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F EHD Onsite Wastewater Treatment Systems Standards reference "Leach Lines and Sumps upft depth to have a Setback Requirement of 50 ft from Private Water Wells for Existing,Non- forming OWTS (Lots Where OWTS Cannot Meet Tier 1 Requirements)." For all other OWTS,etback requirement is 100 ft. The setback distance was 50 ft up until 2011, when the distance was increased to 100 ft. The San Joaquin County Well Standards reference a Disposal Field and Leaching Sump < 8' deep setback to be 50 ft for Lots recorded before 1972. The subject property is considered an Old Lot of Record. If EHD requires a 100 ft setback between private domestic wells and the filter bed and < 8 ft deep sump,then a variance is requested under Section 11.1 of the Onsite Wastewater Treatment S sty ems Standards, which states that"the property owner of an OWTS that cannot meet a provision of the minimum requirement of these standards may apply for a variance of that provision." Of significant importance, is the fact that the domestic wells discussed above are either upgradient, or cross gradient to the proposed OWTS. Downgradient domestic wells on the east side of Patterson Avenue are outside the 100 ft radius from the proposed OWTS. Water use in the proposed SFR must be kept to a minimum. The new CA Water Fixture Standards must be installed in the new SFR to assist in keeping water usage to a minimum. It is my professional engineering opinion, that the proposed project has an infinitesimal possibility of increasing the underlying groundwater with a nitrate concentration above the MCL. This is based on the data collected and the engineering design factors to be implemented. Page -7- Chesney Engineering, Inc.