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Grndwater 9169333197 P.04 <br />MONITORING WELL (MW-6) DECOMMISSIONING WORK PLAN <br />2115 WEST WASHINGTON STREET <br />Stockton, CALIFORNIA <br />1-9 INTRODUCTION <br />PM Ag Products, Incorporated (PM Ag) owns and operates an animal feed product facility at 2115 <br />West Washington Street, Stockton, California (Figures 1 and 2). In 1991, several hundred tons of <br />feed-product-stained soil was sampled, tested, excavated, and removed from the West Washington <br />Street site. A 28-foot, 2-inch-diameter, monitoring well was installed to monitor possible ground <br />water contamination. The well was sampled periodically from 1991 through 1994. Water samples <br />showed very low levels of nitrates and other nitrogen-bearing compounds. The well currently serves <br />DO purpose. <br />2.0 PURPOSE <br />The monitoring well (MW-6) at 2.115 West Washington Street will be decommissioned to protect <br />local ground-water quality and preclude possible vandalism. <br />3.0 SCOPE OF WORK <br />Sierra-Pacific will manage the decommissioning of the shallow monitoring well (MW-6). The work <br />will involve removal of the well casing, over-boring to a depth of 29 feet, and tremmie-grouting with <br />bentonite/cement slurry. The work will be done by a licensed drilling contractor experienced in <br />decommissioning wells in accordance with San Joaquin County well decommissioning procedures. <br />3.1 field_lttlons. <br />Field preparations will include a pre-construction meeting, telephone conversations, and <br />correspondence with various parties, including: PM Ag Products, San Joaquin County, and the <br />Central Valley-Regional Water Quality Control 13oard (RWQCB). After receiving written approval <br />1