SITE INFORMATION AND CORRESPONDENCE 1994-2010

Home Browse Search

Weldon Church Property Page 3 104 West Beverly Place March 3, 2010 Tracy, California 95376 proposes to collect soil samples at five-foot intervals from five to approximately twenty-five feet bsg for lithological evaluation. Soil samples will be field-screened for volatile organic compounds using an organic vapor meter equipped with a photo ionization detector, but are not proposed to be sent to a laboratory and analyzed for chemicals of concern. If field observations indicate a likelihood of significant contaminant impact to soil, samples should be submitted for analysis for the contaminants of concern for this site for assessment purposes. AGE proposes to analyze groundwater from the proposed well and MW-4 prior to, and at the time of the RegenOxTM injections, for the following: • TPH-g, BTEX, MTBE, TAME, TBA; • Inorganic ions: chloride, nitrate, nitrate-nitrogen, and sulfate; • Total and speciated alkalinity as calcium carbonate; • Metals: calcium, iron, magnesium, manganese, potassium, and sodium; • Ammonia as nitrogen; • Chemical oxygen demand (COD); • Dissolved oxygen (DO); • Total chromium; • Hexavalent chromium • Oxygen-reduction potential (ORP); • pH; • Specific conductivity; and • Total dissolved solids (TDS). In addition to analyzing groundwater collected from the proposed well and MW-4 for the above-listed analyses, unless waived by the CRWQCBCVR for their General Order requirements, include: 1-chloropropane, propene, bromate, total organic carbon (TOC), sulfide, orthophosphate, phosphorous, bicarbonate, total hardness, nitrite, metals: arsenic, barium, cadmium, copper, lead, mercury, molybdenum, nickel, selenium and silica; and the entire suite of compounds listed for the United States Environmental Protection Agency method 8260. Report concentrations for constituents listed in the table of Number 15 of the General Order at the numerical water quality objectives listed, and the maximum practical quantitation limits listed in Table 2: Analytical Methods found in Attachment C of the General Order. AGE proposes to collect field parameters and groundwater samples from the proposed well and MW-4 to establish background/baseline site conditions prior to initiating RegenOxTM injections. Field parameters to be measured prior to and at the time of the injections are depth-to-water measurements for all the monitoring wells; and prior to collecting each purge volume from MW-4 and the proposed well, the temperature, pH, ORP, and DO of the groundwater. The EHD approves these field parameters and the analyses listed in the previous paragraph to establish background/baseline parameters. In summation, the EHD approves the installation of the proposed monitoring well, the proposed preliminary aquifer volume test, and the collection of groundwater samples from the proposed monitoring well and MW-4 to establish background/baseline site conditions.