Laserfiche WebLink
0 0 <br /> Ms. Julie Raining -2 - 3 May 2005 <br /> 1. Results of samples collected from a minimum of one upgradient, two downgradient, and <br /> two monitoring wells within the ozone sparging area and analyzed for general minerals, <br /> aluminum, antimony, arsenic,barium,beryllium, cadmium, calcium, chromium (III <br /> and VI), cobalt, copper, iron, lead,magnesium,manganese,mercury, molybdenum, <br /> nickel,potassium, selenium,silver, sodium, thallium,tungsten, vanadium, and zinc. The <br /> laboratory needs to meet the analytical method practical quantitation limits listed in <br /> SW-846. GPC needs to report metal results as dissolved concentrations. Results of these <br /> analyses should be used to evaluate if naturally-occurring minerals will go into solution <br /> as a result of the ozone injection and the resulting effects on the aquifer. <br /> 2. An estimate of the change in electrical conductivity measurements and mass of other <br /> constituents/parameters,-including chlorides, sulfides,total dissolved solids, etc. which <br /> will be released into the aquifer as a result of the ozone injection, and the rationale for the <br /> estimate. <br /> 3. Estimates of changes in pH in groundwater and the radius of influence for the proposed <br /> ozone injection. <br /> 4. An assessment of the site specific effectiveness of ozone sparging for eliminating <br /> chloroform pollution and any breakdown products of this process. <br /> This sampling needs to occur during the next scheduled ozone system sampling event and <br /> include with the next semi-annual monitoring report due by 1 August 2005. If you have any <br /> questions,you may contact me at(916) 464-4719 or dlewis@waterboards.ca.gov. <br /> DEVRA LEWIS <br /> Environmental Scientist <br /> cc: Mr. Mike Inf rma, San Joaquin County Health Department, Stockton <br /> Ms. Barbara Mickelson, Acton Mickelson Environmental, Inc., El Dorado Hills <br />