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Ms.Devra Lewis June 7,2001 Page 4 3.0 PROPOSED SCOPE OF WORK The proposed Groundwater Investigation activities to address the RWQCB's May 11,2001 request for installation of monitoring wells consists of six primary tasks including: Task 1—Access Negotiation; Task 2—Preliminary Field Activities; Task 3—Monitoring Well Installation; Task 4—Groundwater Sampling; Task 5—Investigation Derived Waste Disposal; and, Task 6—Summary Report. Each task is further described below. 3.1 TASK 1—ACCESS NEGOTIATION The Groundwater Investigation will consist of advancing soil borings for the purpose of installing monitoring wells downgradient of the site. The proposed locations are located on land currently owned by Pombo Properties and Mr. Jack Alvarez. Prior to performing any intrusive activities, SECOR must first obtain access agreements from the Pombo Properties and Mr. Alvarez. The offsite land owners will be provided with a standard access agreement for their consideration. Upon obtaining the required access agreements,Task 2 will be initiated. In the event of significant difficulties in obtaining an agreement, SECOR will inform the RWQCB. Based on our previous experience with access negations in the area, negotiations could require over two months. In an effort to make the negotiations go as smoothly as possible, SECOR is proposing the wells be located along unimproved roads or right-of-ways to minimize interference with farm equipment and operations. Siting is further discussed in Section 3.3.1. The schedule for completion of the investigative activities is dependent on obtaining the necessary access agreements. 3.2 TASK 2-PRELIMINARY FIELD ACTIVITIES Prior to conducting the proposed investigation,SECOR will obtain soil boring permits from the San Joaquin Public Works Agency(SJCPWA). The site-specific Health and Safety Plan(HASP)will be updated for use by personnel implementing the Work Plan. The HASP will address the proposed advancement of soil borings and installation of the monitoring wells. A copy of the HASP will be available onsite at all times. The subcontractor(s)performing the field activities will be provided a copy of the HASP prior to initiating field activities. The onsite subcontractors will also be required to maintain their own HASP. SECOR will mark the soil boring locations, contact Underground Service Alert(USA) at least 48 hours prior to the initiation of field work, and contract a private utility locator(California Utility Surveys)to clear the proposed boring locations of subsurface obstructions. SECOR will also inform the land owners of the proposed wells locations well in advance of the proposed field work to allow for removal of potential obstructions. 3.3 TASK 3—MONITORING WELL INSTALLATION The proposed Groundwater Investigation will consist of installing seven groundwater monitoring wells using hollow-stem auger drill techniques. The proposed well locations are presented on Figure 3 and H:\Pioneer-Tracy\WorkPlan200l\workplan.doc SECOR International Inc.