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MOUNTAIN HOUSE MASTER PLAN 6.8.4 Other Potential Hazards Other potential hazards include agricultural lands and water wells with pesticide/herbicide residues present, abandoned gas exploration wells, and canals (see Figure 1.8: Pre-Development (1993) Site Constraints.) In the case of the agricultural lands within the boundary of Mountain House, pesticide and/or herbicide residues may be present. It is also possible that local concentrations of pesticide and/or herbicide chemicals may be present at sites where the materials have been stored or discarded over the many decades that this area has been farmed. It is also possible that additional pesticide or herbicide concentrations could build up prior to actual development of a particular area. Objective: To avoid public health and safety problems due to abandoned oil and gas wells, agricultural facilities and canals. r Objective: To protect the environment and the public health and safety of the community from the potential harmful effects of the residues of pesticides and r herbicides that may be present as a result of past agricultural activities. Policies: r a) Potential hazards existing on the site shall be identified and avoided as part of the community development. Such hazards include abandoned gas exploration wells, and agricultural facilities and canals_ b) State listed bio-accumulative pesticides that exceed soil concentration thresholds _ shall be remediated through approved procedures. Implementation: " a) Mapping of Abandoned Gas Wells. With the submittal of a Tentative Map, other than a "Preliminary" Map, the applicant shall include a map showing the approximate location of abandoned gas exploration wells or other previously recorded sources of hazardous substances on and within 500 feet of the project area, and a report on a field and records inspection so that the County can determine if the County's procedures for well abandonment and remediation have been followed. Corrective actions, such as well abandonment and soil remediation, if required, must be completed prior to recordation of a Final Map or the issuance of a building permit for the affected area, whichever occurs first. r (See Figure 1.8: Pre-Development (1993) Site Constraints). b) Site Searches/Assessments. With the submittal of Tentative Map, other than a "Preliminary" Map, the applicant shall submit a Site Assessment prepared in accordance with ASTM Standards to assess the presence of any fuel, pesticide, herbicide, or chemical residue on or under the soil that is listed on the State or Federal list of toxic materials. A component of the required site assessment shall be an investigation of the location and condition of currently used and abandoned water wells. Wells shall be retrofitted or properly abandoned prior to r CHAPTER SIX PUBLIC HEALTH AND SAFETY PAGE 6.17