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05/10/95 09 39 FAX 916 387 0802 DAMES & MOORE IIO02 <br /> r <br /> A <br /> P <br /> P <br /> To further characterize the cherflical nature of contaminants present in the 1 E <br /> N <br /> Soil. and evaluate whether the soil proposed far ewcav*tioa and ou-site <br /> treatAciat would be classified as a bazardons waste under Titlo 23 of the I <br /> California Administrative Code, one representative soil samplo from each side � <br /> r <br /> Of the maxatenance shop was obtained for further testing. A sample from k A <br /> beneath the former 10,000-gallon tank (west side) was collected by Dimes & , <br /> Moore personnel on January 17, 1990. This sample was submitted to hCCULAS <br /> Snvi,ro=enLal Services of Petaluma, California for analysis of Total Petroleum <br /> I <br /> Hydrocarbons (TPS) as diesel (EPA Kethod 255918015, modified). 17 CAM metals <br /> (HFA Methods 6010 and 7000 series), and flashpoint (Bea Method 1010). in <br /> addition. a dupliagt.e of this sample ..as also submitted to HNSSUO Cal Labs of <br /> Ventura, Califoxmda for a 96-hour CCR Bioassay test (Title 22 CCH, Section <br /> 66696). A representative sample from the beneath the former waste all/waste <br /> solvent tt=X on the east side of the shop was collected by Dames & Moore <br /> Personnel on March 23, 1990. Because sof the potential for the presenr'e of 4 <br /> waste oil and/or solvents, this sample was analyzed by ACCUL,AB for total � <br /> F <br /> recoverable hydrocarbons (SPA Method 418.1), caamium, chromium. lead, zinc and F <br /> halogenated volatile organics (EPA Nothod 8010), in addition to tPH as die�rel, E <br /> A <br /> E <br /> • The results of the supplemental testing are mu:nmarIzed on Table 1 sad � <br /> complete laboratory reports are included in Appexxdin A. Comparable ? <br /> concentrations ofd' TPH and %= (6,000 ppm vs. 7,200 ppm) measured in a soil. � <br /> 32myla collected on the east side of the shop suggests that the hydrocarbons <br /> present in the soil are indicative of diesel fual and not higher boiling poliat <br /> hydrocarbons typically associated with waste oa,ls. Several metals were <br /> detected above the method detection limit in both samples; however, [ <br /> conCentratioDs of metals detected were all well below the desiSnated Total � <br /> Tbreshold Limit C*Acentratxona (TTLC) and ten times the Soluble Threshold ' <br /> Limit Concentrations (STLC)_ The low cozoentratious of metals present in the <br /> soil samples is likely characteriatic of background conditions, and supports <br /> the conclusion that waste oils are not present in soils underlying the east <br /> end of the shop. No halogenated volatile organic compounds (solvents) -were <br /> detected above the method detection limItf in the sample collected from the <br /> �/G xn .Y �.... �rf 6d•r8 �d,r lG.�;c-,r. <br /> BS/0458d <br />