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HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> 0 <br /> September 29, 2000 ENVIRONMENTAL HEALTH DIVISION c- <br /> p 304 E.Weber Ave.Third Floor ``-3 <br /> P. O. Box 388, Stockton CA 95201-0388 <br /> Mr. Michael J. Infurna, R.E.H.S. Approved 0' <br /> Environmental Health Division Denied x� <br /> San Joaquin County Public Health Services Conditions <br /> P. O. Box 2009 Date 10—Z/-06) by <br /> Stockton, California 95201 <br /> Subject: Changes in Quarterly Monitoring Analytical Programs <br /> San Joaquin County, California <br /> Mr. Infarna: <br /> At the request of Ultramar Inc. (Ultramar), Horizon Environmental Inc. (Horizon) proposes <br /> to amend the quarterly groundwater monitoring analytical programs for three Ultramar sites <br /> in Stockton. This letter is documentation confirming our telephone conversation on this day <br /> in which it was agreed that a decrease in the frequency of certain quarterly monitoring <br /> analyses was warranted and acceptable. The three sites in Stockton referred to above are: <br /> Beacon Station#419; 2350 Waterloo Road; <br /> Beacon Station#474; 3440 East Main Street; and <br /> Beacon Station#641; 1210 East Hammer Lane. <br /> Currently, analyses typically performed for quarterly monitoring at these sites include: total <br /> petroleum hydrocarbons hydrocarbons as gasoline (TPHg); the volatile aromatic compounds <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX); the seven fuel oxygenates methyl <br /> tert-butyl ether (MTBE), diisopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl <br /> methyl ether (TAME), tert-butanol (TBA), methanol and ethanol, and the lead scavenger <br /> compounds 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (1,2-DBA) by EPA <br /> Method 8260B. It is proposed to decrease the frequency to an annual basis for the <br /> oxygenates (except for MTBE), and the lead scavenger compounds 1,2-DCA and 1,2-DBA. <br /> Analytical results of previous quarterly monitoring events have confirmed the presence or <br /> absence of these analytes at the three Stockton Ultramar sites. Annual inclusion of the <br /> analytes in the second calendar quarter (spring) when groundwater is typically at the highest <br /> yearly level should be adequate to monitor the conditions relative to the analytes. It is <br /> understood that the reduced frequency for the six oxygenates and lead scavenger compounds <br /> is applicable during the interim period of site investigation and portions of remedial action <br /> periods. However, the frequency may be changed to reflect site requirements depending on <br /> the investigative or remedial status of the site. New installations shall not necessarily be <br /> subject to reduced analytical programs initially in order to establish baseline concentrations <br /> in those particular areas. <br /> 5011 Golden Foothill Parkway, Suite 7 • EI Dorado Hills, CA 95762 • (916) 939-2170 • FAX (916) 939-2172 <br /> P.O. Box 5283 • Bakersfield, CA 93388 9 (661) 589-8389 9 FAX (661) 589-1456 <br />