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In summary,the soils testing and investigation has found the indigenous soils under the proposed domestic wastewater disposal area to contain a predominately fine-grained,dense silty clayey material with slow percolation/permeability characteristics,but high denitrification potentials. Under EHD requirements and regulations,a mound system for effluent disposal is required for this project due to the high clay content soils and shallow groundwater table. A custom designed and built q (4) pump system will rotate between pump on-off cycles to pressure time-dose effluent among four arate cells and distribute effluent equally through the mound basal area. The mound system i desc ' d in detail in Section IV of this Report. Although the test results show marginal permeability with effluent acceptance rates above 0.235 gal/ft2/day but below 0.472 gal/ft2/day,permeability will likely decrease within the indigenous soils to a Long Term Acceptance Rate(LTAR)of 0.2 gal/fV/day. Design parameters have taken this eventual decrease in — infiltration permeability into account by increasing the mound basal effluent disposal area above what has been determined by the calculated Average Daily Flow(ADF). II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION The subject property consists of a 20-acre parcel which has been the Gurdwara Gur Nanak Parkash(Sikh Temple)for the past two decades. Presently,the Temple consists of one residential structure(referenced as the west house)and another residential structure(referenced as the east house)that also serves as an office/administration building. An Assembly Hall is to the north of the east house where meetings and cooking take place. A metal Butler Building is on the west property border,between the south and north property lines. There is a large domestic water well directly southeast of the metal building that serves both houses and the Assembly Hall. -c_ _omadl-' ed—sh�ltis in the front yard of the west house. This well is currently unused but can be used in emergencies. Current domestic wastewater management is as follows: The west house has a septic tank of unknown size. Effluent from this tank gravity flows northeast in a 6" line to the middle tank of three existing 2,000 gallon septic tanks,directly northwest of the Assembly Hall. A new 1,600 gallon tank is to be installed for this west house at the beginning of the expansion plans. The east house/office does not have a septic tank, so influent gravity flows in a 6"line also to the middle septic tank. Clean-outs are located on this tightline. Kitchen effluent from the Assembly Hall flows into the first tank of the three,which is a grease interceptor tank. Restroom wastes from the Assembly Hall also flow into the second septic tank. The third tank provides additional treatment,with the second chamber acting as the pump chamber with a duplex pump system to pressurize the existing mound system. The referenced metal building on the west property line does not have restrooms and therefore no septic system. _ Expansion plans will consist of the construction of a new Assembly Hall(Darbar Hall),and a n itchan . Dining and Retreat Hall(Langar Hall). All other referenced existing buildings will remain. Surroun mg ` land use to the north,south and east is and has been,in agricultural production for many decades. Two miles to the west is the new community of Mountain House. As noted on the San Joaquin County Parcel Viewer Maps,the current surrounding land use is composed primarily of agricultural production land. 2