Laserfiche WebLink
Soil Suitability / Nitrate Loading Study <br />Morada Produce —Ag Processing Building it Stockton, California <br />May 14, 2021 a Terracon Project No. NA217014 <br />lierracon <br />approximately 24 hours prior to the day of testing. The depth of water used to pre-soak the <br />shallow boring was approximately 1.0 foot above the top of the gravel. <br />1.6.4 Condition of Borings after Presaturation <br />Borings B1 (25 feet) and B2 (23 feet) were dry and intact after the 24-hour pre-soak period. Boring <br />B3 (3 feet) contained water after the 24-hour pre-soak period and failed to percolate on the day <br />of testing. <br />1.6.5 Percolation Test Procedure <br />Percolation tests were conducted for the two deep borings (B1 and B2) on April 6, 2021 in <br />accordance with the requirements of the San Joaquin County EHD. Each percolation test had a <br />duration of four hours. The last half an hour of the test was observed by a representative from the <br />EHD. Measurement of the water level during the percolation tests was from a fixed reference <br />point on the PVC casing using a calibrated Solinst electric water level detector with a depth <br />accuracy of 0.01 feet. All tabulated values on the field data sheet (Appendix E) are in decimal <br />feet. After water drop was observed, the holes were checked for refill. The holes were refilled as <br />necessary to maintain approximately 0.5 feet (6 inches) of water above the bottom level of the <br />percolation test holes. The readings were taken every 30 minutes for a period of four (4) hours." <br />1.6.6 Percolation Test Forms and Results <br />A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth. <br />While a deep percolation test is defined by the EHD as being between 42 inches and 25 feet in <br />depth. The shallow percolation test must demonstrate a satisfactory percolation rate of less than <br />or equal to 60 minutes per inch drop in water level within the existing septic system disposal field <br />of a parcel to utilize a standard septic system and 30 minutes per inch or less for septic pits. <br />Details of the percolation tests are summarized in the table below. <br />Table 7. <br />Summary of Percolation Test. <br />Test No. <br />Date Tested <br />Percolation Test <br />Depth (feet) <br />Percolation Rate <br />(min/in) <br />Test Duration <br />(hours) <br />Comments <br />(see note) <br />B1 <br />04-06-2021 <br />25 3.12 4 Satisfactory <br />Percolation Rate <br />B2 <br />04-06-2021 <br />23 5.0 4 Satisfactory <br />Percolation Rate <br />B3 <br />04-06-2021 <br />3 0.0 --- Unsatisfactory <br />Percolation Rate <br />Note: A satisfactory percolation rate is 60 minutes per inch or less for shallow leach lines and 30 minutes per inch or less for septic <br />pits per San Joaquin County Onsite Wastewater Treatment Systems Standards (END 42-014), January 2017. <br />Responsive • Resourceful • Reliable 12