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Neighborhood E Wicklund Village — <br /> MOUNTAIN HOUSE <br /> (Neighborhood F) <br /> MASCOT-BL <br /> >1 SITE <br /> J Neighbofiood D TRACY; <br /> >. Neighborhood C <br /> �I <br /> Lu <br /> m Legend <br /> Z ? Prolmscd Soil <br /> Z p D Rcnlo al <br /> UO r Z � i � site <br /> ®Encapsulation <br /> a <br /> 0 ¢, /� ;arca <br /> W O ;', 0 500 1.000 <br /> Q —Z GRANT LINERD <br /> Feet <br /> I [Wa 11 11:= „ 11 LOF' <br /> Site Location and Description drin was found at concentrations above safe <br /> The property is a 61-acre agricultural parcel lo- screening levels in the upper six inches of soil in <br /> cated immediately east of the Alameda-San certain areas of the property. A total of 64 soil <br /> Joaquin County line and north of Grant Line samples were collected from the site at various <br /> Road, about five miles northeast of Tracy, in the depths, and 28 samples contained dieldrin at or <br /> new community of Mountain House. Rural resi- above safe screening levels. Dieldrin was widely <br /> dential properties are south of the site along used for agricultural pest control between the <br /> Grant Line Road, and agricultural properties are 1950's and 1970's and is no longer in use. <br /> north, east and west of the site. Explanation of a RAW <br /> Since the early 1950s, it has been used for grow- The goal of the draft RAW is to summarize pre- <br /> ing feed crops, primarily oat hay and alfalfa. Two vious studies and to identify a cleanup alterna- <br /> irrigation canals cross the property. The site itself tive which prevents or reduces potential risks to <br /> was never irrigated and gently slopes from public health and the environment. Cleanup al- <br /> southwest to northeast. Groundwater is approxi- ternatives are screened and evaluated, and the <br /> mately 40 feet below ground surface. The site is draft RAW then identifies the alternative DTSC <br /> currently undeveloped and the two canals are no recommends and believes is the most appropri- <br /> longer in use. ate for the site. <br /> Previous Site Investigations Before DTSC makes a final decision to approve, <br /> modify, or deny a draft RAW, it is made avail- <br /> From 2004 to 2007, several environmental inves- able for public comment during a 30-day public <br /> tigations were conducted to determine if agricul- comment period. All comments are reviewed <br /> tural operations resulted in contamination at the and considered before the draft RAW is ap- <br /> site. The investigations included soil sampling proved. <br /> and analysis for pesticides and metals. <br /> Results showed that while metals were not ele- <br /> vated above safe levels, the pesticide dieldrin <br /> was present in low to moderate concentrations in <br /> surface soil from past agricultural practices. Diel- <br /> s <br />