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FOOTHILL <br /> • ENGINEERING <br /> t ^1279P�E)DY CREEK LANE LODI, CA 95240 <br /> (209) 368-9381 FAX (209) 367-1163 <br /> Harlin Knoll August 5, 1999 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 388 <br /> Stockton, CA 95201 <br /> Fax: 464-0138 <br /> Subject: Sun West Liquors, 2449 W. Kettleman Lane, Lodi, CA LOP <br /> Dear Sir: <br /> The owner of Sun West Liquors requested that Foothill Engineering conduct additional site investigations <br /> to determine the horizontal and vertical extent of the contamination found in earlier investigations.Please <br /> find below the report covering this phase of work completed under the work plan dated May 24, 1999. <br /> REPORT ON THE EXTENT OF UNDERGROUND HYDROCARBON PLUME <br /> AT SUN WEST LIQUORS <br /> History <br /> On 7/10/1998 Thorpe Oil of Lodi, California removed the three gasoline USTs from the Sun West <br /> Property. Soil samples from underneath the UST's and the dispenser piping indicated that some leaks had <br /> occurred during the life of the gasoline sales operation. Foothill Engineering did a site investigation to <br /> determine the vertical and horizontal extent of the gasoline contamination on 8/13/1998 and 812111998. <br /> A listing of the results of analysis of the soil samples is attached. <br /> Geomatrix installed the monitoring well GMXI at a location+1-25 feet south of the UST excavation and <br /> sampled first groundwater. That analysis is attached. Geomatrix also made three scsil borings (GB#1, <br /> GB42, and GB#3) with both soil samples and groundwater samples extracted (see attached map for <br /> location). All samples on GB#1, GB#2, and GB#3 were non-detect for all compounds analyzed (see <br /> attached recaps of data). <br /> The work plan of 5124199 called for the installation of three soil borings to be located on the Sun West <br /> Liquor property and the possible installation of a fourth soil boring on the south side of Kettleman Lane. <br /> Soil samples were to be extracted at predetermined depths for laboratory analysis. A monitoring well to <br /> sample ground water was to be constructed in each of the soil borings. <br /> Procedure <br /> The soil bores for the monitoring wells were drilled with a hollow stem auger. Samples were extracted <br /> at five foot intervals by a standard BX split spoon sampler. Pre-determined samples and samples that <br /> indicated signs of contamination were sealed and placed on ice for transport. Soil borings terminated at <br /> a depth of fifty feet or to the vertical extent of the contamination. The monitoring wells were installed <br /> 1 <br />