This area is mostly used as a homeless camp, lol, really. Behind the homeless camp, through some razor sharp thorns and a behind a wall of poison ivy clearly from the Jurassic Period, sits the remnants of the old quarry. While the walls are shorter, they are more vertical and appear to offer some great climbing with significantly less commitment then the other climbs on the main slabs above the ball field.
Instead of hiking up from the ball field and taking the second switchback back left along the base of the main slabs, continue hiking straight along the trail to the top. After about 30 ft, head up over a small berm and into the homeless camp. Continue straight back from here to the walls. One can also follow the trail to the top and scamble to the top of the climbs and setup TR's.