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{ <br /> ENGINEERING INC. <br /> p <br /> RCE#27011 Lic. #537901 ¢ <br /> 1 5, 1997 <br /> November i- ;' `;)'j �'- <br /> Mr. Srikanth Dasappa <br /> USA Gasoline Corporation <br /> 30101 Agoura Court, Suite 200 <br /> Agoura Hills, California 91301 <br /> SUBJECT: SOIL EXCAVATION AND PRODUCT LINE SAMPLING <br /> USA STATION#65 <br /> 2600 WEST LODI AVENUE <br /> " LODI, CALIFORNIA <br /> Dear Mr. Dasappa: <br /> This letter contains the soil sampling analytical results associated with the October, 1997 <br /> underground storage tank (UST) replacement and over-excavation activities at the subject site, as <br /> shown on'�Figures I and 2. <br /> u r <br /> The work-was performed in accordance with the "Soil Excavation and Product Line Sampling <br /> Workplan", which was approved by the San Joaquin County Public Health Services (County) <br /> prior to commencing work at the site. <br /> f <br /> Sampling Activities <br /> The excavation consisted of the removal of three USTs and associated product lines on October <br /> t 6, 1997. A GHH representative collected soil samples from the product line trenches and the area <br /> exposed during the UST removals. Soil samples from the product lines were collected at <br /> approximately 2-feet below dispenser plumbing and 3-feet below ground surface (bgs) at <br /> �. locations shown on Figure 3. The samples were collected at locations requested by Mr. Eric f <br /> Trevena with the County. A total of 10 soil samples were collected during product line sampling <br /> (P-1 through P-10). <br /> At the request of the County and based upon field data collected during the UST and product line <br /> } removal, additional excavating of soil in the UST area was conducted by USA. Field soil ; <br /> screening,was performed using a hand held Photo-Ionization Detector (PID), calibrated to 100 <br /> ' parts per million (ppm) Iso-Butylene. <br /> Over-excavation of impacted soil surrounding the USTs was completed on October 7, 1997. A <br /> total of 14 samples were collected at the base of the excavation (EXC-1 through EXC-14). <br /> { Samples were collected as directed by Mr. Harlan Knoll with the County. The excavation was f <br /> completed to 16-feet bgs, except for an area in the northeast corner where excavating continued F <br /> r to 20-feetbgs. Excavation soil sample locations and depths are shown on Figure 4. <br /> F The samples were collected in 6-inch long, 2-inch diameter brass tubes from undisturbed soil in <br /> the excavator bucket. <br /> 8084 Old Auburn Road, Suite E, Citrus Heights, CA 95610 (916)723-7645 (800)877-1739 fax(916)723-7698 <br /> t <br />