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Mr. Harlin Knoll August 13,2001 Page 3 Groundwater Monitoring, Smpling and Analysis After the monitoring well seal has set for at least 72 hours,and then on a quarterly basis thereafter,all four 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 ele(trical-cofiductivity-values have stabilized,? Groundwater will 4besaridpled Tromthe wells using disposable polyethylene bailers and laboratory-supplied containers. A. groundwater sample will also be collected from the on-site domestic 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,RIPE, ETBE, TAME, TBA and 1,2- DCA by EPA Method 8260B. Waste Storap-e and Disposal All waste soil generated during drilling will be stockpiled on plastic sheeting and covered for temporary on-site storage,pending analytical results and proper disposition. Equipment rinsate and purged groundwater will be contained in 55-gallon drums for temporary-on-site storage,pending accumulation and proper disposition. Project Reporting The-results ofthe.well installation and initial groundwater sampling will be documented in an environmenta.I-site investigation repo-rt"ha6h of the sut3se'q'ue'n-t-'q'uar-"t-erly 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 PIiS/EHD and RWQCB. SCEHDULE Given standard tum-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 November 2001. Accounting for contractor scheduling and standard turn-around for laboratory analyses,the final project report could be submitted approximately three months thereafter.