Laserfiche WebLink
GRANITE CONSTRUCTION FACILITY <br /> WKA No 2088 08 <br /> July 16 1997 <br /> Page 2 <br /> samples obtained from the four monitoring wells are summarized in Table 2 Chain-of-custody <br /> documentation and laboratory reports are included in Appendix B <br /> Domestic Water Well <br /> On March 11, 1997, FGL Environmental Analytical Chemists collected one sample of the water <br /> produced by the on-site domestic water well The water sample was collected from the <br /> breakroom sink and analyzed for bacteriological and petroleum hydrocarbon constituents The <br /> domestic water sample did not reveal any elevated or detectable concentrations of coliform or <br /> BTEX constituents <br /> Conclusions and Recommendations <br /> Based on the analytical results of water samples collected June 20, 1997, it appears that <br /> concentrations of petroleum hydrocarbons in groundwater beneath the site have generally <br /> decreased Benzene was detected in one monitoring well (MW2) It is our opinion that the <br /> decrease in petroleum hydrocarbons can be attributed to the subsidence in groundwater elevations <br /> (approximately 4 feet) and/or natural attenuation We recommend that the sampling frequency be <br /> changed from quarterly to semi-annually Semi-annual sampling should be performed in the <br /> • summer and winter months to evaluate trends in groundwater quality beneath the site with <br /> fluctuating groundwater elevations <br /> Please call if you have any questions regarding this report <br /> Wallace ■ Kuhl & Associates, Inc <br /> Michael Watan Eric Hubbard <br /> Staff Engineer Registered Geologist #4807 <br /> MMW EJH sdin <br /> Copies to Mr Hop Essick, Granite Construction <br /> Ms Elizabeth Thayer, CVRWQCB <br /> k ttii� oxx ax�r <br /> 00 <br /> WALLACE KUHL <br /> Reodcd oj,, &ASSOCIATES INC <br />