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8.0 IDENTIFIED CONTAMINATION SOURCES <br />The following sources of past, current, on-site, and off-site contamination have <br />been identified as a result of this investigation: <br />1 <br />N <br />3 <br />Identified Contamination Source Evaluation <br />The house, shop, and storage <br />building on the southern part of the <br />Site date to the 1950s. The shop <br />on the northern part of the Site <br />dates to the 1980s. (Current and <br />past on-site) <br />A domestic well and two septic <br />systems are located on the Site. <br />An older well was reportedly <br />destroyed when the current well <br />was constructed in the 1950s or <br />60s. (Current and past on-site) <br />According to the records on file, <br />four underground storage tanks <br />were originally present on the Site: <br />a 4,000 -gallon diesel tank, a two- <br />compartment (768 and 278 gallons) <br />gasoline tank, a 278 -gallon <br />gasoline tank, and a 375 -gallon <br />gasoline tank. The 4,000 -gallon <br />tank was removed in 2000, and <br />three tanks were removed in 2003. <br />There is some ambiguity about the <br />total number of tanks originally <br />present and removed from the Site, <br />possibly due to the two- <br />compartment tank; however, Mr. <br />Marsili indicated that all former <br />underground storage tanks have <br />been removed from the Site. (Past <br />on-site) <br />For any current or former structure <br />dating from the 1980s or earlier, the <br />assumption is made that lead - <br />containing materials and/or <br />pesticide residues may be present <br />in and around the structure. <br />Underground infrastructure may <br />exist in the vicinity of the former <br />structures. The typical standard of <br />care for SSCRs does not require <br />any further investigation of current <br />or former structures. <br />The domestic well and two septic <br />systems are currently in use. No <br />records were identified related to a <br />former well. <br />Underground fuel tanks can leak, <br />leading to soil and ground -water <br />contamination. The San Joaquin <br />County Environmental Health <br />Department issued a "no further <br />action" letter for the three tanks <br />removed in 2003. Although no <br />contamination was identified after <br />removal of the 4,000 -gallon tank, <br />the removal was done without a <br />permit, and it does not appear that <br />the San Joaquin County <br />Environmental Health Department <br />has closed this case. <br />LOGE 2149 8 <br />