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v _ <br /> July 11, 1991 <br /> Quik Stop Market No. 132 Page 6 <br /> Project No. 3-49132-31 <br /> sewer lines (MW-IR, MW-2, MW-4, and MW-5) were further analyzed for fecal <br /> coliform as required under San Joaquin County Ordinance No, 1862. <br /> SUMMARY OF ANALYTICAL RESULTS <br /> Tabulated results for all laboratory analysesar presented ncluded in Tables <br /> IC and 2. <br /> Laboratory reports and chain-of-custody documents <br /> Exploratory Boring Soil Samples <br /> Soil samples were analytoddetected for <br /> �� in any oBthe soil samples ar_alyzedTEX. As shown in e 1, TPHG and - <br /> BTEX compounds were <br /> Groundwater Samples <br /> les collected fror" <br /> Groundwater samp':.s were analyzed for TPHG, were <br /> BTEX, and <br /> alyzed for fecal coliform. <br /> wells located within 50 feet of a sanitary se <br /> As can be seen in Table 2, TPHG or BTEX compounds were not detected to any of the <br /> samples except for <br /> 'IAW-5 in which TPHG, benzene, and total xylenes were detected at <br /> concentrations of 210 ppb, 3.4 ppb, and 2.1 ppb, respecti Fecal coliform was only <br /> detected in MW-2 at a concentration of 174 bacteria p <br /> er 100 ml. <br /> DISCUSSION <br /> The soils observed daring the drilling of MW-1R and MW-5 generally consisted of 11 <br /> to sand. <br /> feet of moist, sandy clay to clayey sand overlying of moist,to 3 feet f clayey moist sand to lty s silty sand <br /> This was underlain by approximately 5 feet to 6 feet <br /> in which groundwater was encountered wet sand which continued t the depths explored <br /> - approximateleneath this was a moist silty clay <br /> y 3 feet thick overlying approximately 14.0 to <br /> Static water levels in all of the monitoring wells varied from app Y <br /> 14.4 feet below the surface on April 8, 1991. The apparent groundwater flow direction <br /> is east at a gradient of approximately 0.0038. <br /> ogic <br /> Laboratory analytical results of soil and gro u water samples, <br /> ex s beneath the site.with <br /> t Boring <br /> logging of the boreholes o suggest that two aquifers <br /> and monitoring well construction h nein Figure combinedls and detailed in observations <br /> l�igures 5 and resulted. The <br /> Ile cross-sections located <br /> resultant stratigraphy is typical of river at <br /> deposits consisting of interlayered s <br /> In this instance, it appears that an ancient. stream <br /> of sands, silts, and clays. ecreased coarser flowed <br /> across and eroded into the clayey to alto nt ould serve aen as flow s a collection area s rainwater <br /> er <br /> were deposited. The resultd sands <br /> ant to p <br /> which, after infiltrating down through the. overlying sandy soil, would have its <br /> — ,.1 <br />