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_-ITS FOOTHILL ENGINEERING 12793 PADDY CREEK LANE LODI, CA 95240 97 AF? 10 PM 3: 01 PH. C2o4) 368-9381 FAX OWN) 367-1163 Ms. Linda Turkatte March 19, 1997 San Joaquin County Public Health Services Environmental Health Division P. O. Box 388 Stockton, CA 95201 Fax: 464-0138 Subject: Morada Veterinary Clinic, 9629 N. Highway 99, Morada, CA. Dear Ms. Turkatte, SITE INVESTIGATION REPORT FOR MORADA VETERINARY CLINIC HISTORY OF THE UNDERGROUND STORAGE TANK SITE Dr. Delph, owner of the Morada Veterinary Clinic, requested that Foothill Engineering investigate the site of a removed underground gasoline storage tank for possible soil contamination. The underground storage tank was located in a small area near the northeast corner of the garage. The tank had previously been removed and the excavation backfilled with topsoil from the stated property The soil removed from the tank excavation was stockpiled approximately 200' to the northwest of the excavation. The stockpile was approximately three feet high and covered 500 square feet. METHODS OF INVESTIGATION Spectrum Exploration, Inc. was contracted to drill a soil boring at the location of the removed underground gasoline tank. The drill was equipped with an 8" hollow stem auger and split spoon sampling system common to the industry. All items used in the soil boring were delivered to the site in a decontaminated state, ready for use. The boring was started near center of the tank area. Split spoon samples in brass finers were taken at five foot intervals. The first two samples (BH1 @ 5' and BHI @ 10')were typical of the topsoil in the area that was used for backfilling the original excavation. The eight remaining soil samples from the boring showed evidence of being undisturbed original ground. Samples BHI @ 15', BHI @ 20', and BH1 @ 25'produced a gasoline odor. The soil boring was stopped at a depth of 50' and the last sample was extracted. The water table was not reached with this soil boring. Three samples from the stockpile were extracted from the area of the stockpile with a hand-driven sampler. All stockpile samples were taken at a depth of 1.5 feet below the surface. One sample was taken from each end and from the center of the stockpile. ANALYSIS OF SOIL SAMPLES All samples were transported under chain of custody to Sherwood Labs (DHS Certification# 1400). Samples were tested by EPA Method 8020 and EPA Method 5030/8015(M) and reported on a standard format ( See attached Summary of Soil Samples Analysis). The stockpile sample were combined by Sherwood Labs to make one composite sample.