[Amended 1-26-2012 by Res. No. 12-01-003]
Discharges containing concentrations of biochemical oxygen demand and/or total suspended solids in excess of 250 mg/l, or total phosphorous in excess of 12 mg/l, or total nitrogen in excess of 40 mg/l shall be subject to a surcharge in accordance with the Lancaster Area Sewer Authority Schedule of Rates, Charges, and Fees.
Discharges containing concentrations of biochemical oxygen demand and/or total suspended solids in excess of 2,000 mg/l shall be subject to an additional surcharge of three times the standard surcharge rate for that portion of the concentration in excess of 2,000 mg/l, and the standard surcharge rate for the portion of the concentration in excess of 250 mg/l but less than 2,000 mg/l. Any surcharge levied under this section is in addition to the enforcement remedies if a discharge constitutes a violation.
Purpose. The purpose of this policy is to create a fair and consistent method of selecting, testing and applying a strength of waste surcharge to industrial/commercial accounts in the LASA sewer system. This policy is designed to maximize efforts in managing the strength of wastes that are discharged to the LASA treatment facility.
The Authority routinely samples commercial and industrial customers to determine their strength of waste. Typical wastewater contains 250 mg/l of biochemical oxygen demand (BOD), 250 mg/l of total suspended solids (TSS), 12 mg/l of total phosphorous (TP), and 40 mg/l of total nitrogen (TN). Samples are collected and tested for BOD, TSS, TP, and TN. When BOD, TSS, TP, or TN exceeds the typical levels in typical wastewater identified above, the customer will be billed for the additional treatment costs incurred for its high-strength waste. The surcharge program is designed to recover the cost of sampling, testing, and treating these high-strength wastes.
Prior to this policy there was no specific criteria used by the Authority to determine which customers to sample and test. This policy establishes criteria for selecting customers for sampling, testing those customers, and applying the strength of waste surcharge. Implementing this policy will optimize the Authority's efforts by focusing limited resources on those customers with the greatest potential for discharging high-strength wastes.
Step 1: Create a list of all metered customers.
Step 2: Determine the category that applies to each metered customer. Categories are defined in Note 1.
Step 3: Send letters to all Category 1metered customers notifying them of LASA's surcharge policy.
Step 4: Rank all customers in Category 1 based on flow.
Step 5: Sample an initial group of the customers in Category 1 which have the highest volume of flow ranking.
Step 6: After sample results are received from the initial sample group, calculate the mass loadings for those customers that have BOD or TSS exceeding 250 mg/l, or TP exceeding 12 mg/l, or TN exceeding 40 mg/l. See Note 2.
Step 7: Rank the customers from the initial sample group based on total BOD, TSS, TP, and TN load (mass load).
Step 8: Determine the surcharge customers based on the highest mass loads. See Note 3 for definition of surcharge customer.
Step 9: Resample the surcharge customers and re-rank them based on mass load on a quarterly basis.
Step 10: Revise surcharge customer list based on re-ranking. Surcharge customers with lower mass loads may fall off the list, or surcharge customers with higher mass loads may be added to the list based on the re-ranking.
Metered customers will be defined by the following categories:
Food processing or preparation facilities.
Shopping centers with restaurants.
Institutions such as schools and retirement facilities that have kitchen facilities.
Customers in Manheim Township who were being surcharged prior to November 2003. (See Note 4.)
Any other facility with high-strength discharges. (See Note 5.)
Category 2: All metered customers that are not in Category 1.
Surcharge customers will be prioritized based on mass loads. The mass load will be the sum of the mass of TSS, BOD, TP, and TN. Mass load is calculated by the following formula:
[TSS (mg/l) x flow (MGD) x 8.34] + [BOD (mg/l) x flow (MGD) x 8.34]
+ [TP (mg/l) x flow (MGD) x 8.34] + [TN (mg/l) x flow (MGD) x 8.34]
Surcharge customers are the highest priority customers for which LASA has the resources to test each quarter. For example, if the Authority has the resources to sample and test 60 customers per quarter, the surcharge customers will be the 60 surcharge customers with the highest mass loads. Some sampling resources will be reserved to sample and test Category 1 customers who are not surcharge customers and who have not been recently tested.
If LASA surcharged a metered customer in Manheim Township prior to November 2003, then LASA may continue to surcharge that customer, provided the customer meets the necessary criteria. If LASA did not surcharge the metered customer in Manheim Township prior to November 2003, then the customer is exempt from surcharging, provided the customer has not changed its use since November 2003. If the customer changed its use, then LASA may consider placing the metered Manheim Township customer into the surcharge program that is described by this policy.
There are certain commercial or industrial processes that do not specifically fall into Category 1 but still have the potential to generate wastes with high BOD, TSS, TP, and/or TN. In such cases, the customer may be treated like a Category 1 customer and may be sampled and evaluated to determine if it qualifies as a surcharge customer. A customer can be suspected of having a mass loading that could establish it as a surcharge customer for the following reasons:
The customer is similar to another customer that is currently, or has in the past, qualified as a surcharge customer.
The customer has a sufficient BOD, TSS, TP, or TN concentration, or discharge flow volume of sufficient size that it could add enough mass load to qualify as a surcharge customer.
BOD, TSS, TP, or TN results obtained from other sources (i.e., industrial pretreatment monitoring) shows evidence of elevated concentration or elevated mass loads.
For customers that are not surcharge customers, the sampling and testing fee will not be charged for the sampling event when the test results are below the surcharge level of 250 mg/l for BOD and TSS, or 12 mg/l for TP, or 40 mg/l for TN. However, the customer could still be sampled as part of our pretreatment monitoring requirements or for reasons other than strength of waste surcharging. In these cases, the sampling and testing fees would not be waived.
If customers feel that their sampling results were not representative of their operation, they can request reconsideration based on additional sampling results obtained at the customer's expense from accredited outside laboratories. The Authority will review the results to determine if the surcharge should be adjusted or if the customer should be re-categorized or re-ranked.
Surcharge customers will continue to be sampled and tested on a quarterly basis as long as they qualify as a surcharge customer. Category 1 customers that do not qualify as a surcharge customer will be resampled and tested every five years.
The sampling frequency for surcharge customers will be quarterly, unless otherwise specified by an IU permit or through agreement between the Authority and customer.