All Weather Dump Site for Clean Fill, Inert Waste and Special Materials (Non-Inert Waste)

Clean Fill Materials Dumped Must Be Free Of Petroleum And/or Heavy Metal Contaminants.

The Normal Operating Hours Are: Monday – Friday 7:30am To 3:30pm

The Pit Is Permitted To Operate Monday – Friday 7am To 7pm And Saturday 9:00am To 7:00pm. For off hours dumping, there is a $750.00 opening fee subject to project specifications.  Please inquire about expanded hours for approved public works projects. The Projects must be approved in advance by the King County DPER.  

The dump site is located near the “four corners” HWY 169 (Maple Valley Hwy) and HWY 516 (Kent Kangley Road) in Maple Valley – see directions on our Location Page or give us a call.

The dump site is an all weather site with below grade dump sites. The site can accept the following materials and charges are set by the truck and trailer (either 7 or 8 axle) –  Charges are for normal hours and subject to change.  Please contact us for pricing on approved public works projects.

**Please contact us for special pricing on large projects. Please inquire about other materials not listed for
availability and pricing. Reserve Silica reserves the right to refuse any materials and check loads for material composition and acceptability. 

*Prior to using this site, a customer is required to sign the Company’s Standard Operating Agreement and Clean Soils Affidavit. Click Here to Open. Arrangements for time of delivery, type of material, and quantity must be made in advance. Please contact the office at 425-432-1241 to make these arrangements.  We will also bid large projects for special pricing.  Please inquire about other materials not listed for availability and pricing. Good communication with us saves lots of confusion and misunderstandings. Reserve Silica reserves the right to refuse any materials and check loads for material composition and acceptability.

*This does not include waste oil contaminated soils which should be disposed of in a lined landfill.

Any inert materials not in compliance with County, State and Federal inert fill regulations will be removed at the expense of the delivery party and the owner of the source of the materials.  Any materials dumped at the site without the approval of Reserve Silica will be subject to additional fees.