SITE INFORMATION AND CORRESPONDENCE_FILE 1

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U-Haul page 3 2701 N. Wilson Way, Stockton The SCM is a written description supported by maps, geological cross-sections, tables, and diagrams that provide information about the site. The SCM should include the following: 1. Local and regional plan view maps showing location of sources, extent of contamination (i.e., an interpretive drawing - not merely a plot of laboratory results), direction and rate of groundwater flow, and locations of receptors. "Receptors" include, but are not limited to, all supply wells within 2000 feet of the source area; 2. Cross-sections showing subsurface geologic features, depth of groundwater, man-made conduits, monitoring well construction, and an interpretive drawing of the vertical extent of soil contamination; 3. Plots of key chemical concentrations vs. time (e.g., plots should be shown for monitoring wells that demonstrate significant trends in contaminant concentrations); 4. Summary tables of chemical concentrations in different media; 5. Dissolved and adsorbed contamination mass estimates supported by calculations; 6. Boring and well logs (including construction/screening). If, in your consultant's determination, offsite borings/wells are to be placed to collect the required data, please start the process to gain access immediately. County encroachment permit applications have many requirements and can take considerable time to secure if not done correctly. Private parcel owners should be contacted immediately if your consultant determines that access to their property is needed. Delays in defining the extent of your UST release (drilling) by not securing access agreements or municipal encroachment permits in a timely manner are unacceptable and may result in formal action from EHD. With a drinking well impacted and others endangered, characterizing the extent of this UST site's impact and abating it is imperative. U-Haul is to take aggressive measures to complete their investigation, evaluate interim remedial actions, and conduct remedial actions to return the beneficial aquifer to pre-release conditions. You may contact Michael Infurna at (209) 468-3454 if you have any questions. Donna Heran, RENS, Director Envir nmental He io Michael J Infurnk Jr., S for REHS Margaarr t Lagorio, RENS LOP / Site Mitigation Unit IV Supervisor MI/ c: CVRWQCB — James L. Barton, Sacramento. c: SWRCB CUF — Mark Owens, Sacramento. c: Blaes Environmental Management — Brett McDaniel, 202 E. Earl Dr., Phoenix, AZ. 85012.