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R,UPI <br /> r. Harding Lawson Associates <br /> encountered, was silty, poorly graded, and usually fine grained. <br /> Gravel was only encountered in boring HW-3 at 31 to 33 feet deep. <br /> No positive PID readings were observed from the headspace of <br /> soil samples from MW-2, while the PID readings from soil samples <br /> from MW- <br /> 1 ranged from 0 to 2 ppm. Slightly higher PID readings <br /> were measured in soil samples from MW-3. These readings ranged <br /> from 2 ppm to 15 ppm, but did not correlate to any noticeable <br /> odors. A FID reading of 13 ppm was measured for the soil sample <br /> ` r <br /> collected at 40 feet from MW-3; we, therefore submitted this <br /> sample for chemical analysis instead of the sample from 45 feet <br /> with a reading of 6 ppm. <br /> Groundwater Gradient <br /> on the basis of water level measurements for MW-1, MW-2 and <br /> MW-3, taken on July 3, August 5, and September 3, 1991, the <br /> k'°" groundwater gradient was calculated to be 0.013, 0.035, and 0.64 <br /> "a feet per foot respectively, towards the north-northwest. MW-2 is <br /> z <br /> located less than 20 feet downgradient of the former tank site. <br /> HLA obtained a map presenting lines of equal elevation of water <br /> q <br /> in wells for the fall of 1990 from the San Joaquin County Flood <br /> Control and Water Conservation District. The map indicates that <br /> the regional gradient is east to southeast. <br /> HLA has monitored the flow totalizer on the domestic well <br /> loca-LA approximately 15o feet north-northwest of the former tank <br /> �. site since July 1991. The average daily use of groundwater at <br /> - - this facility is approximately- 1,100 gallons-per---day.---We-beL-neve ; <br /> 9 <br />