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n <br /> FOOTHILL <br /> ENGINEERING <br /> F'. 12793 PADDY CREEK LANE L:DI, CA 96240 <br /> PH. (209?368-9391 FAX(209) 367-7163 <br /> Ms. Margaret Lagorio February 18, 1998 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 388 <br /> Stockton, CA 95201 <br /> Subject: Payless Building Supplies - Gasoline Tank Removed Site code. 500140 <br /> Dear Ms. Lagorio: <br /> The following is a report of the analysis of water samples taken on 01/27/98 by Del-Tech under <br /> the supervision of the author and analyzed by Sherwood Labs and West Laboratory. <br /> SITE HISTORY <br /> The subject gasoline tank was discovered by the owner and removed in July of 1993 by Thorpe <br /> Oil of Lodi, California. A soil sample taken from the area under the center of the tank at a depth <br /> of 8.5 feet below the surface was analyzed and found to contain elements of BTEX and gasoline. <br /> A soil boring was made and a monitoring well installed at the tank site on 08/22/97 by Foothill <br /> Engineering. Analysis of the soil and water from the monitoring well found various levels of <br /> gasoline contamination (see attached test summary). Foothill Engineering recommended and <br /> PHS/EHD concurred that the monitoring well be re-sampled to verify the original analysis. <br /> FINDINGS OF THE SECOND MONITORING WELL SAMPLING <br /> A dramatic reduction in contaminate levels for both BTEX and TPHg were found in the analysis <br /> of the set of water samples dated 01127198. TPHg was reduced from 191 ug/L in the sample of <br /> 08/26/97 to ND for the last sample(see attached analysis reports). <br /> RECOMMENDATION <br /> It is the recommendation of the author that this UST site be considered for closure. The levels of <br /> contamination in the monitoring well do not present a danger to the underground water supply. <br /> Most likely contamination levels will continue to decline with the passage of time. <br /> Please contact this office if any questions arise concerning this report. <br /> Respectfully submitted, <br /> .S <br /> Foot ' gi eerie Q ()FES <br /> �Q N <br /> RIFE Fr <br /> No. 2 <br /> O <br /> Ervin Rifenbur PE Exp.W �-r <br /> 1 <br />