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1 <br /> c7cok ical Technw'o s /a. <br /> ' 1101 Th Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)5224227 <br /> 1 � <br /> ' SITE CHARACTERIZATION <br /> REPORT <br /> ' Monitoring Well Installation <br /> 3rd Quarter Groundwater Monitoring <br /> Valley Wholesale Drug Co., Inc. <br /> 1401 W. Fremont Street <br /> Stockton, California <br /> Project No. 989.2 <br /> ' October 31, 2002 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the monitoring well installation, 3" Quarter 2002 groundwater <br /> ' monitoring and GPS surveyor work that took place at 1401 West Freemont Street, Stockton, <br /> California, between July and October of 2002. <br /> ' One new deep monitoring well (MW-101; TD of 42 feet) and three new shallow monitoring <br /> wells (MW-7, MW-8 and MW-9; TD of 22 feet) were installed during July and August of <br /> 2002. Drill core samples were collected during drilling and subsurface geology was logged <br /> on site. Selected core samples were submitted to Sherwood Labs Corporation for analysis. <br /> ' Groundwater level was found to be less the 10 feet logged bgs. Core samples to ed on site reveal <br /> p <br /> the upper 22 feet of the subsurface is comprised of alternating layers of sand and clay. Core <br /> ' samples from the deep well shows similaralternating sand and clay layers to 31 feet bgs; a <br /> blue clay layer continues from 31 to 42 feet bgs. The lateral extent of the blue clay layer is <br /> not known, but its thickness suggests that it probably covers the site. <br /> rLaboratory analysis of the groundwater samples collected during the Yd quarter monitoring <br /> event show that trace amounts of BTEX constituents are present in four of the ten <br /> monitoring wells. Two of the ten wells contained low concentrations of TPH-gas. Five of <br /> the ten wells show the presence of MTBE in low concentrations with MW-6 containing the <br /> highest concentration. ETBE, TAME, DIPE, TBA, 1,2-DCA, and EDB were non-detect in <br /> all monitoring wells. <br /> ' On October 2, 2002, GTI and Thompson-Hysell Engineers personnel mobilized to the site to <br /> survey the tops of the monitoring wells in accordance to AB2886. The measurements were <br /> used to calculate groundwater elevation,bearing and slope(Table 1). <br />