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Mr. Alan R. Van Antwerp, PE - 2 - 6 November 2020 parameters identified in the Cleanup Plan. Alpha Analytical Inc. (Alpha) detected TPHg (up to 18,000 micrograms per liter [pg/L]), TPHd (up to 1,500 pg/L), benzene (up to 6,300 pg/L), toluene (up to 94 pg/L), ethylbenzene (up to 170 pg/L), xylenes (up to 260 pg/L), MTBE (up to 180 pg/L), and TBA (up to 11,000 pg/L) at concentrations that are generally consistent with historical data. Alpha and California Laboratory Services detected general water quality parameters at concentrations that are generally consistent with data collected since 2005 and suggest that biodegradation of petroleum hydrocarbons is occurring under strongly reducing anaerobic conditions. Comments In their 23 July 2015 Request to Modify Monitoring and Reporting Program No. R5-2005-0815, Kinder Morgan requested that biochemical oxygen demand, chemical oxygen demand, total organic carbon, nitrite, and ortho-phosphate be removed from the annual monitoring event analytical suite. In response, Central Valley Water Board staff omitted general water quality parameters from Monitoring and Reporting Order No. R5-2015-0823 (i.e., the Central Valley Water Board has not required analysis for these constituents since 2015). Accordingly, Central Valley Water Board staff approves Kinder Morgan's recommendation to discontinue groundwater sample analysis for chemical oxygen demand, biological oxygen demand, nitrite, and total orthophosphate. If you have any questions, you may contact me by phone at (916) 464-4707 or email me at geoff.radera_waterboards.ca.gov. QROFESS/p o�FREYLWU R„FyG, C 80249 EXP. CiV1� 4"' 0AYDR;kx P41E. 545 Dov 2 0Z -e Geoffrey Rader, P.E. #C80249J Meli�,� Water Resource Control Engineer Seni r Engineering CC' San Joaquin County Environmental Health Department, Stockton Ms. Danielle Catlin -Wright, Arcadis, Roseville