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EA <br /> ?`Fj v : rking To Restore Nature <br /> 93 SEP 2'1 pry �; <br /> 1710 Main Street E 3 <br /> Escalon, CA 95320 <br /> Phone: (209) 838-3507 <br /> FAX: (209) 838-3509 <br /> September 20, 1993 <br /> Ms. Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> -Stockton, CA. 9.5201 <br /> RE: Subsurface Investigation, 30 Munford Avenue, Stockton, California, Site Code: 1694 <br /> Dear Ms. Turkatte: <br /> RESNA Industries, Inc: (RESNA), on behalf of Hendrix and;Sons Trucking, is submitting this <br /> correspondence in response to a written request by San Joaquin County Public Health Services, <br /> Environmental. Health Division (PHS/EHD), for additional subsurface investigation at the above <br /> referenced site (PHS/EHD correspondence dated 08/04/93). <br /> Initial groundwater data collected from well MW 1 in 1988 indicated that groundwater beneath <br /> the site had been impacted by a hydrocarbon release (Table 1). However, the analytical results <br /> are somewhat nebulous. The detected level of benzene in water samples appear to be <br /> inordinately high in relation to the total hydrocarbon.result, particularly in the May 1988 sample <br /> (350 ppb benzene, but only 0.650 total hydrocarbons). The last water sample collected from <br /> MW 1 before groundwater dropped below the well intake (June 1991) indicated benzene was <br /> present at levels below the detection limit of 0.5 ppb. Samples collected from newly installed <br /> wells MW2, MW3, and MW4 in May 1993 detected no gasoline coristituents indicated that <br /> groundwater has not been significantly impacted beneath the site. <br /> Groundwater beneath the site currently occurs at a depth of approximately 74.2 to 74.9 feet <br /> below ground surface. Monitoring well MW 1 is currently devoid of water. However, the total <br /> depth of well MW 1 is approximately 74.6 feet below ground surface, indicating that the water <br /> table is within one to two feet of the bottom of well MWL <br /> To c6nfirm groundwater conditions beneath .the site Hendrix and Sons Trucking proposes to <br /> mo%nitor groundwater levels on a monthly basis throughout the winter season in, anticipation of <br /> L-091793.DRF <br />