Laserfiche WebLink
- - - - - --- - ---,ter <br /> ' 11 June 1999 <br /> • AGE-NC Protect No 97-0333 <br /> ' Page 3 of 9 <br /> 2 4 GROUND WATER DEPTH AND GRADIENT <br /> tThe estimated depth to ground water at the site is between IS and 20 feet below surface grade (bsg) <br /> ' based on information from Lines of Equal Depth of Water Wells Spring 1996, published by the San <br /> Joaquin County Flood Control District and Water Conservation District(SJCFCD) Based on review <br /> of a regional ground water elevation map published by the SJCFCD, the prevailing ground water <br /> flow direction in Manteca is generally toward the northwest, although flow directions may be both <br /> locally and seasonably variable <br /> ' 3.0. PROCEDURES <br /> ' On 15 April 1999, six soil probe borings (P-1 through P-6) were advanced on-site as part of site <br /> assessment activities related to the three former USTs Soil probe boring P-4 was advanced vertically ; <br /> to a depth of 40 feet bsg, P-1 and P-5 were advanced to 30 feet bsg, P-2 and P-3 were advanced to <br /> ' 25 feet bsg and P-6 was advanced to 15 feet bsg (See Figure 2) <br /> '. 3 1 DRILLING ACTIVITIES <br /> ' Soil probe borings P-1 through P-6 were advanced utilizing a van-mounted Geoprobe 5400 equipped <br /> with i 125-inch diameter probe rods with an attached 2 15-inch diameter soil sampler, using "direct <br /> push' technology <br /> 3 1 1 Soil Sample Collection <br /> ' Discrete soil samples were collected ollected at 5-foot inter als beginning at 5 foot bsg, to total depth of each ' <br /> boring Soil samples were collected using a Geoprobe soil sampling assembly loaded with four pre- <br /> cleaned 1 125-inch by 6-inch grass sleeves Soil samples were preserved by covering both ends of <br /> the brass sleetie with Teflon sheets, capping, and sealing with tape Each sample sleeve -,vas labeled <br /> 'A ith soil probe boring location depth time, date and sampler's initials <br /> Each presen ed sample v,as 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 cinder chain <br /> of custody selected samples %sere analyzed in accordance xNah <br /> ' l-PA Method 5030/8015M for total petroleum h}drocarbons quantified as gasoline 9nd dirsL, <br /> '7FIi g and TPli-d, iespLcfrn'cly) <br /> 1 <br /> ad+ancedGeuEn�irunmfnt,ti €<< i <br />