Laserfiche WebLink
Metadata
Document management portal powered by Laserfiche WebLink 9 © 1998-2015 Laserfiche. All rights reserved.
collected from boring MW-13 at a depth of 80.5 feet contained 0.4 mg/kg <br /> of toluene and 0.4 mg/kg of xylenes. <br /> The ground-water sample from well MW-12 did not contain detectable <br /> concentrations of TPHG, TPHD, or BTEX. The samples from wells MW-10 <br />' and MW-11 did not contain detectable concentrations of TPHD. The <br /> samples from wells MW-10, MW-11 , and MW-12 contained concentrations <br /> of TPHG and BTEX. The highest concentrations were detected in the <br /> sample from well MW-13, which contained 19,000 milligrams per liter (mg/1) <br /> of TPHG, 580 mg/I of benzene, 3,000 mg/1 of toluene, 440 mg/I of <br /> ethylbenzene, and 3,100 mg/I of xylenes. The sample from well MW-13 <br />' contained 1 ,400 mg/1 of a petroleum hydrocarbon which was quantified as <br /> diesel but was reported by the laboratory to be a lower boiling point <br /> hydrocarbon mixture. <br /> 3.6 Well Elevation Survey <br />' As part of the prefield activities for the site, top-of-casing and ground <br /> surface elevations were measured for each of the previously installed <br /> ground-water monitoring wells. These elevations were surveyed to the <br /> nearest 0.01 foot relative to the city of Stockton benchmark <br /> number B.B.1-11 located in a planter at the front of the Fair Oaks Library <br /> at 2370 East Main Street in Stockton_ The surveying was conducted on July <br /> 29, 1992, by Yolo Engineers and Surveyors. <br /> The new ground-water monitoring wells (MW-12 and MW-13) were <br />' surveyed by Yolo Engineers and Surveyors on August 26, 1992. The <br /> top-of-casing and ground surface elevations for each of the wells were <br />' surveyed to the nearest 0.01 foot relative to the same benchmark used <br /> during the previous survey. The ground surface and top-of-casing elevations <br /> for all of the on-site monitoring wells are presented in Table 1. <br /> 1 ' <br /> ip1010f9010f900020.1 ag 3 - 4 Rev. 0 December 15, 1992 <br />