April 6, 1998

Charlene Wardlow
Curt Hildebrand
1160 N. Dutton, Suite 200
Santa Rosa, CA 95401


Dear Charlene and Curt:

The following nine data requests numbered 60-68 identify the additional data that was requested by Energy Commission staff and agreed to by Calpine at the workshops held on March 25, and March 31, 1998. The mutually agreed upon due dates for providing the subject information are noted in brackets following each item. The data requests below begin with number 60 as the February 2, 1998 data request letter contained 59 data requests.

Hazardous Materials Handling:

60. Calpine agreed to rerun the accidental release impact analysis incorporating time of deliveries (daytime), the occurrence of meteorological conditions (F stability and one meter per second winds), and tank failure data from the Canvey Study conducted in England. The analysis should also include a narrative discussion of the proposed design criteria for the pressure vessel and the effect that this would have on spontaneous failure of the tank.

In addition to these suggestions, an additional concern was raised by the local community regarding the external hazard posed by crop dusting and the potential of an airplane crashing into the ammonia tank. Please incorporate the data regarding the frequency of accidents associated with crop dusting from the National Transportation Safety Board into the analysis. Additional data will be required regarding the number of air hours necessary for crop dusters to seed and spray the fields in the immediate vicinity of the project (within a 1/4 mile radius of the proposed facility) (due April 15, 1998).

Visual Resources:

61. As agreed, please provide the height of the two dehydrators (due April 15, 1998).

Socioeconomic Resources:

62. Calpine stated that they intend to initiate an outreach program to train and hire local people for operation of the plant. Calpine agreed to provide a copy of the outreach program and training program used for the Pasadena, Texas, plant. It is anticipated that the outreach and training for the Sutter Project would be similar (due April 15, 1998).

Air Quality:

63. Please provide the following information:

a) The new information from Westinghouse to support the air emission levels in Table 1a of data response number 1.

b) Revised Tables 2a. and 2b. of data response number 2, that calculate the maximum daily emissions (both items due April 15, 1998).

64. We also asked for clarification of the plans to elevate the project site terrain by five feet by moving fill material from another location. The air emissions associated with that part of the project were not evaluated or considered in the Application for Certification. Calpine agreed to evaluate the magnitude of these air emissions including air emissions from the borrow area, moving trucks, workers' trucks and all the related activities at the project site. Also please provide a description of the source (or potential sources) of the fill material, the number of yards required, number of truck loads, potential transportation routes for truck deliveries, proposed dust mitigation measures and other pertinent information regarding this construction related activity. This information is also needed to complete our Cultural, Paleontological, biology, geology, traffic and transportaion review (due May 1, 1998).

Water Resources

65. As discussed, please provide a map showing the elevation contours for the 12 acre site (due April 15, 1998).

66. It is our understanding that additional temperature and water quality samples were taken. Please provide the results of these additional tests and a map showing where the various samples where taken. If additional sampling is necessary, please indicate when this information will be available (due May 1, 1998).

67. Also as discussed, please map the contour lines (concentric circles) of the water table depicting the results of the water draw down modeling simulation and the potential affects on nearby wells. It would be helpful for all parties if the assumptions, equations, parameters and data sheets for the groundwater, drawdown analysis were provided. During the workshop, Gary Maurath of Foster-Wheeler indicated that available information on groundwater levels during recent droughts was consulted as part of the groundwater analysis. In response to a Department of Fish and Game, and property owner concerns, it would be helpful if this information was also more fully discussed (due April 15, 1998).

68. Please provide a water quality analysis of the various waste streams--cooling tower, boiler, demineralizer, sanitary, etc.(due April 20, 1998).

Miscellaneous Water Quality Modeling Items

As discussed at the workshop, everyone agreed to provide written comments on the water quality modeling assumptions and protocol by April 15, 1998.

Although the water quality modeling discussion centered around temperature, Arsenic and total dissolved solids (TDS), please incorporate into your modeling five additional toxics of concern to the biologists (Boron, Chromium, Copper, Manganese and Zinc). Department of Fish and Game suggested that the modeling consider drought condition scenarios. Also, consistent with your response to data requests 27 and 28 (public health), please include in your modeling analysis all constituents from the various power plant waste streams.

There was also a discussion of the possibility of conducting an actual pump test to determine the potential short-term impacts to the ground water table and nearby wells. This is a matter that you may want to consider and may help to alleviate some of the concerns raised by the four or five owners of nearby wells.

If you have any questions, feel free to call.


PAUL RICHINS, Jr., Project Manager
Energy Facilities Siting and
Environmental Protection Division

cc: Sutter Power Project Proof of Service List
Mike Negrete, C.R.W.Q.C.B.
Sam Castillo, Dept. of Fish & Game
Peter Maclaggan, CUWA
George M. Carpenter, Sutter County Comm. Services Dist.
Gary Kraus, Sutter Co. Fire/OES
Manny Ruiz, Feather River Air Quality Mgmt. Dist.
Richard Corey, ARB
Jean Woeckener, ARB