SITE INFORMATION AND CORRESPONDENCE

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T & T Trucking page 3 11396 Hwy 99 Frontage N, Lodi Wellhead treatment is expensive and should not be considered as your first option for a long-term solution. A permanent solution for a severely impacted well or for a well destabilizing a.plume of impacted groundwater would be to remove the 'supply well' and replace it with another well further from the petroleum plume and constructed with inlet screening at depths below the petroleum plume, but not less than 200 feet below the surface. With the highest concentration of MtBE on the site only recently detected in MW-1, EHD is concerned that the greatest impact to the groundwater from the UST release may not have been encountered yet. As dissolved MtBE in the groundwater continues to migrate, the 'supply well';. remains vulnerable to potential future impact. Any changes from the current use of the 'supply well', such as a drop of groundwater elevation due to drought conditions, an increase in number of family , members, or an increase in commercial truck use or agricultural use of the groundwater could accelerate the contaminant migration, modify the groundwater flow beneath the.site, and degrade the drinking water quality entering the 'supply well'. Although private domestic drinking water wells are not regulated by EHD, you should know that consumption of petroleum impacted water is a real danger to your health and EHD would recommend that the 'supply well' be removed and replaced if petroleum constituents were repeatedly detected. San Joaquin County Well Standards require that wells are to serve the purpose for which they were installed. The "unused" well is to be either brought 'on-line' and utilized as the production well it was installed as or is to be properly destroyed under permit and witness of EHD. Please confirm your intentions immediately. y (4) Identification of other nearby receptors; A sensitive receptor survey that identifies receptors (wells, surface waters or basins, septic systems, etc) within 2000 feet of this site should be conducted. Driller's logs, well completion designs, and water production data should be reported if available. All drinking water wells identified within the area of the petroleum plume or suspected to potentially'be impacted by the plume should have groundwater samples collected and analyzed for the petroleum constituents listed below. EHD recommends you obtain access agreements from the property owners prior to having your consultant collect the samples. Please include the results of the survey in a report due at EHD within 90 days. (5) The placement of additional monitoring wells at and around the site. Based on the driller's log for the 'supply well',, sampling to 130-foot depth would include an investigation of a potential aquitard and a deeper potential aquifer unit and may be adequate to demonstrate vertical delineation of impacted groundwater. "Grab" groundwater samples should be, collected from the more permeable hydrological units identified by the CPTs and should be analyzed for total petroleum hydrocarbons as gasoline and diesel (TPHg and TPHd), BTEX,