ARCHIVED REPORTS_XR0002097 - Laserfiche WebLink

Home Browse Search

��?? ,=rr— r��,��77jjttl�� I-Irl�l` ,l SERN10E _ AbG 32 AM 9. 46 ,r Y 5f 1 ,• GROUND ZERO ANALYSIS, INC. 3422 W Hammer Lane, Saute C-294 Stockton, Cahforma 95219 Telephone (209) 952-3481 Facsunde. (209) 952-9891 August 30, 1995 Mr Harlin Knoll San Joaquin County Public Health Services Environmental Health Division P O Box 388 Stockton, CA 95201-0388 Subject Third Quarter 1995 Site Status Report Knowles Property, 1140 W Hammer Lane, Stockton, CA Dear Mr Knoll • This letter report summarizes third quarter 1995 activities at the subject site (Figure 1) Activities during the quarter included groundwater monitoring, well purging, and sampling for benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHG) GROUNDWATER MONITORING � Groundwater monitoring was performed on July 27, 1995 The depth to groundwater beneath the site ranged from 46 88 to 48 93 feet below grade The groundwater flow direction at the time of measurement was generally to the east-southeast at hydraulic gradients ranging from approximately 0 003 to 0 009 feet per foot A groundwater gradient map for July 27, 1995 is presented on Figure 2 Groundwater monitoring data for the reporting period are summarized in Table 1 Historical groundwater monitoring data are included in Attachment A Ground Zero had previously monitored groundwater elevations in well MW4 in April, May and June of 1995 to track relative groundwater elevation trends The shallow water table beneath the site reached a high of approximately -41 18 feet, relative to mean sea level, in well MW4 (45 77 feet below grade) on May 22, 1995 Depth to water measurements in well MW4 between April and June 1995 are included in Attachment B By comparison, the groundwater elevation in well MW4 was -46 41 on September 27, 1994 and -42 50 on July 27, 1995 Overall, groundwater elevations rose an average of 3 90 feet between September 1994 and July 1995 l groundLeSknowies haml3gmr1995 Cpl