Laserfiche WebLink
f7^fir�r!rJ ~e , I Lei <br /> GROUND ZERO ANALYSIS, INC. r i, �iCc <br /> 07 <br /> 2291 W March Line,Suite 127D ' 1: (1(1 <br /> Stoo-kton,Caliform.► 95207 <br /> Telephone (209) 952-3481 <br /> Facsimile (209)952-9891 <br /> February 27, 1997 <br /> Mr Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject Fourth Quarter 1996 Site Status Report, Knowles Property, 1140 W Hammer <br /> Lane, Stockton, California <br /> Dear Mr Knoll <br /> This letter report summarizes fourth quarter 1996 activities at the subject site (Figure 1) Activities <br /> • during the quarter included monitoring depth to water in all wells, purging and sampling wells <br /> MW 1, MW2, MW4, MW5, and MW8, and analyzing samples for total petroleum hydrocarbons as <br /> gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX) <br /> GROUNDWATER MONITORING <br /> Groundwater monitoring was performed on December 30, 1996 The depth to groundwater <br /> beneath the site ranged from 41 13 to 43 18 feet below grade Overall, groundwater elevations <br /> rose an average of 2 59 feet since August 28, 1996 The groundwater flow direction at the time of <br /> measurement was generally to the southeast with a hydraulic gradient of approximately 0 006 feet <br /> per foot (32 feet per mile) A groundwater gradient map for December 30, 1996 is presented on <br /> Figure 2 Groundwater monitoring data are summarized in Table 1 <br /> GROUNDWATER SAMPLING AND ANALYSIS <br /> Monitoring wells MW 1, MW2, MW4, MW5, and MW8 were purged and sampled on December <br /> 30, 1996 All purge water was contained on site in labelled drums approved by the Department of <br /> Transportation Well purge logs are included in Attachment A Groundwater samples were <br /> submitted to Argon Laboratories (FLAP #1873) and analyzed for TPHg and BTEX using EPA I <br /> methods 8015 modified and 8020, respectively <br /> growidz�\knowlea hmn\4grn1996 <br />