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2-10-200 1 -45R l 7pcf-i P- 2 SUMMARY On February S, 2000 a field observation was inade to determine the proper procedure to ascertain the adequacy of the existing soils to support on-site septi4 systems. Several exploratory holes were dug with hand auger or post hole digger. The fallowing summary is shown for each parcel: PARCEL .HOLES DUCT DEPTH TO R(7CK REMARKS 1. Two 6-12" Refusal at 12", Clayey lown,moist 2- Two 6" Unable to dig beyond 6",Moist clay 3. One 18" Refusal at 18 ,water entered hole. 4- Oue 6" Refusal,moist clay 5. One 12" Existing home on site. 6- One 30" Sd.CI.Si., Slightly moist. The existing cobbly loam and bedrockjsee soil survey attached from UC Davis, Soil Conservation Service,USDA;i except Parcel 6, indicate the need for a field investigation for each lot to determine where the effluent can best be disposed of Parcel 5 has an existing septic systenn on site. Parcel 1-4,will need to be individually designed based on where the residence is to be located. Parcel 6 has acceptable soil strata,at leastin the area observed_ This lraicel is 20 acres_ Parcel 14 are 80 acres each. The photographs show standing water on Par. 3 and Par. 5. This is typical of the area where the hardpan or bed rock is 10-20"from the surface. In photorgaph number 2 the water enters the roadway from the adjacent parcel. Seepage occurs f>r'oin the higher terraces. (Typical for Par.3 and 5)To avoid the effluent from being tramgvrted along the top of the bedrock and entering the runoff,selected areas must be located or constructed that will provide adequate disposal. To find a spot that will percolate within the acceptable range does not provide any assurance of containment in this type of terrain. Bedrock must be determined and also the slope,if any, should be examined. This process is best cone after the owner selects the residential location on the parcel, It is possible to pump the effluent for a long distance, in several directions,but to search out a possible location on an 80 acre par-cei at this time,does not appear to be productive or warranted in this type of terrain. Design of a system is based in part by the quantity of effluent, which is unknown. It is requested the map process be permitted to continue and the standard remark be placed on —11ye-map pe_ lnln o an englrleere�S t1C SyStG17l. Earnest F. Smith,P.E.