Laserfiche WebLink
Work Plan- Site Characterization II Page 2 <br /> Former Karlson Trucking Facility <br /> Project No. 191.2 <br /> December 6, 1999 <br /> Soil and select groundwater samples from both areas contained detectable <br /> levels of dielectric oil range petroleum hydrocarbons. <br /> A soil gas survey was completed at the site in early March of 1999 to evaluate <br /> locations for the later installation of monitoring wells. Results of the soil gas <br /> survey suggest that there were points with medium to high concentrations of <br /> Total Petroleum Hydrocarbons. Monitoring wells were constructed at each of <br /> these two points (MW-2 & MW-3). In addition, one monitoring well was <br /> constructed at the end of what was interpreted to be a TPH groundwater <br /> plume, based upon contoured soil gas data (MW-4). <br /> Further investigation work was completed on April 19, 1999 to investigate <br /> the initial contamination identified during the initial Phase IIA <br /> Environmental Assessment. One well was installed adjacent to the seepage <br /> pit and four were installed around the suspected point of release. A <br /> groundwater sample from MW-4 contained low levels of diesel range <br /> petroleum hydrocarbons (10.1 ppm). Soil samples from this well at the 10 <br /> foot interval contained 277 ppm dielectric oil while at the 15 foot interval, the <br /> soil sample contained non-detectable levels of TEPH range petroleum <br /> hydrocarbons. Groundwater and soil samples from the remaining wells and <br /> the domestic well contained non-detectable levels of TEPH, BTEX and TPH- <br /> Gasoline range petroleum hydrocarbons. In addition, MW-5 and the domestic <br /> well at the site were tested for pollutant metals. Samples from both wells <br /> contained background to non-detectable levels of pollutant metals. The <br /> RWQCB subsequently indicated that no further action was required to <br /> investigate this area. <br /> The monitoring wells were again sampled in July of 1999. Again, samples <br /> from monitoring wells MW-1, 2, 3 & 5 contained non-detectable levels of <br /> petroleum hydrocarbons. MW-4 contained 7.84 ppm diesel range petroleum <br /> hydrocarbons <br /> On November 15, 1999, personnel from Geo-Phase Environmental Inc. as <br /> well as yourself met with representatives of the RWQCB to discuss the steps <br /> which would be needed to eventually obtain a "site closure" from that office. <br /> This Work Plan has been prepared pursuant to the issues discussed in that <br /> meeting. <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto, Ca 95356 Fax: (209)569-0295 <br />