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y � MOM _ s� f ,. Color Spot, Inc. D February 14, 1990 (88168C) 2 j The soils surrounding the fill port and the southwestern corner of the UST were visibly stained and smelled of diesel fuel. Field monitoring with rw a photoionizat:ion detector (PID) also indicated elevated total volatile petroleum hydrocarbon (TPH) concentrations. Soil samples collected after the UST was removed exhibited ethylbenzene, total xylenes, and TPH concentrations in excess of applicable regulatory action levels. As a result of the soil contamination, SGD was retained by Color Spot, Inc. , to verify the existence of soil contamin- ation, delineate the lateral extent of contamination, and to evaluate adjacent domestic ground water wells for contaminants associated with diesel fuel. SGD conducted a soil vapor survey August 15, 1989, under San Joaquin Local Health District (SJLHD) permit 89.1857 and documented by SGD letter-report entitled Soil Va or Sr_ud Color S of odi I c October 1989. Results of the survey indicated that th.e diesel fuel contamination within the shallow subsurface (depth of 6 feet below ground surface) does not appear to have mi gat x a significant disaterally tance beyond the tank excavation. The contamination ed lap eared! to be limited to the southwest corner of the excavation. The analytical results yj4 #moi of the ground water samples collected by SGD from the domestic water wells at the site, at that time, indicated that ground water did not contain hydrocarbon contamination above regulatory action levels, METHODS OF REMEDIAL ACTIONS/iNvESTIGATION Soil Removal Program. Because the SJLHD has a clean up to nondectac~ion policy, ,�c� l on-site remedial action techniques, could not be , • utilized (nonla can guarantee absolute clean up) and SGD decided that removal and lid off-site disposal was the only practicable remediation available for the site. On January 9, 1990, SGD implemented a soils removal program at the site to remove I the hydrocarbon-contaminated.soils. JTO was contracted by Color Spot to excavate f r ` and remove the remaining contaminated soil from the UST excavation h3 2 - Site Plan Prior to Implementation of Sails Ppmot=al pro (See Figure the use of a John Deere employed 690, track-hoe excavator to remove mthe cow:aminated As the soil was bei � . soils, ng removed, it was visually and alfactorally l as z monitored, as well as monitored with a PIb. '7 previously determined contaminated soil piles (Figure ) wased then loadedas , into transport trucks operated by Dillard TruckingCompany t contaminated soil (by sight, smell or`PID reading)y (DTC)' After all obviously excavation, an additional 5 feet of soil was removehad been removed from true ` ensure complete. reatediatian, from the walls and floor to t t DTC transported approximately 160 cubic yards of contaminated soil _ from the site to an apprved_TSD_facility----The material was disposed of at T yT-------Liquid Waste Management, Inc., located in McKittrick, California, Non-Hazardous Waste Manifest forms can be found in Appendix B. A � i :tTA�