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Nzr <br /> CLEARWA 'ER <br /> G .R O U P, I N C. r <br /> 1.0 'INTRODUCTION.. <br /> This report presents the. results of 'recent field activities performed by Clearwater <br /> : <br /> Group,_Inca (Clearwater) at the Cit of -Ripon Corporation Yard located in Ripon, <br /> _ <br /> California:,. The work was cY conducted to assess the_ conditions of soil and- <br /> . : groundwater beneath'the former location:of underground fuel storage,tanks. ; <br /> The work was performed in accordance with the project workplan approved by the <br /> San Joaquin .County. Public Health Services/Environmental Health Division <br /> (PHS/EHD), and included the following:_, <br /> • drilling and logging.three soil borings ' <br /> collecting soils samples for fuel constituent analyses ` <br /> • <br /> installing three`two-inch diameter monitorm � •wells in the boxings . <br /> • surveying monitoring wellhead elevations , <br /> • <br /> developing -the monitoring' wells <br /> . i <br /> collecting groundwater samples for fuel constituent analyses <br /> 1.1 Site Description and Background <br /> The project site is located. on the southerly outs ' is,of Ripon, :in-an agricultural and <br /> residential area. The Stanislau°s River meanders in a generally southwesterly <br /> direction just south of the site (Figure 1). Municipal water treatment ponds are <br /> located approximately. 1,000 feet south and east of the site. <br /> Two, 10,000 allon Minder round-.stora a .tanks' (UST's) were .removed on May 23; <br /> g g g. <br /> 1990. The site currently has at least ,one above -ground fuel .tank. The site layout <br /> including former UST locations is presented in figure 2. A review of available tank . <br /> removal documentation indicated- that the tanks were used.td store regular gasoline <br /> and diesel fuel. Soil samples collected from be eath the UST's during removal did <br /> • .P <br /> not contain total- petroleum hydrocarbons as gasoline (TPHg), kerosene, or motor . <br /> ' oil, benzene, toluene, ethylbenzene; and total ;xylenes '(BTEX) or tetra-ethyl lead <br /> above respective method detection limits.' On sample contained total petroleum <br /> P <br /> hydrocarbons'as diesel (TPHd).at'a concentration of 9,800..parts per million. , <br />