SITE INFORMATION AND CORRESPONDENCE

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Pennington Property— UIC Drug lab page 2 10285 N. Hildreth Lane, Stockton. • Complete, sign, and return the enclosed Master File Record (MFR) to SJCEHD with a check for $279 (starts and credits an account with 3-hours of oversight time) and, • Have a septic contractor pump out the contents of the septic tank immediately and hold the material onsite pending analyses by a professional. • Contract with an environmental consulting firm and submit a work plan to gather soil samples from under the septic tank, the distribution box, every 20-linear feet of each of the two leach lines, and the 'tight line' just before the two pits located at the end of each line. Soil samples are to be collected from native soil within 1 to 2-feet below the leach rock/filter material. Any sludge or liquid (inside or outside the lines, tank, D-box, etc) encountered during the investigation is to be sampled and analyzed. In accordance with USEPA guidelines for minimum laboratory analyses for UIC systems, SJCEHD will require the pumped contents of the septic tank in the holding tank to be analyzed for Total Petroleum (Extractable, Purgeable, and Recoverable) Hydrocarbons (Carbon range, C-4 to C-44) by EPA Method 8015m. Benzene, Toluene, Ethylbenzene, and Xylene - (BTEX) and a general scan of volatile organic compounds (VOC) by EPA Method 8260B, as well as Methamphetamine (HPLC/MS/MS), Chloride (EPA 300.0), pH (EPA 150.1). Detectable amounts of contaminants from the pumped septic tank will require the soil, sludge, and ground water samples required and described in the work plan to have similar analyses. • Submit a report of findings signed by a California registered professional to SJCEHD at the end of the septic system investigation. If soil/sludge/water sample laboratory data indicates that chemicals are detected at significant levels, an additional investigation may be required to determine the vertical extent of the chemical migration and if the ground water has been impacted. Also, if the soil samples from either leach line just before entry into the pits are contaminated, additional soil samples from below the 25-feet deep pits must be taken to verify if the contaminants have migrated down. The contents of the septic tank should be pumped out by a qualified contractor and the contents properly stored onsite immediately. The septic tank is then to be high-pressure water/steam washed and cleaned as many times as necessary to rid the tank of all materials and odors. This rinseate should be pumped out of the septic tank and added to the tank already holding the pumped septic waste. This can be done before the work plan is submitted to SJCEHD in order to minimize any impact to the soil around the tank should there be cracks in the tank.