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Ppl O" <br /> r x�j <br /> THOMAS R. FLINN P.O.BOX 1810-1810 E. HAZELTON AVENUE <br /> STOCKTON, CALIFORNIA 95201-3018 <br /> DIRECTOR c �", � (> (209)468-3000 FAX(209)468-2999 <br /> www.ro.san-loaquin,ca.us <br /> THOMAS M.GAU <br /> DEPUTY DIRECTOR <br /> MANUEL SOLORIO l" <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> CERTIFIED#7099 3220 0001 3721 0088 <br /> SENTON ANGOVE <br /> BUSINESS ADMINISTRATOR <br /> June 24, 2004 <br /> Ms. Kim Schwab <br /> California Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95820-6114 <br /> SUBJECT: REPAIR OF CLOSURE CAP AND OTHER DRAINAGE FEATURES <br /> HARNEY LANE SANITARY LANDFILL <br /> Dear Ms. Schwab: <br /> This letter is to document the successful repair of the landfill closure cap at the northwest corner <br /> of the Harney Lane Landfill (Figure 1 and 2). <br /> The cap was damaged due to erosion by water leaking through a coupling on a surface drainage <br /> pipe (Photo 1). Investigation of the damage indicated that an area of the clay barrier layer <br /> approximately six feet long and three feet wide (Photo 2, 3, and 4). The erosion into the clay <br /> barrier was apparently only a few inches deep; no refuse was exposed. <br /> Repair consisted of placing a geocomposite clay liner(GCL)over and beyond the affected area <br /> (Photo 5 and 6)as approved by e-mail. The GCL placed was that approved for the base liner at <br /> North County Landfill Module 1. Specifications of this material include: <br /> GCL Model: Bentofix Thermal Lock NWL <br /> Bentonite content: 0.84 lb/ft2 at 12%moisture <br /> Grab Strength: 150 lb minimum average roll value <br /> Permeability: 5x10-9 cm/sec maximum <br /> Peel strength: 45 lb minimum <br /> Placement of the GCL was witnessed by Ted Tasiopoulos of San Joaquin County Environmental <br /> Health Department(the Local Enforcement Agency for our landfills). <br /> The area was then backfilled with compacted soil (Photo 7 and 8). The drainage pipe will be <br /> replaced and this surface reseeded in the next month. <br /> Also, we have repaired the erosion on the western side of the"Secondary Site" (Figure 1). Close <br /> inspection of the slopes indicated that the intermediate cover soil on the slopes had received little <br /> damage. The large area of disturbed soil observed on the side slopes was due to the"calving"of <br /> the residual of the ridge berm which remained at the shoulder of the landfill. Prior to the Surface <br /> Reconditioning Project of 2003,the landfill had been provided with a berm along the outer <br /> shoulder, at the top of the slopes. The purpose of this berm was to direct the water to <br />