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I <br /> 1 <br /> fecal coliform sampling was required by the SJCPHSEHD. <br /> Fecal coliform samples were <br /> containers Collected in sterile sample <br /> and immediately delivered to California Water <br /> Labs for analysis by state methodology. <br /> 3.4 Quality Assurance/Quality Control Program <br /> i � <br /> WaterWork's Quality Assurance and Quality Control (QA/QC) <br /> Plan, Appendix y, outlines the field and laboratory <br /> j . procedures followed to obtain representative data. The <br /> previously referenced monitoring and sampling protocols <br /> : (Appendix Ix) outline additional QA/QC procedures. The <br /> field investigation was conducted under the direct <br /> ' F supervision of Russell Juncal, <br /> Geologist No. 3864, and Nora H. Kaaoka a Registered <br /> FH Registered Civil Engineer No. 38322. California <br /> f' <br /> 4.0 Subsurface Conditions <br /> ` 4.1 Field Inspection <br /> The native soils encountered during drilling consisted <br /> predominantly of clays, silts and silty fine to medium sand <br /> to 36.0 feet, the maximum depth explored. Boring MW.4 <br /> encountered 'pea.gravel -.fi11material to a,:depth" of-`16 feet. <br /> A gravel fill layer of varying depth was also <br /> in <br /> Four of the other borings. A cross sectional view (A-A't and <br /> B-8') of the soil stratigraphy as shown on Figure 2 is <br /> depicted on Figure 4. <br /> 4 <br /> +� PID readings ranged from 0 to- 264'.ppm (,15 <br /> foot sample MW4). The : <br /> were noted highest levels. of hydrOcaib6n odors <br /> and ' <br /> in the interval between '10 " <br /> grade. ` -1�=be3.aw, <br /> 'Ihe depth to first groundwater beneath the site ranges from <br /> )AX, <br /> % Wd!r�ltmh-.ai�tt below grade. Depth to water measurements for <br /> monitorings conducted in October and November 1989 are <br /> presented in Table 1. <br /> Groundwater gradient maps were <br /> prepared using the Kriging method (Figures 5,6,7 and 8). <br /> The gradient map for the October 18, 1989 monitoring taken <br /> w^ the day of drilling shows a northwesterly flow at <br /> hough <br /> groundwater levels in all the wells may not havebeen 7 <br /> completely stabilized <br /> d <br /> Show <br /> monitorings show ..The gradient maps for the three other <br /> (-towards MW3) <br /> MW2 and MW3 aiW-d6Vh grads fr diesel aylcbot pit.we g` <br /> 4.2 Laboratory Analysis - Soil <br /> The laboratory analysis of samples collected at 10.0 and <br /> 15.0 feet in the soil and well borings did not record.the <br /> ti presence of :benzene' or toluene above the 0.02 Ppm method C*/Z <br /> -- � <br /> 4 tib •� S� <br />