Laserfiche WebLink
• Monitoring Well Installation Work Plan - June 2000 <br /> LANGSTON'S MARKET <br /> 15615 South 7" Street, Lathrop, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr James Langston, Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> Work Plan for assessment of the Langston's Market property located at 15615 South 7`" Street, <br /> Lathrop,California(Figure 1) The purpose of the monitoring well installation is to assess the vertical <br /> and lateral extent of petroleum hydrocarbon-impact to soil and ground water encountered during the <br /> removal of underground storage tanks (USTs) and during the Preliminary Site Assessment This <br /> Work Plan provides the scope of work and procedures to be implemented to advance soil borings, <br /> soil and ground water sample collection and analysis, and monitoring well installation and soil <br /> boring abandonment <br /> This Work Plan has been prepared as required by the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and was prepared in accordance with the Regional <br /> Water Quality Control Board's Tri-Regional Board Staff Recommendations for Preliminary <br /> Evaluation and Investigation of Underground Tank Sites guidelines for the investigation of UST <br /> sites <br /> • <br /> 2.0. BACKGROUND <br /> The site is located at the corner of South 7" Street and L Street in the City of Lathrop, San Joaquin <br /> County, California The site is located in the northern half of Section 26, Township 1 South,Range <br /> 6 East, Lathrop Quadrangle, 7 5-Minute USGS Topographic Series, 1987, in an area of low <br /> topographic relief, at an elevation of approximately 18 feet above mean sea level The surrounding <br /> area is utilized for residential, industrial and agricultural purposes <br /> 21 UST REMOVAL <br /> Complete background information and details of the UST removal and previous investigation at the <br /> site is included in the report titled Interim Secondary Source Removal and Monitoring Well <br /> Replacement, dated 05 October 1995 and several Quarterly Reports, prepared by WHF, Inc Based <br /> upon information in these reports, it is AGE's understanding that in June 1990, following a helium <br /> pressure test, a 4,000 gallon gasoline UST failed and approximately 1,200 gallons of unleaded <br /> gasoline were released Approximately 4,500 tons of impacted soil were removed to depths of <br /> approximately 15 5 feet below surface grade (bsg) Between April 1992 and March 1998, eight soil <br /> borings were advanced to depths of 17 feet below surface grade (bsg) Six borings were advanced <br /> to depths between 34 and 36 5 feet bsg, four of which were completed as groundwater monitoring <br /> wells (MW-1 through MW-4) <br /> Advanced GeoEnvironmental,Inc <br />