Laserfiche WebLink
-gg <br /> October 4, 1991 <br /> .Is. Laurie Cotulla Page 3 <br /> Tri Valley Growers, Thornton, CA �. <br /> Todd's "Groundwater hydrology" that explores well loss and that <br /> doubling well radius will increase discharge only 10 percent. <br /> The existing well is effectively influencing the impacted groundwater. <br /> This is evident by the groundwater gradient maps presented in <br /> VVaterWork°s second quarter report. At this time the installation of a <br /> new well is not warranted. <br /> Monthly status reports will be submitted, beginnin" with the third <br /> quarter monitoring report. <br /> 6, Question: The 5,000 gallon underground storage tank#4 contained both gasoline,ol <br /> and diesel. In order to investigate the possibility <br /> diesel <br /> contamination of groundwater, commence analysis of TPH-diesel in <br /> addition to contaminants already analyzed. <br /> Response: <br /> In a phone conversation with Mary Meays of your office,it was agreed <br /> upon that only MW-4 would be sample for TPHD. The results will be <br /> presented in the third quarter monitoring report. <br /> 7, Question: In the July 27, 1989 PHSlEHD letter, a request was made to show that <br /> high soil lead levels: <br /> 8.9 ppm tank#2 <br /> 7.5 ppm tank#3 <br /> 5.4 ppm MW 1 at 11 feet <br /> 5.4 ppm MW 3 at 6 feet <br /> 5,6 ppm MW 4 at 6 and 10.5 feet <br /> 6.8 ppm soil stockpile 1-8 composite <br /> 7.7 ppm soil stockpile 9 <br /> were background levels. These levels exceed the soluble threshold <br /> limit concentrations (STLC) but are below the total threshold limit <br /> concentration (TTLC) as outlined in the California Code of <br /> Regulations, Article 11,Section 66699. Soil samples must undergo the <br /> Waste Extraction Test (WET) to determine which portion of total lead <br /> is soluble as outlined in the California Code of Regulations, Article 11, <br /> -- -- -- - -Section 66700. <br /> TQR1002.wP <br />