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N 8 i R dV ATER ESNA W INDUSTRIES ORK CORP. I VE.UPA AUG 15 t9st ENVIRONMENTAL. HEALTH PERMIT/SIRVICES August 13, 1991 .i Mr. Harlan Knoll '{ San Joaquin County Public Health Services Environmental Health Division ' P.O. Box 2009 Stockton, CA 95201 RE: Second Quarter 1991 Monitoring Report, Knowles Property, 1140 West Hammer Lane, Stockton, CA 95207 Dear Harlan: On June 17, 1991, quarterly monitoring was conducted at the above t referenced site (Figure 1). These activities included measuring � depth to water and purging and sampling of ail wells. The depth to first water at the site had dropped approximatel0.1 feet since the March monitoring event but was 0.5 feet highery than g January levels. The groundwater gradient was consistent with Previous monitoring and is in an easterly direction at 0.004 ft/ft. � a (Table 1). A groundwater gradient plot was created for both the March and June monitoring episodes (Figures 2 and 3). Monitoring ,L data is contained in Attachment 1. All. wells at the site, with the exception of MW1 and MW3 which t r were dry, were purged and sampled. The groundwater samples were analyzed for benzene, toluene, ethylbenzere, xylenes (BTEX) total petroleum hydrocarbons as gasoline (TPHG). Samples were .sent to Applied Analytical Laboratories (DHS cert. Sample collectionwas _conducted- in-accordance2 with We terWork11) for ss 1 Quality `Assurance/Quality Control Plan (Appendix PPendix II, October 25, . 1990 Workplan). Laboratory data sheets and chain-of-custody documentation are contained in Attachment 1. - XFLR0812.VP n, a 1710 MAIN STREET . ESCALON,CA 95320 . (209)838-3507 2350-A WALSH AVENUE SANTA CLARA,CA 95051 . (408)496-1249 wy limit I 11111MIM11 Ill - � s x -