CONTACTS 
0201 - PG&E Trans Sys Engineering         415 223 0399 fax or 800...
020101 - Ms. Maria P. Ly;  =415 223 0399

SUBJECTS
Induction Study
Steady State
Fault
Subjects Create

0906 -    ..
0907 - Summary/Objective
0908 -
090801 - Followed up work at ref SDS 17 line 92.  This is a paragraph on the
090802 - Fault condition.  We have steady state.
090803 -
090804 - Left message that Bill wants to submit the meeting notes today.  I
090805 - can meet with her if she needs help finalizing the comments on the
090806 - induction study.
090807 -
090808 -
090809 -
0909 -
0910 -
0911 - 1419 Maria called back
0912 -
091201 - She does not recall discussion about grounding monitoring in manholes
091202 - set out in the notes ref SDS 4 line 811.
091203 -
091204 - She has completed her edits and submitted a complete substitute via
091205 - EM.  I discussed this with Bill.  We agreed to substitute Maria's
091206 - comments.  Here is what is being replaced which has been previously
091207 - reviewed by Kevin, Bill and Lori:
091208 -
091209 - ========================================================
091210 - ========================================================
091211 - Maria Ly advised that the Fault condition may require some mitigation
091212 - grounding.
091213 -
091214 -    She said PG&E has requested information from CDWR needed to
091215 -    finalize the study and develop specific design criteria.
091216 -
091217 -
091218 - Steve Burke with CDWR suggested a special testing method to evaluate
091219 - this touch potential under Fault conditions.
091220 -
091221 -    He explained difficulty arising from pipe insulation that inhibits
091222 -    current flows,
091223 -
091224 -    CDWR is investigating the feasibility of putting grounding monitors
091225 -    in manholes included in the current project design.
091226 -
091227 -
091228 - Maria advised that Fault conditions are difficult to identify through
091229 - testing alone.
091230 -
091231 -
091232 - Touch Potential
091233 -
091234 - Don Tribble with CDWR asked what voltage is expected to occur if a
091235 - person simultaneously touches pipe valves and/or other fixtures that
091236 - span a short distance along the pipeline, such as at manholes?
091237 -
091238 -    Maria indicated this could be from 2 - 3 KV based on current
091239 -    information.
091240 -
091241 - Don asked same question with respect to fixtures located above ground?
091242 -
091243 -    Maria indicated the calculations show this could be about 3 KV.
091244 -
091245 - Mitigation Grounding
091246 -
091247 - Steve asked who is responsible for constructing any mitigation
091248 - (grounding) facilities needed?  He noted that CDWR has never had a
091249 - problem with induced current into pipelines on prior projects.
091250 -
091251 -    Bill DeHart said PG&E will submit the results of the study by Nov
091252 -    1, 1994, to CDWR so they can design a solution into their pipeline
091253 -    project, based on their evaluation of the issue.
091254 -
091255 -
091256 - Obtaining Information from CDWR
091257 -
091258 - Maria and Steve met separately to discuss design issues, and to obtain
091259 - the design information PG&E needs to complete the study, or at least
091260 - develop a list of what is needed and schedule its submission to PG&E
091261 - by CDWR.
091262 -
091263 - =============================================================
091264 - =============================================================
091265 -
091266 - Maria added important substance on stress voltages across pipe
091267 - coating, ref SDS 4 line 820,
091268 -
091269 - She added that CDWR needs to provide information on acceptable stress
091270 - voltage for the pipe coating, to PG&E so the study can be completed,
091271 - per ref SDS 4 line 826.
091272 -
091273 -     I modified action item #14, to cover this point, ref SDS 4 line
091274 -     147.
091275 -
091276 -
091277 - Maria left out the following two lines which she could not recall
091278 - having come up at the meeting.  Moreover the language did not seem
091279 - engineeringly, or professionally aposit to her, so I left it out in
091280 - the final draft.  Reviewed it with Bill, and decided to set it out
091281 - here, and can ask at the next progress meeting to see if it means
091282 - anything to anyone else.
091283 -
091284 - *****************
091285 - Steve Burke with CDWR suggested a special testing method to evaluate
091286 - this touch potential under Fault conditions.
091287 -
091288 -    He explained difficulty arising from pipe insulation that inhibits
091289 -    current flows,
091290 -
091291 -    CDWR is investigating the feasibility of putting grounding monitors
091292 -    in manholes included in the current project design.
091293 - *******************
091294 -
091295 - The next progress meeting is on 940928.
091296 -
091297 -
091298 -
091299 -
091300 -
0914 -