Laserfiche WebLink
2444 Main Street, Suite 215 <br /> Fresno. CA x3721 GEQMATRIX <br /> (5591264-2535 • FAX 15591 264.7431 <br /> February 10, 2003 <br /> Project No. 6437 <br /> VIA FACSIMILE: (209) 468-3433 <br /> Mr. Michael J. Infurna, Jr. <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Project Update Summary <br /> UST Site No. 3 <br /> Port Road 14 and G, Port of Stockton <br /> Dear Mr. Infurna: <br /> Geomatrix Consultants, Inc. (Geomatrix), conducted an additional field assessment on behalf <br /> of the Port of Stockton at UST Site No. 3 on January 28, 2003. This work was conducted <br /> based on the "Work Plan for Additional Assessment and Remediation Evaluation of <br /> Petroleum Hydrocarbons in Groundwater"dated October 2002, and a letter from the San <br /> Joaquin Environmental Health Department dated October 22, 2002. <br /> Soil core samples and a grab groundwater sample were collected at a location near 133-5. <br /> Dual-wall (double core-barrel), dual-hole, direct-push method was used to advance the boring. <br /> The first borehole was used for continuous soil coring to about 49 feet below ground surface <br /> (bgs). The second borehole was used for discrete-depth grab groundwater sampling. For the <br /> second borehole, the outer core-barrel was advanced to about 38 feet bgs, with soil cores <br /> removed; a groundwater sampler was then advanced to about 44 feet bgs with the screen <br /> interval exposed from 40 to 44 feet bgs for collecting a grab groundwater sample. <br /> Soil samples were examined for petroleum hydrocarbon (PHC) odor and field-screened for <br /> total volatile organic compound (VOC) concentrations using a photoionization detector(PID). <br /> Neither PHC odor nor VOCs were detected in the soil core samples collected from 0 to 8 feet <br /> bgs. Slight PHC odor and PID readings up to 18 parts per million by volume (ppmv)were <br /> detected in the soil core samples collected from 8 to 12 feet bgs. Relatively strong PHC odor <br /> and PID readings of 122 to 309 ppmv were detected in the soil core samples collected from 16 <br /> to 24 feet bgs. Slight PHC odor and PID readings up to 8 ppmv were detected in the soil core <br /> samples collected from 26 to 36 feet bgs. No PHC odor or VOCs were detected in the soil <br /> core samples collected from 37 to 49 feet bgs. <br /> The grab groundwater sample collected from 40 to 44 feet bgs was analyzed for <br /> 1,2-dichloroethane (12DCA), BTEX (benzene, toluene, ethylbenzene, and xylenes), and <br /> oxygenates (MTBE, diisopropyl ether [DIPE], ethyl tert butyl ether, and tert amyl methyl <br /> ether) using U.S. Environmental Protection Agency(EPA) Method 8260, TPHg using <br /> G,aamatrix Consultants, Inc. <br /> Engineers, Geologists, and Environmental Scientists <br /> C:1Documents and Settingslminfuma\Local Settings\Temporary Internet Files10LK1371project update 2-10-03.doc <br />