---
kind: "section"
citation: "40 C.F.R. § 63.9520"
title: "40"
number: "63.9520"
heading: "What procedures must I use to demonstrate initial compliance?"
url: "https://uscodex.org/cfr/40/63.9520"
---

# §63.9520. What procedures must I use to demonstrate initial compliance?

- (a) If you use a solvent recovery system, you must use the procedures in [paragraphs (a)(1) through (8)](#a-1..a-8) of this section to demonstrate initial compliance with the emission limitations in § [63.9500(a)](/cfr/40/63.9500.md?p=a) and [(b)](/cfr/40/63.9500.md?p=b).
  - (1) **Record the date and time of each mix batch.**
  - (2) Record the identity of each mix batch using a unique batch ID, as defined in [§ 63.9565](/cfr/40/63.9565.md).
  - (3) **Measure and record the weight of HAP solvent loaded into the solvent mixer for each mix batch.**
  - (4) **Measure and record the weight of HAP solvent recovered for each mix batch.**
  - (5) If you use a solvent recovery system, you must determine the percent of HAP solvent discharged to the atmosphere for each mix batch according to Equation 1 of this section as follows:
  - (6) If you use solvent substitution for a mix batch, you must record the use of a non-HAP material as a substitute for a HAP solvent for that mix batch and assign a value of 0 percent to the percent of HAP solvent discharged to the atmosphere for that mix batch (Pb).
  - (7) Determine the 7-day block average percent of HAP solvent discharged to the atmosphere according to Equation 2 of this section as follows:
  - (8) **Have valid data for at least 90 percent of the mix batches over the 7-day averaging period.**
- (b) If you use a control technique other than a solvent recovery system and/or solvent substitution, you may apply to EPA for approval to use an alternative method of demonstrating compliance with the emission limitations for solvent mixers in § [63.9500(a)](/cfr/40/63.9500.md?p=a) and [(b)](/cfr/40/63.9500.md?p=b), as provided in [§ 63.9570](/cfr/40/63.9570.md).

## Notes

### Source

Source: 67 FR 64506, Oct. 18, 2002, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.