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� s <br /> Advanced <br /> GeoEnvironmental Inc . - - <br /> 03 September 1999 <br /> AGE-NC Project No. 97-0326 <br /> Ms. Carol Oz <br /> SAN JOAQUIN COUNTY PHS-EHD <br /> 304 East Weber Avenue. 3rd Floor <br /> Stockton, CA 95201 <br /> Subject: Work Plan Addendum - September 1999 <br /> K & S Gas & Grocery <br /> 701 East Charter Way, Stockton, California <br /> Dear Ms. Oz: <br /> At the request of Mr. Khaldoon Othman of K&S Gas & Grocery,Advanced GeoEnvirorvnental. Inc. <br /> (AGE) has prepared this Work Plan Addendum for additional assessment of hydrocarbon-impacted <br /> soil and ground water at and near 701 East Charter Way, Stockton, California. The scope of work <br /> includes the advancement of two soil probe borings and the installation of four additional ground <br /> water monitoring wells. <br /> BACKGROUND <br /> Three ground water monitoring wells are currently located at the site. Ground water occurred at a <br /> depth of approximately 30 to 31 feet during the June 1999 quarterly monitoring. Total petroleum <br /> hydrocarbons quantified as gasoline(TPH-g)was detected at concentrations as high as 330.000 parts <br /> per billion in water samples collected from the wells. The extent of impacted soil and ground water <br /> have not been defined at the site. Background information and site history is summarized in the <br /> .Vonitoring lVell Installation Report, dated 02 June 1999 and prepared by AGE. <br /> SCOPE OF WORK <br /> Initially, two soil probe borings (probings) will be advanced at the site. One probing will be <br /> advanced near MW3 and the second probing will be advanced through the conductor casing located <br /> west of the current underground storage tank(UST) location. Soil samples will be collected at 5-foot <br /> intervals beginning at a depth of 45 feet in the probing near MIA") and beginning at a depth of 20 feet <br /> in the probing advanced through the conductor casing. The probings will be advanced until two <br /> consecutive samples indicate the non-detection of hydrocarbons, based upon field readings. <br /> Procedures for sampling with the Geoprobe \\-ere described in the UST Pre-upgrade Assessment <br /> 1'Vork Plan, dated 30 April 1999 and prepared by AGE. <br /> A grab water sample will be collected from each probing at a depth of approximately 60 feet bsg, <br /> using a Geoprobe water sampling assembly, by advancing the ground water sampling assembly to <br /> 4005 North Wilson Way, Stockton,California 95205 <br /> Telephone(209)467-1006 FAX(209)467-1118 <br />