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MAY-1.9-95 FRI 16:38 CONDOR EARTH TECH 'FAX NO. 2095320773 P. 03 <br /> a <br /> . mi l�hro•tat��yar <br /> May 19,,Ift <br /> MOPOSEDJAWNDMENTS <br /> The Di Salvo-Lad rop site is 10cWed iffittkediatel southeast of the Sharpe Army Depot. <br /> According to SJCPHS,FAD,the groundwater gradient at the Sharpe Amy Depot is consistently <br /> toward the northwest. Based on the cousistenq of the Sharpe Army Depot groundwater gradient and <br /> the close proximity of the Std Army Depot to the Di vo -Lathrop site, Ccmdor prapnses to <br /> install one(1) two-inch diameter monitor well approxi=ely 10 fte northwest of the east end of <br /> TK4. The monitor well borehole will be drilled nssttg 8-nch D.J., continuous-flight,haIlow- tem <br /> augers. The proposed monitor well location is shown is igme 2, attached. <br /> The proposed monitor well location is at the former location of TK5, which was located <br /> north of, and ad1amnt to, TK4. The bottom of TK5 was approximately 11 feet below the Cmund <br /> surface (bgs). In early 1995, the tank exmadot was ba led with clean soli. Condor proposes to <br /> collect soil samples during the drilling of the 2-inch d' er monitor well beginning at approximately <br /> 11 feet bgs. Soil samples wiD be collected continuously hereafter until the capillary zone is <br /> encountered. Condor expects the capillary zone to be cacount=W at the Di Salvo -Lathrop site at a <br /> depth ranging from 14 to 17 feet bgs. The bottom-most oil sande collected from the capillary zone <br /> will be retained for laboratory analyses. <br /> The soil sample colleced during installation of the monitor well and subsea=groundwater <br /> samples will be analyzed in a000rdmm with the S)CPHSERD approved amendments to the work <br /> plan. Condor proposes the detection limits listed in Table i for laboratory analyses of the respective <br /> samples. The detection limps listed in Table 1 are the detoctOn limits recommended in the Tri- <br /> Regional Board Staff`Reoommenations for Preliminary 19valuation and Investigation of Underground <br /> Tank Sites, August, 1990. <br /> TAX R 1 <br /> ][,aboratery Del eWon Bruits <br /> g T E % <br /> Keroseme Diesel Motor ail <br /> 5.0 5.0 5.0 .5.D 1.0 1.0 10.0 <br /> s s Aft Mft nV ft m9ft m8ft <br /> =WATER 0.5 Q$ a_s 0_05 a.0u 0.5 <br /> > � Pei 001 <br /> �� ccsx€�on <br />