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- CLEARWATER: <br /> G R O 'U',-P, . I N C.. <br /> X.O 'INTRODUCTION. <br /> This . report presents the results second ua�ter 1995 �'oundwater .-monitoring <br /> _performed'by. Clearwater Group; Inc. (Clearwater) on May. 25, 1995 at 1210 Vera <br /> Avenue in. Ripon, California (Figure 1). _The tasks performed during this phase 'of <br /> work, included' groundwater gauging, .wellpurging and groundwater sample <br /> ' collection. <br /> 2.0' BACKGROUND <br /> The project site is located on'the southerly outskirts of Ripon in an agricultural'and <br /> residential area. . The Stanislaus River. meanders in a -southwesterly direction <br /> a.. . approximately. 4000 feet south- of the site (Figure .1). , Municipal-,water,treatment <br /> ponds are located approximately 1,000 feet south and.east of the`si'te. <br /> Two 10,000. allon underground storage tanks (UST's) were removed from the <br /> g g g I <br /> subject location on May 23,'1990. -The site.currently has at least one above ground <br /> fuel tank. The site layout, including former,USi locations, is presented in.'_Figure 2. <br /> A review of available tank removal documents,indicated that the tanks were used <br /> to.store regular gasoline and diesel fuel. Soil samples collected from beneath 'the <br /> UST's during removal 'did not contain' total petroleum hydrocarbons- as gasoline <br /> , m it l ethyl <br /> benzene,kerosene, or, motor oil, #o uene, ethy benzene, .and total xylenes , <br /> (BTEX) or tetraethyl lead above respective rnethod detection limits. One sample <br /> contained total petroleum hydrocarbons;as diesel.(TPHd)):at a concentration of 9,800 <br /> parts per million (Ppm) <br /> Three 2-inch7diameter .monitoring wells, were"'installed ,by Clearwater on February <br /> 23, 1995. No.petroleum hydrocarbons we're detected in soil samples collected 'during <br /> soil-borehole drilling, however,' all three groundwater samples,collected from -the <br /> .. monitoring wells on February 28, 1995 contained •TPHd in concentrations up to 330 <br /> parts per billion:(ppb). <br /> t.. <br /> 3.0 FIELD ACTIVITIES ' <br /> Clearwater began quarterly' groundwater sampling at�the,subject location iri February j <br /> 1995.; All,work has been performed in .accordance with Clearwater Field Procedures <br /> (previously submitted) and under the"directives and guidelines' established by San <br /> Joaquin County Public Health Services/. : Environmental- Health Division <br /> (PHS/EHD) and the Regional Water Quality Control Board.' <br /> D-1'04 2.Q95 1` . July 14;1995 <br /> Fr. <br /> r <br />