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11851 W. Valpico Rd, Tracy <br /> Page 2 <br /> • Most wells in the area were installed in the 1970's or earlier, are shallow in total depth, and may only <br /> have a 50 foot annular seal depth. General groundwater depths have been estimated to be <br /> approximately 100 feet below ground surface, but well and pump permit data show the static water <br /> depth in nearby wells to be around 50 feet below ground surface. These wells may be contributing to <br /> overall nitrate-impacted water table drawdown and may be acting as conduits for nitrate to infiltrate to <br /> groundwater. <br /> • Permit SR0042716 was issued in 2005 for a full OWTS replacement due to the failure of the existing <br /> OWTS. The permit shows a 1200 square foot filter bed was installed just north of the area of the failing <br /> dispersal field. The site plan submitted for the building permit does not show the area occupied by the <br /> failed dispersal field or the full area currently occupied by the replacement filter bed installed in 2005, <br /> as indicated on the permit. Taking this information into consideration, the site plan does not show <br /> adequate area for the full 896 square feet filter bed required for the proposed new two-bedroom <br /> dwelling or the associated 100% replacement area for both systems. Without an accurate, detailed <br /> site map, drawn to scale, it is uncertain if there is sufficient area for the required dispersal fields for <br /> both houses, including the required 100% replacement areas for both houses. <br /> In your December 5, 2018 email, you indicated you received information from EHD staff that only annual <br /> sampling of the onsite water well would be required for a second unit dwelling OWTS showing a potential <br /> nitrate impact to groundwater, and that the requirements had changed from the time you first received this <br /> information and when you completed the study required for the evaluation of the second unit dwelling OWTS. <br /> Please be advised that the requirement in the LAMP and OWTS Standards to mitigate nitrate impact from <br /> OWTS was effective in January 2017 and has not recently changed. The EHD cannot provide any relief from <br /> the expenses you mention in your email, but San Joaquin County has an established process for the submittal <br /> of claims. More information on this process can be obtained by contacting the Clerk of the Board's Office at <br /> (209) 468-2350. <br /> If you have any questions please contact Linda Turkatte, REHS, at (209) 468-3912 or IturkatteQsicehd.com. <br /> Linda Turkatte, REHS, Director <br /> Environmental Health Department <br /> c: Live Oak Geo Environmental, Inc. <br /> 407 W Oak St <br /> Lodi CA 95240 <br />