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' Monitoring Well Installation Report • RIPON FARM SERVICE 2 trth Highway 99,Ripon, California � ` Y4 O ' 1.0. INTRODUCTION At the request of Mr. Allan Fetters,Advanced Ge ironmental, Inc. (AGE) has prepared this report of environmental activities conducted at 2 11 South Highway 99, Ripon, California (the ' site).The location of the site and surrounding area are illustrated on Figure 1. Structures,monitoring wells and remediation well locations associated with the site are depicted on Figure 2. The report rdocuments the installation of four shallow ground water monitoring wells, well development and analytical results from ground water samples collected on 17 October 2005. ' The Central Valley Regional Water Quality Control Board(CVRWQCB)directed by letter dated 16 July 2004 that Ripon Farm Service (RFS) should characterize the quality of ground water, as well as ground water flow direction and gradient,at the RFS facility.The scope of work was to determine r if activities at the RFS facility have contributed to possible high nitrate concentrations in local ground water. The work was also performed in accordance with procedures approved in the AGE- prepared Monitoring Well Installation Work Plan, dated 30 August 2004 and approved by the ' CVRWQCB by letter dated 22 October 2004 • This report is prepared in accordance with CVRWQCB guidelines by a Professional Geologist as defined in Chapter 12.5 Article 4, Section 7850 of the Business and Professions Code. ' 2.0. BACKGROUND ' The site is located in a flat industrial/commercial area in northern Ripon, south of Jack Tone Road (Figure 1).The site is currently operated by Ripon Farm Service, a company that stores,batches and delivers fertilizers in bulk and diluted forms.The eastern portion of the site is dirt and gravel covered ' and consists of a wash-rack containment area with two concrete holding ponds and two storage buildings(Figure 2);the central portion is asphalt and concrete covered and consists of bulk fertilizer preparation in containment areas and storage buildings; the western portion is covered with ' compacted gravel and asphalt and consists of a storage building/office, truck scale and a former automotive shop. ' A petroleum-hydrocarbon release from former, leaking,underground' storage tanks (UST) .at the northwestern portion of the site is currently under assessment and remediation,utilizing five ground ' water monitoring wells and an assortment of remediation wells.Remediation by soil vapor extraction and air-sparging techniques have mitigated a significant portion of the dissolved hydrocarbon plume under the western portion of the RFS site. 1 Advanced GeoEnvironmental,Inc,