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s <br /> t <br /> 12 October 1999 <br /> AGE-NC Project No 98-0497 <br /> Page 3 of 7 <br /> ' map Lines ofEgual Elevation of Groundwater, Fall 1997(FCD&WCD) depicts the regional ground <br /> water flow direction as being towards the northeast <br /> ' Review of historical depth to ground water maps (FCD&WCD) dating back to 1971 suggests that <br /> ground water depth near the site has fluctuated between 60 and 100 feet bsg <br /> 3.0. PROCEDURES <br /> ' On 29 September 1999, two soil probe borings (P-I and P-2)were advanced at the site as part of site <br /> assessment activities related to the two former USTs The field work was conducted as outlined in <br /> ' the PHS-EHD approved work plan dated 05 August 1999 <br /> 3 1 DRILLING ACTIVITIES <br /> Soil probe borings P-1 and P-2 were advanced utilizing a van-mounted Geoprobe 5400 equipped <br /> '• with 1 125-inch diameter probe rods with an attached 2 15-inch diameter soil sampler, using "direct <br /> push"technology Soil probe baring P-1 was advanced vertically to a depth of 65 feet bsg, soil probe <br /> boring P-2 was advanced to 30 feet bsg (See Figure 2) <br /> 1 <br /> ' 3 1 1 Soil Sample Collection <br /> Discrete soil samples were collected at 5-foot intervals, beginning at 15 foot bsg from P-1 and <br /> beginning at 5 foot bsg from P-2, to total depth of each boring Soil samples were collected using <br /> a Geoprobe soil sampling assembly loaded with four pre-cleaned l 125-inch by 6-inch brass sleeves <br /> Soil samples were preserved by covering both ends of the brass sleeve with Teflon sheets, capping, <br /> ' and sealing with tape Each sample sleeve was labeled with soil probe boring location, depth, time, <br /> date and sampler's initials <br />' Each preserved sample was logged on a chain-of-custody form, placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory under chain <br /> of custody, selected samples were analyzed for <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) and TPH-d by EPA Method <br />' 5030/8015M, <br /> • - Benzene, toluene, ethylbenzene and xylene (BTEX) compounds and methyl tertiary butyl <br /> ether (MTBE) by EPA Method 8020, and <br /> 1 <br /> Ad►anced GeoEm tronmentid,Inc <br />