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. Monitoring Well Installation Work Plan <br /> COMFORT AIR <br /> 1607 Turnpike Road, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr Greg Gaut of Comfort Air, Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared this Monitoring Well Installation Work Plan for 1607 Turnpike Road, Stockton, California <br /> The purpose of the investigation is to evaluate the vertical and lateral extent of petroleum <br /> hydrocarbon impacted soil and ground water as a result of the former operation of underground <br /> storage tanks (USTs) at the site <br /> This work plan describes the scope of work and procedures to be implemented for the drilling and <br /> installation of three monitoring wells, collection and analysis of soil and groundwater samples and <br /> performance of a sensitive receptor survey The location of the site is illustrated in Figure 1 A plan <br /> of the site, including existing wells, is illustrated on Figure 2 <br /> This work plan has been prepared as required by the San Joaquin County Public Health Services - <br /> Environrriental Health Division (PHS-EHD) This work plan is prepared in accordance with the <br /> Regional Water Quality Control Board's Tri-Regional Board Staff Recommendations for <br /> Preliminary Evaluation and Investigation of Underground Tank Sites <br /> 2.0. BACKGROUND <br /> The Comfort Air facility is a heating and air conditioning sales and repair business located at 1607 <br /> Turnpike Road, Stockton, California, in an area of low topographic relief in southwestern Stockton <br /> The site is located in section 10, Township I north, Range 6 east, Mount Diablo Base and Meridian <br /> The surrounding area is utilized for residential and light industrial purposes The Port of Stockton <br /> lies approximately two miles northwest of the site <br /> 21 UNDERGROUND STORAGE TANK REMOVAL <br /> One 550-gallon gasoline underground storage tank (UST) was removed from the site in January <br /> 1989 Following the tank removal, soil samples were collected beneath the UST and submitted to <br /> a laboratory for analysis for petroleum hydrocarbons Total petroleum hydrocarbons as gasoline <br /> (TPH-g) was reported in soil samples at concentrations as high as 5,800 mg/kg (milligrams per <br /> kilogram or parts per million ppm) <br /> 23 GROUND WATER MONITORING WELL INSTALLATION <br />• In February 1992, three groundwater monitoring wells were installed near the former UST area by <br />