Hi Jason,
FYI – We will need to sample for prior to removing Biosolids. I would like to have samples submitted by the end of May.
Here is what we sent them last year.
Jennifer Cline, P.E.
City of Molalla
Public Works Director
O: 503.759.0218
F: 503.829.3676
From: HEINS Pat [mailto:Heins.Pat@deq.state.or.us]
Sent: Tuesday, February 17, 2015 9:44 AM
To: 'Jennifer Cline'
Cc: 'Fasth, Bill'; jpatrick@cityofmolalla.com
Subject: RE: Molalla - Biosolids Analysis
Cline,
Sorry for the long delay in getting back to you. I was out of the office on a number of public meetings.
In response to your question concerning the sampling of biosolids. The minimum frequency for sampling biosolids is dependent on the amount of biosolids generated as indicated in the table below.
Dry Weigh Metric tons/year
| Tons/year
| Monitoring Frequency
|
0 - 290
| 0 - 319
| Annually
|
290 - 1,500
| 319 - 1,650
| Quarterly
|
1,500 - 15,000
| 1,650 - 16,500
| Bimonthly
|
15,000 and up
| 16,500 and up
| Monthly |
If any biosolids are generated, a facility needs to collect a sample annually which is identified as being a calendar year. Thus, if your last sample was collected in July 2014, you will need a sample for 2015.
If you have any other question, please let me know.
Pat
From: Jennifer Cline [mailto:jcline@cityofmolalla.com]
Sent: Thursday, February 12, 2015 3:16 PM
To: HEINS Pat
Cc: 'Fasth, Bill'; jpatrick@cityofmolalla.com
Subject: Molalla - Biosolids Analysis
Hi Pat,
I have a quick question for you regarding the sampling of Biosolids for the Molalla Lagoons. The City sampled the Biosolids last year in July of 2014. Is this data sufficient to continue using for this year’s removal? I’ve attached the four page Biosolids Analysis Report for your review.
Sincerely,
Jennifer Cline, P.E.
City of Molalla
Public Works Director
O: 503.759.0218
F: 503.829.3676
