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r @ <br /> Y f <br /> ON, q OF Th"er TV <br /> ■ ■ <br /> OF TRACY <br /> Utilities Division <br /> ,a J 3900 Holly Drive Telephone: (209)836-1650 <br /> 9,~CORPORP��O Tracy, CA 95376 Fax: (209)836-0932 <br /> A composite sample from our sludge drying beds was collected on August 11, 1994 <br /> before the fall application. Each bed was divided into four quadrants and a 250 ml plastic <br /> beaker used to collect samples from the center of each of the quadrants. Aliquots were <br /> combined, well mixed and analyzed for the EPA 503 metals. <br /> Samples of air dried and stockpiled sludge were collected on October 16, 1994,just <br /> before a fall application. The stockpiles present in each of the four beds were divided into <br /> four quadrants and a 500 ml plastic beaker filled from a location near the center of each <br /> quarter. Sample aliquots were combined in a plastic bucket, mixed and sent to an outside <br /> laboratory for EPA 503 metals anaylses. Samples were refrigerated, treated and shipped <br /> in containers specified by the contract laboratory. <br /> Diagrams of sample locations are included. <br /> Samples of digested sludge were collected from either the recirculated, well mixed <br /> digested sludge or composited from the sludge as it was wasted to our drying beds. <br /> Samples were collected from the stockpiles on March 30, 1994, before spring application, <br /> for the pathogens. These were two grab samples collected with sterile equipment and <br /> cooled before and during shipment to an outside laboratory for analyses. <br /> Samples for pathogens were collected from each of our drying beds, prior to cleaning and <br /> fall application, in September, 1994. These were grab samples sampled from near the <br /> center of each of our beds and one stockpile with sterile equipment. They were cooled <br /> befoe and during shipment and analyzed by an outside laboratory. <br /> Analytical Results <br /> The attached tables shows analytical results obtained on samples collected in 1994. <br /> Results met or exceeded the compliance limits for sludge applied as Class B. <br /> Vector Attraction Reduction <br /> Digested sludge is allowed to dry in our air drying beds for at least three months at <br /> temperatures over 0 degrees centigrade on a daily basis. Sludge applied in the spring and <br /> fall of 1994 was over 75 percent solids. <br /> Our land applied sludge meets vector attraction reduction requirements because it is air <br /> dried, digested sludge that is applied at over 75 % solids. <br /> 2 <br />