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5708 Hwy 99, Stockton <br /> Page 3 - <br /> lines and seepage pits) that are connected to the septic tank. It is possible that the chemicals <br /> could leach from the soil surrounding the septic system components to the groundwater beneath <br /> the site. This groundwater is the source of the drinking water that is pumped from the on-site <br /> well and used by the people at the motel. <br /> The well that serves this facility was installed in 1940. It is very unlikely that the well is <br /> protected with a grout seal between the casing and the borehole wall, since it was not a <br /> requirement at the time the well was constructed. Although the depth to first water is currently <br /> below 60 feet, in the past the water table has been at 50 feet and perhaps shallower. At least two <br /> 60-inch diameter, 25 feet deep, seepage pits are part of the septic system that serves that portion <br /> of the motel. Therefore, there would only be 25 feet of soil or less between the bottom of the <br /> seepage pits and the groundwater. The direction of groundwater flow at service stations north of <br /> this site,near Hammer Lane, has been to the southwest. If contamination were to leach from the <br /> soil surrounding the septic system to the groundwater, and the groundwater flows southwest <br /> from the location of the septic system, the drinking-water supply well may become impacted by <br /> these chemicals in the future. All these factors, as well as the soil type,must be considered when <br /> evaluating the assessment required at this UIC site. <br /> Site-specific factors must be considered when assessing and recommending closure on all UIC <br /> sites. This is the reason that an appropriately registered professional, who has the education, <br /> experience, and credentials to provide opinions on subsurface hydrologic matters,must prepare <br /> the closure report. You have informed the EHD that you do not have these qualifications. <br /> It is important to understand that the EHD is not disputing the statements made in your letter <br /> dated December 4, 2004,regarding the volume of organic chemicals in the septic tank at the time <br /> a sample was collected from it, that the contents of the septic tank have been removed and there <br /> should be no remaining chemicals in it, and that the water from the well at the site is not <br /> currently impacted with the chemicals that were detected in the septic tank. However, the EHD <br /> is concerned that the drinking water supply at this site and others remains safe now and in the <br /> future. <br /> If you have any further questions,please contact me at (209) 468-3449. <br /> Donna Heran,REHS, Director <br /> Environmental Health Department <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br />