Laserfiche WebLink
Soil Profile And Percolation Tests Sheet 4 of 4 <br /> Well Water Analysis : <br /> There is a domestic well on the east side and <br /> immediately adjacent to the garage to the north of <br /> the existing house. The domestic well water was <br /> sampled and tested for the chemical <br /> Dibromochloropane (DBCP) and nitrates (\'03) and <br /> found to be 2 .06 ug/L and 57 mg/L, respectively. <br /> The well water analysis was performed by FGL <br /> Environmental and is shown on the attached letter <br /> dated March 1.1 , 1991 . These results exceed the <br /> safe standards for DBCP and nitrate concentrations <br /> established by San Joaquin County for these <br /> chemicals at 0 . 20 ug/L and 45 mg/L. Special <br /> requirements and considerations will be required to <br /> provide safe standards on any proposed future well <br /> installations because of the already impacted <br /> ground water . <br /> The property- owner , fir . Robert Mathias believes his <br /> well was dug to 110 feet below the ground surface <br /> but does not know the precise level the water is <br /> being extracted at . Some special requirements and <br /> •considerations that would appear appropriate, but <br /> not necessarily limited to , for any future well <br /> installations would be the following: <br /> ( 1 ) A filtering system using a Granulated <br /> Activated Filter (GAF) to prevent high <br /> nitrate concentrations is recommended. <br /> (2) To mitigate the high DBCP concentrations , <br /> digging a deeper well and extracting the <br /> water from a lower elevation and/or <br /> grouting or other appropriate measures <br /> to try to seal the DBCP from entering <br /> into the well are recommended. <br /> Enzineer ' s Statement : <br /> The percolation rates of 10 . 0 and 8 . 6 minutes per <br /> inch determined for Test Hole Nos . 1 & 2 <br /> establishes the need for a 8 , 000 sq . ft . minimum <br /> usable leach field area . A leach field facility can <br /> be safely installed to the density proposed without <br /> impacting ground water or causing health problems <br /> in the future. <br /> However , special requirements are necessary for any <br /> proposed wells to prevent further impact to the <br /> ground water and not cause any health problems in <br /> the future as referred to in the text of this <br /> report under "Well Water Analysis" . <br /> Walter E. Curtis <br /> Attachments : <br /> Parcel Map <br /> Field rote Sheet . (1) <br /> MS-91-80 --- Robert Mathias <br />