification signature is included <br /> in the attachments of this report. A shallow percolation test is defined by the EHD as being between <br /> 36 and 42 inches in depth. While a deep percolation test is defined by the EHD as being between <br /> 42 inches and 25 feet in depth. The percolation test must demonstrate a satisfactory percolation <br /> rate (less than or equal to 60 minutes per inch drop) within the existing septic system disposal field <br /> of a parcel to utilize a standard septic system. Details of the percolation tests are summarized in <br /> the table below. <br /> Responsive ■ Resourceful ■ Reliable 2 <br />