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I DIETZ ENGINEERING AND CONSTRUCTION, INC. 1 120 HOLLYWOOD AVENUE,SUITE 3,.OAKLAND,CALIFORNIA 94602 WORK PLAN FOR GROUNDWATER-QUALITY MONITORING WELL DESTRUCTION 7500 W. 11th STREET,'-TRACY CA 95304-9305 San Joaquin County Environmental Health Department Site Code: 1392 Closure of the groundwater-quality monitoring wells at the 7500 West Eleventh Street in Tracy will be completed in compliance with the applicable requirements of the San Joaquin County Well Standards (San Joaquin County Ordinance Code Section 9-1115.6 as amended may 8, 1993, R-93-307- The wells to be closed are located as shown on attached Figure 1. The closures will be effected following the sequentially implemented actions described below. • A California licensed professional surveyor will mark the location of Monitoring Well MW-11 the steel cover of which was removed and the site of which was 1_� covered by bituminous macadam during the widening and re-paving of Chrisman Road, • Traffic control plans will be prepared and encroachment permits will b 'rained ,,v from the San Joaquin County Department ofEnvironmental Health'To permit/ drilling at the site of Monitoring Wells MW-5, MW-6, MW-8, MW-9, M@l.40, MW-I I MW-13 and MW-19. • Applications for well closure permits with, where applicable will be accompanied by copies of the public right of way encroachment permit will be a made to the San Joaquin County Department of Environmental Health-, go, j.4 • At well sites ,. re the ground surface is covered in bituminous macadam or concrete, w4i-b;6 diamond drilling will be used to remove the surfacing over a sufficient area and sufficient depth to permit over-drilling of the well casings. . • Prior to contactors mobilizing to the site to close the wells, the San Joaquin County Environmental Health Department will be notified so that staff of that agency can be available to oversee the well closures. • The well covers and surrounding concrete will be removed from each well head and the well covers and debris will be temporarily stockpile on site. TELEPHONE:OAKLAND,CALIFORNIA(`J 10) 336-9118 TRACY, CALIFORNIA(209)832-29 10