SITE INFORMATION AND CORRESPONDENCE

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Mr. Harlin Knoll July 16, 2001 Page 3 Groundwater Monitoring Sampling and Analysis After the monitoring well seal has set for at least 72 hours, and then on a quarterly basis thereafter, all three monitoring wells will be monitored and sampled. Depth-to- groundwater and free product thickness (if necessary) will be monitored using a water level indicator capable of measurements to within 0.01 foot. Following groundwater level measurements,the wells will be purged and sampled. The wells will be purged with a pump and dedicated disposable tubing until at least three well casing volumes have been removed and/or after groundwater temperature,pH and electrical conductivity values have stabilized. Groundwater will be sampled from the wells using disposable polyethylene bailers and laboratory-supplied containers. A groundwater sample will also be collected from the city of Stockton well. Each sample container will be labeled, packaged in an iced cooler and transported for analysis with chain-of-custody documentation to a state of California certified hazardous waste testing laboratory. The lab will analyze each groundwater sample on a standard turn-around for TPH-as-gasoline, BTEX,MTBE,DIPE, ETBE, TAME, TBA and 1,2- DCA by EPA Method 8260B. Waste Storage and Disposal All waste soil generated during drilling will be contained in 55-gallon drums and temporarily stored at the site,pending analytical results and proper disposition. Equipment rinsate and purged groundwater will be contained in separate 55-gallon drums for temporary on-site storage, pending accumulation and proper disposition. Project Reporting The results of the well installation and groundwater sampling will be documented in an environmental site investigation report. Each of the subsequent quarterly groundwater monitoring and sampling events will be documented in quarterly groundwater monitoring reports. All reports will be prepared and stamped by a state of California Registered Geologist and submitted to PHS/EHD and RWQCB. SCEHDULE Given standard turn-around times for regulatory review and approval of this work plan (30 days), and cost estimate preparation and pre-approval by the UST Cleanup Fund (60 days),the planning and permitting tasks could begin in October 2001. Accounting for contractor scheduling and standard turn-around for laboratory analyses,the final project report could be submitted approximately two months thereafter.