HomeMy WebLinkAboutWastewater Treatment Report.pdfWASTEWATER TREATMENT REPORT FOR BEDROCK RESOURCES, LLC BY Schmueser Gordon Meyer, Inc. 118 W. 6th Street, Suite 200 Glenwood Springs, Colorado 81601
Problem Statement: The following report describes the methods of providing methods of handling wastewater for the Bedrock Resources, LLC property development. Wastewater generated from
the site is anticipated at the following locations: 1. Upper Mesa Facilities (shop and batch plant) 2. Office building Proposed Wastewater System Attached are calculations which summarize
the design of the Wastewater system for the Bedrock Resources, LLC property development. Collection of wastewater will be performed in two locations noted as follows: 1) Office building
2) Shop area The office area is ultimately designed for 10 persons using the restroom facilities at that location. From the CDPHE's Guidelines on Individual Sewage Disposal Systems,
the average daily flow per employee is 15 gpd for office buildings. This results in 150 gpd average daily flow from the office building. For the shop area, there will be two full time
employees using this restroom at the shop. These are the plant operator and the mechanic. At this location, the flow is 30 gpd. Combined, the flow will be 180 gpd on an average day basis.
From a design flow standpoint, the 180 gpd is peaked to 270 gpd. For the combined use of the office and shop, the total septic tank capacity required would be 405 gallons as reflected
in the attached calculations. To accommodate standard available septic tank sizes, a 500 gallon tank is proposed at the office as well as at the shop. The restroom at the shop is intended
to flow to it's own septic tank with the supernatant from the septic tank proposed to gravity flow down to the dosing tank and eventually to the disposal field proposed to be located
south of the office building. Likewise, the office building restroom will flow to it's own septic tank, by gravity, then to the dosing tank and eventually to the disposal field. Between
the disposal field and septic tanks will be a dosing tank where an effluent pump will provide pumped effluent to the disposal field. This dosing tank will be a 250 gallon tank (when
pumping four times per day, the minimum volume required would be 68 gallons). The disposal field proposed for the combined use is to be that of ADS Arc 36 LP chambers configured in a
"trench" configuration. The field has been designed
subsequent to onsite percolation testing and excavation of an eleven foot deep profile hole. No groundwater (or evidence there of) was found within the profile hole and no bedrock was
encountered. The percolation tests were performed at the depth of the proposed infiltrative surface (ie., bottom of chambers) and an average percolation rate of 15 minutes per inch was
measured. Two trenches are proposed using the Arc36 LP chambers with 5 chambers per trench. The trenches have been sized to take advantage of the area reduction of 40%. Note, however,
that no reduction has been given for the "dosed" delivery of the effluent to the trenches. Typically, the peak design flow can be reduced by an additional 25% with the effluent delivery
to the chambers being that of a dose at 4 times per day in lieu of a constant "trickle". Periodically, the septic tanks will be "pumped" out with the sludge being hauled to a local treatment
facility (ie., Silt, CacaLoco Compost, etc .. ). The recommended frequency for pumping is once every two years. However, monitoring the sludge depth will be required on a yearly basis
to establish the appropriate time for pumping.
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