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Mr. Bob Spencer 2 8 July 2009 <br /> West Coast Tomato, Stockton <br /> Our comments are presented below. <br /> 1. Central Valley Water Board staff concurs with West Coast Tomato's proposal to install <br /> an additional monitoring well to define the lateral extent of the groundwater plume. By <br /> 15 October 2009, West Coast Tomato needs to install the monitoring well, analyze the <br /> soil and groundwater samples, and submit a report of findings. In addition, the new <br /> monitoring well needs to be added to the quarterly monitoring schedule and the data <br /> included in the quarterly monitoring reports. <br /> 2. West Coast Tomato needs to analyze a minimum of three soil samples during the <br /> drilling of the new monitoring well and one sample needs to be from the capillary fringe. <br /> 3. Central Valley Water Board staff concurs with West Coast Tomato's proposal to collect <br /> monitored natural attenuation (MNA) data from groundwater monitoring wells. West <br /> Coast Tomato needs to collect a minimum of four quarters of MNA data from all Site <br /> monitoring wells to determine if biodegradation of petroleum hydrocarbons is occurring. <br /> Groundwater samples need to be analyzed at a minimum for dissolved oxygen, oxygen <br /> reduction potential, nitrate, ferrous iron, sulfate, methane, microbial plate count, <br /> alkalinity, TPHg, TPHd, benzene, ethylbenzene, toluene, xylenes, and the five <br /> oxygenates. <br /> In summary, by 15 October 2009, please install the additional monitoring well and submit the <br /> report of findings. In addition, West Coast Tomato should begin collecting MNA data from all <br /> Site wells during the third quarter 2009 and present the results in the quarterly monitoring <br /> reports. <br /> If you have any questions, you may contact me by phone at (916) 464-4819 or by email at <br /> kshelton(cDwaterboards.ca.gov. <br /> KRISTI SHELTON <br /> Water Resources Control Engineer <br /> Aboveground Tanks Cleanup Unit <br /> cc: Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Patrick Riddle, Law Office of Patrick D. Riddle, P.C., Acampo <br /> Mr. Eric Price, Ground Zero Analysis, Escalon <br />