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r <br /> HORIZON ENVIRONMENTAL INC. <br /> �...r Specialists in Site Assessment Remedial Testing Design and Operation <br /> June 28, 1996 <br /> JUL 81996 <br /> Mr Kenneth Earnest <br /> Ultramar, Inc DMRONMEWAL HEALTH <br /> 525 W Third Street PERMIT/SERVICES <br /> Hanford, CA 93230 <br /> Subject QUARTERLY GROUNDWATER MONITORING REPORT <br /> Second Quarter 1996 <br /> Former Beacon Station No 494 <br /> 2185 East Fremont Street, Stockton, California <br /> Mr Earnest <br /> Horizon Environmental Inc (Horizon) has prepared this Quarterly Groundwater Monitoring <br /> Report which presents the results of the 1996 second quarter sampling for the above- <br /> referenced site (Figure 1) There are currently five groundwater monitoring wells, MW-1 <br /> through MW-5, at the site (Figure 2) In addition to quarterly groundwater monitoring and <br /> sampling, Horizon had been performing sampling and operation and maintenance of a <br /> groundwater extraction system at the site prior to discontinuing operation of the system on <br /> September 7, 1995 Groundwater was discharged to the City of Stockton sanitary sewer <br /> system under a Municipal Utilities Department Regional Wastewater Control permit dated <br /> August 21, 1993 Prior to discontinuing operation of the groundwater treatment system a <br /> total of approximately 313,101 gallons of groundwater had been pumped and discharged A <br /> soil-vapor extraction system was operating under San Joaquin Unified Air Pollution Control <br /> District Permit to Operate No N-116-2-0 but was shut down in July 1995 <br /> Current Work <br /> Depth-to-groundwater measurements were obtained from wells MW-1 through MW-5 by <br /> Horizon on April 30 and May 30, 1996 Static groundwater levels were measured from the <br /> top of casing (TOC) of each well and recorded to the nearest 0 01 foot The water level <br /> measurements were subtracted from reference elevations previously reported by other <br /> consultants to obtain mean-sea-level (MSL) elevations as listed in Table 1 Horizon field <br /> methods and procedures are included as Attachment A Horizon field data sheets are <br /> included as Attachment B Historical water-level data reported by previous consultants are <br /> included as Attachment C <br /> 5011 Goden Foothill Parkway Suite 7 - EI Dorado Hills CA 95762 - (916)939-2170 - FAX(916)939-2172 <br /> P 0 Box 5283 9 Bakersfield CA 93,388 - (805)589-8389 - FAX (805) 589-1456 <br />