SITE INFORMATION AND CORRESPONDENCE

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15420 Hwy 4, Stockton Page 2 The characteristics of your site (depth to first water over 100 feet below surface and low percolation rate) and the low concentrations of contaminants in the samples from the contents of the septic tanks, provide justification for deviation from the EPA guidelines for investigation of a UIC site. Therefore, EHD provides the following guidance for investigation and closure of this case: • The septic tanks contents must be removed and disposed of appropriately. • EHD staff must be able to visually inspect the tanks for cracks or leaks prior to further use of the tanks. Further site investigation would normally require collection of soil samples from beneath the tanks and leach lines. The soil samples would be analyzed by a certified laboratory for Volatile Organics using EPA Method 8260, Total Petroleum Hydrocarbons (TPH) as gasoline using EPA Methods 5030/8015 and TPH as diesel using EPA Methods 351018015. Given the characteristics of this site and contaminant concentrations, an alternative investigation would be: • Provide a site map with the location of all wells on the property identified. • Obtain a water sample from the well closest to the septic tanks and have it analyzed by a State certified laboratory for Volatile Organics using EPA Method 524.2 and TPH as gasoline and diesel using the DHS LUFT Method. A plan describing the chosen investigation alternative must be submitted to the EHD by an environmental consulting firm. After completion of the investigation, a report and evaluation of the findings must be signed by an appropriately registered professional (R.G. or P.E.) and submitted to the EHD. Enclosed is a master file record form that is to be completed and submitted with a fee of$279 that covers the first three hours of our work on the site ($93/hour). If more than three hours is spent on oversight of the site investigation, you will be sent a bill calculated by multiplying the $93/hour fee times the number of additional hours. The master file record form and $279 should be submitted with. the plan from an environmental consultant. If you have any questions contact me at (209) 468-3449. Donna Heran, REHS, Director Environmental Health Department Margaret Lagorio, Supervising REHS Unit IV Enc.