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r ;�tHl_TI <br /> t <br /> (916) 323-3372 eSSE? <br /> Cal/EPA <br /> Department of September 6, 1996 Pete Wilson <br /> Governor <br /> Toxic Substances <br /> Control lames M. Strock <br /> Ms . Stephen G. Muir Secretary for <br /> 400 P Street, WZI Incorporated Environmental <br /> 4th Floor 4700 Stockdale Highway, Suite 120 Protection <br /> P.O. Box 806 Bakersfield, California 93309 <br /> Sacramento, CA <br /> 95812-0806 RE: DISAPPROVAL OF THE AUGUST 9, 1996 PROPOSED <br /> PERFORMANCE GOALS FOR THE BUSY BEE, GUILD AND <br /> LUSTRE-CAL SITES <br /> Dear Mr. Muir: <br /> The Department of Toxic Substances Control (DISC) <br /> has reviewed your August 9, 1996 proposed performance <br /> goals for soil vapor extraction systems . Upon review <br /> and evaluation of the proposed report, DTSC disapproves <br /> the revised performance goals . <br /> RATIONALES <br /> DTSC' s disapproval of the revised performance <br /> goals is based on: (1) the proposed performance goals <br /> have not incorporated DTSC' s comments made on April 4 <br /> and June 5 , 1996; and (2) they are not consistent with <br /> items previously approved by DTSC. Examples of DTSC' s <br /> comments are provided below: <br /> 1 . Monitoring Frequency for the Extraction and <br /> Monitoring Wells : <br /> The proposed monitoring frequency has been <br /> inconsistent . In the first draft proposal dated <br /> December 15, 1995, it stated that "monitoring data . . . <br /> will be collected weekly or as determined by the pilot <br /> SVE tests" . DTSC commented in the April 4 , 1996 letter <br /> that monitoring data shall be collected on a weekly <br /> bases or more frequently throughout the full scale <br /> operation. <br /> However, in the May 6, 1996 proposal, the <br /> consultants changed the proposed monitoring frequency <br /> to "weekly to biweekly depending upon site - specific <br /> SVE system evaluation and response. " In this August <br /> proposal, the consultant proposed "the monitoring <br /> frequency will be weekly to monthly. . " (Page 5, Section <br /> 4 . 2) . <br /> hvel a..inaM Pm <br />