SU0004098 - Laserfiche WebLink

Home Browse Search

The parcels have a General Plan designation of A/G (General Agriculture) and are zoned AG-40 (General Agriculture-40 acre minimum). 1:b. Groundwater: The applicant states that the quarry operations will require water for dust control, aggregate processing, concrete production and truck washing. This water will be supplied from on-site wells and pumps. The total recycled water requirement for the quarry is estimated to be approximately 1.5 million gallons per day. The estimated fresh water consumption by the quarry is expected to be approximately 380,000 gallons per day. The average groundwater level is located at the elevation of 75 feet above mean sea level (AMSC), or about 95 feet below the existing ground surface of the southern portion of the site, and between 70 and 83 feet in the northern portion. According to the applicant, aggregate reserves are found both above and below this elevation. Resource extraction will take place below the groundwater level. Dewatering of the active mine phase will be used to complete mineral excavation by moving water seeping into the active area into the South Pit once completed. The final reclamation plan also proposes a "potential water storage pond for agricultural use" (or to be backfilled with improved native overburden and soil). Resource extraction below the groundwater level may have a potentially significant impact on existing groundwater levels for adjacent properties. 1.c. Storm Drainage: The quarry site lies within a topographically flat area that has historically been farmed. On-site storm drainage will be retained in the lake and settling ponds. Erosion or runoff control measures will be implemented near processing facilities to prevent off-site sedimentation. As a result, storm drainage run-off impacts are expected to be less than significant. 2.a. Soils: There are three soil mapping units identified on the project site. The majority of the site is mapped as El Soyo clay loam. The northern portion of the project site contains Zacharias gravelly clay loam. The north-eastern and southern portion of the site contains Capay clay. EI Soyo clay loam is very deep, well drained, nearly level soil on alluvial fans, formed in alluvium derived from sedimentary rock sources. Capay clay is very deep, moderately drained, and nearly level soil in interfan basins, formed in alluvium derived from mixed rock sources. The Zacharias soils are deep, well drained soil that are developed on nearly level surfaces underlain by alluvial sediment deposits. The applicant is proposing to seed all areas where finished grade has been achieved with grass or vegetation, and to mulch those areas so that all erosion and sediment will be controlled. The project site is not considered to have potentially hazardous geologic or soil conditions that will significantly impact adjacent properties by causing slides or erosion. 2.b. Grading: The quarry will involve sequential excavation and backfilling operations. The quarry will be excavated with temporary side slopes of/<:1 (3/4 horizontal to 1 vertical) and will