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STATE OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL OARD— � <br /> CENTRAL VALLEY REGION =m <br /> i <br /> 3443 <br /> O ROA <br /> SACRAMENTO, <br /> 9O,CA 95827-3098RE"EIVE <br /> MAY 9 1990 <br /> 7 May 1990 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. David Ng <br /> Sunboro_Development C_orporation,__ <br /> 1307 South Mary Avenue "� `- <br /> Sunnyvale, CA 94087 <br /> APPROVAL OF MODIFICATIONS TO PROPOSED GROUND ATER QUALITY INVESTIGATION, SUNBORO <br /> DEVELOPMENT, TRACY, SAN JOAQUIN COUNTY (CASE# 3138) <br /> Per our 30 March 1990 teleconference, Lavine-Fricke, Sunboro Development <br /> Corporation's (Sunboro) consultant, submitted a revised Workplan dated 23 April <br /> 1990. The Workplan proposes to define the Extent of hydrocarbon contamination <br /> on Sunboro's property and to measure the local ground water flow gradient. <br /> Although the hydrocarbon contamination was fc and along the northern boundary and <br /> the contamination may extend offsite, the pr posed work will be confined to the <br /> Sunboro Development property. <br /> The Workplan proposes to install four 20-fo t monitoring wells on the Sunboro <br /> property. Three monitoring wells will be installed eighty feet from the north <br /> boundary and 1 monitoring well will be instal led 200 feet from the north property <br /> boundary (see attached map) . No well borinc will be completed as a monitoring <br /> well if floating product is encountered. if floating product is encountered, it <br /> should be discussed in your next report and the location(s) identified on a map. <br /> The revised Workplan to define the extent of cnsite hydrocarbon contamination and <br /> measure the local ground water flow gradient is adequate and Sunboro may proceed <br /> with the next phase of work. As agreed upon in our teleconference, please submit <br />- your information regarding the potential offsite sources of hydrocarbon'-''--- <br /> contamination to our office by 18 May 1990. If you have any questions, please <br /> contact Robert Evans at (916) 361-5672. <br /> �py Antonia K.J. Vorster <br /> Senior Engineer <br /> RAE <br /> Attachment <br /> cc: "Ms. Eleanor Ratliff, SJPHS, Stockton <br /> Mr. John Sturnman, Levine-Fricke, Emeryville <br /> Mr. Randy Hess, Adleson, Hess, Christensen & Kelly, San Jose <br />