Reference for Middot 3:3
לְמַטָּה בָרִצְפָה בְּאוֹתָהּ הַקֶּרֶן, מָקוֹם הָיָה שָׁם אַמָּה עַל אַמָּה, וְטַבְלָא שֶׁל שַׁיִשׁ, וְטַבַּעַת הָיְתָה קְבוּעָה בָהּ, שֶׁבּוֹ יוֹרְדִין לַשִּׁית וּמְנַקִּין אוֹתוֹ. וְכֶבֶשׁ הָיָה לִדְרוֹמוֹ שֶׁל מִזְבֵּחַ, שְׁלֹשִׁים וּשְׁתַּיִם עַל רֹחַב שֵׁשׁ עֶשְׂרֵה, וּרְבוּבָה הָיְתָה לוֹ בְּמַעֲרָבוֹ, שֶׁשָּׁם הָיוּ נוֹתְנִים פְּסוּלֵי חַטַּאת הָעוֹף:
Beneath the floor at that [the southwestern] corner, there was a [underground] place [a tunnel] one <i> amah</i> by one <i> amah</i> which had a marble tile with a ring attached to it, through which they would go down to the <i>shit</i> [where the blood would collect] and clean it. There was a ramp on the southern side of the altar which was thirty two <i> amah</i> [long] by sixteen <i> amah</i> wide. There was a little compartment on the western side where they would place the invalid bird sin-offerings.