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MAY_3 0 19y5 Di Sa1vo-1.ahm <br /> May Is. 199. <br /> ENVIRONMENTAL HEALTH PW-z <br /> PROPOSED AMENDMENTS PERMIT/SERVICES <br /> The Di Salvo - Lathrop site is located immediate) southeast of the Sharpe Army Depot. <br /> According to SJCPHS,EHD, the groundwater gradient at the Sharpe Army Depot is consistently <br /> toward the northwest. Based on the consistency of the Sharpe Army Depot groundwater gradient and <br /> the close proximity of the Sharpe Army.'Depot to the Di Salvo - Lathrop site, Condor proposes to <br /> install one (1) two-inch diameter monitor well approximately 10 feet northwest of the east end of <br /> TK4. The monitor well borehole will be drilled using 8-inch O.D., continuous-flight, hollow-stem <br /> I� <br /> augers. The proposed monitor well location is shown in igure 2, attached. <br /> The proposed monitor well location is at the former location of TK5, which was located <br /> north of, and adjacent to, TK4. The bottom of TK5 was approximately 11 feet below the ground <br /> surface (bgs). In early 1995, the tank excavation was backfilled with clean soil. Condor proposes to <br /> collect soil samples during the drilling of the 2-inch diameter monitor well beginning at approximately <br /> 11 feet bgs. Soil samples will be collected continuously thereafter until the capillary zone is <br /> encountered. Condor expects the capillary zone to be en untered at the Di Salvo - Lathrop site at a <br /> depth ranging from 14 to.17 feet bgs. The bottom-most soil sample collected from the capillary zone <br /> will be retained for laboratory analyses;- <br /> The <br /> nalyses:The soil sample collected during installation of th monitor well and subsequent groundwater <br /> samples will be analyzed in accordance with the SJCPHS EHD approved amendments to the work <br /> plan. Condor proposes the detection limits listed in Table 1 for laboratory analyses of the respective <br /> samples. The detection limits listed in Table 1 are the detection limits recommended in the Tri- <br /> Regional Board Staff Recommendations!for Preliminary IMduation and Investigation of Underground <br /> Tank Sites, August, 1990. <br /> TABL 1 <br /> Laboratory Det rAion Limits <br /> B T E X TEPH <br /> Kerosene Diesel Motor Oil <br /> SOIL 5.0 5.0 5.0 5.0 1.0 1.0 10.0 <br /> uglkg Jig/kg ggtkg pgtkg mg/kg mg/kg mg/kg <br /> WATER 0.5 0.5 0.5 0.5 0.05 0.05 0.5 <br /> Jg/1 µg/1 Ag1I kgll mg/1 mg/1 mg/1 <br /> a� CONDOR <br />