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r 'FARR ASSOCIATES Environmental Engineering and Geohydrology March 13, 2000 rR E C E 1 V BE) MAR 15 2000 Ms. Laurie Duncan ENV1R0t,,4MLNT;N1L_ HEALTH San Joaquin County Public Health Services PERNAIT l SERVICES Environmental Health Division 304 E. Weber Ave., 3`d Flour Stockton, California 95202 Subject: Work Plan for Abandonment of Monitoring Wells at the Former Union Ice Facility, 425 North Union Street, Stockton - Site Code: 241434 Dear Ms. Duncan: On behalf of the Union Ice Limited Partnership, the following work is proposed to abandon the five (5) monitoring wells at the subject site in Stockton. The planned well abandonment is the final step in site closure, following the Central Valley Regional Water Quality Control Board's No-Further Action Letter of November 15, 1999. The field work for well abandonment will be completed by Hal Hansen of Doulos Environmental, Inc. Mr. Hansen is a registered geologist and holds a C-57 contractors license. All five monitoring wells will be abandoned in place by pressure grouting with a neat cement slurry. The cement slurry will be made by thoroughly mixing approximately 11 - 13 pounds of type II Portland cement per gallon of clean water. The grout will be placed in the well with a trimmie hose from the bottom of the well to the surface. The estimated volumes of grout that will be required for each well are presented on Table 1. To calculate the grout volumes presented on Table 1, the porosity of sand in the annular space of each well has been estimated to be 32%. TABLE 1 Well Casing Drilled Sounded Drilled Sand Calculated No. Diameter Depth Depth Diameter Interval Grout Vol. (inches) (ft) (ft) (inches) (ft-bgs) Req'd (gals) MW-1 4 75 73 10 est. 51 - 75 74 MW-2 2 80 71 7.25 55 - 80 28 MW-3 2 80 74 7.25 54 - 80 29 MW-4 2 80 71 7.25 55 - 80 28 MW-5 2 80 76 8.0 57 - 80 30.5 5856 Granite Hills Drive• Granite Bay, California 95746 Tel. (916) 781-9327 • Fax (916) 781-9357