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J. H. KLEINFELDER & ASSOCIATES <br /> File : PW86-2016/15 : 405 <br /> August 5, 1986 <br /> Page 2 <br /> 4 . Ground water is suspected to have a seasonal high depth of <br /> 15 feet below grade. <br /> 5 . San Joaquin County Flood Control maps indicate a ground <br /> water gradient from west to east/north east . <br /> The San Joaquin County Health Department has requested that <br /> alternative number two of the State of California Underground <br /> Storage Tank Regulations (Title 23 , Subchapter 16 of the <br /> California Administrative Code) be implemented as the monitoring <br /> method for the tank. This alternative requires soil sampling to <br /> determine whether prior leakage has occurred and the installation <br /> of ground water and vadose zone monitoring devices to provide on <br /> going detection of leaks . <br /> We recommend that your firm request a variance to eliminate <br /> vadose zone monitoring requirements for this tank. Conversations <br /> with various regulatory and technical individuals, as well as our <br /> firm' s prior experience indicate that vadose zone monitoring of <br /> high viscosity/low volatility products, such as the fuel oil <br /> being considered here , by either vapor sensing or soil pore <br /> liquid sampling are minimally effective . <br /> In lieu of vadose zone monitoring, we recommend that a <br /> sensing device/alarm be installed in the wells to continuously <br /> monitor for the presence of hydrocarbons in addition to the semi- <br /> annual sampling required by the Subchapter 16 Regulations. <br /> Continuous monitoring of the wells in conjunction with the <br /> shallow ground water conditions should provide sufficient <br /> detection capability. <br /> We have not included the installation of a hydrocarbon <br /> sensing device in our proposal . As a part of our final report we <br /> will provide technical assistance in the selection of an <br /> appropriate system. These systems range in price from $4 , 000 to <br /> $7 , 000 . This price would include the alarm box/control unit and <br /> appropriate sensors for the three wells. Installaion would be at <br /> additional ranging from $1 , 000 to $3 ,000 . <br /> We feel our proposed scope of work is technically adequate <br /> and meets all regulatory requirements. However, we recommend <br /> that a representative of the San Joaquin County Health Departmeht <br /> review and approve our proposal before we begin work. <br />