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Wright <br /> Environmental <br /> Services, Inc. <br /> April G, 1995 <br /> San Joaquin County <br /> Public Health Service-Environmental Health Division , <br /> 445 N San Joaquin Street �c> L, <br /> Stockton, CA 95201 <br /> Attn Ms Linda Turkatte <br /> .NUPE Ml�RMibNTAL_ <br /> �l f1ERL�t-1 <br /> Re Waterloo School, 7007 N Pezzi Rd , Stockton, CA 1C�a <br /> Groundwater Investigation <br /> Dear Linda, <br /> Wright Environmental Services, Inc (Wright) is pleased to submit this workplan <br /> for groundwater investigation work as requested at the above referenced site <br /> Wright maintains all the required licenses and insurance to perform the work as <br /> presented <br /> This groundwater investigation, which consists of the construction of o n e <br /> groundwater monitoring well and the collection of new data at the site is in response <br /> to a corrective action directive issued to Linden School District (district) by San <br /> Joaquin County Public Health Service-Environmental Health Division (PHS-EHD) <br /> SITF HISTORY <br /> The Waterloo School site had one underground storage tank located on the North side <br /> of a maintenance building The site is currently used by the district as an <br /> elementary school The site had a 550 gallon, underground storage tank that <br /> contained gasoline The tank was removed on November 21, 1989 One soil sample <br /> was collected beneath the tank Chemical analytical data indicate that contamination <br /> exists in the soil below the former gasoline tank, showing concentrations of 3025 5 <br /> parts per million (ppm) Total Petroleum Hydrocarbons as Gasoline (TPHG) Benzene, <br /> Toluene, Ethylbenzene and Xylenes (13TEX) concentrations were 59 03, 322 64, 100 42, <br /> and 520 54 ppm respectively Total lead found beneath the tank was 17 S ppm <br /> Ethylene dibromide was not detected Since contamination was observed to exceed 100 <br /> ppm, a groundwater monitoring well is required by State guidance documents In <br /> order to achieve closure of the site the extent of contamination in soil and <br /> groundwater will need to be defined In an effort to define the lateral and vertical <br /> e\tent of contamination at the site, a subsurface investigation was performed on <br /> September 13, 1990 There were 4 soil borings installed at this time One boring was <br /> advanced to 82 5 feet the other 3 borings were terminated at 30 5 feet Analytical data <br /> from this investigation reveals low levels of gasoline constituents There has been <br /> no further investigation or remediation at the site to date <br /> 'Technical Approach <br /> Based on a review of available information, it is our recommendation that one <br /> monitoring well be constructed, with the monitoring well being within 10 feet (or as <br /> close a safely practicable) of the former tank location on the surmised down gradient <br /> side Soil and groundwater samples will be analyzed for 'total Petroleum <br /> Hydrocarbons as Gasoline (TPHG), Ben/_ene, Toluene, Ethylbenzene and Xylenes <br /> 4220 Commercial Dr #5 • Tracy, California 95376 �Is� <br /> Telephone (209) 833-0758 • Fax (209) 832-5152 l <br />