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y <br /> Nati® s Groundwater Associates <br /> HYDROGEOLOGISTS&GEOLOGISTS <br /> May 31, 1991 <br /> 4 :d9 <br /> J It N 3 t94f <br /> Mr. Harlan Knoll ENVIRONMENTAL HEALTH <br /> San Joaquin County Public Health Services PER(V1IT/SEFiV!CES <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> ' Stockton, California 95201 <br /> Subject: Bi-Annual Ground-Nater Monitoring Report <br /> Lockeford Beacon Mini-Mart <br /> 13975 Highway 88-E <br /> Lockeford, California <br /> t <br /> NGA Project No. 10-90-104 <br /> Dear Mr. Knoll:" <br /> 1 Nations Groundwater Associates (NGA) has been authorized to submit <br /> this Bi-Annual Ground- Fater Monitoring Report on behalf of Mr. j <br /> 'w <br /> Robert FTrtillips, gwner of the subject site. Figures 1 and 2 show t <br /> the site location and site facilities. The following sections of <br /> r' this report describe the results of the most recent sampling event <br /> at the site. <br /> I BOOM OL ar <br /> The scope of work for this report includes the following <br /> activities. . <br /> a Collection of water level elevation data in April, 1991. <br /> s Preparation of a map depicting. the elevation of the <br /> ground-water surface at the site in April, 1991.: <br /> s Purging of a minimum of three easing volumes of wator <br /> from each monitoring well- and collection of ground-water <br /> ` samples.. Ground-water samples were stored .in an iced <br /> cooler under Chain-of-Custody until delivery to a <br /> California-certified laboratorv. Ground-water samples <br /> were.analyzed for benzene, toluene, ethylbenzen9, xylenes <br /> (BTEX) ; and. total purgeable liyclrocarbons .(TPH) by EPA <br /> method 8260. <br /> i <br /> s Preparation of this bi-annual monitoring report. <br /> 4. <br /> 305OFite Cheie,Suite 104 Sacramento,Call[ornia 93827 (916)361.8095 <br /> (916)3634912 FAX <br />