Laserfiche WebLink
T <br /> A S S O C I A T E S I M C <br /> 1 2.5 Groundwater Sample Analysis <br /> 1 Argon Laboratories analyzed the groundwater sample collected from the site The samples from <br /> monitoring wells MW1 through MW3 were analyzed for TPHg, BTEX, and oxygenate fuel <br />' additives <br /> The water sample collected from the domestic well was analyzed for volatile organic compounds <br />' (VOCs) by a State-certified laboratory using EPA Method 524 2 <br /> The groundwater analytical results are summarized in Table 2, and laboratory data sheets are <br /> 1 presented in Appendix B <br /> 1 3.0 SUBSURFACE CONDITIONS <br /> 3_1 Geology <br /> 1 The site is situated at an approximate elevation of approximately 43 feet above mean sea level in <br /> PP PP Y <br /> the Great Valley geomorphic province The Great Valley province is a north-south elongated <br /> structural trough filled with sediment from marine and continental sources The continentally <br /> derived sedimentary deposits comprise the upper portion of the valley fill, and were deposited in <br /> 1 fluvial, alluvial, and lacustrine environments <br /> The site is situated on level terrain The soils at the property have been mapped by the United <br />' States Department of Agriculture (USDA), Soil Conservation Service as Archerdale Clay Loam <br /> This nearly level map unit is formed in alluvium derived from mixed rock sources A few areas <br /> have been noted to be to be dissected by intermittent sloughs which have since been filled as a <br />' result of land leveling The annual precipitation is about 14 inches (USDA, 1992) <br /> The soil borings advanced at the site to date, indicate the soil column consists of interbedded <br />' sand, silt, clay, and to a lesser degree, gravel to a depth of approximately 91 5 feet bgs, the <br /> maximum depth explored during this investigation <br />' Noteworthy observations include an apparent discontinuous gravel bed observed at <br /> approximately 20 feet bgs in borings SBI, MW1, MW2, and MW3 Also, a clay interval was <br /> observed at a depth of approximately 35 feet bgs in borings SBI, S132, MW1, and MW2 Soil <br /> samples indicate the thickness of each of these units is generally less than five feet <br /> Although sand was logged periodically in the upper 60 feet of the soil column, no sand units <br /> were observed beyond 65 feet bgs Soils beyond 60 feet bgs generally consisted of silt and clay <br /> variations <br />' w 1148851reports\Supp1 Invest doc 4 <br /> I <br />