Laserfiche WebLink
knKLEINFELDER <br /> June 13, 1991 <br /> File: 24-220111-B00 <br /> Ms. Margaret Legoraunty o 14 j <br /> San Joaquin County Public Health Services <br /> Environmental Health Division , <br /> P.O. Box 2009 j U N 17 W1 <br /> Stockton, CA 95201 <br /> SUBJECT: NOMELLINI CONSTRUCTION r Ciilr; i / awl . . <br /> 1045 CHARTER WAY <br /> STOCKTON, CALIFORNIA <br /> Dear Ms. Legorio: <br /> As we discussed, I am sending this letter as a quarterlyy update for the Nomellini <br /> Construction UST site at 1045 Charter Way in Stockton, Califorma. <br /> In February of 1991, Kleinfelder installed and sampled three monitor wells on the site. <br /> The gradient, calculated from measurements collected prior to sampling on February 21, <br /> 1991, indicated a relatively moderate gradient (0.36%) to the east. However, the analytical <br /> data indicated that the highest concentrations of gasoline ( 10,000 ug/L) and benzene <br /> ( 13,000 ug/L) were in the sample collected from MW-2 (north of the excavation). <br /> Kleinfelder had the opportunity to collect a second set of water level measurements on <br /> April 19, 1991. The second set indicated the gradient was significantly steeper (1.08%) and <br /> had shifted direction to the southeast. <br /> Additionally, permeability tests were conducted on three soils samples to assess the site's <br /> conduciveness to remediation through vapor extraction. Permeabilities were found to <br /> range significantly; however, the soils adjacent to the water table were found to be <br /> relatively loose. Vapor extraction is still being considered as a viable alternative. <br /> A well survey was conducted to ascertain the locations of wells within a 2000400t radius of <br /> the site. Eleven wells six domestic, three monitor, one industrial, and one unknown) were <br /> found. The plate displaying the locations of the wells is attached. As the monitor wells <br /> (Attached Plate #s 1, 2, and 3) are upgradient of the Nomellim site, Kleinfelder would <br /> appreciate the County's assistance in acquiring the chemical information collected from <br /> them. <br /> Based on the inconsistency between the current gradient information and the analytical <br /> results, Kleinfelder proposes to collect a second set of water samples, and additionally <br /> water level measurements, for comparative purposes, and include that information in the <br /> pending report. <br /> Sincerely, <br /> INFELDER, INC. <br /> Dana W. Booth <br /> Project Geologist <br /> DWB:mg <br /> F19-91-61 <br /> Copyright 1991 Kleinfelder , Inc . <br /> KLEINFELDER 9795 Business Park Drive, .Sacramento, CA 95827 (916) 366-1701 <br />