|
12 December 2014
<br />AGE Project No. 12-2169
<br />Page 2 of 7
<br />To establish background concentrations for hexavalent chromium, bromate and other
<br />adverse constituents of concern a background monitoring event will be performed prior
<br />to the start of shallow and intermediate pilot injections. For the shallow injection zone,
<br />wells B3R/VW-1 D, B4R/VW-2D, B5R/VW-3D, MW -4R -D and MW -7S will be analyzed
<br />for the constituents listed below (Figure 1). For the intermediate injection zone wells
<br />MW -81, MW -91 and MW -101 will also be monitored for the constituent list below
<br />(Figure 2).
<br />Field Sampling and Laboratory Analysis:
<br />Field Parameters:
<br />• Depth to water will be measured in shallow and intermediate groundwater
<br />monitoring wells.
<br />• Prior to each purge volume, temperature, pH, TDS, oxygen reduction potential
<br />(ORP), salinity, turbidity, and dissolved oxygen (DO) will be recorded at both
<br />monitoring wells.
<br />Laboratory Testing:
<br />• Total petroleum hydrocarbons quantified as gasoline (TPH-g) by EPA method
<br />8015 modified;
<br />• Benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA method 826013;
<br />• Volatile organic compounds by EPA method 826013;
<br />• Inorganic ions bromate, bromide, chloride, nitrate, nitrate as nitrogen, nitrate as
<br />NO3-, and sulfate by EPA method E300.1;
<br />• Aluminum, antimony, arsenic, barium, beryllium, cadmium, chromium III, calcium,
<br />cobalt, copper, iron, lead, magnesium, manganese, mercury, molybdenum,
<br />nickel, potassium, selenium, silver, sodium, thallium, acetone, tungsten,
<br />vanadium by EPA method 200.7/8; and
<br />• Hexachrome by IC by EPA method E218.6;
<br />CVRWQCB Comment 2: Calculations documenting the rationale for the 200 -gallon
<br />injection events (e.g. stoichiometric calculations). Central Valley Board staff want to
<br />ensure that an appropriate volume of hydrogen peroxide is injected to assess the
<br />remedial approach while minimizing the potential to mobilize hydrocarbon mass.
<br />The proposed three bi-weekly injections of 200 -gallons (per well) of a diluted peroxide
<br />solution previously proposed in the, In -Situ Chemical Oxidation Pilot Test Work Plan,
<br />Advanced GeoEnvironmental, Inc.
<br />
|