SITE INFORMATION AND CORRESPONDENCE

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%"e N0001 Roberts Petroleum Services Facility July 11, 1990 Project No. 1628G Page 4 Discussion Monitoring well MW-8 was installed to determine if free-phase petroleum hydrocarbons persisted in the area adjacent to well MW-1 and the transfer block: none were detected. In May, an additional set of groundwater samples was collected from the on-site wells as part of the continuing investigation to determine the extent of groundwater contamination. Dissolved hydrocarbons were detected only in well MW-8 and not in the remaining wells. This was the fourth sampling during the past year in which the perimeter wells remained nondetectable for petroleum hydrocarbons. From the data, it appears that hydrocarbon contamination of the groundwater is limited to the area of the transfer block. Petroleum hydrocarbons were detected in seven of the soil samples submitted for analysis. Contaminants were detected throughout the entire profile, except at the 6- and 21-foot depths. At the 16-foot depth, concentrations were minor. Reporting Requirements A copy of this report should be forwarded by Woolsey Oil Company to the following agencies in a timely manner: San Joaquin Local Health District California Regional Water Quality Control Board Environmental Health Department Central Valley Region 1601 East Hazelton Avenue 3443 Routier Road Stockton, California 95201 Sacramento, California 95827-3098 Attention: Mr. Harlen Knoll Attention: Mr. Tom Peltier Limitations The discussion and recommendations presented in this report are based on the following. 1. The exploratory test borings drilled at the site. 2. The observations by field personnel. 3. The results of laboratory analyses performed by a state-certified laboratory. 4. Our understanding of the regulations of the State of California. and San Joaquin County. Exceltech has performed this service in a manner consistent with the level of care and skill ordinarily exercised by members of our profession currently practicing under similar conditions in the Lodi area. Please note that contamination of soil and groundwater must be reported to the appropriate agencies in a timely manner. No other warranty, expressed or implied,is made.