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c. <br /> ARCADIS Mr.Walter Hanley <br /> December 23, 2005 <br /> the boreholes,rinse waters and detergent were contained in 55-gallon drums along <br /> with all residual soil cuttings and sample liners.The drums were left on site-pending <br /> analytical results. Upon completion of the field activities, the boreholes were <br /> properly abandoned by backfilling with a cement/grout/bentonite.mixture under the <br /> observation of Mr. Harlin Knoll from the SJCEH.D. <br /> Results <br /> Analytical results of the soil and grab groundwater samples from the three temporary <br /> borings(SB-.I, SB-2,and SB-3)were compared to the following regulatory <br /> standards: <br /> • 2004 USEPA-listed Primary Remediation Goals(PRGs)for Industrial Soil and <br /> • 2005 California-listed Maximum Contaminant Levels(MCLS)for <br /> groundwater. <br /> TPH-d,TPH-g, isopropyl ether(DIPE), cadmium,chromium,lead,nickel, and zinc <br /> were detected in the soil and/or groundwater samples. The analytical results and <br /> regulatory standards aresummarized on Table 1, and TPH-d results for soil are <br /> presented on Figure 2,and TPH-d,TPH-g,BTEX,and oxygenates in groundwater <br /> are presented on 3. The analytic results are summarized as follows: <br /> ■ TPH-d was detected in all soil and groundwater samples,except the soil <br /> sample collected from boring SB-2 at 23 feet bgs.The maximum <br /> concentration detected in soil was 150 milligrams per kilogram(mg/kg) from <br /> boring SB-1 at 19 feet bgs.The maximum concentration detected in <br /> groundwater was 19,000µg/L from boring SB-3. Currently,an industrial PRG <br /> or MCL for TPH-d have not been established. <br /> ■ TPH-g was only detected at 64µg/L in the groundwater sample collected from <br /> boring SB-1.Currently,a MCL for TPH-g has not been established. <br /> ■ DIPE was detected at 54,ug/L in the groundwater samples collected from <br /> borings SB-2 and SB-I Currently,a MCL for DIPE has not been established. <br /> ■ Chromium was detected in all,soil and groundwater samples.The maximum <br /> concentration detected in soil was from boring SB-3 at 19 feet bgs at a <br /> concentration of 41 mg/kg,.below the industrial PRG(450 mg/kg).The <br /> g1projects-active\lkq stockton\phase ii12059 navy drive site inv.doc 5/8 <br />