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FOOTHILL J ENGINEERING 12793 PADDY CREEK LANE LODE, CA 96240 PH C2M) 368-9381 FAX (209) 367-1163 Ms Lin tte December 16, 1996 San Joaquin County Public Health Services Environmental Health Division P O Box 388 Stockton, CA 95201. REPORT OF PHASE 1 SITE INVESTIGATION Subject Norman Higgins AKA Vogue Cleaners 2315 N California Street Stockton, CA Site code 231032 Dear Ms Turkatte, In answer to the PHS/EHD letter of June 21, 1996, Mr Higgins has appointed Foothill Engineering to conduct a site investigation of the above stated property to determine the extent of the contamination plume The following is a report of the results of actions to determine the vertical limits of the contamination under both Tank #I and Tank #2 SITE HISTORY The site has a long history of use as a cleaning establishment and presently continues to have the same use On June 6, 1996 Thorpe Oil removed two empty underground storage tanks from the property under a permit from the PHS/EHD Soil samples from the tank excavation were obtained using standard methods and locations The sample from under Tank #1 was taken at a depth of+/- eight feet The sample from Tank 42 was taken at a depth of+/-nine feet Both these samples and samples from the excavation spoil showed evidence of hydrocarbon contamination (See map enclosed) All of the above samples were analyzed by GeoAnalytical Laboratories, Inc The location of Tank #1 is between two structures and is 25'from the closest access point by drilling equipment Tank #2 can be accessed by vertical drilling equipment SCOPE OF INVESTIGATION The site presented an extemely difficult drilling condition at Tank#1 The soil under the tank could only be sampled by slant drill under the tank from the north side of the property Spectrum Drilling Co had only one drill ng that could slant drill and that ng is in great demand The Work Plan called for two slant bore hole to be drilled at 28 & 42 degrees each The overhead power lines and the north side property line restricted the access by the drill ng As a result, only a slant bore hole of 50 degrees could be drilled To increase accuracy of the soil profile, samples were taken at five foot intervals for the first 55' of slant bore, and 10' intervals for the last 20' of the bore hole The monitoring well installed at the location of Tank 92 (gasoline tank) The bore hole for the monitoring well was sampled at ten foot intervals instead of five foot intervals per the Work Plan The change in sampling interval was made to cut the cost of sample analysis More samples were take 1