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F O e q a NEIL O. ANDERSON & AS SOCIA TES, INC. GEOTECHNICAL•ENVIRONMENTAL.•GROUNDWATER•INSPECTIONS•TESTING•LABORATORY SERVICES F V, w RSM: w .mandersom. CORPORATE OFFICE SACRAMENTO OFFICE Z W EU : noaQmande� mo 22 Housmn lane 4221 Northgate Boulevard,Suite 6 MCO: (DO)89"IN lath,California 95240-2405 Sacramento,Califonua 958341227 '`rSOL\r STDCR N: (2 )4724991 (209)367-3701 (916)929-9267 w MOCOR VA: (916)631-4455 FA):(209)333-8303 M:(916)929-9269 January 29,2003 Mr.Richard Dewhurst P.O. Box 676 Clements,CA 95227 Re: Proposed Engineered Septic System Revision Richard Dewhurst Residence(PA-02-55) 28335 N.Mackville Road Clements, CA 95227 Dear Mr. Dewhurst, Per your request,our office has reviewed our calculations regarding the"doubled"engineered septic system design for the subject property originally prepared by our office. We understand you are the new owner of the subject property. Our understanding with San Joaquin County Environmental Health Department(EHD)staff is your parcel has been approved for an engineered septic system. An engineered septic system is allowed by EHD to mitigate slow percolation rates and/or other problematic situations. Slow and unsatisfactory percolation rates were measured within the proposed disposal field area on your parcel (parcel no. 1)during a Soil Suitability Study for Minor Subdivision Application No.PA-02-55 last year. We understand the address for parcel no. 1 is now 28335 N.Mackville Road,Clements,California. The approved engineered septic system for the subject site was sized by our office for a 3 bedroom residence and then"doubled"in absorption area to provide EHD staff with additional factor of safety and to respond to their concerns regarding the poor soil conditions in the area. Upon review,this letter proposes a revision to our engineered septic system plans. Since you have indicated that you are willing to accept additional risk by means of eliminating the requirement of the "doubled"septic system,we will provide you with an engineered septic system plan for a"primary"or "single"septic system sized for a 3 bedroom residence which could eventually be constructed into a doubled system if needed. Should any future septic system repair(leach field expansion)be required due to underestimated or poor soil conditions,you will be required to complete a portion of,or complete the fully"doubled"septic system which was approved by EHD. Essentially,we are proposing that you can build half(primary system)the system now. If the primary system has performance problems because of soil—complete a portion of,or the fully"doubled"design. In order for our office to proceed with this approach,you need to understand and assume the potential risks involved. Some of the risks involved are the inconvenience and cost associated with septic system repair which often includes adding leach lines and seepage pits. Should the property be sold,this agreement will need to be disclosed.