CMUD_Compliance&Monitoring

C:\Documents\Projects\CMUD\CMUD_IBT Petition_final.doc 4-1
SECTION 4
Compliance and Monitoring Plan
The proposed compliance and monitoring plan for the requested CMUD IBT certificate
includes the following elements, which are described in the sections below:
1. IBT Calculation
2. Reporting
The details of monitoring and compliance will be specified in a Compliance and Monitoring
Plan approved by DWR.
4.1 IBT Calculation
CMUD will calculate the daily IBT using a methodology developed in conjunction with
DWR staff. The methodology is based on the guidance developed by DWR for estimating
IBT amounts as part of the Local Water Supply Planning process. Table 4-1 provides an
example of the calculations that will be submitted.
Consumptive use for each day is assumed to be the difference between total water use and
total wastewater discharged, or zero if discharge is greater than potable water use. This may
underestimate consumptive use in the winter months (when water use is typically lower
than wastewater discharge), but the effect will be to slightly overestimate the resulting IBT
amount. When discharge is greater than water use, the portion of raw water withdrawal
that is discharged as wastewater in each basin is assumed to be proportional to the actual
wastewater discharges in that basin. In effect, this is assuming that the same degree of
inflow and infiltration occurs in the sewer system in each basin. These assumptions will not
impact evaluation of compliance with the requested IBT certificate, since the maximum IBT
is expected to occur in the summer.
The portion of consumptive use that occurs in the source basin will be estimated as the
portion of the water service area in the source basin, and will be updated annually to reflect
changes in the development of the service area.
C:\Documents\Projects\CMUD\CMUD_IBT Petition_final.doc 4-2
TABLE 4-1
Sample Daily Calculations for Interbasin Transfer1
Consumptive Use
(mgd)
Wastewater
Discharged (mgd)
Date
Withdrawal
from
Catawba
Basin
(mgd)
Catawba
Basin
Rocky
River
Basin
Catawba
Basin
Rocky
River
Basin
Total Return
to Catawba
Basin
(mgd)
Interbasin
Transfer
(mgd)
IBT as % of
Grandfathered
Amount2
6/1 139.31 57.69 9.39 68.33 3.90 126.02 13.29 83%
6/2 150.65 66.04 10.75 70.35 3.50 136.39 14.25 89%
6/3 149.97 67.48 10.99 66.80 4.70 134.28 15.69 97%
6/4 110.61 32.50 5.29 68.72 4.10 101.22 9.39 58%
6/5 108.20 30.80 5.01 68.09 4.30 98.89 9.31 58%
6/6 104.81 22.28 3.63 74.48 4.42 96.76 8.05 50%
6/7 117.78 33.11 5.39 75.68 3.60 108.79 8.99 56%
6/8 122.77 40.52 6.60 71.45 4.20 111.97 10.80 67%
6/9 133.63 52.07 8.48 68.18 4.90 120.25 13.38 83%
6/10 142.47 60.23 9.80 67.34 5.10 127.57 14.90 93%
6/11 141.19 63.70 10.37 63.62 3.50 127.32 13.87 86%
6/12 144.77 68.49 11.15 60.53 4.60 129.02 15.75 98%
6/13 137.82 53.29 8.68 71.05 4.80 124.34 13.48 84%
6/14 135.65 49.45 8.05 74.95 3.20 124.40 11.25 70%
6/15 120.06 36.28 5.91 72.67 5.20 108.95 11.11 69%
6/16 123.38 42.51 6.92 68.24 5.70 110.75 12.62 78%
6/17 126.49 46.78 7.61 67.10 5.00 113.88 12.61 78%
6/18 126.76 48.79 7.94 64.83 5.20 113.62 13.14 82%
6/19 124.87 41.24 6.71 71.21 5.70 112.45 12.41 77%
6/20 124.43 43.90 7.15 67.88 5.50 111.78 12.65 79%
6/21 135.60 54.00 8.79 67.91 4.90 121.91 13.69 85%
6/22 134.81 51.81 8.43 68.87 5.70 120.68 14.13 88%
6/23 141.49 58.97 9.60 67.52 5.40 126.49 15.00 93%
6/24 142.61 61.75 10.05 65.20 5.60 126.95 15.65 97%
6/25 135.05 57.41 9.35 62.60 5.70 120.01 15.05 93%
6/26 142.37 60.52 9.85 66.29 5.70 126.81 15.55 97%
6/27 129.63 45.49 7.40 71.14 5.60 116.63 13.00 81%
6/28 120.53 35.80 5.83 72.70 6.20 108.50 12.03 75%
6/29 110.51 24.46 3.98 76.37 5.70 100.83 9.68 60%
6/30 111.10 28.33 4.61 72.86 5.30 101.19 9.91 62%
Minimum 8.05 50%
Maximum 15.75 98%
Average 129.64 47.86 7.79 69.10 4.90 116.95 12.69 79%
1. from June 2000
2. Percentage of daily IBT to permitted amount under grandfathered IBT of 16.1 mgd.
C:\Documents\Projects\CMUD\CMUD_IBT Petition_final.doc 4-3
4.2 Reporting
At the end of each calendar year, the daily IBT calculations will be summarized in an annual
report to DWR. The annual report will document the maximum day IBT amount for that
year. The distribution of consumptive uses between the source and receiving basins will be
reviewed and modified to reflect changes in the development of the service area. The
Annual Report will also document compliance with any conditions, if applicable, that the
EMC includes in the IBT certificate.
Once an annual report indicates that a daily maximumIBT has exceeded 80% of theIBT
specified in the certificate, CMUD will begin monthly reporting to DWR during the next
calendar year. At the end of each month, CMUD will report IBT calculations and document
the maximum IBT that occurred during that month. CMUD will also continue to submit
annual reports that review the distribution of consumptive uses between the source and
receiving basins based on service area development in the previous year, and document
compliance with any interbasin certificate conditions, if applicable.