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SECOR INTERNATIONAL INCORPORATED
<br /> 57 Lafayette Circle,2"d Ftoor www.secorcom
<br /> S O n Lafayette,Ga 94549
<br /> ,[ 925-299-9300 TEL/925-299-9302 F.nx
<br /> March 9, 2006
<br /> Mr. Mandeep Singh
<br /> ' Geologic Technics
<br /> 1101 7th Street
<br /> Modesto, CA 96364
<br /> ' EVALUATION OF METALS ANALYSIS IN LIEU OF BENCHSCALE STUDY FOR OZONE
<br /> SPARGING
<br /> ' George's Service
<br /> 1600 Durham Ferry Road
<br /> Tracy, CA
<br /> Dear Mr. Singh:
<br /> SECOR International Incorporated (SECOR) has prepared this letter on SOIL METALS
<br /> EVALUATION for George's Service in Tracy, California (the site), in lieu of an Ozone Sparging
<br /> Benchscale Study for Geologic Technics Inc., of Modesto, California (GTI). The letter is
<br /> ' intended to address concerns about the possible mobilization of metals and trace elements in
<br /> soils at a site under evaluation for the application of ozone sparging. The study has been
<br /> designed to address the Regional Water Quality Control Board's (RWQCB) concerns about
<br /> metal mobilization due to in situ oxidation. SECOR was provided analytical data from soil and
<br /> groundwater taken from a boring at the site. This letter provides a geochemical evaluation of
<br /> the metals and trace element data and an opinion as to the mobility of the metals observed in
<br /> soil and groundwater at the site.
<br /> OBJECTIVE
<br /> ' The objective of the geochemical analysis of the soil and groundwater metals and trace element
<br /> data is to evaluate whether the potential for mobilization exists if an oxidant such as ozone is
<br /> ' added to the system.
<br /> The following metal and trace element suite was requested by the RWQCB for analysis:
<br /> aluminum, antimony, arsenic, barium, beryllium, cadmium, calcium, chromium
<br /> (III and VI), cobalt, copper, iron, lead, magnesium, manganese, mercury,
<br /> molybdenum, nickel, potassium, selenium, silver, sodium, thallium, tungsten,
<br /> ' vanadium, and zinc.
<br /> RESULTS
<br /> ' Soil and groundwater were sampled by GTI and submitted to Excelchem of Roseville, California
<br /> for analysis of the full metals and trace element suite listed above. In addition soil samples
<br /> ' were analyzed for total Kjehldahl nitrogen (TKN), total alkalinity, bicarbonate alkalinity (Bi-car.
<br /> Alkalinity), carbonate alkalinity (Car. Alkalinity), hydroxide alkalinity (Hydro. Alkalinity), chloride,
<br /> hardness, nitrate, phosphorus, and sulfate. Groundwater samples were also analyzed for pH,
<br /> specific conductance (S. Conductance), TKN, total alkalinity, Bi-car. Alkalinity, Car. Alkalinity,
<br /> 1 I
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