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z <br /> _AE."E, <br /> '® WATERWORK CORP. <br /> RESNA <br /> INDUSTRIES <br /> Rr'E C E-0. 0 <br /> AUG 15 1991 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SEPVICES <br /> August 13, 1991 <br /> Mr. Harlan Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> p,0. Box 2009 <br /> Stockton, CA 95201 <br /> RE: Second Quarter 1991 Monitoring Report, Knowles Property, <br /> 1140 West Hammer Lane, Stockton, CA 95207 <br /> Dear Harlan: <br /> f 1991, quarterly monitoring <br /> ing was v�iesdincluded measuring <br /> at the above <br /> On June 17, (Figure 1). <br /> referenced site <br /> and sampling of all wells. <br /> depth to water and purging roximately 0.1 <br /> The depth to first water at the site had dropped app <br /> feet since the March monitoring event but was 0.5 feet higher than <br /> The groundwater gradient was consistent with <br /> January levels. easterdirection at 0.004 ft/ft. <br /> previous monitoring and is in adient plot was created for o othrhori e <br /> ng <br /> (Table 1)• A ghe <br /> roundwater g <br /> March and June monitoring episodes (Figures 2 and 3)- <br /> data is contained in Attachment 1• MW3 which <br /> All wells at the site, with the exception of MW1 and <br /> purged led. The groundwater samples wand <br /> were dry, were p ged and sampethylbenzene, <br /> analyzed for benzenexylenes (BTEX), <br /> , toluene, asoline (TPHG). Samples were sent <br /> total petroleum hydrocarbons as g for analysis. <br /> to Applied Analytical Laboratories (DHS cert. #1211) <br /> of plan (Appendix 11, October 255. <br /> Sample collection was conducted in accordance with WaterWork's <br /> Quality Assurance/Quality Control <br /> Workplan). Laboratory data sheets and chain-of-custa y <br /> - - 1990 <br /> documentation are contained in Attachment - - - - - <br /> �� xateoeiz-WP <br /> 1710 MAIN STREET • ESCALON,CA 95320 • (209)838-3507 <br /> 2350-A\VALSH AVENUE 6 SANTA CLARA,CA 95051 (408)496-1249 <br />