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Mr. Joel Weiss <br /> September 28, 1995 <br /> Page 2 <br /> Composite samples of soil were collected from the existing stockpiles to characterize the <br /> waste. The extractable concentration of lead (Waste Extraction Test [WET] with citrate <br /> leach) in stockpile samples were consistently in excess of the California soluble threshold <br /> limit concentration (STLC) of 5.0 milligrams per liter (mg/Q. The extractable concentration <br /> of lead (Toxicity Characteristic Leaching Procedure [TCLP]) in a separate composite sample <br /> from the stockpiles was less than the concentration (5.0 mg/L) defining a Resource <br /> Conservation and Recovery Act (RCRA) waste. Based on these stockpile characterization <br /> results, the existing stockpiled soil will be loaded and transported by rail to the East Carbon <br /> Development Corporation (ECDC) landfill in Utah for disposal. Loading and transport of <br /> the impacted soil is scheduled to occur within the first two weeks of October. The third <br /> period of excavation will begin immediately after removal of the existing stockpiles. <br /> Four small areas of excavation occur within the narrow strip of land between the railroad <br /> tracks and Sixth Street. The concentration of total and/or soluble lead in one or more floor <br /> and/or sidewall confirmation samples from three of the four areas are slightly in excess of <br /> agreed upon cleanup levels (220 milligrams per kilogram total lead; 0.015 mg/L soluble lead <br /> by WET with a deionized water leach). Additional excavation in these areas is physically <br /> constrained by the proximity to Sixth Street and the railroad tracks and the fact that a fiber <br /> optic cable and a pressurized natural gas pipeline underlie the strip of land in question. It is <br /> also noted that residential development will not occur within this strip of land. Given these <br /> conditions, and as stated in our telephone discussion of September 21, 1995, it is the <br /> understanding of SPTCo and IC that the Regional Board will not require further excavation <br /> in any of these four areas. <br /> The third monitoring well for the site has not been installed to date. This monitoring well <br /> will not be installed until after completion of all excavation, removal of all stockpiled soil, <br /> and any backfilling of excavated areas and regrading of the site. Delaying installation of the <br /> well until all of these site activities are complete assures that the new well will not be <br /> damaged by the heavy equipment movement typical of these activities. <br /> The next round of ground water monitoring for the site is scheduled for September 29, 1995. <br /> Ground water will be sampled from the two existing monitoring wells. Analytes for this and <br /> any future monitoring will include total petroleum hydrocarbons (EPA Method 8015 <br /> modified), aromatic volatile organics (EPA Method 602), halogenated volatile organics (EPA <br /> Method 601), semivolatile organics (EPA Method 8270) and the following metals: barium, <br /> cobalt, chromium, copper, lead (not detected in previous monitoring; <0.005 mg/L), <br /> vanadium, and zinc. Per our telephone discussion of September 21, 1995, the following <br /> analytes will be deleted from the ground water monitoring program for Old Tracy Yard: <br /> general inorganics, general minerals, and any of the California Assessment Manual (CAM) <br /> 469-013.Itr/09-28-95/u/kwrigh/keydata/oldtracy/letters <br />