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BruscaAssociates.com ● P.O. Box 332, Roseville, CA 95661 ● Phone (916) 677-1470 <br /> <br /> <br /> <br /> <br />November 7, 2017 <br /> <br /> <br />Buzz Oates Development and Construction Services <br />Attention: Cybil Bryant <br />555 Capitol Mall, Ninth Floor <br />Sacramento, CA 95814 <br /> <br />ADDENDUM TO SOIL GAS MONITORING WORKPLAN <br />MURPHY PARKWAY PROPERTY <br />APN 198-012-009 <br />17100 Murphy Parkway <br />Lathrop, California <br />Brusca Project No. 137-002 <br /> <br /> <br />As requested, we have prepared this Addendum to the Soil Gas Monitoring Workplan prepared <br />by our firm and dated August 10, 2017.1 This Addendum presents minor modifications to the <br />planned soil gas monitoring program at the subject property based on review comments <br />presented by the San Joaquin County Environmental Health Department (SJCEHD) via email. <br /> <br />The SJCEHD has indicated that the installation and monitoring of two new soil gas wells along <br />the westerly property margin is required. The referenced Workplan indicated a depth of ten feet <br />for the two soil gas wells. This depth was selected so that the wells would usually be above the <br />groundwater level (past groundwater data from the site indicates typical groundwater depths <br />ranging from about nine to 15 feet). As requested by the SJCEHD, the actual groundwater depth <br />the time of soil gas well installation will be determined, and the wells will be installed to a depth <br />about one to two feet above the groundwater level at that time. <br /> <br />The referenced Workplan indicated a soil gas well sampling frequency of quarterly for a period <br />of five years. As required by the SJCEHD, the sampling frequency will be increased to monthly <br />for the first year, and then will be quarterly for the remainder of the five-year period. <br /> <br />This Workplan Addendum will be submitted to the SJCEHD for review and comment prior to <br />implementing the work. If you have any questions or require additional information, please <br />contact the undersigned at (916) 677-1470. <br /> <br /> <br />1 Brusca Associates, Inc.; “Soil Gas Monitoring Workplan, Murphy Parkway Property, APN 198-012-009, 17100 <br />Murphy Parkway, Lathrop, California”; August 10, 2017.