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Former Columbo/Toscana B�-`-ry - 2 - 12 October 2007 <br /> 1444 S. Lincoln St., Stocktoi <br /> 1426 S. Lincoln St. submitted in August 2007) exist for your site. The 508 W. Charter Way <br /> SCM is located in our file, and the 1426 S. Lincoln St SCM may be downloaded electronically <br /> from Geotracker. <br /> 3. On the contrary, the SGIR should have identified the data gaps in the present investigation and <br /> recommended submittal of a workplan for an additional investigation to fill those data gaps. <br /> SGIR Figures 8 and 9 cross sections show that source area soil contamination was not defined <br /> below 35 feet bgs in borings C4 and C5, while source area groundwater pollution is not defined <br /> by the deepest monitoring well (MW-7D) at 75 feet bgs. A CPT-1 grab groundwater sample <br /> was non-detect at 125 feet bgs. SGIR isoconcentration map (enclosed Figure 5) shows the <br /> known lateral extent of the groundwater pollution. Therefore, you are to submit a workplan to <br /> further define the vertical and lateral extent of petroleum hydrocarbons in the soil and <br /> groundwater by 23 November 2007. The report of the additional investigation will be integrated <br /> into a Feasibility Study or a Remediation Evaluation, which is discussed below. <br /> 4. The SGIR results show considerable mass of petroleum hydrocarbons in soil reside in the <br /> source area above the water table. And groundwater concentrations reported in the SGIR and <br /> 302007MR significantly exceed several of the Waterboard's Water Quality Goals by up to <br /> orders of magnitude. Although the complete extent of your identified plume has not been <br /> determined, sufficient data exists to initiate remedial activities. As such, an active remedial <br /> action is necessary to reduce mass in the source area. As such, you are to also submit a <br /> proposal for soil and groundwater remediation, as either a Feasibility Study or a Remediation <br /> Evaluation, by 1 February 2008. Include the results of the additional investigation in said <br /> document. <br /> If you have any questions, please call me at (916) 464-4615 or email me at <br /> jbarton@waterboards.ca.gov. <br /> James L. L. Barton, P.G. <br /> Engineering Geologist <br /> Enclosures <br /> cc: Ms. Jennifer Jordan, State Water Resources Control Board, Sacramento <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Edward Overton, P.O. Box 417, French Camp 95231 <br /> Mr. Paul Anderson, PSC Environmental Services, 210 W. Sand Bank Rd., Columbia; IL 62236 <br /> Mr. Thomas Neely, ETIC Engineering Inc., 2285 Morello Ave., Pleasant Hills 94253 <br />