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L� to constitute a Sampling and Analysis Plan as normally required by U.S. EPA. Guidelines for preparing sampling plans are contained in "Preparation of a PRP Sample Plan for U.S. EPA Region IX" October, 1987, and in "Interim Guidelines and Specifications for Preparing Quality Assurance Project Plans" December 29, 1980. Recommendation #2 Section I I& SHAD proposes to install 21 additional groundwater monitoring wells at 12 locations. The rationales for these wells are listed in Table 11.0-1 (pg. 11-3) of the draft RI/FS report and are summarized below: M The rationale for all three new wells to be located in the South Balloon (PW1B, PW2C, PW3C) is plume definition. ■ The rationale for the two A -zone wells to be located in the central area (MA, PG115A) is the downgradient exploration of high soil gas areas south of, and adjacent to the IWTP, on the eastern edge of the depot. ■ Three AB well clusters are to be installed downgradient of soil gas peak locations on the west edge of the base near the runway ponds. PW-6AB would be located upgradient and south of existing A -zone well 423 and two well clusters (437 ABC and 407 ABC) that have shown high TCE levels in the B- and C -zones. PW-7AB would be located at the northwest corner of the runway, upgradient of existing well cluster 507. PW-8AB is to be located upgradient of wells 411 A and 444 ABC. Well 444 B has shown high TCE levels in the past. ■ Two clusters of A-, B- and C -zone wells and one C -zone well are to be installed in the North Balloon area. PW-llABC is to be located downgradient of well 439 and a nearby soil gas peak area. This cluster is intended to provide plume definition. It is located upgradient of well cluster '517 ABC, where TCE has been found in the C zone at higher levels than in either the A or B zone. PW-9ABC and PW -10C are located in the south central portion of the North Balloon in the upgradient vicinity of well cluster 421 ABC. The 11