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aaF0, <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA M.D.M.P H. <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 c4c+FpR��P <br /> (209) 468-3400 <br /> CC s <br /> JONATHAN MARLOWE <br /> MARLOWE PROPERTIES <br /> P O BOX 150-211 <br /> SAN RAFAEL CA 95915 MAR19�' <br /> RE Marlowe Property SITE CODE: 1828 <br /> 4648 Waterloo Road <br /> Stockton, CA 95215 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has completed the review of the "Monitoring Well Installation Report" dated December <br /> 1992 and prepared by Geological Audit. PHS/EHD has the following comments for your <br /> consideration. <br /> One monitoring well, MW2, was installed on December 22, 1992 and was located <br /> between the former tank pit and the on site domestic well which is currently in use. The <br /> total depth of the well was 109 feet. Soil samples were collected at 40, 65, 90, and 95 <br /> feet. No total petroleum hydrocarbon (TPH) contamination was detected during <br /> laboratory analysis; however, field screening of the sample collected at 90 feet did detect <br /> 13 ppm of organic vapors. <br /> Groundwater samples were collected from MW2 on January 8, 1993 and analysis <br /> detected contamination, benzene 1.0 ppb, TPH-gasoline 83 ppb (not typical gasoline). <br /> Subsequent analysis utilizing EPA Method 601 detected halogenated volatile organic <br /> carbons (HVOC) which exceed the State of California Maximum Contaminant Level <br /> (MCL) 1,1-dichloroethene 120 ppb and trichloroethene 36 ppb. The report indicated <br /> that all of the TPH-gasoline that was detected utilizing EPA Method 8015 could be <br /> accounted for as HVOC. Please provide documentation from the laboratory concurring <br /> with this finding. <br /> PHS/EHD concurs with the recommendation to resample the well to confirm <br /> groundwater contamination. The on site domestic well was last sampled December 26, <br /> 1991 and therefore, should also be resampled and analyzed utilizing EPA Methods 8015, <br /> 8020 and 601. Please schedule the next sampling event by April 8, 1993 with the <br /> resultant quarterly report due May 19, 1993. <br /> A Division of-San Joaquin County Health Carr Services �.j <br />