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�{�,,. `� „:� � <; _ — .� n � .,-yin 6 kic• � :,3";.���.-.r �r '.� ��s�" `st ��'��$ 9�" <br /> s <br /> t <br /> r <br /> Mr.H. C. Winsor <br /> February 23, 1988 <br /> Page 6 <br /> 'liable 1. Approximate Difference l3etweert Static Gruunde+valor Levels <br /> in Municipal Well 12 and Monitoring Well W-4 <br /> Approximate depth from grade to <br /> static groundwater,feet <br /> r ate measured Municipal Well 12 <br /> Monitoring Well W-4 Approximate <br /> SeptemEcir30, 1987 Difference <br /> N- October 6, 1987 58.2 55.6 <br /> October 13, 1987 58.8 SS.7 2'6 <br /> October 20, 1987 58.7 SS.B 3.1 <br /> October 27, 1987 54.0 55.7 2.9 <br /> November 2, 1987 56.7 55.6 -1.7 <br /> November 25, 1987 57.2 55.7 1.1 <br /> December 11, 1987 54.7 55.2 1.5 <br /> December 30, 1987 54.9 54.8 45 <br /> }y February 2, 1988 54.2 54.4 0.1 <br /> 53.13 53.1 -0.3 <br /> -0.1 <br /> Static groundwater in Well 12 is about 3 feet deeper than static groundwater ' <br /> in the late summer and early fall. In winter static groundwater in the m Well W-4 <br /> about the carne depth. Nearby municipal and agricultural two wells is at x <br /> t ! leve] elevation in the dee pumping may lower the water <br /> may not Per aquifer, from which well 12 draws. However, this pumping <br /> Y affect the uppermost shallow aquifer, from which the monitoring wells, <br /> particularly We11 W-4, draw. This is based an a limited amount of data, but ma <br /> # same separation between the deep and the shallow aquifers underlying Weu 12. <br /> I..E. Y suggest <br /> Soil and Groundwater Quality <br /> 2n <br /> Selected subsurface soil samples from the two boreholes chilled in November <br /> analyzed for fuel characterization by U.S. Environmental1987 were <br /> 8015, Madded; and benzene, toluene and xylene (BTX) lection Agency (EPA) Method <br /> California Department of Health Services (DHS) certified Eureka laboraPA tories in Sacramento.at e <br /> � ^= Total . fuel hydrocarbons are ons and BTX were not identified in four soil samples analyzed. <br /> �. Laboratory reports are shown in Exhibit C. p <br /> F Groundwater samples from monitoring Wcus W-1 t _ <br /> Personnel an November 13, 1987. Groundwater samples were arralyzedwere cforB by 13C <br /> - Method 602) and fuel characterization (EPA Method Sfl15, TX (EPA <br /> summarized in Table 2 and laboratory re Modified?• Results are _ <br /> f tions in samples from-Wells- concentra- <br /> D' _ lis_ are shown-in-l�zhibit-D.-- _ - --- -- <br /> - drnlcin water. W=1;-W-2, W-3, Wim, and W-5 exceeded DHS act on levels for <br /> g Toluene and xylene concentrations exceeded DHS action levels for water in Wells W-1, W-2, and W-3, No action levels have <br /> hydrocarbons. been established for tottai fue <br /> t. <br /> BROWN AND CALDWELL <br /> 723 5 STREET SACRAMENTO.CA _-B11.(g,$, <br />