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• GRANITE CONSTRUCTION—FRENCH CAMP Page 2 <br /> WKA No 2088.09 <br /> March 12, 2003 <br /> analytical laboratory The samples were immediately placed in an ice-chest containing ice and <br /> submitted under Chain-of-Custody documentation to Kiff Analytical, a California Department of <br /> Health Services certified laboratory, for analysis of Total Petroleum Hydrocarbons (TPH) as <br /> diesel using Modified EPA Method 8015, TPH as gasoline,Benzene, Toluene, Ethylbenzene, and <br /> Total Xylenes (BTEX), the five fuel oxygenates, and lead scavengers using EPA Method 8260B <br /> All water removed during purging operations was sealed in a labeled 55-gallon drum and stored <br /> on-site <br /> Findings <br /> Depth-to-groundwater measurements beneath the site ranged from 22 21 feet to 24 06 feet below <br /> top of casing Groundwater flow direction is toward the northwest with a hydraulic gradient of <br /> approximately 0 002 feet/foot(Plate 2) Free product, sheen or petroleum hydrocarbon odor was <br /> not observed in the wells Groundwater elevation data is summarized in Table 1 <br /> Analytical results for water samples obtained from monitoring wells MW 1 through MW4 did not <br /> reveal concentrations of TPH as gasoline, toluene, ethylbenzene,total xylenes, fuel oxygenates <br /> or lead scavengers Benzene(1 4 µg/L)was only revealed in the water sample obtained from <br /> MW2 Minor concentrations of TPH as diesel,ranging from 72 µg/L to 210 µg/L were revealed <br /> in water samples obtained from wells MWl, MW2 and MW3 However, the laboratory(Kiff <br /> Analytical LLC) stated in a supplement to the original analytical report that"Hydrocarbons <br /> reported as "TPH as Diesel"do not exhibit a typical diesel fuel chromatographic pattern It <br /> appears that the boiling point range is slightly higher than diesel fuel " Analytical results for the <br /> water samples are summarized in Tables 2 and 3 Chain-of-Custody documentation and <br /> laboratory analytical reports are appended <br /> Conclusions <br /> Groundwater in the vicinity of wells MWl, MW2 and MW3 appears to be impacted with minor <br /> concentration of an unknown petroleum hydrocarbon that has a boiling point range slightly <br /> higher than diesel fuel Furthermore, a minor concentration of benzene was detected in well <br /> MW2 Gasoline, toluene, ethylybenzene, total xylenes, fuel oxygenates or lead scavengers were <br /> not revealed in the water samples according to our most recent groundwater sampling and <br /> • <br /> `dW <br /> WALLACE KUHL <br /> Rey,t,d parr &ASSOCIATES INC <br />