(

a) Any person convicted of a violation of subdivision (

a) of

Section 11379.6, or of a conspiracy to violate subdivision (

a) of

Section 11379.6, with respect to any substance containing a controlled substance which is specified in paragraph (21), (22), or (23) of subdivision (

d) of

Section 11054, or in paragraph (1) or (2) of subdivision (

d) or in paragraph (3) of subdivision (

e) or in paragraph (2) of subdivision (

f) of

Section shall receive an additional term as follows:

(1) Where the substance exceeds three gallons of liquid by volume or one pound of solid substances by weight, the person shall receive an additional term of three years.

(2) Where the substance exceeds gallons of liquid by volume or three pounds of solid substance by weight, the person shall receive an additional term of five years.

(3) Where the substance exceeds gallons of liquid by volume or pounds of solid substance by weight, the person shall receive an additional term of years.

(4) Where the substance exceeds gallons of liquid by volume or pounds of solid substance by weight, the person shall receive an additional term of years. In computing the quantities involved in this subdivision, plant or vegetable material seized shall not be included. (

b) The additional terms provided in this

section shall not be imposed unless the allegation that the controlled substance exceeds the amounts provided in this

section is charged in the accusatory pleading and admitted or found to be true by the trier of fact. (

c) The additional terms provided in this

section shall be in addition to any other punishment provided by law. (

d) Notwithstanding any other provision of law, the court may strike the additional punishment for the enhancements provided in this

section if it determines that there are circumstances in mitigation of the additional punishment and states on the record its reasons for striking the additional punishment. (

e) The conspiracy enhancements provided for in this

section shall not be imposed unless the trier of fact finds that the defendant conspirator was substantially involved in the direction or supervision of, or in a significant portion of the financing of, the underlying offense.