ARCHIVED REPORTS_XR0005026 - Laserfiche WebLink

Home Browse Search

s f' 27 October 2004 AGE-NC Project No 96-0254 Page 7 of 10 f 1 MMTHE as grams 784 g MTBE MMTHE as kilograms 0.78 kg MTBE A conversion factor of 2 205 lb/kg can be used to convert MTBE to pounds ' MMTHE = (0 78 kg MTBE)(2 205 lb/kg) = 1.7289 lbs of MTBE A conversion factor of 0 16 gallons/lb can be used to convert MTBE to gallons (volume) VMTHE— (1 7289 lbs of MTBE)(0 16) =0.27 gallons of dissolved MTBE 6.0. POTENTIAL IMPACT ON NEARBY SURFACE AND GROUND WATER ' Typically, ground water would represent the migration medium for contaminants over significant horizontal distances First encountered ground water at depths less than 200 feet bsg is not used for drinking and less likely may be used for irrigation due to high salinity and total dissolved solids, ' . however, all ground water in the State of California is considered to be of potential beneficial use In April 2000, AGE conducted a sensitive receptor survey as part of the initial site characterization ' requirements under the California Code of Regulations - Title 23, Division 3, Chapter 16, Section 2654 The objective of the work was to identify and locate sensitive receptors, including wells and ' surface water, potentially affected by the UST release, and to identify and locate potential vertical conduits The scope of work included a review of files and records available at the City of Manteca Public Works Department, State of California Department of Water Resources and San Joaquin ' County Department of Health Services, and conducting a visual area reconnaissance for municipal, domestic,irrigation or ground water monitoring wells located within a 2,000-foot radius of the site, and septic systems located on the site ' Drinking water at the site is supplied by the City of Manteca Municipal Water Well Network, City of Manteca Water Well No 13 is closest to the site(2,500 feet southwest) Municipal Water Well ' No 13 poses minimal concern because the well is 2,500 feet away and located cross-gradient of the former UST location Based on analytical data collected from the cross-gradient wells MW-5 and MW-6, the MTBE plume does not appear to have migrated beyond MW-5 or MW-6 Additional wells located by the survey included an agricultural well and two domestic wells 1,750 feet southeast of the site, a domestic well 1,800 feet southwest of the site, and a ' commercial/agricultural well down-gradient and approximately 2,200 feet northwest of the site ' Advanced GeoEnvironmental,Inc