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San Joaquin County Boring Permit Application <br /> February 1, 2013 <br /> Page 2 <br /> be submitted to the laboratory for archiving and possible later analysis. <br /> A total of four soil borings will be completed in the southwest corner of the Property, within the area <br /> that may have been involved with the adjacent crude oil release site, based on a 1957 aerial <br /> photograph. The borings will be advanced to approximately 10 feet below the depth of the ground <br /> surface on the adjacent crude oil release site, to target the depth at which "subsurface asphaltic <br /> material' was found in soil in test trenches TT-106 and TT-107 in 2009. It is expected that the soil <br /> borings will be advanced to approximately 25 feet in depth. Soil will be continuously cored and <br /> examined in the field for evidence of asphaltic material. One soil sample will be collected near the <br /> base of each boring for analysis of TPH and semi-volatile organic compounds. If asphaltic material <br /> is encountered, then the soil sample will be collected beneath the asphaltic layer in an effort to <br /> define the depth of soil impact. Since one grab-groundwater boring is located in this area, a soil <br /> sample will be collected from that boring, and an additional three soil borings will be completed in <br /> this area to form the four soil boring locations. <br /> Soil and groundwater samples will be hand delivered to CLS Laboratories in Rancho Cordova under <br /> Chain of Custody protocols for analysis. The four soil samples will be analyzed for TPH in the diesel <br /> fuel and motor oil ranges (TPHd,o) using EPA Method 8015M with a silica gel pre-treatment step; <br /> and for semi-volatile organic compounds using EPA Method 8270. The three groundwater samples <br /> will be analyzed for TPHd,o using EPA Method 8015M with silica gel pretreatment, and volatile <br /> organic compounds and naphthalene using EPA Method 8260B. <br /> Work will be performed under a site-specific Health and Safety Plan. Underground Service Alert will <br /> be notified at least 2 days prior to drilling to identify utilities entering the Property. Additionally,Tetra <br /> Tech will hire a private utility clearance contractor to clear the proposed boring locations prior to <br /> drilling. <br /> Please contact Tim Costello at (916) 853-4584 (direct) or by email at tim.costello@tetratech.com <br /> with any questions regarding the site investigation. <br /> Sincerely, <br /> Tetra Tech, I C. <br /> Tim Costello <br /> Senior Scientist, Associate <br /> Cc: Figures 1 and 2 <br /> TETRA TECH <br />