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DAMES &. MOORE - k <br /> 9300 TECH CENTER DR., SUITE 100. SACRAMENTO, CALIFORNIA 95826 (91b) 364-8698 <br /> April ''25, 1990 <br /> BREUio National Corporation <br /> 221 Old Yard Drive <br /> Bakersfield, CA 93307 J U L 6 190n <br /> Attention: Gerald V. Todd, Ph.D. 1 ENVIRONMENTAL HEALTH <br /> - President PERMIT/SERVICES <br /> Report <br /> Monitoring Well Water Analyses - <br /> Holt Brothers Tractor Company <br /> 1521 West Charter Way <br /> Stockton, California . <br /> Job No. 18025-004-044 <br /> Dear Dr. Todd: <br /> Dames & Moore is pleased to submit this report on the results of chemical <br /> analyses run on water samples collected at the above referenced facility. The <br /> _• samples were drawn from six monitoring wells and were analyzed for Total <br /> Petroleum Hydrocarbons (TPH) , selected volatile organic compounds, organic lead, <br /> ethylene dibromide and fecal coliform. <br /> The chemical analyses show well MW-l - to contain substantially lower <br /> concentrations of TPH and volatile organic compounds when compared to analyses <br /> ii <br /> run in December 1988. Well MW-2 had low levelsilof Total Petroleum Hydrocarbon <br /> (gasoline and diesel) , while results for wells::BMW-3., MW-4, MW-5and MW-6 were <br /> "non-detect for the tested constituents. <br /> Groundwater levels, were measured in each'. well on two separate dates in <br /> February 1990 (six days apart) . Groundwater gradient contour maps were generated <br /> for both dates and confirm that the local gradient trends towards the south- <br /> southwest. The south-southwest gradient was originally documented in the January <br /> 1989 Site Investigation report:-and the November' 1989 Phase II report. <br /> Based upon this round of water sampling and the previous round, we conclude <br />•• that the groundwater contamination from the former underground storage tanks <br /> remains limited to an area immediately beneath' the six-tank excavation pit in <br /> ` which MW-1 is located. The lack of contaminatIion in the down-gradient wells, <br /> MW-5 and MW-6, supports this conclusion. <br />_ — Low levels of TPH/gasoline and TPH/diesel hydrocarbons were detected in <br /> the groundwater sampled from MW-2. TPH/gasoline levels were slightly elevated <br /> over those levels detected during the initial sampling performed in 1988, though <br /> previously detected purgeable aromatic organic''compounds (BTXE's) were not <br /> c ,a <br />• OFFICES WORLDWIDE <br /> I - <br /> I <br />