HomeMy WebLinkAbout20042250.tiff FROM : FAX NO. :3034639321 Oct. 14 2003 04:01PM P2
EXHIBIT
CHURCH & Associates, Inc. A
ENGINEERS& GEOLOGISTS [LI"
October 14, 2003
RJRM, LLC
Attn: Mr,Ruben Rodriguez
13015 Weld County-Road 16
Fort Lupton, CO 8062I.
Subject: Onsite Wastewater System Assessment
Existing La Maravilla Restaurant and Dance Hall
13015 Weld County Road 16
Weld County,Colorado
Job No. 15943
Mr. Rodriguez,
As requested, CHURCH & Associates, Inc. (CHURCH) has conducted an assessment of the existing
onsite wastewater system (OWS) with respect to daily sewage flows produced at the subject site. This
assessment is based on the water use data provided by you and a previous evaluation report of the OWS
by others. The physical condition of the existing OWS or characteristics of wastewater at the subject site
were not evaluated by CHURCH.
Site Conditions: The site is an approximate 3.4-acre parcel of land located at the northeast corner of
Colorado State Highway 85 and Weld County Road 16. A site visit was conducted on October 13, 2003.
At the time of the site visit, it was observed that the existing leach field area was paved with asphalt
pavement.Drain field observation pipes were not observed. Therefore, the condition of the existing drain
field was not determined. It i.s understood that municipal sewer maybe near the subject site in the next
few years pending on future development in the area. Water is provided by an onsite well.
Current Operations: it is understood that the restaurant has a temporary certificate of occupancy that will
expire in October 2003, which allows for a maximum of 60 scats in the restaurant serving 158 meals per
day and 350 people per night in the dance hall. The restaurant currently operates with paper service from
11:00 am to 7:00 pm, seven days a week. The dance hall operates from 8:00 pm to 1:30 am on Thursday
to Sunday every week.
It is understood that you wish to increase the capacity of the Dance Hall from 350 people per night to
600 people per night, if possible. It is understood that the current maximum capacity of the dance ball
per local building and/or fire department regulations is 752 people. The dance ball capacity is currently
limited by OWS capacity.
Existing OWS: The existing OWS consists of septic tanks and a 3740 square-foot drain field. The
existing OWS was permitted under Weld County permit No. SP-9700328 and is at least 10 years old.
High Plains Engineering performed an evaluation of the existing OWS in April 2003 to determining the
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FROM : FAX NO. :3034639321 Oct. 14 2003 04:02PM P3
OWS Assessment
Job No. 15943,October 14,2003
Page 2
average daily sewage loading capacity for the existing drain field. A copy of this evaluation is presented
in Appendix A. The results of this evaluation were used in establishing the limits of temporary certificate
of occupancy. A sewage flow of 1727 gallons per day (GPO) was determine by High Plains to the
average daily sewage loading for the drain field. This was in part based on a 15 minutes per inch
percolation rate. High Plains Engineering proposed addition septic tank capacity be installed, which has
been completed.
You informed us the existing OWS has functioned adequately, and no surfacing of effluent or backups
of the sewer line have occurred.
Water Usage: Water usage has been monitored by you from May 2003 until present The water use data
is presented in Appendix B. Based on the data provided, peak usage is during the periods when both the
restaurant and dance hall arc in operation, particularly during the weekends. The average water usage for
both the restaurant and dance hall ranged from about 1000 to 1200 gallons per day, or 58% to 70%,
respectively, of the average daily sewage load capacity mentioned above. The number of meals sold
during the month of July was also provided for the peak periods of the month which ranged from 63 to
94 meals per day with an average of about 80 meals per day. This is approximately 50% of the permitted
meals allowed per day.
Conclusions: Based on this information it appears that the existing OWS drain field is being utilized at
60% to 70% of its average daily loading capacity. It also appears that if the dance hall capacity were
increased and if the restaurant were to serve the maximum meals currently permitted, the average daily
sewage flow of 1727 GPD may be exceeded. Therefore, it may he possible to increase the capacity of
the dance hall provided the meals permitted were reduced.
Considering that approximately 500 gallons of additional sewage could be produced to achieve the
average daily flow of 1727 GPD and based on 2 gallons/person/day for the dance hall, the capacity of
the dance hall could be increased to by 250 people to 600 people/day. The number of meals permitted
per day should be reduced to 80.
Wastewater strength testing should be performed to assess the wastewater characteristics. High-strength
wastewater being discharged to the drainficld will reduce its performance and service life. Drain fields
placed under pavement may also be subject to a shortened performance life due to reduced oxygen
transfer. Pre-treatment or secondary treatment may be required, if the long-term performance of the
drain field is desired.
Limitations: The conclusions developed for this assessment were based on the water use data provided
by you and the information presented in the High Plains Engineering evaluation. This assessment should
not be considered as a performance evaluation of the existing OWS or as an estimate on the performance
life of the existing drain field. Excavations into the drain field would be required to assess its current
condition and for the presence of biomat material. Water usage,the number of meals served and number
of people using the restaurant and dance hall on a daily basis should be recorded. If water usage exceeds
the average daily loading capacity of the drain field, water use reduction measures should he
implemented or the number of people allowed in the dance hail reduced.
JUN-16-2002 SUN 12:29PM ID: PAGE:3
FROM : FAX N0. :3034639321
Oct. 14 2003 04:02PM P4
OWS Assessment
Job No. 15943,October 14,2003
Page 3
If you have questions please contact us.
Sincerely,
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CHURCH.&Associates, inc. ,1415 0 C;S� ,
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Reviewed by: 0 13172 sit
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Kenneth Hamilton •
Project Manager Edward O. Church,P.E.
E0C/kch
Attachments
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