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Closure Sum' m ary Report -.Former UST No. American Moulding and Millwork-Company 2801 North West_Lanei'Stocton, California PHS-EHD"Site Code 18822 ` 1.0. INTRODUCTION In accordance with.the request of Mr.Bernie Sloop of American Moulding and Millwork,Company (AMM)Advanced GeoEnvirom-rental,Inc. (AGE)has epared this closure summary report for-the former underground storage tank"(UST) No. 1` "facility at-2$0 1.-North" West .Lane, Stockton, California; 'site code. 18822. The. site has previously .been'assessed and remediated; recent confirmation,sampling.has been completed'as per the work plan approved by the County of-San r Joaquin•"Public Health Services - Environmental Health Division (PHS-EHD). ' 1.1. SITE LOCATION The site is located on a 64-acre property on the southwest corner of the.intersection'of North West Lane and East Alpine Avenue (Figure i): The former WST area is approximately 30 feet east of a Targe water:tower located on the southernmost portion:�fthe property (Figure 2). The site has low" - -topographic relief, sloping gently toward the west"to so�thwest,at an elevation between 15 and 20 ; feet above sea level. The property is situated-within the Great Valley Geomorphic Province of California, a large,elongate northwest tending, asymmetric structural trough. The" reat.Valley Province has been filled to its . present clevation'with"thick sequences of sediment ranging in age from Jurassic.to Recent, creating- a nearly flat lying alluvial plain extending from the Teha�hapi Mountains in the south to the Klamath ." Mountains in the north. The western and eastern boundaries of this province are comprised of the California 'Coast Range and the -Sierra Nevada, respectively. "Rocks -composing, the basement r complex of the province have not been completely defiled but are believed to be of metamorphic k and igneous-origin.,"The Great Valley Province is subdivided into two major divisions designated the Sacramento and San.Joaquin Valleys. The Modesto,-Riverbank and Turlock Lake Formatio s"and overlying Recent alluvium are the principal source of domestic ground water.in the-1 3,50 square-mile San Joaquin Valley Ground Water Basin (Basin 5-22). Ground water is being monitored by Dames&"Moore"at adjacent-UST site, with two-monitoring " wells-within 1,00 feet of the former UST No."l.�Ground water occurred at approximately 35"feet below surface grade in March 1999,.and was flowing to and the northeast (Dames & Moore, April 1999, Quarter"'ly"Groundwater.Monitoring Report-Marc,41999). The Dames&Moore report shows " r the historic localground water flow direction varying-ft9rn west-northwest (297') to east-southeast (103 0). Advanced GeoEnvironmenta1,Inc.