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Process Specialties, Inc. - 2 - 20 April 2011 <br />Approximately 900 to 1,400 gallons per day of wastewater is generated by cleaning silicon <br />discs. The discharge occurs in batches of approximately 175 gallons each, throughout the <br />day. The wastewater generated in the activity has a low pH (approximately pH 3) and is <br />adjusted to a pH of approximately 10 by adding caustic soda (sodium hydroxide) before batch <br />discharge to the septic tank system. It is anticipated that additional neutralization and dilution <br />occurs in the septic tank. <br />The septic tank permit issued by SJCEHD (which is attached) indicates the domestic <br />wastewater system at the facility consists of two 2,000 -gallon septic tanks, three 100 -foot <br />long leachlines, and an eight -foot deep seepage pit at the terminal end of each leachline. <br />Based on my observations at the site, the primary concern for the wastewater appears to be <br />pH control. Because septic tanks provide biological treatment of wastewater, they operate <br />most effectively when wastewater discharges provide stable waste constituents and flow <br />rates. Better control of the pH will improve biological treatment in the tanks. <br />Wastewater Characterization Report <br />The Wastewater Characterization Report shall consist of the following: <br />• Characterization of wastewater quality <br />• Characterization of groundwater quality <br />• A report of pH neutralization effectiveness and monitoring results <br />The industrial wastewater and the groundwater shall be characterized with the same <br />analytical methods. Characterization of the wastewater is needed to determine if it is <br />consistent with typical domestic wastewater. Groundwater quality must be characterized to <br />allow comparison to the wastewater quality. Please collect samples from the groundwater <br />supply well (the sample must be collected prior to any on-site treatment), and both <br />wastewater collection tanks (the samples shall be collected after pH neutralization). Collect <br />discrete samples, do not composite the samples. <br />The samples shall be collected and maintained under Chain of Custody protocol. You may <br />contact an analytical laboratory to provide sampling services or guidance on how the samples <br />should be collected, preserved, and handled prior to delivery to the laboratory. The samples <br />should be filtered with a 0.45 -micron filter prior to preservation, digestion, or analysis. You <br />may also consider contracting with an environmental consultant experienced with industrial <br />wastewater and regulatory procedures. At a minimum, please sample and characterize the <br />untreated well water and the wastewater as follows: <br />Analyte <br />Units <br />pH <br />Std. Units <br />Electrical Conductivity <br />umhos/cm <br />Total Dissolved Solids <br />mg/L <br />Sodium <br />mg/L <br />Chloride <br />mg/L <br />Sulfate <br />mg/L <br />Fluoride <br />mg/L <br />T1R5S Sections\Permitting Title 27 Confined Animals\Units\Non 15 Permitting\SanJoaquin\Process Spec\Morris 20 Apr 2011.doc <br />