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Ms. Laurie Cotulla October 4, 1991 <br /> Tri Valley tGrowers, Thornton, CA' Page-3 <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 /> WaterWork's second quarter report. At this time the installation of a <br /> new well is not warranted. <br /> Monthly status reports- will be submitted, beginning with the third <br /> quarter monitoring report. <br /> 6. Question: The 5,000 gallon underground storage tank #4 contained both gasoline <br /> and diesel. In order to -investigate the possibility of diesel <br /> contamination of groundwater, commence analysis of TPH-diesel in <br /> addition to contaminants already analyzed. <br /> Response: In a phone conversation with Mary Mcays 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 PHS/EHD 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 1-1, Section 66699. Soil samples must undergo the <br /> Waste Extraction Test (WET)oto d6termine which poition-of total lead <br /> • is soluble as outlined in the California Code of Regulations, Article 11, <br /> Section 66700. <br /> TQR1002.WP <br />