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ILL, ENGINEER ING Z09 367 1163 P. 01 <br /> 1jH-Q2-99!--.WE3D 12 -55 PM FOIDTH <br /> iw <br /> FOOTHIET, <br /> 1;?,793 PADDY C�REEK LANE L<>Dl. CA 95240 <br /> 0 3 (209)368-9381 FAX(209>367-1163 <br /> Harlin Knoll May 24, 1999 Rev.5128/99 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division ENVIRONMENTAL HEALTH DIVISION <br /> P. O. Box 388 304 E. Weber Ave. Third Floor <br /> Stockton, CA 95201 P 0. Box 388, Stockton CA 95201-0388 <br /> Fax:464-0138 Approved 0 <br /> Denied 1-1 <br /> Subject: Sun West Liquors,2449 W.Kettleman Lane, Lodi,CA Conditions gZ(,a <br /> atefo 0 <br /> QD' <br /> A. - QLMA± Q F <br /> Dear Sir: by <br /> Groundwater samples taken from the monitoring well i istalled by Geornatrix on 4/28/1999 have been <br /> analyzed and found to contain both BTEX and MTBE.T1 e owner of Sun West Liquors has requested that <br /> Foothill Engineering conduct additional site investigatioz s to determine the horizontal and vertical extent <br /> of the contamination-Please find below the proposed work plan to determine the extent and the source <br /> of the contamination indicated in monitoring well GW 1. <br /> THE WORK PLAN FOR INSTALLING AND SAMPLING THREE MONITORING WELLS <br /> History <br /> On 7/10/1999 Thorpe Oil of lAxU California removed the three gasoline UST from the Sun West <br /> Property. Soil samples from under the UST's and the c ispenser piping indicated that some leaks toad <br /> occurred during the life of the gasoline sales operation. i-oothill Engineering did a site investigation to <br /> determine the vertical and horizontal extent of the gasoll rie contamination on 8/1311998 and&21/1998. <br /> The a listing of the results of analysis of the soil sample;is attached. <br /> Geomatrix installed a monitoring well GMX I at a location+1-25 feet south of the UST excavation and <br /> sampled first gratindwatcr and that analysis is attached- Geomauix also made three soil boring(BH#I, <br /> BH#2, and BH#3) with both soil samples and groundwater samples extracted (see attached map for <br /> location). All samples an BH#l,BH#2, and BH43 weie non-detect for all compounds analyzed (see <br /> attached data). <br /> Procedure <br /> The soil bores for the monitoring wells will be drilled with a hallow stem auger. Samples will be <br /> extracted at five foot intervals by a standard BX split spc-on sampler. Sampling will continue to a depth <br /> of fitly feet or to the vertical extent ofthe contamination. The monitoring well will be constructed of two <br /> inch PVC,well casing with ten feet of screen between 40 1 o 50 feet bgs-(see monitoring well construction <br /> details attached). <br /> Installation of MW#2(proposed)will requiredthat acorKucterbc installed to drill through the pea gravel <br />