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5.0 GROUNDWATER GRADIENT AND FLOW DIRECTION Groundwater depths were measured in each well, prior to purging and sampling on April 3, 2000 Depths were measured relative to the north side of the top of each well casing The monitoring well top-of-casing (TOC) elevations were surveyed relative to an arbitrary benchmark(chiseled square set at southeast corner of residence, assumed elevation of 100 00 feet) on February 19, 1999 by Quartaroh &Associates In each well, groundwater depth was subtracted from the respective well casing elevation to establish a groundwater elevation Cumulative groundwater elevation and gradient data is summarized in Table 3 On the basis of the April 2000 groundwater measurements, groundwater flows to the east- southeast with a surface gradient of 0 02 Figure 3 presents a Generalized Potentaometric Surface Map for the April 2000 groundwater monitoring event 6.0 GROUNDWATER MONITORING WELL SAMPLING BSKerformed well sampling p pang activities on April 3, 2000 Prior to purging of the wells for sampling, water from each well was observed for floating product Floating product was not observed in the four monitoring wells The monitoring wells were purged of at least four well- casing volumes The temperature, conductivity, and pH were measured and recorded after each approximate well volume After purging, each monitoring well was allowed to recover, then water samples were collected from each well using a clean disposable bailer The samples were labeled, placed in an ice chest cooled with crushed ace, and submitted to a State-certified analytical laboratory for chemical analysis of TPHg and BTEX by EPA Method 8015/8020 (Modified), and fuel oxygenates and 1,2-DCA by EPA Method 8260 Equipment used during purging and sampling activities was cleaned with non-phosphate detergent wash and rinsed prior to use at each well location The purged groundwater was stored an appropriately labeled 55-gallon drums at the Site Water Sampling Logs are included.in Appendix A ' 7.0 ANALYTICAL RESULTS A summary of analytical results for the first quarter of 2000 are presented an the following Table A A cumulative summary of quarterly monitoring analytical results is presented an Table 2 Laboratory Data Reports and Cham-of-Custody documentation are included in Appendix B S=u;Report 07400178-Fiat Quarter 20M 3