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Ce.r. RESNA WATERWORK CORP. <br /> <br />INDUSTRIES <br /> <br />AUG 13 1991 <br />ENVIRONMENTAL HEALTH <br />PERMIT/SERVICES <br />August 9, 1991 <br />Ms. Eleanor Ratliff <br />San Joaquin County Public Health Services <br />Environmental Health Division <br />Post Office Box 2009 <br />Stockton, CA 95202 <br />Re: Gardner Property, 26056 Thornton Road, <br />Thornton, CA Site Code 1864 <br />Dear Ms. Ratliff: <br />As we discussed in a telephone conversation on July 30, 1991, I am <br />writing to clarify the proposed locations of the three additional <br />wells to be installed at the above referenced site. The <br />additional wells are being required by the San Joaquin County <br />Public Health Services, Environmental Health Division (SJCPHS) to <br />further assess the impact of petroleum hydrocarbons on groundwater <br />beneath the site. <br />Monitoring data indicates groundwater beneath the site currently <br />flows west-southwest under an extremely flat gradient of <br />approximately 4.6 ft./mile or 0.0009 ft./ft. (Figure 1). <br />Laboratory results indicate that very low levels of gasoline <br />hydrocarbons were detected in downgradient well MW2. The SJCPHS is <br />requesting further definition of the dissolved hydrocarbon plume. <br />Additional wells are necessary to define the lateral extent of the <br />plume. Ideally, one well would be placed downgradient of MW2 <br />directly downgradient of the source (the former underground storage <br />tanks). As shown on Figure 1, the ideal location of the <br />downgradient well for the current groundwater flow direction would <br />be across Thornton Avenue on privately-owned property. The <br />proposed downgradient well will necessarily be placed within the <br />groundwater flowpath (Figure 2). This well location should be <br />adequate to detect any contaminants in the groundwater if the <br />contaminant plume has indeed migrated that distance downgradient. <br />Because of the flat gradient, this well location should be adequate <br />even if groundwater direction shifts slightly. <br />In order to avoid inadequate well locations and, consequently, <br />undue costs to Ms. Gardner, RESNA Industries/WaterWork Corp. <br />(WaterWork) requests SJCPHS concurrence on the proposed well <br />locations as shown on Figure 2. We are currently negotiating with <br />GPL0809.WP <br />1710 MAIN STREET • ESCALON, CA 95320 • (209) 838-3507 <br />2350-A WALSH AVENUE • SANTA CLARA, CA 95051 • (408) 496-1249